Showing papers on "Sodium sulfite published in 1969"

Process for removal of sulfur dioxide from gas streams

Abstract: The disclosure is of an improvement in a sulfur dioxide removal process wherein a sulfur dioxide-containing gas is contacted with an aqueous absorbing solution of a metal sulfite, e.g., sodium sulfite, to yield a spent absorbing solution of metal bisulfite, and the latter is subjected to conditions of temperature, pressure and residence time in a desorption zone sufficient to decompose the bisulfite to the sulfite, sulfur dioxide and water, with the water and sulfur dioxide being evaporated and the sulfite precipitated from solution. The precipitated sulfite is separated from its mother liquor and dissolved in water and the resultant solution is recycled as fresh absorbing solution. The improvement comprises recycling to the desorption zone the major portion, preferably substantially all, of the mother liquor from which the precipitated sulfite has been separated.

Removal of sulfur dioxide from waste gases

Abstract: A PROCESS IS PROVIDED TO EFFICIENTLY AND ECONOMICALLY ABSORB AND RECOVER THE SULFUR DIOXIDE CONTENT OF WASTE GAS STREAMS, AND THUS ELIMINATE AIR POLLUTION AND PRODUCE A USEFUL SULFUR-CONTAINING PRODUCT. SULFUR DIOXIDE IS RECOVERED FROM A WASTE GAS STREAM, SUCH AS THE FLUE GAS FROM A STEAM POWER BOILER WHICH BURNS A SULFUR-CONTAINING FUEL SUCH AS COAL, BY SCRUBBING THE WASTE GAS STREAM WITH AN AQUEOUS SOLUTION CONTAINING SODIUM SULFITE AND SODIUM BISULFITE. SULFUR DIOXIDE IS ABSORBED INTO THE AQUEOUS SCRUBBING SOLUTION AND REACTSS WITH SODIUM SULFITE TO FORM FURTHER SODIUM BISULFITE IN AQUEOUS SOLUTION. THE RESULTING SOLUTION IS DIVIDED INTO A FIRST PORTION AND A SECOND PORTION. MAGNESIUM OXIDE OR HYDROXIDE IS ADDED TO THE FIRST PORTION TO CONVERT SODIUM BISULFITE TO SODIUM SULFITE AND PRECIPITATE SOLID MAGNESIUM SULFITE, WHICH IS FILTERED OR OTHERWISE SEPARATED FROM THE SOLUTION AND PROCESSED TO RECOVER A VALUABLE SULFUR-CONTAINING PRODUCT, SUCH AS BY CALCINING TO PRODUCE A GAS STREAM RICH IN SULFUR DIOXIDE OR ELEMENTS SULFUR VAPLOR, OR BY OXIDIZING TO MAGNESIUM SULFATE PRODUCT. THE RESIDUAL SOLUTION IS COMBINED WITH THE SECOND SCRUBBING SOLUTION PORTION, AND THE COMBINED SOLUTION IS RECYCLED FOR FURTHER WASTE GAS SCRUBBING.

Rate of ammonium sulfite oxidation in aqueous solutions

Abstract: The rate of the homogeneous reaction of dissolved oxygen and ammonium sulfite in aqueous solutions without catalysts, which has industrial importance in recovery of sulfur dioxide, was studied at 2O, 25 and 3O °C. A polarographic method using a platinum microelectrode was employed for the determination of the oxygen concentration during the course of reaction. Two reactors of different size, which contained O.5 and 4.7 l of solution, respectively, were found to give essentially the same results. The rate of ammonium sulfite oxidation was found to be about one tenth of that of sodium sulfite. The influence of impurities on the rate was found very remarkable. The existence of inhibitors suggested that the reaction might be a radical one. An empirical rate equation, r=k[SO32-]3/2[O2]0[H+]2 in M•min-1 with k= 1.6× 1039exp(-35× 103/RT), was obtained in the experimental range of this work.

Preparation and properties of sodium alkyl sulfoacetates

Abstract: The preparation and properties for a homologous series of sodium salts of alkyl sulfoacetates, containing 10, 12, 14 and 16 carbon atoms are described. The sodium salts of alkyl sulfoacetates were prepared from monochloroacetic acid, sodium sulfite and corresponding higher alcohol. The Krafft point, c.m.c. value, surface tension, solubilizing power, emulsifying power, foaming power, and calcium ion stability and resistance to acid hydrolysis were measured as the properties of these compounds. The c.m.c. values at 40 C obtained by electrical conductivity were related to the alkyl carbon number (N) of the compounds by log c.m.c.=4.852–0.301 N. Solubilizing power, emulsifying power and foaming power increased with the number of carbon atoms of alkyl chain in the surfactant. But the calcium ion stability and resistance to the acid hydrolysis decreased with an increase in the length of the hydrophobic portion.

