Showing papers on "Sodium sulfite published in 2005"

Oxidation and absorption of nitric oxide in a packed tower with sodium hypochlorite aqueous solutions

Abstract: The oxidation and absorption of nitric oxide (NO) with sodium hypochlorite aqueous (NaClO) solutions were studied to develop a two-stage chemical scrubbing system for NOx control. In the second stage, the most practical medium for NO2 absorption is sodium sulfite aqueous solution. Although a few two-stage systems have been installed, there are major gaps in developing NaClO aqueous solutions for NO oxidation in the first stage. Of particular importance is the lack of reliable information on rates of the chemical oxidation. A pilot-scale research program is initiated to evaluate the oxidation rate of NO with NaClO aqueous solutions in a packed tower. The research is directed toward obtaining the height of a transfer unit (HTU) for NO oxidation and acquiring reasonable operating conditions for the packed-bed scrubbing system. At pH 5.3, NaClO is an excellent scrubbing medium. The results are consistent with hypochlorous acid (HClO) being the oxidizing agent in the solution. The results also indicate that the liquid mass flow rate is a minor parameter that affects the NO oxidation and absorption in the scrubber. A NaClO concentration of >0.8% is crucial for high NO oxidation. © 2005 American Institute of Chemical Engineers Environ Prog, 2005

Combined Bleaching, Shrinkage Prevention, and Biopolishing of Wool Fabrics

Abstract: In earlier work, we established that alkaline hydrogen peroxide systems that include dicyandiamide, gluconic acid, and Triton X surfactant, used alone or followed by enzyme treatments, control shrinkage in wool fabrics to3.0% and 1.2%, respectively. We have perfected this system for complete shrinkage control with no loss in mechanical properties by using the same pretreatment and enzyme applied from a buffered triethanolamine solution that incorporates sodium sulfite. Fabrics treated by this method are bright white and exhibit a soft handle with a smoothed surface. Digital image analysis is used to quantify fiber projections above the fabric surface for a measurement of smoothness. A statistical analysis with a central composite design reveals the optimum concentrations of enzyme, sodium sulfite, and exposure time that maximize shrinkage control while maintaining adequate levels of tensile strength and weight loss.

Effect of Steeping with Sulfite Salts and Adjunct Acids on Corn Wet-Milling Yields and Starch Properties

Abstract: Two corn hybrids (3394 and 33R87) were steeped with three sulfite salts and five acids to test the effect of sulfur dioxide (SO2) source and acid sources on wet-milling yields and starch properties. Milling yields from each treatment were compared with a control sample that was steeped with 2,000 ppm of SO2 (using sodium metabisulfite) and 0.55% lactic acid. Sulfur dioxide sources were potassium sulfite, sodium sulfite, and ammonium sulfite; acids were acetic, hydrochloric, oxalic, phosphoric, and sulfuric. Starch yields were affected by the SO2 source and steep acids but the effects were hybrid-dependent. Different steep acids gave different starch yields when wet milled at the same pH. Among the acids tested, weak acids (lactic and acetic) tended to give higher starch yields compared with strong acids (hydrochloric, sulfuric, phosphoric, and oxalic). Some differences were observed with different sulfite salts and acids on starch pasting properties; however, there were no clear trends.

High performance water-reducing agent of sulfanilate-sulfonated acetone-formaldehyde condensate and process for making same

Abstract: The invention provides a high performance water-reducing agent of sulfanilate-sulfonated acetone-formaldehyde condensate and process for preparation, wherein the water reducing agent water, p-aminobenzene-sulfonic acid or sulfanilate, sodium sulfite or sodium metabisulfite, acetone and methyl aldehyde, or charging water-keeping component, retardation component or gas guiding component, finally obtaining the liquid product through stirring homogeneously.

Ternary polymer oil-displacing agent, and its preparing method and use

Abstract: The invention relates to a kind of ternary polymer oil displacement agent and its manufacturing method and usage. The polymer is produced by polymerizing the three constituents of a) 60-99.96% (weight) acrylamide, b) 0.006-25% (weight) methyl propylene sodium sulfonate, c) 0.01-15% (weight) N, N-dimethyl acrylamide, in which the weight percent is calculated by gross amount of the added monomer. The weigh content of sulfonation radical in the polymer is 0.5-22.7%; the constituent b), methyl propylene sodium sulfonate, is acquired by reaction of methyl allyl-chloride and sodium sulfite, with PH controlled in 8.5-10.0. The ternary polymer oil displacement agent in the invention can improve heat-resistance and salt-proof properties of oil displacement agent efficiently in oil recovery process, so it has extensive economic benefit.

