Showing papers on "Sodium sulfite published in 2007"

Oxidation inhibition of sulfite in dual alkali flue gas desulfurization system.

Abstract: A laboratory-scale well-mixed thermostatic reactor with continuously blasting air was used to investigate the oxidation inhibition of sulfite in dual alkali flue gas desulfurization (FGD) system. The effects of operating parameters such as pH value and catalyst concentration on the oxidation were studied. Sodium thiosulfate was used in the system, and was found that it significantly inhabited the sulfite oxidation. In the absence of catalyst, sodium thiosulfate at 12.67 mmol/L had an inhibition efficiency of approximately 98%. While in the presence of catalyst, sodium thiosulfate at 26.72 mmol/L had an inhibition efficiency less than 85.0%. The oxidation reaction order of sulfite in the sodium thiosulfate was determined to be -1.90 and -0.55 in the absence and presence of the catalyst, respectively. Apparent activation energy of oxidation inhibition was calculated to be 53.9 kJ/mol. Pilot tests showed that the consumption rate of thiosulfate agreed well with the laboratory-scale experimental results.

Sodium metabisulfite--a marker for cosmetic allergy?

Abstract: A 45-year-old woman developed dermatitis of the face after she applied a cosmetic package comprising day and night creams. Patch tests were performed with the British Contact Dermatitis Society (BCDS) standard, bases + preservatives, and cosmetic series in addition to samples of both creams and the individual constituents. She had positive tests to both cosmetic creams, sodium sulfite from the manufacturer's samples (5% white soft paraffin (WSP)), and sodium metabisulfite (1% pet) in our bases + preservatives battery. Sodium sulfite is a constituent of both cosmetic creams. We assume that the positive test to sodium metabisulfite is a cross-reaction. We hypothesize that a reaction to sodium metabisulfite may be a marker for sulfite allergy in cosmetics and might account for some of the unexplained positives in previous reports.

Compound decarburization solution for recovering carbon dioxide in gas mixture

Abstract: The invention belongs to the gas separation technology area, it relates to a decarbonization solution which recycles or removes the carbon dioxide gas from the mixed gas which contains carbon dioxide, said invention specially relates to an ethoxyl ethylenediamine decarbonization solution. Its characteristic lies in: the invention has designed a new compound decarbonization solution which is composed of the main absorption component, the aid absorption component, the activation component, the corrosion inhibitor, the oxidation inhibitor and the water. Among, the main absorption component is AEE, the aid absorption component is AMP, MDEA and TEA, the activation component is MEA, DEA and PZ, the corrosion inhibitor is vitriol sour sodium, the oxidation inhibitor is the sodium sulfite and the cupric acetate. The effect and the profit of the invention are that it can be used in recycling many kinds of chemical industry reaction exhaust, the carbon dioxide of the combustion flue gas and the mixed gas, may also used in removing the carbon dioxide of town gas, the natural gas and so on, the merit of the decarbonization fluid is that the absorption capacity is big, purification is high, desorption rate is big, regeneration energy consumption is low.

Pretreatment method for sulfate radical removal from salt water by membrane process

Abstract: The invention discloses a preconditioning method to strip sulfate ion of salt water with membrane process, which comprises the following steps: (1) fetching salt water from ionic membrane caustic soda system antichloration tower; adding into sodium sulfite; stripping survival free chloride; (2) adjusting pH value of the salt water at 3-7; adjusting temperature at 35-50 degc; (3) filtering with activated char to avoid chloride ion entering into barrier separation device; (4) stripping particle activated char generating by reacting activated char and free chloride with security filter; separating sulfate ion with film separating device

Compound and its processing technology for compound sulfamonomethoxine sodium injection

