Showing papers on "Sodium sulfide published in 2009"
TL;DR: In this paper, a poly(phenylene) ionomer containing merely sulfone units connecting the phenyl rings and in which each phenyl ring is monosulfonated (100% degree of sulfonation) was presented.
Abstract: This paper presents a preparation route which allows the formation of a poly(phenylene) ionomer containing merely sulfone units (−SO2−) connecting the phenyl rings and in which each phenyl ring is monosulfonated (100% degree of sulfonation). This corresponds to an ion exchange capacity (IEC) of 4.5 mequiv g−1 (equivalent weight of EW = 220 g equiv−1). The preparation succeeded in a two-step process comprising a polycondensation reaction of sulfonated difluorodiphenyl sulfone with sodium sulfide, yielding sulfonated poly(phenylene sulfide sulfone), and the subsequent oxidation to the corresponding sulfonated poly(phenylene sulfone). The polymer was characterized by elemental analysis, NMR, IR, GPC, viscosity measurement, TGA in air and in pure water vapor atmosphere, DSC at low and high temperatures, and ac impedance spectroscopy. Room temperature water absorption isotherms have been determined by equilibrating samples at different relative humidities. Under the chosen reaction conditions, polymers with mo...
151 citations
TL;DR: This work uses highly photoluminescent cadmium sulfide (CdS) quantum dots (QDs) encapsulated in an inexpensive biopolymeric chitosan matrix for latent fingermark detection.
81 citations
TL;DR: It was concluded that the peak is due to longitudinal plasmon resonance of gold nanoplates, and their origin, ex situ transformation and role in the reaction mechanisms are discussed.
Abstract: The effects of the molar ratio of sodium sulfide to chloroauric acid in the range of 0.5 to 5 and the time factor on the formation of the nanoparticles (NPs) of metallic Au, Au2S or their mixtures have been studied applying in situ and ex situ techniques (UV-Vis absorption spectroscopy, potentiometry, TEM, SPM, SERS, XPS). The products and intermediates have been compared with those for the reduction of chloroaurate with citrate ions and combinations of citrate and sulfide ions. An increase in the concentration of sulfide ions accelerates the reduction of Au(III) complexes but hinders the nucleation and growth of Au NPs, resulting in a prolonged period before the appearance of plasmon peaks. The electrochemical potential is not directly associated with the plasmon intensities, although the potential sharply decreases simultaneously with a blue shift of the near-IR peak emerging with the Na2S/HAuCl4 ratios of 0.5 to 1.5. It was concluded that the peak is due to longitudinal plasmon resonance of gold nanoplates. Au2S NPs, the nucleation of which is effectively inhibited, and probably some structures and fragments visible in TEM and AFM, including 2–5 nm Au NPs, crystallize in part outside the solutions. The evidence of partially liquid mesoscale structures comprising intermediate gold species as precursors of nanoparticles is presented, and their origin, ex situ transformation and role in the reaction mechanisms are discussed.
58 citations
TL;DR: In this article, the surface morphology of Co9S8 is characterized by close packing of ball-like particles 8-12 μm in diameter, consisting of submicrometer structures 300-400 nm in size.
Abstract: With the purpose to obtain a sulfide material for lithium and lithium-ionic thin-film batteries, cobalt sulfide Co9S8 was synthesized on an aluminum foil or stainless steel by electrolysis of aqueous solutions containing cobalt sulfate, sodium thiosulfate and sodium sulfide. The surface morphology of electrolytic Co9S8 is characterized by close packing of ball-like particles 8–12 μm in diameter, consisting of submicrometer structures 300–400 nm in size. It was found that e-Co9S8 electrodes exhibit stable behavior during 100 lithiation-delithiation cycles in a voltage range of 2.8–1.1 V, providing a discharge capacity of ∼200 mAh/g. In a lithium cell with ethylene carbonate (EC)-dimethyl carbonate (DMC)-1M LiClO4 electrolyte, a discharge capacity of the e-Co9S8-electrode was 250–450 mAh/g in a voltage range of 2.80–0.2 V. It was found that higher discharge capacities can be achieved for e-Co9S8-electrodes with a smaller active material mass.