Scale and corrosion inhibiting method for industrial boiler

Abstract: The scale and corrosion inhibiting method for industrial boiler includes preparing stable sodium sulfite with sodium sulfite and isoascorbic acid, adding polyepoxy succinic acid into the boiler system, adding stable sodium sulfite and maintaining the amount inside the boiler system in 2-10 mg/L to make these two kinds of green scale inhibitor and deoxidant take synergistic effect, so as to provide environment friendly, high efficiency scale and corrosion inhibiting method for industrial boiler.

Gold-plating solution

Abstract: PROBLEM TO BE SOLVED: To provide a cyanide-free gold-plating solution which makes a plated film form a superior bump shape, possess adequate adhesiveness with a substrate even after the plated film has been heat-treated, and possess adequate hardness for securing the bondability of the bump. SOLUTION: In a gold-plating solution containing sodium gold sulfite or an ethylenediamine complex thereof with a gold concentration of 5 to 20 g/L, sodium sulfite of 10 to 100 g/L and a thallium compound with a thallium concentration of 1 to 50 ppm, this gold-plating solution further includes potassium sulfite of 0.1 to 50 g/L. COPYRIGHT: (C)2007,JPO&INPIT

Grinding fluid in use for superhard abrasive grinding wheel of metal binding agent electrolyzable online, and preparation method

Abstract: The primary liquid of grinding liquid is prepared from sodium molyb date, sodium hydrogen phosphate, glycerin, triethanolamine, sodium sulfite, borax and red oil and grinding liquid is prepared by mixing primary liquid with water in mass ratio of 1:5-1:20. The preparing process includes heating water to ttemperature of 60-80 deg.c, placing abovementioned chemicals and materials in the water for mixing and dissolving to obtain solution, cooling solution to room temp for obtaining primary liquid and mixing the primary liquid with water for final product.

Method for fabrication food wrap paper and cultural paper by using corn stalk to make no chlorin bleached pulp

Abstract: A process for preparing food packing paper and cultural paper with chlorine free bleached paper pulp includes using corn straw or its pitch free ones as raw material, then cutting, dust removing, presoaking, cooking and bleaching. The cooking reagent uses ammonium sulfite and potassium sulfite or sodium sulfite as main, sulfur or sulfourea as assistant and urea as well as sodium hydroxide as buffer. The bleaching is two sections or multisection bleaching by using urea or sulfourea to protect fibre and activate hydrogen peroxide.

Process for producing white carbon black and sodium sulphite by sodium sulfate method

Abstract: Disclosed is a process for producing white carbon black and sodium sulphite by sodium sulfate method, which comprises mixing quartz sand, sodium sulfate and charcoal, charging into kiln for reaction, thus producing solid and sulfur dioxide. The preparation of white carbon black and sodium sulfite comprises, (1) dissolving the produced sodium silicate solid, filtering to obtain the sodium silicate liquid, charging sodium hydrogen sulfite into sodium silicate liquid for synthetic reaction and filtering, (2) reacting produced sulfur dioxide with one portion of the generated filter liquor, subjecting the produced sodium hydrogen sulfite into the cycle of the synthetic reaction in step (1), (3) acidifying the filtered substance in step (1), filtering, scouring, drying, (4) concentrating one portion of the filter liquor generated in step (1), drying to obtain sodium sulfite.

Nano silver-group formaldehyde eradicating-liquid and preparation method thereof

Abstract: The invention relates to a nanometer silver formaldehyde eradicating-liquid, which is formed by triethanolamine, sodium sulfite, complexon, amchlor, amylaceum, water and water-soluble colloidal silver, wherein the average diameter of water-soluble colloidal silver is 1-100nm; said eradicating-liquid can quickly disinfect bacillus coli, etc, and reduce the free formaldehyde density under 0.08mg/m3, while the virus disinfection rate is above 90%. The invention also discloses a relative preparation.

Production of soft water comprises regeneration of an ion exchanger during a regeneration phase by a regenerator solution in a reservoir, and addition of a sodium chloride and sodium sulfite to the solution

Abstract: The reservoir (12) is connected with the ion exchanger (10), which is transferred in regular time intervals with the sodium chloride (1-5 g/l) (18), and introduced a T-piece of a regenerator line (22) in the regenerator solution (14). The chloride containing regenerator solution is electrolyzed in a flow cell (20) between two electrodes (50) under polarity reversed DC voltage. An independent claim is also included for an ion exchanger plant with the ion exchanger.

