Showing papers on "Sodium sulfide published in 1985"
TL;DR: It is shown that hydrogen sulfide is formed from L-Cysteine and that sodium sulfide could substitute for L-cysteine in the potentiation of hydrogen peroxide-induced killing of E. coli K-12.
Abstract: L-Cysteine potentiates 100-fold the hydrogen peroxide-induced killing of a growing culture of Escherichia coli K-12 (Berglin et al., J. Bacteriol. 152:81-88). In the present study it is shown that hydrogen sulfide is formed from L-cysteine and that sodium sulfide could substitute for L-cysteine in the potentiation of hydrogen peroxide-induced killing of E. coli K-12. Addition of an amino acid, L-leucine, L-valine, or L-alanine, to an L-cysteine-containing medium with a growing culture of E. coli K-12 inhibited hydrogen sulfide formation and the potentiation of hydrogen peroxide-induced killing. These amino acids did not inhibit hydrogen sulfide formation from L-cysteine by a cell extract, and they did not inhibit the potentiation by sulfide of hydrogen peroxide-induced killing. This indicated that the amino acids protected the culture from L-cysteine-potentiated, hydrogen peroxide-induced killing by inhibiting the transport of L-cysteine into the cell. The potentiation by sodium sulfide of hydrogen peroxide-induced killing was abolished by the metal ion chelator 2,2'-bipyridyl. This indicated that metal ions, in addition to sulfide, were involved in the killing. Toxic effects of hydrogen peroxide are often presumed to be mediated by hydroxyl radicals formed in iron-catalyzed reactions. It was demonstrated that iron sulfide was more efficient than ferrous iron in catalyzing the formation of hydroxyl radicals from hydrogen peroxide. It was suggested that hydrogen sulfide formed in polymicrobial infections may play an important role in the host defense by potentiating the antimicrobial effect of hydrogen peroxide produced by phagocytic cells.
68 citations
TL;DR: Observations suggest the existence of at least three distinct subclasses of so-called nitric oxide vasodilators, at least in some cases cyanide and sulfide cannot be acting by the same mechanism in their modifications of the responses to the agonists.
Abstract: Sodium nitroprusside relaxed guinea pig ileum after the segment had been submaximally contracted by either histamine or acetylcholine, intact isolated rabbit gall bladder after submaximal contraction by either acetylcholine or cholecystokinin octapeptide, and rat pulmonary artery helical strips after submaximal contraction with norepinephrine. In each of these cases the relaxation produced by nitroprusside was at least partially reversed by the subsequent addition of excess sodium cyanide. Cyanide, however, in nontoxic concentrations did not reverse the spasmolytic effects of hydroxylamine hydrochloride, sodium azide, nitroglycerin, sodium nitrite, or nitric oxide hemoglobin on guinea pig ileum, nor did cyanide alone in the same concentrations have any effect. The similar interaction between nitroprusside and cyanide on rabbit aortic strips is not dependent on the presence of an intact endothelia cell layer. Also, on rabbit aortic strips and like cyanide, sodium sulfide reversed the spasmolytic effects of azide and hydroxylamine, but it had little or no effect on the relaxation induced by papaverine. Unlike cyanide, however, sulfide augmented the relaxation induced by nitroprusside, and it reversed the effects of nitric oxide hemoglobin, nitroglycerin, and nitrite. A direct chemical reaction between sulfide and nitroprusside may account for the difference between it and cyanide. Although evidence wasmore » obtained also for a direct chemical reaction between sulfide and norepinephrine, that reaction does not seem to have played a role in these results.« less
26 citations
Patent•
10 May 1985
TL;DR: In this paper, a treatment technique for drastically reducing the volume of hazardous sludge generated by the chemical reduction of chromium contaminants and the precipitation of heavy metal contaminants from contaminated electroplating wastewater is presented.
Abstract: The present invention involves a treatment technique for drastically reducing the volume of hazardous sludge generated by the chemical reduction of chromium contaminants and the precipitation of heavy metal contaminants from contaminated electroplating wastewater. The wastewater is first adjusted to a pH of from about 8 to 10 and then treated with sodium sulfide to provide sulfide ions to effect precipitation of heavy metal contaminants followed by treatment with ferrous sulfate or ferrous chloride to provide ferrous ions to chemically reduce the hexavalent chromium to its trivalent state. This method produces approximately one-fourth the sludge generated by the previously known acidic reaction treatment using only ferrous sulfide.
