Class 423/519.2 - Sulfite

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Products and processes wherein the compound is a sulfite;
No. of patents: 84
Last issue date: 05/30/2006

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Number	Title	Issue Date
4411875	Dual alkali process for combustion gas cleaning A dual alkali process and an apparatus for the removal of sulfur oxides from a gas stream containing such sulfur oxides, is disclosed....	10/25/1983
4410500	Sodium-limestone double alkali flue gas desulfurization method A flue gas desulfurization method for efficiently removing sulfur oxides from a gas stream with an aqueous sodium sulfite- and sodium bisulfite-containing absorption solution, in which absorber effluent solution at a pH of from 5.8 to 6.6 and having an ac...	10/18/1983
4396594	Sulfur dioxide reduction process Sulfur dioxide is converted to elemental surfur by reduction with a carbonaceous material in a reaction zone containing a molten salt. Heat is provided by reacting a portion of the carbonaceous material with oxygen. In a preferred embodiment alkali metal ...	08/02/1983
4388282	Method for regeneration of sodium sulfite from spent flue gas desulfurization processes A double alkali process employs limestone to regenerate spent sodium sulfite and then recirculates the unreacted limestone to attain a high internal stoichiometry and high limestone utilization. The regeneration of the sodium sulfite is carried out in a p...	06/14/1983
4379130	Process for regenerating scrubbing solutions A method of regenerating a scrubbing solution containing sodium sulfite, sodium bisulfite, sodium sulfate and sometimes sodium hydroxide circulated in scrubbers to remove sulfur oxides from gas streams where sodium sulfite is converted to sodium bisulfite...	04/05/1983
4377557	Process for removal of sulfur oxides from waste gases A process for removing sulfur dioxide from waste gas is provided. The gas is first contacted with an alkaline scrubbing liquor consisting essentially of a sorbent salt in which the cation is sodium or potassium, and one of the anions is borate. The clean ...	03/22/1983
4348289	Water treatment method to remove dissolved oxygen therefrom This specification discloses a method of treating water which contains oxygen dissolved therein to scavenge the oxygen therefrom and reduce the corrosiveness of the water. A sulfur-containing fuel is burned in a flue gas generator to generate a flue gas c...	09/07/1982
4342733	Method of improving sulfite antioxidant performance in high solids scrubbers An improved method for inhibiting sulfite oxidation in scrubber liquor of the type containing sulfite species is disclosed. A topping agent selected from the group consisting of polyphosphate compounds, and organo-phosphonic acid compounds, and mixtures t...	08/03/1982
4331640	Process for removing sulfur dioxide from an exhaust gas containing the same A method for preventing the accumulation of an alkali sulfate produced as a by-product in the system for removing sulfur dioxide from exhaust gases containing sulfur dioxide is disclosed, the system comprising bringing the exhaust gas into contact with an...	05/25/1982
4322392	SO₂ Scrubbing system for flue gas desulfurization Sulfur dioxide is scrubbed from boiler flue gases in a double-loop alkali scrubber, one a quencher loop and the other an absorption loop. The reagent flow of the two loops is isolated so that none of the reagent from the quencher loop is cycled to the abs...	03/30/1982
4313924	Process for removal of sulfur dioxide from gas streams An improved apparatus and process are disclosed for the removal of sulfur oxides such as sulfur dioxide from waste gas streams. The process comprises scrubbing the waste gas with a circulating aqueous sodium sulfite/sodium bisulfite absorption solution at...	02/02/1982
4296079	Method of manufacturing aluminum sulfate from flue gas A continuous process for removing sulfur dioxide from flue gas by reacting sodium aluminate solution with sulfur dioxide to form sodium sulfite and aluminum hydroxy sulfite which are separated and the aluminum hydroxy sulfite oxidized to aluminum sulfate....	10/20/1981
4267156	Method using lime slurry for regenerating sodium sulfite in double alkali flue gas desulfurization process In the process of desulfurizing flue gases in which an alkaline solution of sodium, such as sodium sulfite or sodium hydroxide, is contacted with gases in a scrubber to produce a sodium bisulfite solution, an improved method is provided for substantially ...	05/12/1981