57 citations
TL;DR: In this paper, the phase transfer reaction between benzyl chloride with sodium sulfide was investigated in a capillary-microreactor assisted by ultrasound irradiation and a rational reaction mechanism was satisfactorily developed.
Abstract: In this work, the liquid–liquid catalytic phase transfer reaction between benzyl chloride with sodium sulfide was investigated in a capillary-microreactor assisted by ultrasound irradiation. A rational reaction mechanism was satisfactorily developed. The kinetics of the multiphase reaction was studied at different phase transfer catalyst concentration, sodium sulfide concentration and aqueous-to-organic phase flow rate ratio under both silent and sonication conditions. The reaction conversion was increased with an increase in the phase transfer catalyst concentration and sodium sulfide concentration under sonication conditions more profoundly than under silent conditions. Under sonication conditions, the reaction conversion was further enhanced by increasing the aqueous-to-organic phase flow rate ratio. However, under silent condition, such effect was negligible. In addition, the reaction system was studied in a mechanically stirred batch reactor under silent and sonication conditions. The reaction conversion was enhanced by increasing the agitation speed. The reaction conversion was further enhanced by the combination of mechanical agitation and ultrasound irradiation.
48 citations
TL;DR: A novel keratinase from Bacillus subtilis that has the potential to replace sodium sulfide in the dehairing process of leather industry is reported here.
Abstract: We report here a novel keratinase from Bacillus subtilis that has the potential to replace sodium sulfide in the dehairing process of leather industry. The Protease enzyme produced at laboratory condition has been characterized for its rate of enzyme production, and the environmental influencing factors such as pH and temperature on the activity of the enzyme has also been evaluated. The enzyme produced in pilot scale has been subjected to in vitro (spectrophotometrically) as well as in vivo assay (on wet goat skin for hair removal). The organism grown in the Dye's synthetic medium at 5.3mg/ml of cell dry weight produced 548 U/ml of protease. The in vitro enzyme activity increased with temperature within a range of 25°C to 35°C and found maximum at 45°C and at pH 11. An index of dehairing comparable to the use of conventional sodium sulfide method was achieved in 7 h of its application on wet goat skin.
43 citations
TL;DR: In this article, solid-state intercalation and in situ formation of metal sulfides in the interlayer spaces of montmorillonite are a feasible synthetic route to prepare metal sulfide-montmorillonites hybrid materials with novel nanostructure and properties.
40 citations
TL;DR: In this article, the joint techniques of flotation and leaching were studied and the results indicated that an ore containing 19.01% copper could be obtained at a recovery ratio of 35.02% by using sodium sulfide and butyl xanthate flotation.
Abstract: Mexican copper ore is a mixed ore containing mainly copper oxide and some copper sulfide that responds well to flotation. The joint techniques of flotation and leaching were studied. The results indicate that an ore containing 19.01% copper could be obtained at a recovery ratio of 35.02% by using sodium sulfide and butyl xanthate flotation. Over 83.33% of the copper oxide can be recovered from the tailings by leaching in suitable conditions, such as 1 h stirring at a temperature around 25 °C with a mixing speed of 500 r/min, an H2SO4 concentration of 1.0 mol/L and a mass ratio of the ore-slurry-liquid to solid (mL/mS) of 3. The overall yield of refined ore after flotation and leaching is over 89.18% of the copper, which is much better than sole flotation or leaching. A copper product containing more than 99.9% copper was obtained by using the process: flotation-agitation leaching-solvent extraction-electro-winning.
32 citations
TL;DR: An efficient and one-pot electrochemical method for the synthesis of methylene blue based on the Michael-type reaction of electrochemically generated quinone-diimine derived from oxidation of N,N-dimethyl-p-phenylenediamine in the presence of sodium sulfide as nucleophile in aqueous solution via EC-ECECC mechanism is reported in this article.