25 citations
TL;DR: The Raman spectrum of selenium dissolved in an aqueous solution of sodium sulfide was measured using an YAG laser and a multiple-reflection cell, and an intense broad band was observed at 264 cm-1 as discussed by the authors.
Abstract: The Raman spectrum of selenium dissolved in an aqueous solution of sodium sulfide was measured using an YAG laser and a multiple-reflection cell, and an intense broad band was observed at 264 cm-1. This frequency is higher than those of the corresponding symmetric bond-stretclaing modes in any solid form of selenium. This is explained by considering the decrease of the interference between inter- and intramolecular bondings in the solution.
14 citations
Patent•
02 Nov 1985
TL;DR: In this article, the solid concn. of an ore solution consisting of a raw ore after grinding and water or that of a ore solution of a bulk concentrate obtained by perfoming bulk-differential flotation to the aforementioned ore solution is adjusted to 45-80wt%.
Abstract: PURPOSE:To separate a copper concentrate and a zinc concentrate excellent in a grate at good yield by flotation, by selectively controlling zinc sulfide mineral and iron sulfide mineral while floating copper sulfide mineral in a complicated sulfide ore containing sulfide minerals. CONSTITUTION:In separating a copper concentrate and a zinc concentrate from a complicated sulfide ore by differential flotation, the solid concn. of an ore solution consisting of a raw ore after grinding and water or that of an ore solution of a bulk concentrate obtained by perfoming bulk-differential flotation to the aforementioned ore solution is adjusted to 45-80wt%. Subsequently, sodium sulfide is added to said ore solution in an amount of 0.2-3kg per a ton of the ore to perform conditioning and, thereafter, zinc sulfate 1.5-3.5wt. times sodium sulfide and 1.5-10kg/ton of the ore of sulfur dioxide gas are added to said ore solution while 50Z-200m per a ton of the ore of air is blown thereinto to further perform conditioning. Thereafter, flotation agents such as a collector and a frother are added to the ore solution to separate a copper concentrate and a zinc concentrate by flotation.
11 citations
TL;DR: In this article, the condensation of coniferyl alcohol with dissolved lignins of low molecular weight (LMWL) was investigated, and the results showed that the mixture formed oligomers with only a small proportion of the reaction products characterized by molecular weights greater than about 1000.
Abstract: The condensation of coniferyl alcohol with dissolved lignins of low molecular weight (LMWL) has been investigated. In aqueous sodium hydroxide (soda), sodium hydroxide - sodium sulfide (kraft) or sodium hydroxide - anthraquinone (soda-AQ) solutions, lignin preparations were heated and molecular weight distributions of the resultant condensation products were estimated. When coniferyl alcohol dissolved in soda and kraft liquors was heated, self-condensation was observed, mainly to form oligomers with only a small proportion of the reaction products characterized by molecular weights greater than about 1000. When mixtures of LMWL and coniferyl alcohol were heated in sodium hydroxide solutions, condensation reactions occurred and progressed further with increased temperature and concentration of coniferyl alcohol. In contrast to results with sodium hydroxide solutions, heating in kraft liquors gave rise to a higher proportion of the oligomer fraction and a smaller proportion of higher molecular weig...
10 citations
TL;DR: In this article, a spectrofluorometric method was developed for the determination of common epoxides, including 1,2-epoxy-3-phenoxypropane and 1, 2-epoxyoctane, with coefficients of variation of 1.6-2.9%.
Abstract: A spectrofluorometric method has been developed for the determination of common epoxides. Epoxides in ethanol solution gave an intense blue fluorescence (lambda/sub ex/ ca. 345 nm and lambda/sub em/ ca. 440 nm), after the first reaction with aqueous sodium sulfide at 55/sup 0/C for 20 min and followed by the second reaction with taurine and o-phthalaldehyde reagents at pH 8.3. By the proposed method, 1,2-epoxy-3-phenoxypropane and 1,2-epoxyoctane can be determined in the ranges 0.05-3 nmol/100 ..mu..L and 0.1-8 nmol/100 ..mu..L, respectively, with coefficients of variation of 1.6-2.9%. Some other alkylating agents also showed fluorescence by this method. 16 references, 8 figures, 3 tables.