Recovery of sulfur values from flue gases with oxidized neutral sulfite green liquor

Abstract: A process for the utilization of sulfur compounds in spent pulping liquors and flue gases, said process including the oxidation of neutral sulfite green liquor with air or oxygen under heat and pressure to form an alkaline solution containing sodium sulfate, sodium thiosulfate, sodium sulfite, sodium hydroxide and sodium carbonate, suitable for recovery of sulfur dioxide from flue gases to obtain a product liquor suitable for use in a pulping process.

[Influence of sodium sulfite, sodium tellurite and sodium selenite on the retention of zinc, cadmium and mercury in the organism].

Abstract: The influence of sodium sulfite, sodium tellurite and sodium selenite on the retention of zinc, cadmium and mercury in mice was studied. The retention of mercury was increased by sodium selenite and by sodium tellurite. The retention of cadmium was increased only by sodium selenite. Sodium sulfite did not influence the retention of metals studied. The retention of zinc was not influenced by any compounds used.

Direct oxidative conversion of sodium sulfide to sodium sulfite by absorbing the heat of reaction in a fluidized bed system using adiabatic cooling

Abstract: Process for simultaneously producing sulfite pulping chemical from a spent pulping medium by the exothermic oxidative conversion of sodium sulfide to sodium sulfite and for the control of the temperature in exothermic reaction and also for employing the exothermic reaction heat to make steam to be mixed with air for use in said oxidation process. Ground particles of a spent pulping smelt are treated in a fluidized bed reactor in intimate contact with moving air enriched with steam for about 10 seconds to 2 hours, wherein the weight ratio of steam to air ranges from about 0.2 to 1 to 1.2 to 1. The temperature in the reactor is adiabatically controlled and the heat of reaction generated in the reactor is absorbed by adiabatic cooling to form the steam used in the reactor.

Recovery of sulfur dioxide from waste gas streams

Abstract: Sulfur dioxide is scrubbed from a waste gas stream using an aqueous sodium sulfite solution. The resulting solution containing sodium bisulfite and residual sodium sulfite is divided into two portions. Sodium carbonate is added to the first solution portion to convert sodium bisulfite to sodium sulfite, and the resulting solution is recycled for further gas scrubbing. The second portion is reacted with a solid carbonate reactant such as dolomite, magnesite or limestone, to form sodium carbonate in solution and precipitate solid crystals containing magnesium sulfite and/or calcium sulfite. The sodium carbonate is added to the first solution portion for the conversion of bisulfite to sulfite. The solid crystals are processed at elevated temperature to produce a sulfur-containing product and a mixture of solid magnesium oxide and calcium oxide, or either pure magnesium oxide or calcium oxide, depending on the solid reactant selected in the prior processing.

Method for converting sodium sulfide to sodium sulfite

Abstract: A PROCESS FOR CONVERTING SODIUM SULFIDE IN THE SMELT RESULTED FROM THE BURNING OF BLACK LIQUOR DIGESTERS OF SEMICHEMICAL PULP AND SULFITE PULP TO SODIUM SULFITE BY OXIDATION AND RECOVERING THE LATTER AS PULP DIGESTING CHEMICAL, WHICH COMPRISES MIXING THE SMELT PARTICLES WITH WATER, ADDING THERETO A MINOR AMOUNT OF SODIUM HYDROXIDE FORMING THE MIXTURE INTO PARTICLES AND INTRODUCING THE PARTICLES INTO A CONVERTER PACKED WITH DRY POWDER OF SODIUM SULFITE, SODIUM CARBONATE, ETC. CONTAINING NO SODI- UM SULFIDE, THE PROCESS BEING PERFORMED THROUGHOUT AS A WET PROCESS.

Potential of Sodium Sulfite Catalyzed with Cobalt Chloride in Harvesting Fish

Abstract: (1969). Potential of Sodium Sulfite Catalyzed with Cobalt Chloride in Harvesting Fish. The Progressive Fish-Culturist: Vol. 31, No. 3, pp. 149-154.

Process for the production of methallyl sulfonate

Abstract: PROCESS FOR THE PRODUCTION OF METHALLYL SULFONATE BY REACTING A CONCENTRATED AQEUOUS SOLUTION OF SODIUM SULFITE WITH AT LEAST A 5% MOLAR EXCESS OF METHALYL CHLORIDE IN THE PRESENCE OF AN EMULSIFIER AND RECOVERING THE PRODUCT BY COOLING THE REACTION MIXTURE TO A TEMPERATURE OF 0-15*C.

Thermochemistry of hypochlorite oxidations

Abstract: Students mix various proportions of aqueous sodium hypochlorite and sodium sulfite and plot the change in temperature to determine the stoichiometry of the reaction.

Process for production of sodium sulfite

Abstract: Production of anhydrous sodium sulfite by contact reaction between combustion exhaust gas containing a small amount of sulfurous acid gas with sodium sulfite containing solution.