Class 423/519 - Bisulfite

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Products or processes wherein the compound contains the
No. of patents: 36
Last issue date: 07/26/2011

Number	Title	Issue Date
7985396	Process for production of sodium bisulfite Processes for producing sodium bisulfite from sodium sulfite purge streams are disclosed which enable recovery of additional resource material including sodium bisulfite. ...	07/26/2011
7074952	Synthesis of taxol enhancers Disclosed is a method of preparing a thiohydrazide product compound from a hydrazide starting compound. The hydrazide starting compound is represented by Structural Formula (I): The thiohydrazide product compound...	07/11/2006
7052669	Process for production of ammonium thiosulphate A process for continuous production of ammonium thiosulphate, (NH4)2S2O3 (ATS) from NH3, H2S and SO2 is disclosed. A first feed stream comprising H2O, H2S and NH3...	05/30/2006
6887452	System and method for precipitating salts A system and method for producing salts using a crystallizer with an integrated column is disclosed. In the column, liquid, containing one reactant, absorbs a second reactant, from the gas stream. The second reactant reacts with the first reactant to produce salt. L...	05/03/2005
6159440	Process for production of ammonium thiosulphate A process for continuous production of ammonium thiosulphate from H2 S, SO2, and NH3 comprising steps of producing in a first absorption step a solution of ammonium hydrogen sulphite by contacting a first gas stream compri...	12/12/2000
5977312	Modified wheat glutens and use thereof in fabrication of films Wheat gluten protein-based biodegradable or edible films are produced using aqueous, essentially alcohol-free casting dispersions containing modified wheat protein and a plasticizer. The modified wheat protein is prepared by treating purified naturally oc...	11/02/1999
5976485	Sodium metabisulfite process Sulfur dioxide is introduced into a solution of sodium sulfite and sodium bisulfite to form sodium bisulfite in a solution having dissolved sulfur dioxide present with a pH between 3.5 and 4.2. The solution is drawn to a cooling crystallizer where an alka...	11/02/1999
5965708	Modified wheat glutens and use thereof in fabrication of films Gluten protein-based biodegradable or edible films are produced using aqueous, essentially alcohol-free casting dispersions containing modified protein (preferably wheat gluten protein) and a plasticizer. The modified protein is prepared by treating purif...	10/12/1999
5753200	Sodium metabisulfite process Sulfur dioxide is introduced into a solution of sodium sulfite and sodium bisulfite to form sodium bisulfite in a solution having dissolved sulfur dioxide present with a pH between 3.5 and 4.2. The solution is drawn to a cooling crystallizer where sodium ...	05/19/1998
5747648	Modified wheat glutens and use thereof in fabrication of films Wheat gluten protein-based biodegradable or edible films are produced using aqueous, essentially alcohol-free casting dispersions containing modified wheat protein and a plasticizer. The modified wheat protein is prepared by treating purified naturally oc...	05/05/1998
5567406	Manufacturing clear potassium sulfite Disclosed is a method of manufacturing potassium sulfite from a potassium hydroxide feedstock. A feedstock is tested for the presence of iron and, if the feedstock contains less than 0.3 ppm of iron, it is reacted with sulfur dioxide in an aqueous solutio...	10/22/1996
5366716	Method for recovering sulphur dioxide from the chemical circulation of a sulphate pulp mill Sulphur dioxide is separated from the flue gases of a cellulose pulp mill by absorbing it into a sodium sulphite solution. Sulphur dioxide is regenerated from the sodium bisulphite solution produced by an evaporation-crystallization method utilizing therm...	11/22/1994
5266296	Cocurrent flow process for the manufacture of sodium sulfite and bisulfite solutions Sodium (bi)sulfites are produced by the steps of: (a) introducing a stream of aqueous sodium carbonate into the top end of a main packed column reactor; (b) introducing a stream of sulfur dioxide gas into the top end of the main packed column reactor concurren...	11/30/1993
4937056	Process for obtaining high purity magnesium compounds from magnesium containing materials Processes for the selective leaching of magnesium-containing solids, which contain calcium and/or heavy metals, and the selective precipitation and crystallization of the leached magnesium are provided. The leaching is conducted with aqueous sulphur dioxi...	06/26/1990
4844880	Process for the manufacture of sodium metabisulfite An improved process for the manufacture of sodium metabisulfite is provided. In this process, the chemical reaction forming sodium bisulfite solution is carried out separately from the crystallization of sodium metabisulfite. The crystallization step is c...	07/04/1989
4680136	Method for preparing compositions which can be used in the production of sodium dithionite; and the use of such compositions There is provided a method for producing compositions which can be used for preparing sodium dithionite, in which sulphur dioxide is brought into contact with a recirculating aqueous solution of sodium hydroxide and previously absorbed sulphur dioxide to ...	07/14/1987