7 citations
TL;DR: In this paper, the Mnary system Na,S-NaOH was investigated by dlfwentlal thermal analysis, and the room-temperature phases were determined by X-ray dlffractlon data.
Abstract: The Mnary system Na,S-NaOH was Investigated by dlffwentlal thermal analysis, and the room-temperature phases were determined by X-ray dlffractlon data. This system Is a sknple eutectic system. The eutectic temperature and compodtlon are 296 f 1 OC and 0.05 mole fractlon NazS. The polymorphlc tranotormatlon In NaOH occurred at 291 OC. The lowerlng of thls transltlon from 293.1 OC, the accepted value, Is belleved to be due to reddual moisture In the NaOH. No evldence for the two compounds Na,S-NaOH and Na2S-2NaOH, reported In the Ilterature, was observed. Mlxtures of these comporttlons gave thermal arrests at eutectic and transformation temperature. X-ray dlffractlon patterns showed llnes whlch could be accounted for on the basts of known patterns for cuMc Na,S and orthorhomblc NaOH. Ltterature data for the NaOH-Na,C03 system were revlewed and employed to construct the phase dlagram. 'Thir h also a dmple eutectlc system wlth a eutectlc temperature and composltlon of 288 f 1.0 OC and 92.0 f 0.1 mol % NaOH.
7 citations
TL;DR: In this paper, it is shown that aldehydes can be readily reduced to the corresponding alcohols, while ketones, esters and even nitro compounds are all inert toward this reagent.
Abstract: Intrinsic reactivity of sodium sulfide is well controlled by impregnating it on alumina, so that aldehydes can be readily reduced to the corresponding alcohols, while ketones, esters and even nitro compounds are all inert toward this reagent.
7 citations
Patent•
14 Sep 1985
TL;DR: In this article, a triazine adduct is subjected to heating in the presence of a polymerization inhibitor and a heat medium under reduced pressure to enable inexpensive and high-yield production of the titled compound which is used as a comonomer through simple operations in a practical scale.
Abstract: PURPOSE:A specific triazine adduct, as a starting substance, is subjected to heating in the presence of a polymerization inhibitor and a heat medium under reduced pressure to enable inexpensive and high-yield production of the titled compound which is used as a comonomer through simple operations in a practical scale. CONSTITUTION:2-[ beta-( 2'-Methylimidazolyl-1' )]-ethyl-4,6-diamino-S-triazineisocyanate of formula I, which is readily obtained from acrylonitrile, 2-methylimidazole and dicyandiamide and isocyanuric acid of formula IV, is heated, preferably together with a polymerization inhibitor such as sodium sulfide and a heating medium of particles or granules such as quartz sand, under reduced pressure of 5-20mm.Hg at 180-320 deg.C for 1hr to remove compounds of formulas III and IV as by-products and obtain the objective compound of formula II. The compound of formula III removed is collected in the form of aqueous solution and recovered by distillation under reduced pressure. The alkali salt of the compound of formula IV remains in the bottom of the distiller and is recovered.
6 citations
Patent•
19 Aug 1985
TL;DR: In this paper, an electrically conductive layer composed of copper sulfide is formed on the surface or both on surface and in the interior of a high-molecular material contg.
Abstract: PURPOSE:To form a high-molecular material which is firm and has high stable electrical conductivity, by forming an electrically conductive layer composed of copper sulfide on the surface or both on the surface and in the interior of a high-molecular material contg. a mercaptobenzimidazole or thiourea compd. CONSTITUTION:An electrically conductive layer composed of copper sulfide is formed on the surface or both on the surface and in the interior of a high- molecular material contg. at least one compd. selected from among mercaptobenzimidazole, mercaptobenzothiazole and thiourea compds. Said mercaptobenzimidazole compd., etc., can be incorporated in the high-molecular compd. by blending, adsorption or immersion. The copper sulfide layer on the surface or both on the surface and in the interior of the high-molecular material can be formed by allowing a caprous ion to be adsorbed by a knitted fabric made of a polymer and treating it with a compd. capable of releasing either or both of sulfur atom and sulfur ion (e.g. sodium sulfide or sodium thiosulfate).