Simple determination of the herbicide napropamide in water and soil samples by room temperature phosphorescence

Abstract: A new, simple, rapid and selective phosphorimetric method for determining napropamide is proposed which demonstrates the applicability of heavy-atom-induced room-temperature phosphorescence for analyzing pesticides in real samples. The phosphorescence signals are a consequence of intermolecular protection and are found exclusively with analytes in the presence of heavy atom salts. Sodium sulfite was used as an oxygen scavenger to minimize room-temperature phosphorescence quenching. The determination was performed in 1 m potassium iodide and 6 rum sodium sulfite at 20 degrees C. The phosphorescence intensity was measured at 520 nm with excitation at 290 nm. Phosphorescence was easily developed, with a linear relation to concentration between 3.2 and 600.0 ng ml(-1) and a detection limit of 3.2 ng ml(-1). The method has been successfully applied to the analysis of napropamide in water and soil samples and an exhaustive interference study was also carried out to display the selectivity of the proposed method. (c) 2005 Society of Chemical Industry.

Multicomponent moisture holding agent in low cost and preparation method

Abstract: The present invention provids a preparation method of multicomponent low-cost water-retaining agent Said water-retaining agent is prepared by adopting two organic monomers of acrylamide and acrylic acid as main agent, adding attapulgite and bentonite as reinforcing agent, using ammonium persulate or potassum persulfate as oxidant, using sodium sulfite and potassium metabisulfite as reducing agent and using N,N'-methylene-diacrylamide as cross-linking agent through a certain preparation process

Magnesium and magnesium alloy chemical oxidation process

Abstract: The chemical magnesium and magnesium alloy oxidizing process includes the technological steps of dehydrogenation, chemically deoiling, washing with hot water, washing with cold water, polishing, washing with cold water and chemical oxidization. The chemical oxidizing solution consists of methyl tetrahydroxyl phthalic anhydride, potassium sulfate or aluminum acetate, boric acid, potassium dichromate or sodium dichromate or sodium tripolyhosphate or sodium sulfite, ammonium molybdate or diammonium biphophate, ammonium nickel sulfate, deionized water and optional dithio dipropyl sulfonate in certain proportion. The present invention can obtain chemical oxide film with corrosion rate not more than 3.739 mm/a. In different chemical oxidizing conditions, oxide films of different colors may be prepared. The present invention may be applied in aeronautics, astronautics, electronics, communication, building, automobile and other industry.

Process for producing anhydrous sodium sulfite using smelting smoke

Abstract: The present invention relates to sodium hydroxide absorption process of utilizing sodium hydroxide in absorbing low density smelting fume to produce anhydrous sodium sulfite. The present invention features that in the absorption tower, fume containing SO2 after being purified is made to countercurrent contact with sodium hydroxide solution to absorb SO2 to pH 5-6, sodium hydroxide is added to regulate pH to 9-10, sodium sulfate solution is added to eliminate iron, and through further filtering in filtering machine, solid-liquid separation and concentration, coarse sodium sulfite product of 42-45 % concentration is obtained, and the anhydrous sodium sulfite product is produced through further hot air contact drying and dewatering. The present invention reduces environmental pollution while producing stable sodium sulfite product.

Producing method for bright yellow anti-myopia health-care paper

Abstract: This invention refers to a kind of peak yellow health-care paper protecting from myopia, and its preparation The process includes crushing wheat stalk, mixing sodium sulfite, sodium hydroxide and anthraquinone with wheat stalk fibers, steam-boiling the said mixture in water to form paper pulp materials, sifting out them to remove impurities, adding liquid chlorine, sodium hydroxide and sodium hypochlorite into them, heating to bleach pulp materials, pulverizing pulp materials; Adding alkali peak yellow, acid violet, aluminum sulphate, rosin glue, dithionite oil etc into pulp materials, diluting paper pulp with water in order to adjust colour, putting paper pulp on shaped net according to meet finished paper thickness, heating and drying to get products This health-care paper is peak yellow, pretty and without lost fresh and hurt eyes Its surface is smoothness, water tolerance and oil tolerance, and physical strength and surface strength reaching the write paper standard

New Techniques for Following the Oxidation of Sodium Sulfite in Mass-Transfer Studies

Abstract: Computer modeling of mass transfer frequently requires empirical validation. Improvements in the empirical chemical method of the catalytic oxidation of sodium sulfite are presented. The oxidation by oxygen was followed by monitoring the change in UV absorption at a wavelength of 260 nm. Liquid was pumped from the reaction vessel, a stirred cell, into a 0.5-mL quartz flow cell inside a UV absorption spectrometer. Different catalysts were investigated for controlling the reaction rate. Cobalt sulfate and cobalt chloride were both successfully used in the analysis. The real-time analysis of the oxidation of sodium sulfite did not require pH stabilization and makes this procedure superior to the standard iodometric titration. In addition, mass-transfer experiments can be miniaturized without loss of accuracy.

