Showing papers on "Sodium sulfite published in 1973"

Sodium sulfur oxides wastes disposal process

Abstract: Method for disposal of water soluble sodium sulfur oxide-containing wastes resulting from industrial processes producing fly and/or bottom ash from fossil fuel utilization and waste or excess sodium sulfur oxide compounds, particularly disposal of sodium sulfite and/or sodium sulfate resulting from wet or dry sodium alkali scrubbing of tail or flue gases to reduce SO x emissions therefrom as from smelters, power plants, paper plants, glass plants and industrial boiler operations Process involves mixing sodium sulfur oxide wastes with an alumina and silica-containing fly ash and/or bottom ash, forming an agglomerate, such as a pellet or briquette, and sintering in the range of about (1000°-2300°F) The resultant sintered particle shows lower solubility than the current standard of calcium sulfate, being 10sup -2 to 10sup -4 as soluble as the starting sodium sulfur oxides, has increased density (as high as 23 g/l), and reduced volume as compared to the dry fly ash or sodium sulfur oxide wastes, and fixes heavy metals Fly ash leaching and dusting problems are substantially overcome Sodium sulfur oxides include sodium sulfite, sulfate, bisulfite, bisulfate, thiosulfite, persulfite (pyrosulfite), thiosulfate, persulfate (pyrosulfate), and mixtures thereof Sintered particle may be disposed of by known landfill techniques, or used as an aggregate for mulch, road beds, concrete, asphalt or the like

The Half-Molecule of Haptoglobin: Studies on the Product Obtained by the Selective Cleavage of a Haptoglobin Disulfide

Abstract: A disulfide of haptoglobin 1-1 has been selectively cleaved using sodium sulfite and p-chloro-mercurisulfonate. The reaction product (half-haptoglobin) could be separated from haptoglobin by gel el...

Osmotic and activity coefficients for aqueous methane sulfonic acid solutions at 25.deg.

Abstract: where ( F N ~ ~ S O ~ and (PNa2S04 are the osmotic coefficients of the single salt solutions at molality m. As ~ N ~ ~ s o , is known ( 4 ) , (PNa2S03 can be calculated. Values of ( C N ~ ~ S O J are given in Table I . In spite of the correction which had to be made for the sulfate content, it is believed that these values of (FNa2S03 are not in error by more than 0.005. Figure 1 contains plots of the osmotic coefficients OF sodium sulfate, sodium thiosulfate, and sodium dithionate, together with three points for sodium sulfite. The values for the dithionate are somewhat higher than those for the thiosulfate; moreover, they are consistent with the results of the freezing-point measurements ( 7 ) .which gave cp = 0.8288 at the highest concentration, 0.05371 mol kgl . The three points for sodium sulfite lie close to the plot of the thiosulfate results, and thus, for all practical purposes, the osmotic and activity coefficients of sodium thiosulfate (given in Table I I ) can be used for sodium SUI fite.

The Chemical Behavior of Low Valence Sulfur Compounds. VIII. The Oxidation of Sodium Thiosulfate with Ozone

Abstract: The oxidation of sodium thiosulfate with ozone in an aqueous solution was investigated as a part of a series of studies on the chemical behavior of such low-valence sulfur compounds as thiosulfate and sulfite. The ozone oxidation was carried out by blowing a mixed gas of ozone and oxygen continuously into a 0.3–0.6 mol/l solution of sodium thiosulfate at 10–80°C. In a neutral solution, thiosulfate is converted to sulfate, sulfite, tri- and tetrathionates, hydrogen sulfide and sulfur dioxide, and finally to sulfate, tri- and tetrathionates. The yield of the sulfate is only 40% of the total sulfur. In an alkaline solution, however, thiosulfate is oxidized to sulfite as an intermediate, and finally to sulfate. The oxidation of sodium sulfite, and potassium salts of tri- and tetrathionate with ozone was also studied in order to elucidate its mechanism.