Patent•
12 Dec 1985
TL;DR: In this paper, a flash-crystallizer-separator unit is used to separate geothermal brine into a gaseous fraction, a liquid fraction, and a solids fraction.
Abstract: Improved apparatus and method in which brine of the geothermal and geopressured types is directed into one or more flash-crystallizer-separator units from a geothermal well. Such brine is separated into a gaseous fraction, a liquid fraction and a solids fraction. The gaseous fraction is used to provide useful work, such as driving a turbine, while the liquid and solids fractions are treated to remove the mineral values therefrom. The liquid fraction, following the mineral recovery therefrom, is directed back into the earth through an injection well. An important aspect of the invention is the injection of chemicals into one or more of the process vessels of the apparatus of the present invention. This causes additional mineral growth, such as the growth of heavy metal sulfide, in the brine. This is achieved by injecting sulfide ions into the brine, preferably in the form of sodium sulfide. The resulting brine slurry formed in the vessels can be sent to a thickener and then to a filter press for dewatering. The resulting filter cake contains the mineral values in the form of heavy metals, primarily lead, silver and zinc, and the filter cake can be sold to a smelter for extraction of the metals or the metals can be extracted on site.
Patent•
10 Apr 1985
TL;DR: In this paper, a method of recovering coopre and zinc concentrates separately from complex sulfide ores containing sulfides of copper, zinc, iron and other minerals by differential flotation is described.
Abstract: OF THE DISCLOSURE The invention envolves a method of recovering coopre and zinc concentrates separately from complex sulfide ores containing sulfides of copper, zinc, iron and other minerals by differential flotation. The method comprises adjusting to 45 - 80 wt% the concentration of solids in a mineral pulp composed of water and as-ground feed ores or a mineral pulp of the bulk concentrate of copper and zinc sulfide ores that has been obtained as a froth in the bulk differential flotation of the copper and zinc minerals present in the first mineral pulp; conditioning either mineral pulp in the presence of sodium sulfide in an amount of 0.2 - 3 kg per ton of the ore; further conditioning the mineral pulp in the presence of zinc sulfate in an amount 1.5 - 3.5 times the weight of the sodium sulfide and 1.5 - 10 kg of sulfur dioxide per ton of the ore, while blowing 50 - 200 m3 of air per ton of the ore; and subsequently adding collectors, frothers and any other flotation reagents so as to separately recover copper and zinc concentrates by flotation. The copper and zinc concentrates obtained by this method are high not only in their grade but also in their recovery.
Patent•
17 Sep 1985
TL;DR: In this article, a process for regenerating white liquor from residual kraft liquors is described, which involves reacting at least one metal oxide member selected from ferric oxide and/or titanium dioxide with a sodium carbonate product derived from a residual Kraft black liquor under vigourous oxidation condition that is near but below the eutectic temperature of the derived product and of the selected member.
Abstract: This is a process for regenerating white liquor from residual kraft liquors. The process comprises reacting at least one metal oxide member selected from ferric oxide and/or titanium dioxide with a sodium carbonate product derived from a residual kraft black liquor under vigourous oxidation condition that is near but below the eutectic temperature of the derived product and of the selected member, to form particles comprising a mixture of sodium sulfate and of at least one sodium member of the class consisting of sodium ferrite and sodium titanate, reducing the particles in solid phase by converting the sodium sulfate in the particles to sodium sulfide in the presence of a reducing gas. The reduced particles are then dissolved in an aqueous medium to form a white liquor, and to convert the sodium member into sodium hydroxide soluble in the white liquor and into an insoluble metal oxide of the selected member. The insoluble metal oxide is separated leaving the white liquor composed of dissolved sodium sulfide and sodium hydroxide in an aqueous solution.
TL;DR: A denitrifying bacterial isolate was isolated from soil initially amended with glucose, sodium sulfide, nitrous oxide (N2O) and acetylene and was able to reduce N2O in the presence of a C2H2 concentration which normally blocks theNitrous oxide reductase enzyme in the denitrification sequence.