31 citations
TL;DR: In this paper, two solar slurry photocatalytic reactors, batch reactor (BR) and batch recycle reactor with continuous supply of inert gas (BRRwCG), were developed for comparing their performance.
28 citations
TL;DR: Significantly inhibitory effects of sulfide were observed on plant photosynthesis, root carbohydrate and nitrogen synthetic reserves, and the net photosynthetic rates, soluble carbohydrate and soluble protein contents in root were reduced by 104, 71, and 49.8%, respectively, in the 0.6 mM sulfide treatment.
Abstract: The effects of organic-rich sediment and sulfide exposure on Hydrilla verticillata were investigated. The organic richness of sediment was simulated by adding sucrose into sediments, and sulfide exposure was conducted by adding sodium sulfide to plant roots. The length, biomass and density of shoot reduced in the sucrose-amended sediments, and the largest reduction occurred in the highest 1.0% addition treatment by 84.2%, 56.7% and 92.4%, respectively. However, the 0.1% addition treatment stimulated the growth of root. The effects of below-ground sulfide exposure on the physiological activities of H. verticillata were determined by adding sulfide to the below-ground tissue. Significantly inhibitory effects of sulfide were observed on plant photosynthesis, root carbohydrate and nitrogen synthetic reserves. The net photosynthetic rates, soluble carbohydrate and soluble protein contents in root were reduced by 104%, 71.8% and 49.8%, respectively, in the 0.6 mM sulfide treatment.
TL;DR: In this article, the effect of sulfide toxicity on the kinetic parameters of anaerobic organic matter removal in a UASB (up-flow sludge blanket) reactor is presented.
Abstract: The effect of sulfide toxicity on kinetic parameters of anaerobic organic matter removal in a UASB (up-flow anaerobic sludge blanket) reactor is presented. Two lab-scale UASB reactors (10.5 L) were operated continuously during 12 months. The reactors were fed with synthetic wastes prepared daily using glucose, ammonium acetate, methanol and nutrient solution. One of the reactors also received increasing concentrations of sodium sulfide. For both reactors, the flow rate of 16 L.d-1 was held constant throughout the experiment, corresponding to a hydraulic retention time of 15.6 hours. The classic model for non-competitive sulfide inhibition was applied to the experimental data for determining the overall kinetic parameter of specific substrate utilization (q) and the sulfide inhibition coefficient (Ki). The application of the kinetic parameters determined allows prediction of methanogenesis inhibition and thus the adoption of operating parameters to minimize sulfide toxicity in UASB reactors.
Patent•
13 May 2009
TL;DR: In this paper, a copper-zinc separation beneficiation method is proposed, which comprises the following steps: (1) primary grinding, that is, adopting a combined depressant comprising lime, sodium sulfide, zinc sulfate, and sodium sulfite under the condition that the size and the content of grinding particles are respectively -0.074 mm and 65 to 70 percent; (2) copper rough concentrates regrinding and concentration, selecting out high-quality copper concentrates which contain high-grade copper and silver, but low zinc by adopting single groove speed
Abstract: The invention relates to a copper-zinc separation beneficiation method which comprises the following steps: (1) primary grinding, that is, adopting a combined depressant comprising lime, sodium sulfide, zinc sulfate, and sodium sulfite under the condition that the size and the content of grinding particles are respectively -0.074 mm and 65 to 70 percent; (2) copper rough concentrates regrinding and concentration, that is, selecting out high-quality copper concentrates which contain high-grade copper and silver, but low zinc by adopting single groove speed flotation method and continually using the combined depressant constituted by lime, sodium sulfide, zinc sulfate, and sodium sulfite, so as to realize the zinc depressing and copper flotation; (3) zinc-sulfur separation, that is, using butyl xanthate as a collecting agent to float zinc, obtaining zinc-sulphur bulk concentrate, conducting pulp conditioning by adding lime so as to depress sulfur and float copper and obtain zinc concentrates and partial sulfur concentrates, conducting the iso-flotation on the tailings and further adding the butyl xanthate to conduct flotation and obtain partial sulfur concentrate. The invention has the advantages of adopting the processes of ore blending, primary grinding, copper rough concentrates regrinding and concentration, and zinc-sulphur iso-flotation technological process, thereby better solving the problem that the copper concentrates contain too much zinc or the copper content in the zinc concentrates is over standard.