4540556	Dual alkali scrubber liquor regeneration with production of gypsum A process for the recovery of gypsum as a product of a dual alkali system for regeneration of a sodium base alkaline scrubber liquor in which the liquor reacts with ground limestone in two serially connected sludge blankets containing from 15%-40% solids ...	09/10/1985
4462969	Regeneration of sulfur dioxide scrubber liquor A process of regeneration of scrubber bleed liquor discharged from SO2 gas scrubber in which there are provided two serially connected sludge blankets containing 15-40% finely divided solids in liquor overlain by a relatively clear supernatant ...	07/31/1984
4454101	Dewatering of flue gas desulfurization sulfite solids The dewatering capabilities of sulfite sludges from flue gas desulfurization facilities are substantially improved by the addition of relatively small amounts of sodium thiosulfate additive, or additives derived from or related to sodium thiosulfate, into...	06/12/1984
4431615	Process for the recovery of magnesium and/or nickel by liquid-liquid extraction The recovery of substantially pure magnesium and/or nickel sulphite which is present in a solid starting meterial. The latter is treated with gaseous SO2 in water, the solution obtained is treated by a liquid-liquid extraction, to give an aqueo...	02/14/1984
4387084	Process for treating thiosulfate containing liquors A process for treating thiosulfate containing liquors such as coke oven gas scrubbing liquors by first adding acid, preferably sulfuric acid, to convert thiosulfate to elemental sulfur and bisulfite, separating and removing the elemental sulfur, and subje...	06/07/1983
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
4370239	Bisulfite sponge process Sulfite ions are removed from an aqueous liquid by decreasing the pH of the liquid to convert at least a portion of the sulfite ions to bisulfite ions and contacting the liquid with a macroreticular solid compound containing carbonyl groups that can form ...	01/25/1983
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
4196175	Process for removing a bisulfite salt from an aqueous solution by chemisorption A process is provided for removing a bisulfite salt from an aqueous solution by chemisorbing the salt onto a macroreticular organic compound containing carbonyl functional groups and regenerating the compound....	04/01/1980
4154802	Upgrading of magnesium containing materials This invention is concerned with the recovery of relatively pure magnesia from magnesite which is normally contaminated with too much silica and silicates to permit the magnesite simply to be calcined for the recovery of refractory grade magnesia. The mag...	05/15/1979
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
4110154	Method for making a soluble sulfite additive for use in a pulp making process Sodium bisulfite, for use in the acid digestion of wood to produce pulp is obtained for the process by passing calcium bisulfite through a strong cation exchange resin in the sodium form and regenerating the exchanger with sodium chloride. The calcium bis...	08/29/1978
4107015	Method for removal of SO₂ from gases Removal of sulfur dioxide from an aqueous solution containing the same is effected by subjecting the solution to electrodialytic water splitting. In particular SO2 is removed from dilute gas streams by means of alkaline solution scrubbing, rege...	08/15/1978
4009088	Process for producing aqueous solutions of sodium, ammonium and magnesium sulphite A continuously operative electrochemical ion exchange process for producing sodium, ammonium or magnesium sulphite or hydrogen sulphite in an aqueous solution simultaneously with the production of a useful calcium salt as a by-product by subjecting an aqu...	02/22/1977
4001374	Process for removing ammonia from gases A process to remove ammonia from gases by washing the gases with an inorganic acid of ammonium bisulfite. The ammonia removed from the gas transforms the washing liquid into ammonium salt solution. This salt solution then undergoes a separate processing b...	01/04/1977
3995015	Process for making sodium metabisulfite Improvement in the process for making sodium metabisulfite by contacting a suspension of sodium carbonate in countercurrent stream with sulfur dioxide, which involves passing sulfur dioxide-containing gas sequentially through a first and a second reaction...	11/30/1976
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
3965242	Method for desulfurizing exhaust gas by alkali sulphite-gypsum process Process for through desulfurization of exhaust gas by treating the gas through the steps of absorption, double decomposition, oxidation, and alkali sulfate conversion....	06/22/1976
3937793	Process for the continuous manufacture of crystallized ammonium thiosulfate Crystallized ammonium thiosulfate is manufactured by converting ammonia with oxygen containing sulfur dioxide in ammonium thiosulfate solution to ammonium bisulfite and ammonium sulfite in a first step, while maintaining a pH of from 5.5 to 7.0 and a reac...	02/10/1976

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Class 423/519 - Bisulfite