Abstract: The present invention discloses a formula of a daimeton sodium injection and making process thereof, and aims at providing a formula of compound recipe formulation compound recipe daimeton sodium injection capable of preventing and curing mixing infection contamination of a plurality of virus, bacilli, mycoplasma and bloodworm and making process thereof. Said formula and making process are characterized in that the formula is as follows: daimeton sodium of150g, trimethoprim of 30g, ofloxacin of 20g, dexamethasone sodium phosphate of 1g, propylene glycol of 600ml, ethanol amine of right amount, benzenemethanol of 40ml, ethylenediamine tetraacetic acid disodium of 100mg, anhydrous sodium sulfite of 2g, active carbon of 3g, and water for injection of added to 1000ml; the organic combination of daimeton sodium, trimethoprim, ofloxacin, dexamethasone sodium phosphate together can effectively exhibits effects of medicament cooperation, synergism and long acting, and improves medicament curative effects, expands antibacterial spectrum, improves medicament side-effects, can achieve the objective of one injection for effect onset and 3-5 injection for healing; wrapping material is saved to reduce the cost of products.

Wet process complex denitration technique enhancing Fe*EDTA by using sulfite reducing agent

Abstract: The invention discloses a wet complex denitrification process used sulfite for reductant enhance FeIIEDTA, pending gas absorption into the flue gas reactor, and contain sulfite and FeIIEDTA compounds mixed absorption of the full contact, the NOx, SO2 in the flue gas purification after absorption and to be let, the invention of the sulfite as a reductant using sodium sulfite, or mixtures of magnesium sulfate. The invention improve the efficiency FeIIEDTA denitrification, only a absorbing devices can achieve a better purification efficiency, structure simple, operation convenient, covering small. Using this invention Process for flue gas can reach 65 to 95% of the nitrogen oxide removal efficiency.

Method for preparing chitose magnetic microsphere metal palladium complex catalyst

Abstract: The invention discloses a making method of chitosan magnet-microball metal palladium complex catalyst, which comprises the following steps: (1) weighing certain quantity of ferric chloride solution through original reducing method; adding certain quantity of sodium sulfite solution; stirring protected by nitrogen; adding sodium hydroxide to react for 1-2h; adding acetic acid solution of chitose; stirring at high speed to finish reacting; obtaining black chitosan magnet-microball; (2) weighing quantitative chitosan magnet-microball in the flask; adding metal palladium salt and anhydrous alcohol; stirring; heating; refluxing to react 10h under 90-120 deg.c; washing through anhydrous alcohol; sucking; drying; obtaining the product.

Method for rapid detecting chemical fertillizers effective phosphorus content

Abstract: The invention discloses a rapid testing method of effective phosphor content of fertilizer, which comprises the following steps: allocating several parts of potassium dihydrogenphosphate solution with varied density of P2O5 sequently as standard solution; adding ammonium molybdate solution, hydroquinone and sodium sulfite powder-shaped solid in each standard solution; obtaining the known effective phosphor content and the contrast liquid of each standard with color; adding EDTA in the solution of fertilizer sample as extractor; extracting soluble and citrate-solving phosphor together in the fertilizer; diluting and adding nitric acid solution; obtaining the disposing liquid of sample; adding ammonium molybdate solution, hydroquinone and sodium sulfite powder-shaped solid in the sample; obtaining the contrast liquid of sample with color; comparing the color of contrast liquid and the color of each contrast liquid of standard sample; obtaining the effective phosphor content of the detected fertilizer. The invention realizes the rapid phosphor content detection, which is fit for rapid on-site detection for non-professional person.

Mass transfer and kinetics study on the sulfite forced oxidation with manganese ion catalyst

Abstract: Wet limestone scrubbing is the most common flue gas desulfurization process (FGD) for control of sulfur dioxide emissions from the combustion of fossil fuels. Forced oxidation, which controls the overall reaction of the sulfur dioxide absorption, is the key path of the process. Manganese which comes from the coal is one of the catalysts during the forced oxidation process. In the present work, the two-film theory was used to analyze the sulfite forced oxidation reaction with an image boundary recognition technique, and the oxidation rate was experimentally studied by contacting pure oxygen with a sodium sulfite solution. There was a critical sulfite concentration 0.328 mol/L without catalyst or at a constant catalyst concentration value. The kinetics study focused on the active energy of the reaction and the reaction constant k; furthermore, we obtained the order with respect to the sulfite and Mn2+ concentrations. When the Mn2+ catalyst concentration was kept unchanged, the sulfite oxidation reaction rate was controlled by dual film and the reaction kinetics was first order with respect to sulfite while SO 3 2− concentration was below 0.328 mol/L; the sulfite oxidation reaction rate was controlled by gas film only and the reaction kinetics was zero order with respect to sulfite while SO 3 2− concentration over 0.328 mol/L. When SO 3 2− concentration was kept unchanged, the sulfite oxidation reaction rate depended on gas-liquid mass transfer and the reaction kinetics was different in various stages with respect to Mn2+ concentrations.