TL;DR: In this paper, coal extraction experiments were conducted using a coal, containing ca. 10% ash, from the Tshikondeni mine in South Africa, and carbon precursors were recovered from the solution as a gel by precipitation with water.
TL;DR: In this paper, a stirred tank reactor with a plane gas-liquid interface was used to measure the chemical absorption rate of diluted nitrogen dioxide into sodium sulfide solution, and the absorption rates under various experimental conditions were measured and the effects of experimental conditions on nitrogen dioxide absorption rate were discussed.
Abstract: To understand the absorption mechanism of nitrogen dioxide into a sodium sulfide solution, a stirred tank reactor with a plane gas-liquid interface was used to measure the chemical absorption rate of diluted nitrogen dioxide into sodium sulfide solution. The absorption rates under various experimental conditions were measured and the effects of experimental conditions on nitrogen dioxide absorption rate were discussed. The results show that, in the range of this study, nitrogen dioxide absorption rate increases with increasing sodium sulfide concentration, nitrogen dioxide inlet concentration, and flue gas flow rate, but decreases with increasing reaction temperature and oxygen content in flue gas.
TL;DR: A combination of tetrachlorosilane (TCS) and sodium sulfide in acetonitrile is found to be an efficient thionating reagent for aromatic aldehydes in the absence of catalysis to give the corresponding thioaldehydes as trimers in good yields as discussed by the authors.
Patent•
10 Jun 2009
TL;DR: In this article, a method for recovering zinc and lead from waste electrolytic anode slime was proposed, which consists of grinding the waste anode slime first, adding the waste electrolyti anode mixture into a mixed acid solution, stirring the mixture for 2 to 4 hours at a temperature of between 20 and 60 DEG C, filtering the mixture, and taking filter residue for standby.
Abstract: The invention discloses a method for recovering zinc and lead from waste electrolytic anode slime The method comprises: grinding the waste electrolytic anode slime first, adding the waste electrolytic anode slime into a mixed acid solution, stirring the mixture for 02 to 4 hours at a temperature of between 20 and 60 DEG C, filtering the mixture, and taking filter residue for standby; and adding filtrate into an ammonia water-ammonia carbonate solution, stirring and filtering the mixture, adding sodium sulfide solid into filtrate, obtaining lead sulfide black deposit, uniformly mixing the lead sulfide deposit and solid sodium hydroxide, performing heating reaction for 40 to 50 minutes, and performing temperature reduction, waterlogging and filtration to obtain metallic lead The method has the following advantages: firstly, the method adopts wet-method technology and has low energy consumption, low cost and good labor conditions; secondly, the method adopts a method for performing oxidation reduction and precipitation in a solution to remove impurities, and avoids the complex purifying process; and thirdly, the method simultaneously recovers the zinc and the lead in the waste slime and has high recovery rate and high metal grade
Patent•
04 Nov 2009
TL;DR: In this paper, a method for high resource treatment of cyclohexanone waste saponification lye was proposed, which achieved zero emission through the treatment of a waste with another waste, completely roots up the pollution of the waste lye on the environment, and has remarkable social benefit.