Patent•
03 Aug 1985
TL;DR: In this paper, the authors proposed to use a specific reagent such as sodium sulfide in performing flotation of copper mineral in minearl solution to improve the separation efficiency.
Abstract: PURPOSE:To efficiently collect copper mineral as flotation mineral without involving a public nuisance generating danger or requiring incidental equipment, by using a specific reagent such as sodium sulfide in performing flotation. CONSTITUTION:When copper mineral is selectively collected from various sulfide ores according to a flotation process, sodium sulide, carbon dioxide and a zinc compound are added to minearl solution as reagents. By together using all of three kinds of reagents, minerals such as galena or sphalerite other than copper mineral are suppressed and, therefore, separation efficiency is further enhanced.
01 Jan 1985
TL;DR: In this paper, a successful method was developed for the determination of trace amounts of methylmercury in environmental samples, particularly in sediments by gas-liquid chromatography (GLC).
Abstract: A successful method was developed for the determination of trace amounts of methylmercury in environmental samples, particularly in sediments by gas-liquid chromatography (GLC). A sample of known weight was treated with ethanolic potassium hydroxide solution and extracted with dithizone-benzene solution after slightly acidification with hydrochloric acid. The methylmercury dithizonate in benzene layer was partitioned into a small portion of sodium sulfide in aqueous ethanol as bismethylmercury sulfide. The excess of sulfide ions was removed by bubbling air through the solution slightly acidified with hydrochloric acid, and then methylmercury in the solution was re-extracted into dithizone-benzene solution as methylmercuric dithizonate. Methylmercury thus obtained was measured by ECD-GLC with a column of 5% diethylene glycol succinate and 5% sodium chloride on chromosorb W. The recovery of methylmercury added to river sediments was 95.7% on the average and the detection limit was 0.5 ppb as mercury on a wet weight basis in the present method. This method was also applicable to the analyses of methylmercury in other environmental samples such as natural water, fish, etc.
Patent•
24 Dec 1985
TL;DR: In this article, a sulfurized olefin of improved solubility in lubricating oil is made by reacting sulfur monochloride with a monoolefin (e.g. isobutylene) to form an adduct which is reacted with sodium sulfide, sodium hydrosulfide, sulfur and alkyl mercaptan (in an aqueous alcohol reaction medium).
Abstract: A sulfurized olefin of improved solubility in lubricating oil is made by reacting sulfur monochloride with a monoolefin (e.g. isobutylene) to form an adduct which is reacted with sodium sulfide, sodium hydrosulfide, sulfur and alkyl mercaptan (e.g. tert-butyl mercaptan) in an aqueous alcohol reaction medium.
Patent•
11 Oct 1985
TL;DR: In this paper, arylene sulfide was used as a starting material for a polyamide polyhalo-compound in the presence of an org. amide as a polar solvent.
Abstract: PURPOSE:To attain improved dispersibility in a polymn. reaction and to improve the yield of an arylene sulfide polymer by dehydrating sodium sulfide hydrate with a prescribed metallic salt in the presence of a hydrocarbon solvent and by using the resulting composition as a starting material for the arylene sulfide polymer. CONSTITUTION:One or more kinds of metallic salts selected among metallic salts of org. sulfonic acid, lithium halides, metallic salts of org. carboxylic acid and alkali metallic salts of phosphoric acid are brought into contact with sodium sulfide hydrate in the presence of a hydrocarbon solvent to remove part of water in the hydrate. The resulting sodium sulfide composition is reacted with an aromatic polyhalo-compound in the presence of org. amide as a polar solvent to obtain an arylene sulfide polymer.
Patent•
01 Jul 1985
TL;DR: In this article, the authors proposed a method to produce high pure thallium compounds without a manufacturing process by treating liquid contg. thalium of low concn. obtained by nonferrous smelting with a sulphurizing agent.