Cyanide-free electrolytic gold plating bath for bump formation, and method for forming bump

Abstract: PROBLEM TO BE SOLVED: To provide a cyanide-free electrolytic gold plating bath for bump formation which can obtain a gold bump with bump hardness and shape suitable for joining with a substrate electrode subjected to tinning or gold plating. SOLUTION: The cyanide-free electrolytic gold plating bath for bump formation comprises: the alkaline salt of gold sulfite or ammonium gold sulfite as a gold source; water soluble amine as a stabilizer for a plating bath; a crystal regulator; a conductive salt composed of sodium sulfite by 5 to 150 g/L; a buffer; and polyalkylene glycol with a molecular weight of 2,000 to 6,000 by 0.01 to 10 mg/L. As the crystal regulator, a Tl compound, a Pb compound or an As compound is preferable, and, as the water soluble amine, a 2 to 6C diamine compound is preferable. COPYRIGHT: (C)2009,JPO&INPIT

Heterocyclization of N-Hetaryl-N′-(prop-2-en-1-yl)thioureas by the action of sulfuryl chloride

Abstract: Cyclization of N-hetaryl-N′-(prop-2-en-1-yl)thioureas by the action of sulfuryl chloride leads to the formation of the corresponding 2-hetarylimino-5-chloromethylthiazolidine hydrochlorides which are converted into the free bases by treatment with aqueous sodium sulfite.

Chemical process for removing oxidizing layer of stainless steel

Abstract: This invention discloses a chemical method for removing stainless steel oxide layer. The method comprises: soaking 2205 bi-phase stainless steel belt in an acid-washing pool filled with acid-washing solution. The acid-washing solution comprises: sulfuric acid 230-260 g/L, sodium sulfite 60-100 g/L, sodium chloride 40-60 g/L, sodium nitrate 15-30 g/L, sodium borofluoride 50-80 g/L, thiourea 4-8 g/L, oxalic acid 60-100 g/L, and water as balance. The temperature of the acid-washing solution is 50-70 deg.C. The soaking time of 2205 bi-phase stainless steel belt in the acid-washing pool is 40-60 min. The acid-washing solution is stirrer by aeration during the acid washing process. The method is especially suitable for acid-washing 2205 bi-phase stainless steel belt.

Method for purifying golden and silver by fast wetting optimization

Abstract: A fast method for purifying gold and silver by optimization wetting method is carried out by taking gold-contained supernatant at room-temperature, putting it into reactor, adding into anhydrous sodium sulfite while agitating, depositing, filtering and washing by boiled water. It's fast, safe, cheap and non-toxic and has better gold purity, recovery rate and no environmental pollution.

Method for producing 3-chloro-2-hydroxypropanesulfonic acid sodium salt

Abstract: The present invention discloses sodium 3-chloro-2-hydroxypropyl sulfonate preparing process, and is especially one condensation reaction process of epoxy chloropropane and sodium bisulfite materials in water solution and in the presence of catalyst to prepare sodium 3-chloro-2-hydroxypropyl sulfonate. The catalyst is one mixture of sodium sulfite and complexing agent, which is one selected from EDTA, citric acid, diethylene triamine pentacetic acid, malic acid, maleic acid, succinic acid and their salts. The process can avoid the generation of flocculate in the solution and eliminate free iron ion effectively and has shortened reaction period.