Abstract: The invention relates to a method for high resource treatment of cyclohexanone waste saponification lye. The method is improvement on a method for performing zero emission treatment on waste saponification lye produced by producing cyclohexanone through cyclohexane oxidation technology. By using the method, a process is set that sodium sulfate and pulverized coal are calcined to obtain sodium sulfide and carbon dioxide flue gas on the basis of the prior art, carbon dioxide in flue gas reacts with sodium hydroxide and sodium carbonate in initial waste lye to generate sodium hydrogencarbonate, and partial moisture is evaporated in the waste lye by high-temperature heat in the flue gas. The method utilizes the joint production of the cyclohexanone waste saponification lye to obtain chemical resources with higher level such as sodium carbonate, sodium sulfide, monoprotic organic acid, clean fuel oil and the like, and has more remarkable economic benefit; the method achieves the zero emission through the treatment of a waste with another waste, completely roots up the pollution of the waste lye on the environment, and has remarkable social benefit; and waste resources are circularly utilized, so the method has low energy consumption and mature process, is suitable for the large-scale treatment on the cyclohexanone waste saponification lye, and is also used for industrialized production of the chemical resources in the waste lye.
TL;DR: In this article, the InAs(100) surface was treated with a 1M aqueous solution of sodium sulfide (Na2S) to remove a natural oxide layer from this surface with the formation of a continuous chemisorbed passivating layer.
Abstract: Treatment of the InAs(100) surface with a 1M aqueous solution of sodium sulfide (Na2S) is found to result in the removal of a natural oxide layer from this surface with the formation of a continuous chemisorbed passivating layer of sulfur atoms that are coherently bonded to indium atoms of the crystal surface. No etching of the InAs surface in the sulfide solution occurs. The passivated InAs samples are characterized by a multiple increase in the photoluminescence intensity. The sulfide layer is desorbed from the InAs surface at temperatures of ∼400°C. This leads to the formation of a clean In-stabilized (100) surface with a (4 × 2) reconstruction. A simple technique is developed using sulfide passivation for preparing atomically smooth (2 × 4) growth surfaces of the InAs(100) substrates that are suitable for molecular-beam epitaxy of highly perfect layers of compounds based on CdSe.
TL;DR: In this article, a poly(meta-aryl sulfide amide amides amide) (m-PASAA) was prepared with aromatic nucleophilic substitution reaction: by the step polycondensation of sodium sulfide(Na2S· xH2O) with 3,3′ -bis(4-diflurobenzoyl) aryl diamine between 180-202°C at atmospheric pressure.
Abstract: Poly(meta-aryl sulfide amide amide) (m-PASAA) was prepared with aromatic nucleophilic substitution reaction: by the step polycondensation of sodium sulfide(Na2S· xH2O) with 3,3′ -bis(4-diflurobenzoyl) aryl diamine between 180–202°C at atmospheric pressure. The polymers were characterized by FT-IR spectrum, 1H-NMR spectrum, 13C-NMR spectrum, X-ray diffraction, element analyzer, DSC, TGA, AFM, instron universal tester and dissolvability experiment. The intrinsic viscosity of m-PASAA was 0.41–0.46 dl/g obtained with optimum synthesis conditions. The polymers were found to have excellent thermal performance with glass transition temperature (Tg) of 233.5–277.8°C, initial degradation temperature (Td) of 447–456.7°C. They could afford flexible and strong films with tensile strengths 38.4–46.1MPa. At the same time, their solubility was much better than polyphenylene sulfide (polyphenylene sulfide scarcely dissolves in whole organic solvents under 200°C (1)).
TL;DR: In this article, the authors measured the hydrogen oxidation reaction (HOR) at high surface-area platinum/Vulcan carbon (Pt/VC) films before and after exposure to aqueous solutions of either sodium sulfide (Na 2 S) or mercaptopropionic acid (MPA, HSCH 2 CH 2 COOH) using rotating disk electrode voltammetry.
