Topic
Sodium sulfite
About: Sodium sulfite is a research topic. Over the lifetime, 2548 publications have been published within this topic receiving 18523 citations. The topic is also known as: Na2SO3 & Anhydrous sodium sulfite.
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TL;DR: Alkaline sulfite pulping of corn stalks was investigated to produce supplementary pulp for corrugating board manufacture in this article, where three pulping temperatures (125, 145, and 165°C) and five active alkali charges (10, 12, 14, 16, and 18%) were used.
Abstract: Alkaline sulfite pulping of corn stalks was investigated to produce supplementary pulp for corrugating board manufacture. Three pulping temperatures (125, 145, and 165°C) and five active alkali charges (10, 12, 14, 16, and 18%) were used. Cooking time at 30 minutes, Na2SO3/ NaOH ratio at 50:50, and liquor to residue ratio of 8:1 were kept constant. The highest total yield (61.9%) was reached applying the treatment combination of 125°C and 10% active alkali, and the lowest total yield (42.5%) was related to 165°C and 16% chemical. The influence of sodium sulfite/sodium hydroxide ratios was studied applying different ratios (30:70, 40:60, 50:50, 60:40, and 70:30) at constant time and temperature of 30 minutes and 145°C respectively and 14 and 16% active alkali. Pulping condition; 16% active alkali, 30 minutes time, 145°C pulping temperature and varying ratios of sodium sulfite/sodium hydroxide were selected for pulp strength evaluation. The results of handsheet evaluation indicated that 16% active alkali, 30 minutes pulping at 145oC and sodium sulfite/sodium hydroxide ratio of 50:50 is the optimum pulping condition for corn stalks. Tear, tensile, and burst indices and breaking length of this pulp were measured as 10.53 mN.m2g-1, 62.4 N.mg-1, 3.80 kPa.m2g-1, and 6.07 km, respectively.
15 citations
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11 Feb 2004
TL;DR: In this paper, a process for recovering sodium bicarbonate and ammonium sulfate from a sodium sulfate solution is described. But this process is performed using evaporation and precipitation unit operations in a unique sequence.
Abstract: A process for recovering sodium bicarbonate and ammonium sulfate from a sodium sulfate solution. The sodium sulfate solution can be pure or contain other compounds such as sodium sulfite, carbonate, chloride, fluoride, nitrate and nitrite as would be the case if the sodium sulfate solution were derived from a sodium bicarbonate flue gas purification process. Carbon dioxide and ammonia gases or solid ammonium bicarbonate are added to the sodium sulfate solution to precipitate sodium bicarbonate which is removed from solution. The remaining solution is treated in a unique series of precipitation steps in which reactants are first recycled back to the sodium bicarbonate crystallizer and then the amount of sodium in the solution is adjusted to an amount that allows high grade ammonium sulfate fertilizer product to be produced. The process is accomplished using evaporation and precipitation unit operations in a unique sequence that results in 100% conversion of the sodium salt feed stock to sodium bicarbonate and ammonium sulfate in a commercially viable manner.
15 citations
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07 Dec 2005
TL;DR: In this article, a high performance water-reducing agent of sulfanilate-sulfonated acetone-formaldehyde condensate and process for preparation is described, wherein the water reducing agent water, p-aminobenzene -sulfonic acid or sulfanile, 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.
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.
15 citations
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21 Jul 2004
TL;DR: In this paper, an adsorption-absorption reaction type formaldehyde removing agent is composed of an active carbon, alumina, diatomite, polyamide or water for adsorbing and absorbing the formaldehyde from indoor air, and reactant (sodium sulfite and ammonium salt or hydroxy amine hydrochloride) for reacting on adsorbed and absorbed formaldehyde to become non-toxic, noodor and non-pollution substance.
Abstract: An adsorption-absorption reaction type formaldehyde removing agent is composed of adsorption-absorption agent (activated carbon, alumina, diatomite, polyamide or water) for adsorbing and absorbing the formaldehyde from indoor air, and reactant (sodium sulfite and ammonium salt or hydroxy amine hydrochloride) for reacting on adsorbed and absorbed formaldehyde to become non-toxic, no-odor and non-pollution substance.
15 citations
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TL;DR: In this article, the volumetric mass transfer coefficient of physical absorption (kL0a) was measured under identical experimental conditions in the same batch of liquid and it was found that the oxygen absorption is not chemically enhanced.
Abstract: Oxygen absorption enhancement in a sodium sulfite solution was studied in the absence and presence of copper catalyst both for absorption across the liquid surface in a stirred cell and for absorption from individual bubbles rising through a turbulent liquid. The enhancement factor was determined from the ratio of oxygen and argon mass transfer coefficients, measured under identical experimental conditions in the same batch of liquid. It has been found that the oxygen absorption is not chemically enhanced, as long as the mass transfer coefficient, kL0, is high enough, i.e., higher than the value 1.4 × 10−4 m sec−1 for the sulfite solution we used. An analysis of our data as well as literature data indicates that the sulfite system is poorly suited for studies of the volumetric mass transfer coefficient of physical absorption (kL0a) in fermentors, inasmuch as oxygen absorption can be chemically enhanced while the degree of enhancement depends on the operating conditions of batch aeration, as well as on the concentration of trace impurities with catalytic effects upon the sulfite solution used.
15 citations