Abstract: PURPOSE:To manufacture various kinds of high pure thallium compounds without a process manufacturing metallic thallium by treating liquid contg. thallium of low concn. obtained by nonferrous smelting with a sulphurizing agent and settling it as thallium sulfide. CONSTITUTION:Liquid contg. thallium of low concn. obtained by a smelting process is treated by using sodium sulfide and ammonium sulfide as a sulphurizing agent to settle thallium sulfide. While blowing-in air or gaseous nitrogen, thallium is dissolved in a soln. from the thallium sulfide with sulfuric acid and H2O2 and the residue is separated and removed. The dissolved-out filtrated soln. is regulated to >=9pH by an alkali such as soda and produced ppt. is separated and removed. The alkali neutralized filtrated soln. is regulated to 1.5-2.5pH by adding sulphuric acid and substituting reaction is performed by zinc powder. The produced thallium sponge is dissolved in nitric acid and nitric acid is added to the filtrated soln. after alkali neutralization to regulate pH to <=2 and, for example, thallium nitrate is crystallized.
Patent•
16 Oct 1985
TL;DR: In this paper, an arylene sulfide polymer can be produced by reacting the sodium sulfide composition with a polyhalo-aromatic compound in the presence of an organic amide polar solvent.
Abstract: PURPOSE:To obtain a sodium sulfide composition having excellent dispersibility in polymerization reaction, by contacting a specific metallic salt with hydrated sodium sulfide in the presence of a low-molecular weight arylene sulfide polymer and an organic amide polar solvent, thereby enabling the dehydration of the reactants in high efficiency. CONSTITUTION:Hydrated sodium sulfide is made to contact with one or more metallic salts selected from organic sulfonic acid metal salts, lithium halides, organic carboxylic acid metal salts, and alkli metal phosphates, in the presence of a low-molecular weight arylene sulfide polymer and an organic amide polar solvent. At least a part of the water can be removed by this process to afford a sodium sulfide composition. An arylene sulfide polymer can be produced by reacting the sodium sulfide composition with a polyhalo-aromatic compound in the presence of an organic amide polar solvent.
Patent•
25 Jan 1985
TL;DR: In this paper, an isocyanuric acid adduct of 2-vinyl-4,6-diamino-S-triazine represented by the following structural formula is described.
Abstract: Disclosed is an isocyanuric acid adduct of 2-vinyl-4,6-diamino-S-triazine represented by the following structural formula: ##STR1## This adduct is prepared by heating 2-vinyl-4,6-diamino-S-triazine and isocyanuric acid in the presence of water, preferably by using sodium sulfide as a polymerization inhibitor. This adduct is valuable as a hardening agent for an epoxy resin.
Patent•
11 Oct 1985
TL;DR: In this article, arylene sulfide polymer is obtained by de-hydrating a sodium sulfide hydrate with a prescribed metallic salt in the presence of an alcohol solvent.
Abstract: PURPOSE:To attain improved dispersibility in a polymn reaction and to improve the yield of an arylene sulfide polymer by dehydrating sodium sulfide hydrate with a prescribed metallic salt in the presence of an alcohol solvent and by using the resulting composition as a starting material for the arylene sulfide polymer CONSTITUTION:One or more kinds of metallic salts selected among metallic salts of org sulfonic acid, lithium halides, metallic salts of org carboxylic acid and alkali metallic salts of phosphoric acid are brought into contact with sodium sulfide hydrate in the presence of an alcohol solvent to remove part of water in the hydrate The resulting sodium sulfide composition is reacted with an aromatic polyhalo-compound in the presence of org amide as a polar solvent to obtain an arylene sulfide polymer
Patent•
12 Aug 1985
TL;DR: In this article, a process for depositing on a substrate a thin layer of a compound having at least one cationic component C and at least 1 anionic component A, such as zinc sulfide on the substrate is described.
Abstract: The invention relates to a process for depositing on a substrate a thin layer of a compound having at least one cationic component C and at least one anionic component A, such as zinc sulfide on the substrate is formed (11) at least two superposed ionic layers comprising said one or more cationic constituents respectively C and said one or more anionic components A by successive immersions of the substrate in a first solution (3) containing for example a salt of C as zinc sulphate and a second solution (3 ') containing for example a salt of a such as sodium sulfide, by flushing the substrate (5) between two immersions
Patent•
13 May 1985
TL;DR: In this paper, the objective compound of formula I can be produced by the addition reaction of the 2-vinyl-4,6-diamino-s-triazine of formula II with 2-phenylimidazole in the presence or absence of a solvent at 80-150 deg.C.