Abstract: The kinetics of the hydrogen oxidation reaction (HOR) were measured at high surface-area platinum/Vulcan carbon (Pt/VC) films before and after exposure to aqueous solutions of either sodium sulfide (Na 2 S) or mercaptopropionic acid (MPA, HSCH 2 CH 2 COOH) using rotating disk electrode (RDE) voltammetry. At 45―90% blocking of surface Pt atoms by inorganic sulfur, sulfur appears to adsorb as oligomerized sulfur (S n ). Current―potential RDE data for the HOR at Na 2 S-exposed Pt/VC films were fitted to a recently developed dual-pathway kinetics model. At a submonolayer S n coverage of surface Pt atoms, the exchange current densities for the potential-independent Tafel―Volmer pathway, or two-site HOR pathway, decrease by about 10―50-fold compared to electrochemically cleaned Pt/VC films. Exchange current densities for the single-site, potential-dependent Heyrovsky―Volmer pathway decrease by comparable factors at the same levels of sulfur exposure. The potential-range constant γ increases in the presence of adsorbed S n . The exposure of Pt/VC to aqueous solutions of MPA, an organosulfur species, results in similarly diminished HOR exchange current densities at Pt/VC, as observed for Na 2 S exposure, but yields higher values of γ. The model is sufficiently sensitive to delineate the effects of different catalyst poisons on HOR kinetics at carbon-supported nanoscopic Pt.
Patent•
19 Aug 2009
TL;DR: In this article, a depilation caustic dipping method of the lining leather of high quality pigskin shoes without using sodium sulfide and lime was proposed, which can greatly reduce the pollution of S and waste residue in waste water caused by sodium sulfides, sodium sulfhydrate and the lime in the process of traditional leather manufacturing process, and the discharge amount of the waste water is reduced by 40% and is easy to treat compared with the conventional depilation liming working procedure.
Abstract: The invention relates to a depilation caustic dipping method of the lining leather of high quality pigskin shoes without using sodium sulfide and lime, which is characterized in that the method can greatly reduce the pollution of S and waste residue in waste water caused by sodium sulfide, sodium sulfhydrate and the lime in the process of traditional leather manufacturing process, and the discharge amount of the waste water is reduced by 40% and is easy to treat compared with the conventional depilation liming working procedure. Meanwhile, a non-ammonia dealkalization method is adopted to greatly reduce the content of NH3-N in the waste water. Compared with the traditional technique, the method can shorten the production period, save materials and reduce the comprehensive cost of production.
Patent•
14 Oct 2009
TL;DR: In this article, a preparation method of manganese sulfide nano material, belonging to the inorganic nano material field, is described. But the method is not suitable for high-dimensional materials.
Abstract: The invention relates to a preparation method of manganese sulfide nano material, belonging to the inorganic nano material field. The preparation method comprises the following steps of: step 1. preparing solution a and solution b, wherein, solution a: dissolving manganese chloride in pure water, adding a modifying agent, stirring and forming solution a, solution b: dissolving sodium sulfide in pure water and forming solution b; step 2. mixing solution a and solution b in the step 1 according to the molar ratio of the manganese chloride and the sodium sulfide of 2:3; stirring, transferring the mixed solution into a high-pressure kettle containing a polyfluortetraethylene liner, reacting for 6 to 12 hours under the temperature of 120 to 180 DEG C, and naturally cooling; and step 3. washing the products obtained in the step 2 after cooling, drying thereby obtaining the manganese sulfide nano material. The method has simple and convenient operation, high yield and uniform and controllable crystal types and appearance of products and the like.
Patent•
31 Mar 2009
TL;DR: In this paper, a pollution-free production technology of direct fast black G, comprising the following implementation steps: first, primary acid coupling is carried out on nitroaniline after diazotization and H-acid; after the full reaction of the H acid is detected, sodium carbonate is added and pH is adjusted to 8 to 8.2 to carry out secondary basic coupling; the coupling product is added into a sodium sulfide solution for reduction, and the temperature gradually raises to t of 38 DEGC to 40 DEG C in the reaction process.