4261962	Sodium sulfite regeneration method using limestone slurry In the Double Alkali flue gas desulfurization process wherein sodium bisulfite is produced in a scrubber from the reaction of sulfur dioxide laden flue gases with an aqueous solution of sodium sulfite, the sodium sulfite is regenerated from the sodium bis...	04/14/1981
4246245	SO₂ Removal Improved methods are provided for the efficient and economic removal of sulfur dioxide from gases which comprise contacting the gas with neutralizing values obtained from Type S hydrated lime, i.e. calcined dolomite slaked with water under elevated temper...	01/20/1981
4231995	Ammonia double-alkali process for removing sulfur oxides from stack gases An ammonia-based double-alkali process for removing sulfur oxides from stack gases. In this process, usually continuous, stack gases are contacted with an aqueous wash liquid containing ammonium sulfite as a sulfur oxide reactive compound to form a spent ...	11/04/1980
4231894	Stabilized alkali metal bisulfite or sulfite-catalyzed solutions The present invention is directed to a method of stabilizing aqueous solutions containing alkali metal sulfite or bisulfite and a catalyst therefor. The catalyzed sulfites which are of primary concern in the present instance are those which are used to in...	11/04/1980
4216189	Sulfur dioxide removal process Sodium sulfate is purged from a sulfur dioxide removal system involving contact of a sulfur dioxide-containing gas with a solution containing sodium sulfite to absorb sulfur dioxide from the gas. The spent absorbing solution is regenerated by desorbing su...	08/05/1980
4212702	Process for recovery of chemicals from pulping waste liquor A process for recovery of chemicals from a sodium sulfite pulping waste liquor is disclosed in which a smelt obtained from the waste liquor is introduced into an aqueous slurry containing solidified smelt while make up water and a weak aqueous slurry are ...	07/15/1980
4207299	Sulphur dioxide removal process Sodium sulfate is purged from a sulfur dioxide removal system involving contact of a sulfur dioxide-containing gas with a solution containing sodium sulfite to absorb sulfur dioxide from the gas. The spent absorbing solution is regenerated by desorbing su...	06/10/1980
4206187	Process for removing sulfur dioxide from gas There is disclosed a process for obtaining purer sodium sulfate from a mixture of solids containing sodium sulfate and sodium sulfite. The process involves contacting an aqueous slurry of the sulfate-sulfite mixture with a sulfur dioxide-containing gas un...	06/03/1980
4201759	Method for regenerating calcium sulfoxy compounds produced in the combustion of carbonaceous fuels in fluidized beds In methods for combusting carbonaceous sulfur-containing fuels in a fluidized bed wherein the fluidized bed contains at least one calcium compound selected from the group consisting of calcium oxide, calcium hydroxide, calcium carbonate and calcium bicarb...	05/06/1980
4200619	Process for purging sodium sulfate from a sulfur dioxide removal system Sodium sulfate is purged from a sulfur dioxide removal system involving contact of a sulfur dioxide-containing gas with a solution containing sodium sulfite to absorb sulfur dioxide from the gas. The spent absorbing solution is regenerated by desorbing su...	04/29/1980
4192723	Aqueous solution of monovalent gold and ammonium sulfite complex, process for the preparation thereof and electrolytic bath obtained therefrom for the plating of gold or gold alloys Aqueous solution of monovalent gold and ammonium sulfite complex. As opposed to the corresponding alkali-gold sulfite solution, this solution is stable under slightly acidic pH conditions and can be used advantageously for preparing electrolytic baths for...	03/11/1980
4177244	Process for purge stream treatment in removal of sulfur dioxide A process for treating the purge stream from an aqueous sodium sulfite/sodium bisulfite solution used in the removal (recovery) of sulfur dioxide from gas is provided wherein the purge stream is mixed with sodium hydroxide or sodium carbonate, the mix is ...	12/04/1979
4164554	Method for converting calcium sulfoxy compounds into calcium carbonate compounds A method for converting calcium sulfoxy compounds selected from the group consisting of CaSOx and Ca(HSOx)2 where x is 3 or 4, into calcium carbonate by a method consisting essentially of: (a) converting the Ca(HSOx	08/14/1979
4141785	Process for recovery of chemicals from pulping waste liquor A process for recovery of chemicals from a sodium sulfite pulping waste liquor is disclosed in which a smelt obtained from the waste liquor is introduced into an aqueous slurry containing solidified smelt while make up water and a weak aqueous slurry are ...	02/27/1979