A repair method used with water expandable acrylic resin for water leaks on concrete construction

Abstract: A water-expandable acrylic resin grout composition is provided to ensure excellent durability because an antifungal property, saline resistance, and freezing and thawing resistance are reinforced with additives. A water-expandable acrylic resin grout composition is obtained by mixing a first solution with a second solution in a weight ratio of 1:1. The first solution comprises 23-28.5wt% of a water-soluble inorganic salt obtained by mixing sodium hydroxide with potassium hydroxide in a molar ratio of 1:1, 12.3-21.5wt% of an acidic monomer obtained by mixing acrylic acid with methacrylic acid in a molar ratio of 1:1, 7.2-8.9wt% of acrylic amide as a water-soluble monomer, 0.9-2.0wt% of ethyleneglycol di(meth)acrylate as a cross-linking agent, 0.7-1.5wt% of sodium sulfite as a reductant, and the balance of deionized water. The second solution comprises 76-90wt% of deionized water containing one silane compound selected from the group consisting of CH3Si(OCH3)3, CH3Si(OC2H5)3, and (CH3)2Si(OCH3)2, 5-10wt% of ammonium persulfate as an oxidant, 1-5wt% of polypropylene glycol as an anti-freezer, and 1-9wt% of a non-reactive organic polysiloxane-polyoxyalkylene copolymer represented by the following formula 1 as an antifungal agent.

Evaluation of antioxidants using oxidation reaction rate constants

Abstract: An evaluation method for the capacity of antioxidants to protect drugs against oxidation is presented. As a new viewpoint, to determine the priority of the competitive oxidations between the antioxidant and the protected drug, and to compare the drug-protection capacity of antioxidants, it is important to determine their oxidation rate constants using chemical kinetics instead of standard oxidation (or reduction) potentials. Sodium sulfite, sodium bisulfite and sodium pyrosulfite were used as models for the determination of oxidation reaction rate constants in aqueous solutions. In the experiments, sufficient air was continually infused into the solution to keep the concentration of dissolved oxygen constant. The residual concentrations of the antioxidants were determined by iodimetry, and the concentration of dissolved oxygen by oxygen electrode. The data were fitted by linear regressions to obtain the reaction rate constants. It was found that the degradation of sodium sulfite, sodium bisulfite or sodium pyrosulfite obeyed pseudo zero-order kinetics in the buffer solutions. Because of the ionization equilibrium, these three antioxidants have the same ion form in solutions at a definite pH value and therefore their apparent rate constants were essentially the same. The average apparent rate constants of the three antioxidants at 25°C are (1.34 ± 0.03) × 10−3 at pH 6.8, (1.20 ± 0.02) × 10−3 at pH 4.0 and (6.58 ± 0.02) × 10−3 mol·L−1·h−1 at pH 9.2, respectively.

New method of producing sodium sulfite and sodium sulfide using alkali sulfide reduction waste water

Abstract: The present invention relates to a new method for producing sodium sulfite and sodium sulfide by using sulfur alkali reduced waste water. Said method includes the following steps: using sulfur alkali reduced waste water as mother liquor, vacuum evaporating mother liquor water, vacuum concentrating desalted or saltless mother liquor water to obtain the mixture of sodium sulfite and sodium sulfide; preparing saturated solution of said mixture; using active carbon to make adsorption and decolouring, press-filtering and removing residue; further vacuum evaporating said saturated solution whose residue is removed so as to obtain white anhydrous sodium sulfite; heating concentrating or evaporating the residual solution so as to obtain sodium sulfide.

Preparation method of sulphonating succinate ester disodium salt combined leather currying agent

Abstract: The invention provides a sulfonated succinate disodium salt combination type leather greasing agent preparing method. It includes the following steps: using lanonol contains hydroxyl, special colza oil fat acyl diethanolamine and castor oil as material; forming butene diacid monoester; sulfonation by anhydrous sodium sulfite. The out look of the greasing agent is faint yellow ointment shape. It will not stratify for six months while storing at room temperature, 1:9 water miscible liquid for 24h without floating oil. The produced greasing leather has the advantages of flattening, smooth surface, and good light fastness.