Abstract: The invention relates to a pollution-free production technology of direct fast black G, comprising the following implementation steps: firstly, primary acid coupling is carried out on nitroaniline after diazotization and H-acid; after the full reaction of the H-acid is detected, sodium carbonate is added and pH is adjusted to 8 to 8.2 to carry out secondary basic coupling; the coupling product is added into a sodium sulfide solution for reduction, and the temperature gradually raises to t of 38 DEG C to 40 DEG C in the reaction process; after the sodium carbonate is added into the reduction product after acidification to adjust the pH of a medium to 7.5 to 8, the mixture is adsorbed by activated carbon and filtered, and ternary coupling is carried out on the obtained filter liquor after diazotization and lentine; and after the reaction is detected to be end point, the materials are directly delivered to a drying tower for spray drying. In the invention, the reduced reaction solution does not need the processes of salting out, acidification and filtration, activated carbon adsorption is adopted instead. In the process, no waste liquor is generated, and environment pollution caused in the production process of dye is greatly reduced. Simultaneously, wastewater processing is not needed, and the cost is saved. The optimized technology directly transfers the reaction solution after ternary coupling into the drying tower for spray drying; and the yield and the coloring intensity of the dye are effectively increased, energy is saved, the consumption is reduced, and the effect is obvious.
Patent•
21 Oct 2009
TL;DR: In this article, a method of recycling cyclohexanone waste lye was proposed, where acid neutralization was used for neutralizing lye to extract acid oil, anhydrous sodium sulfate and sodium sulphate with water for cogeneration of sodium sulfide, and acid oil was used to cogenerate monocarboxylie acid, adipate and fuel oil.
Abstract: The invention relates to a method of recycling cyclohexanone waste lye. The method comprises the following steps: 1) acid is used for neutralizing waste lye to extract acid oil, anhydrous sodium sulphate and sodium sulphate with water; acidulated sewage is processed; 2) acidic sour gas is processed; 3) anhydrous sodium sulphate and sodium sulphate with water are used for cogeneration of sodium sulfide; 4) acid oil is used for cogeneration of monocarboxylie acid, adipate and fuel oil. The technical route is reasonable and has the advantages that waste lye is used for processing the sewage acidulated by sodium sulfate solution immediately after neutralization with acid to eliminate acidic sour gas, so as to radically treat secondary pollution of acid neutralization method, achieve zero emission and improve environmental benefits obviously; sodium sulfide, monocarboxylie acid, adipate, clean fuel oil and other chemical products with high added-value are obtained, so that economic benefits are obvious; The method recycles waste resource, has low energy consumption and simple technique, which is applicable to scale treatment of cyclohexanone waste lye as well as industrial production of resource recovery.
Patent•
02 Sep 2009
TL;DR: In this article, a method for separating cellulose from straws and getting cellulose solution is characterized in that the straws are dipped into inorganic acid of 2-8 mol/L to enable the hemicellulose desorption ratio to reach over 85wt percent.
Abstract: The invention discloses a method for separating cellulose from straws and getting cellulose solution, which is characterized in that the straws are dipped into inorganic acid of 2-8 mol/L to enable the hemicellulose desorption ratio to reach over 85wt percent, then the straw residues for desorbing hemicelluloses are added in water solution containing 20-30wt percent of polyoxyalkylene and 12-13wt percent of sodium hydroxide, sodium sulfide and sodium carbonate with the mol ratio of 0.5-1.5:0.2-1.0:0.1-0.3 and extracted till the lignin desorption ratio is larger than 80wt percent; every 3-4g of got cellulose is added into 6-10wt percent of sodium hydroxide containing 0-100ml or 4-10wt percent of lithium hydroxide, and 4-15wt percent of carbamide or thiourea solution to realize that the straws are directly prepared into the cellulose solution through precooling at low temperature, melting and stirring. The method can be used for cellulose spanning, regeneration membrane and resin manufacture and chemical derivation reaction.
Patent•
16 Sep 2009
TL;DR: In this paper, the floatation separation process adopts bi-hydroxyethyl group amino sodium formate as the inhibitor of the bismuth sulfide mineral, and the method of the invention efficiently overcomes the defects of large use amount of common sodium sulfide, bad operation environment and heavy pollution.