Method of insolubilizing demineralizer and cooling tower blowdown wastes

Abstract: Process for insolubilizing water soluble sodium sulfur oxide wastes resulting from backwash of process feedwater demineralizers and cooling tower blowdown wastes. The sodium sulfur oxide wastes, typically sodium sulfate and sulfite, are reacted in solution with ferric ions and sulfuric acid to produce an insoluble, basic hydrous or anhydrous sodium hydroxy ferric sulfate or sulfite compounds of the type Q.sub.v Fe.sub.w (SO.sub.x).sub.y (OH).sub.z.sup.. nH.sub.2 O, wherein Q is NH.sub.4 or Na, v is 1,2,4 or 5, w is selected from 1,2,3,4, or 6, x is 3 and/or 4, y is 2,4,5 or 7 z is 1,2,3,6 or 12, and n is 0 or 3. The principal insoluble compounds include Natrojarosite, Metasideronatrite, Sideronatrite, Depegite which is a mixture of Sideronatrite, Rosarite and Iriite, and mixtures thereof. The reaction takes place at an acid pH in a temperature ranging from about 50.degree.-300.degree. F and may occur in single or multistage reactors. Air and/or bacterial activation at a pH of less than about 5.5 may be employed. The end-product basic, sodium hydroxy ferric sulfate and sulfite compounds are substantially water insoluble, having a solubility of less than the standard calcium sulfate, and may be disposed of by simple landfill without the water pollution hazards inherent with landfilling of wet or dry sodium sulfite or sulfate wastes.

Method of chrome-retanning leather

Abstract: An improved process of chrome-retanning leather in which leather to be chrome-retanned is contacted with basic chromium sulfate and a sulfite salt in an aqueous environment and thereafter the leather is contacted with an aldehyde to deposit chrome as Cr2O3 in the leather and form a leather having over 6 percent by weight of Cr2O3 based on the dry weight of the leather. Sodium sulfite or potassium sulfite can be used as the sulfite salt. Representative aldehydes which can be used are formaldehyde, glutaraldehyde, benzaldehyde, or a compound which in the presence of an acid is converted to an aldehyde.

Electrolytic process for production of perfluorocyclohexane derivatives

Abstract: Aromatic hydrocarbons which have undergone nuclear substitution with a trifluoromethyl group are electrolytically fluorinated in anhydrous hydrogen fluoride. The mixed gas which is consequently formed is sent through the aqueous solution of sodium sulfite containing therein potassium iodide, thereafter cooled and collected, and subjected to refining treatment such as by trap-to-trap distillation, distillation, or gas chromatography to obtain perfluorocyclohexane derivatives.

Process for manufacturing sulfur from a solution of sodium sulfite

Abstract: A solution of sodium sulfite or sulfide is reacted with ammonium sulfate, so as to produce a gas containing SO 2 or H 2 S, NH 3 and H 2 O, which is thereafter treated for sulfur production and NH 3 recovery, and a liquid outflow containing sodium sulfate which is reacted with CO 2 and NH 3 , in order to produce NaHCO 3 and regenerate the ammonium sulfate. NaHCO 3 may be converted to sodium carbonate and CO 2 , the latter being re-used in the process.

Improved method on the determination of methanol using chromotropic acid

Abstract: It is found out that an addition of not only potassium permanganate, phosphoric acid, but also propionaldehyde accelerates more oxidation of methanol to formaldehyde.By using this fact the following procedure of the spectrophotometric determination of methanol is proposed.Oxidize 1ml of the test solution containing 115 μg of methanol by adding 0.2 ml of 0.3 v/v% propionaldehyde solution, 0.4 ml of potassium permanganate solution which is prepared by dissolving 1.5 g of the salt in 30 ml of water and 7.5 ml of 85% phosphoric acid, and by diluting the mixture to 50 ml. Swirl the mixture, and keep it at the room temperature for 5 minutes. Reduce excess permanganate by adding 0.2 ml of 0.2 g/ml sodium sulfite solution. Swirl the mixture, and add 0.3 ml of 0.02 g/ml aqueous chromotropic acid solution. Slowly add 4 ml of 75 v/v% sulfuric acid. Heat the mixture at 8085 °C for 10 minutes with occasional swirling. After cooling to the room temperature, measure the absorbance at 575 nm against the reagent blank obtained by the same procedure. The improved method has higher sensitivity in comparison with the common method, and the calibration curve follows Beer's law over the range of 115 μg/ ml of methanol.

Kinetic study of a complex formation from 1,3,5-trinitrobenzene and sodium sulfite

Abstract: A kinetic study on the formation of a σ-complex from 1,3,5-trinitrobenzene (TNB) and sodium sulfite in aqueous solution was carried out in the temperature range, 10.0–30.0°C by the stopped-flow method. The kinetic and thermodynamic parameters were considered in comparison with those of the σ-complex from TNB and hydroxide ion.