Abstract: NEW MATERIAL:2,4-Diamino-6-[ ( 2'-phenylimidazolyl )-ethyl ]-s-triazine of formula I . USE:Hardener for polyepoxide. PREPARATION:The objective compound of formula I can be produced by the addition reaction of the 2-vinyl-4,6-diamino-s-triazine of formula II with 2-phenylimidazole in the presence or absence of a solvent at 80-150 deg.C. The molar ratio of the 2-phenylimidazole to the compound of formula II is 0.5-3.0. If necessary, the reaction is carried out in the presence of a polymerization inhibitor (e.g. sodium sulfide, hydroquinone, etc.).
Patent•
30 Sep 1985
TL;DR: In this paper, chemical pulp is prepared from wood chips using a digestion soln, containing 18% sodium hydroxide and 1-4% urea (NH2CONH2), and replacing sodium sulfide (Na2S) to remove emission of pollutant gases, such as NaSH or mercaptan(CH3SH).
Abstract: Chemical pulp is prepared from wood chips using a digestion soln. containing 18% sodium hydroxide and 1-4% urea (NH2CONH2), and replacing sodium sulfide (Na2S) to remove emission of pollutant gases, such as NaSH or mercaptan(CH3SH). This method has a somewhat lower pulp yield, higher rupture stregth, higher tensile strength, and a higher degree of whiteness than the Kraft (or sulfate) process.
Patent•
19 Jun 1985
TL;DR: In this article, the 2-mercaptobenzimidazole was prepared by reacting o-phenylenediamide with carbon disulfide in an aqueous medium in the presence of sodium sulfide or sodium hydrosulfide.
Abstract: PURPOSE:To prepare the titled high quality compound in high yield without requiring treatment of waste water, by reacting o-phenylenediamine with carbon disulfide in an aqueous medium in the presence of sodium sulfide or sodium hydrosulfide. CONSTITUTION:In preparing 2-mercaptobenzimidazole by reacting o-phenylenediamide (OPD for short) with carbon disulfide in an aqueous medium (preferably water), the reaction is carried out in the presence of sodium sulfide or sodium hydrosulfide in a molar ratio of it to OPD of 0.5-1.5, preferably 1-1.2. Mother liquid of the reaction of sodium sulfide or sodium hydrosulfide is reusable, discharge of the mother liquid is not required, so treatment of pollution is not needed. Hydrogen sulfide prepared as a by-product is treated at the outside of the system, it contains no impurities such as organic substance, etc. and is recoverable as high-purity sodium hydrosulfide.
TL;DR: In this article, a reaction mechanism for substituted benzaldehydes with sodium hydrogensulfide in the presence of nitrobenzene, nitrosobenzenes, or azobenzene in liquid ammonia has been proposed which involves benzaldehyde anion radical.
Abstract: Reactions of substituted benzaldehydes with sodium hydrogensulfide in the presence of nitrobenzene, nitrosobenzene, or azobenzene in liquid ammonia produce the corresponding benzyl alcohols and benzamides. On the other hand, reaction of benzaldehyde with sodium sulfide produces benzyl alcohol and benzamide. A reaction mechanism has been proposed which involves benzaldehyde anion radical.
Journal Article•
TL;DR: Rats injected intraperitoneally with 0.15 mmol sodium sulfide/kg body weight showed decreased reticulocyte delta-aminolevulinic acid synthase and heme synthase activities 24 h later, and injections of heme arginate 3 h after the sulfide dose greatly stimulated the hepatic heme oxygenase activity.
Abstract: Rats injected intraperitoneally with 0.15 mmol sodium sulfide/kg body weight showed decreased reticulocyte delta-aminolevulinic acid synthase and heme synthase activities 24 h later. Liver delta-aminolevulinic acid synthase and heme oxygenase activities were also decreased at the same time. Injection of heme arginate (10 mg heme/kg body weight) intraperitoneally 3 h after the sulfide dose completely corrected the sulfide effects and greatly stimulated the hepatic heme oxygenase activity.