Abstract: A method for separating molybdenum and bismuth sulfide collective concentrate minerals relates to a mineral separation process, in particular to a method for separating the molybdenum and bismuth sulfide collective concentrate minerals to obtain molybdenum concentrate and bismuth concentrate. The invention is characterized in that the floatation separation process adopts bi-hydroxyethyl group amino sodium formate or bi-hydroxyethyl group amino potassium formate as the inhibitor of the bismuth sulfide mineral. The method of the invention efficiently overcomes the defects of large use amount ofcommon sodium sulfide, bad operation environment and heavy pollution, and has the characteristics of convenient adding, safe usage and the like. The invention provides an effective method featuring small medicament use amount, convenient usage and little environment pollution for the separation of molybdenum and bismuth sulfide minerals.
Patent•
08 Apr 2009
TL;DR: In this article, an aromatic heterocyclic polyphenylene sulfide copolymer and a preparation method, applications and products thereof are described, which is particularly applicable to prepare membranes and fiber and can improve tenacity and intensity.
Abstract: The invention discloses an aromatic heterocyclic polyphenylene sulfide copolymer and a preparation method, applications and products thereof. In the copolymer, -HAr-S- structure is embedded into -Ar-S molecular structure to form -Ar-S-HAr-S- structure; the preparation method thereof is that sodium sulfide, paradichlorobenzene and 2-(4-chloro-phenyl)-5-chloro-benzimadazole are taken as raw materials, N-methyl-2-pyrrolidone is taken as a solvent, condensation polymerization synthesis is carried out under the function of alkali metal assistant solvent to blend with polyphenylene sulfide so as to prepare various injection molding or plastic extruding products. The aromatic heterocyclic polyphenylene sulfide copolymer is particularly applicable to prepare membranes and fiber and can improve tenacity and intensity.
Patent•
06 May 2009
TL;DR: In this paper, a bridged dipyrene-3,4,6,7-12, 13, 15, 16-octcarboxylic acid tetraimide compound containing sulphur atoms or selenium atoms was obtained through column chromatography separation.
Abstract: The invention relates to a bridged dipyrene-3,4,6,7-12, 13, 15, 16-octcarboxylic acid tetraimide compound containing sulphur atoms or selenium atoms and a preparation method thereof. 1,6, 7,12-tetrahalogenated pyrene-3,4-9,10-tetracarboxylic acid diimide compound or 1,9,10,18-tetrahalogenated dipyrene-3,4,6,7-12, 13, 15, 16-octcarboxylic acid tetraimide compound, sodium sulfide or sodium selenide, a catalyst, an amino acid ligand and inorganic base are mixed; then an organic solvent is added; the reaction is carried out under the protection of inert gas; the product is dissolved in the solvent, is washed in sodium chloride aqueous solution, and is dried and filtrated; then the solvent is distilled to dryness; and the bridged dipyrene-3,4,6,7-12, 13, 15, 16-octcarboxylic acid tetraimide compound containing sulphur atoms or selenium atoms in the lateral position showed by formula(I) or (II) is obtained through column chromatography separation. The yield after purification is 10 to 40 percent.
Patent•
30 Dec 2009
TL;DR: In this paper, a method for preparing a bismuth sulfide nano-rod crystalline material, wherein the method is suitable for preparing nano-crystalline materials of Bismuth and other sulfides, is described.
Abstract: The invention discloses a method for preparing a bismuth sulfide nano-rod crystalline material, wherein the method is suitable for preparing nano-crystalline materials of bismuth sulfide and other sulfides. The method is characterized in that molten compound nitrate solvent is utilized; the crystalline material is synthesized through chemical reaction under normal pressure and at a temperature of 100-300 DEG C; raw materials used in the method include soluble inorganic metal bismuth salt and sodium sulfide or sulfur powder; the cost during the synthesis is simple; various parameters in the reaction process are easy to monitor and control; little environment pollution is caused; a reaction system has good uniformity; the process is simple and the production can be easily expanded; obtained bismuth sulfide realizes good crystallization, clean surface and uniform size and is suitable for conducting researches on intrinsic properties thereof and bringing the functions of nano-crystalline materials into maximum play.