Active pulp-making agent for paper making

Abstract: This invention involves a papermaking active pulp making, belongs to the papermaking technology It is composed by the active ingredient, the host medicinal preparation and the auxiliary medicinal The active ingredient components is: propyl butyl-carbinol polyethyleneoxide ether, oxidized polyethylene emulsion, ethyl alcohol, lauryl benzene sulfonic acid sodium, sodium monoperoxy, alkalinity proteinase and talcum powder; The main medicinal preparation's components is: calcium hydroxide, anthraquinone, sodium monoperoxy, lauryl benzene sulfonic acid sodium, anhydrous sodium sulfite and talcum powder; The auxiliary medicinal preparation's ingredient is: alkalinity proteinase, sodium monoperoxy and talcum powder; Mix the active ingredient, the host medicinal preparation and the auxiliary medicinal preparation This invention's papermaking active system paste, may not use the alkali, does not need the massive laundering, has avoided the sewage emissions, greatly economize on water Its thick liquid rate compares with the strong alkali method, may enhance 20% The use of industrial chemicals is greatly reduced, and so on

Process for reclaiming lactoalbumin from waste liquid of casein industrial production

Abstract: The invention relates to a method for recycling lactalbumin from waste liquid of dry casein production, wherein it comprises that: in the waste solution with more than 1. 1% protein, adding sodium sulfite and sodium sulfite to protect color, adjusting pH value and filtering; disinfecting at high temperature for short time and removing smell; entering into screw membrane to be filtered; condensing into 1/3 amount; entering into vacuum condenser to be condensed into 30-45% lactalbumin content; atomizing and drying the condensed liquid, to obtain the lactalbumin powder. The invention has high efficiency and simple process.

Method for recovering silver from low silver contained industrial waste water

Abstract: One process of recovering silver from silver-containing industrial waste water includes the following steps: adding Pb grain into the industrial waste water and stirring for 1 hr to react said replace partial Ag; eliminating unreacted Pb grain and adding iodide salt to convert Ag into insoluble silver iodide; adding iodide into sodium sulfide solution via stirring to obtain silver sulfide precipitate for recovery and converting iodine into sodium iodide for reuse One other process includes the following steps: adding potassium iodide or sodium iodide into the industrial waste water to obtain silver iodide precipitate and adding sodium sulfite simultaneously to raise the silver precipitating efficiency; and adding the silver iodide into sodium sulfide solution The former is suitable for industrial waste water with lower silver content of 8-40 mg/L, and the later for that with silver content of 40-270 mg/L The processes are low in cost and simple in operation

Removing agent of remaining concrete at form

Abstract: A removing agent of residual concrete in a form is provided to clearly eliminate the concrete remaining in the form without the surface damage of the form. The removing agent of the residual concrete in a form consists of 10~70wt.% of an oxidant, 0.1~30wt.% of an oxidation auxiliary agent, 0.5~25wt.% of a prooxidant, and the residual water. The oxidant is at least one selected from sulphuric acid, nitric acid, hydrochloric acid, phosphoric acid, sulfanilamide, carbonic acid, hypophosphite, and boric acid. The oxidation auxiliary agent is at least one selected from sodium hypochlorite, potassium permanganate, and hydrogen peroxide. The prooxidant is at least one chosen from sodium sulfate, sodium sulfite, sodium nitrate, sodium nitrite, monosodium phosphate, and disodium phosphate.

Powderd injecta of compounded glycyrrhizin and preparing method

Abstract: The present invention relates to a compound glycyrrhizin powder injection preparation and its preparation method It is made up by using monoammonium salt glycyrrhizinate, cysteine L-hydrochloride, glycine, anhydrous sodium sulfite, calcium sodium egtazate sodium hydroxide solution and sterile injection water through a certain preparation process

Method for mensurating content of niobium by method of separating weights of sodium sulfite - tannic acid

Abstract: A method for determining Nb content by utilizing sodium sulfite-tannic acid separation gravimetric means includes placing precipitated niobic acid and filtering paper into original beaker after sodium sulfite-tannic acid is added, adding nitric acid and perchloric acid to destroy filtering paper, dissolving and precipitating sulphuric acid by smoking, finally carrying out ashing-burning treatment and calculating out Nb content according weighing-result.