4113848	Method of producing solutions containing cuprous ions Copper is processed via solutions of copper salts, both cupric and cuprous, in acidified aqueous solutions containing organic nitriles. Methods of producting solutions of cuprous salts include reduction of cupric salts and oxidation of copper and copper s...	09/12/1978
4112061	Production of sodium sulfite utilizing mother liquor from the sodium metabisulfite process Anhydrous sodium sulfite is made by a process involving introducing substantially anhydrous sodium carbonate concurrently with impurities-containing mother liquor from which sodium metabisulfite crystals have been crystallized and sulfur dioxide-containin...	09/05/1978
4058587	Process for removing impurities from acidic fluid solutions A process is disclosed for removing impurities such as carbon dioxide, and sulfur dioxide from acidic fluid solutions using a serpentine material and producing a reaction product comprising recoverable metal values and finely divided silica. In accordance...	11/15/1977
4044101	Method of treating exhaust gases containing nitrogen oxides and sulfurous acid gas A method of removing NOx and SO2 from an exhaust gas containing NOx and SO2 which comprises contacting an exhaust gas containing NOx and SO2 with an aqueous solution containing M2 ...	08/23/1977
4042675	Process for treating the mother liquor by pH adjusting in the production of anhydrous sodium dithionite In the production of anhydrous sodium dithionite by reacting sodium formate, an alkaline sodium compound and sulfurous acid anhydride in hydrous methanol, a process for treating the mother liquor, which comprises adding an alkali to the mother liquor left...	08/16/1977
4042674	Process for treating the mother liquor by cooling in the production of anhydrous sodium dithionite In the production of anhydrous sodium dithionite by reacting sodium formate, an alkaline sodium compound and sulfurous acid anhydride in hydrous methanol, a process for treating the mother liquor, which comprises cooling the mother liquor left after the s...	08/16/1977
4003985	Production of sodium sulfite Anhydrous sodium sulfite is made by a process involving introducing substantially anhydrous sodium carbonate concurrently with sulfur dioxide-containing gas into a saturated solution of sodium sulfite maintained at pH of between about 6.5 and about 7.6 at...	01/18/1977
3995006	Sulphur dioxide absorption system A system for improving the absorption of gaseous SO2 contained in flue gases by contact with an absorbing slurry, separating the unreacted solids from the reacted solids in the slurry product of the absorption in an inertial separator and recyc...	11/30/1976
3992512	Finely particulated colloidal platinum compound and sol for producing the same, and method of preparation This disclosure deals with novel very fine, particulated colloidal platinum of the 15-25 Angstrom size range of unusual catalytic activity and particularly adapted for adsorption upon various substrata, and produced from a new platinum sulfite acid and a ...	11/16/1976
3991162	Absorption system The use of a 1-35%, by weight, aqueous solution of a composition of sodium pyrosulfite and sodium sulfite at a pressure of approximately one atmosphere and a temperature of 75°-155° F. to remove substantially all sulfur dioxide from gas streams containi...	11/09/1976
3989796	Method for removing sulfur dioxide in the form of calcium sulfite from combustion exhaust gas There is disclosed a method wherein sulfur dioxide contained in combustion exhaust gas is absorbed in an aqueous alkali sulfite solution to produce a corresponding alkali bisulfite and the resultant aqueous alkali bisulfite solution is added with calcium ...	11/02/1976
3966890	Method of producing solutions containing cuprous ions Methods of reducing aqueous solutions of cupric sulfate to cuprous solutions by using organic nitrile compositions are disclosed. The particular nitrile used is acetonitrile and the reductant is sulphur dioxide. The method has application commercially to ...	06/29/1976
3966880	Method for producing alkali metal gold sulfite A process for making high purity alkali produced is sulfite substantially free from chloride ions includes the step of admixing gold chloride solution with magnesium oxide at an alkaline pH to form magnesium aurate which is recoverable as a coating upon t...	06/29/1976

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Class 423/519.2 - Sulfite