Integration method for ammonia process of desulfurizing flue gas and multiple utilizing desulfurized products and equipment

Abstract: A process and apparatus for desulfurizing fume by ammonia method and reclaiming the desulfurized products is disclosed Said process includes dusting the fume of boiler, desulfurizing reaction on ammonia water to generate the aqueous solution of ammonium hydrogen sulfite and ammonium sulfite, filtering to remove suspended substance, adding excessive acid solution, reacting to generate SO2 gas and aqueous solution of ammonium salt, preparing liquid SO2 or anhydrous sodium sulfite from SO2 gas, and preparing solid ammonium salt from its aqueous solution

Technique of wet method of flue gas desulfurization

Abstract: A process for desulfurizing fume by wet method includes such steps as the reaction of Na2CO3 solution as absorbent on SO2 in fume to become sodium sulfite solution, further absorbing SO2 to become sodium hydrogen sulfite, and the reaction of the used absorbent on lime milk to obtain sodium sulfite for cyclic using it.

Effect of sodium sulfite on the dissolution of amorphous silica in aqueous solution

Abstract: 10－3～10－1 M（M＝mol dm－3）の低濃度範囲で，Na2SO3水溶液中での非晶質シリカの溶解速度及び溶解度を求め，純水及びNa＋濃度が等しくなるように調製したNaCl水溶液中での測定値と比較した．非晶質シリカの初期（0～12時間）溶解速度は，陽イオンであるNa＋によって速められたが，陰イオンであるCl－やSO32－にはほとんど影響されなかった．非晶質シリカの溶解度については，NaCl水溶液中では純水中とほぼ同じであったが，Na2SO3水溶液中では溶解度が増加した．増加した原因は，SO32－とケイ酸との錯体生成と考えられる．1 : 1錯体の生成を仮定し，Na2SO3とNaCl水溶液中でのシリカの溶解度の差に基づいて見積もられた条件付き生成定数は，pH 6.7～4.7の範囲で105～1951 M－1であった．

Length Detection‐Flow Analytical System Using Autocatalytic Reaction

Abstract: A flow analytical system using the sodium sulfite/hydrogen peroxide autocatalytic reaction system was developed. A sulfite solution containing a pH indicator and bromo thymol blue (BTB), and a hydrogen peroxide solution were pumped by a mechanical system, and then mixed while flowing. The blue‐colored solution changed to yellow in the mixing coil. Furthermore, when horseradish peroxidase (HRP) was mixed with them, the length of the blue‐colored band decreased. The relationship between the blue band length and logarithm value of the HRP concentration was linear in the concentration range of 1 to 50 ppm.

In Situ Deposition of Co9S8 Nanocrystallite on Its Single-Crystal Flakes at Low Temperatures

Abstract: Co9S8 hexagonal aggregations were synthesized in hydrazine hydrate (N2H4·H2O) solvent at 150 °C for 12 h using cobalt(II) sulfate hydrate (CoSO4·7H2O) and sodium sulfite (Na2SO3) as starting materi...

Process of extracting iodine from dilute phosphoric acid produced in iodine-containing phosphate ore production

Abstract: The process of extracting iodine from dilute phosphoric acid produced in iodine-containing phosphate ore production includes adding hydrogen peroxide solution as oxidant into phosphoric acid for reaction, blowing out molecular iodine with hot air, absorbing with alkaline solution of sodium sulfite, and adding potassium hypochlorite to separate out iodine. Compared with available technology, the present invention is convenient and safe, and can change waste into useful iodine product to reduce environmental pollution.

Culture medium of anaerobic toxin production in use for producing vaccine of treating disease of sheep clostridium

Abstract: An anaerobic toxigenic culture medium for preparing the vaccine of clostridial disease of sheep is prepared from peptone, powder extract of yeast, NaCl, Na2HPO4.12H2O, coarse dextrin, sodium thioalcoholate, glucose, ZnSo4.7H2O, sodium sulfite and water.