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Class 423/425 - Sesquicarbonate


Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Products or processes in which the product is a sesquicarbonate,
No. of patents: 17
Last issue date: 03/23/2010


NumberTitleIssue Date
7682588Process for the manufacture of sodium carbonate
Process for the manufacture of sodium carbonate crystals comprising: the addition of solid sodium carbonate (1) to an aqueous solution comprising sodium bicarbonate and sodium carbonate; the crystallization and the separation of sodium sesquicarbonate crystal...
03/23/2010
6576209Process for producing sodium salts
A process for producing sodium salts, which comprises adding solid sodium carbonate to a first aqueous solution containing sodium carbonate and sodium hydrogencarbonate, to prepare a second aqueous solution, precipitating, separating and recovering from t...
06/10/2003
6221233Aluminum production utilizing positively charged alumina
The smelting of aluminum from alumina in the Hall-Heroult process can be dramatically improved by lowering power consumption and in the use of carbon free anodes by using a feed of positively charged alumina. Laboratory experiments have shown that the app...
04/24/2001
6207123Process for producing sodium salts
A process for producing sodium salts, which comprises adding solid sodium carbonate to a first aqueous solution containing sodium carbonate and sodium hydrogencarbonate, to prepare a second aqueous solution, precipitating, separating and recovering from t...
03/27/2001
5112592Process for curing bicarbonates
A process for reducing the amount of residual carbonate on alkali metal bicarbonates which comprises: (a) feeding a dry bicarbonate into a reaction zone, (b) admixing the bicarbonate with carbon dioxide gas saturated with water vapor at a temperature T1
05/12/1992
5034114Acid neutralizing combustion additive with detergent builder
Boiler fouling, particularly in air preheater section, is minimized by combining with a substance designed to neutralize acids a detergent builder such as the sodium, potassium and ammonium phosphates, polyphosphates, silicates, metasilicates, borates, me...
07/23/1991
4652437Process for producing anhydrous sodium carbonate
A process for producing anhydrous sodium carbonate by the pyrolysis of wet sodium bicarbonate, which comprises (a) a step of forming a complex salt selected from the group consisting of Na2 CO3.3NaHCO.sub.3 and Na2 CO...
03/24/1987
4564508Process for the recovery of sodium carbonate from salt mixtures
Mined salt mixtures comprising sodium-carbonate, -bicarbonate, -chloride, -sulfate, and -double salts, such as trona and burkeite, are leached with a bicarbonate-saturated solution and added carbon dioxide to selectively dissolve the sodium chloride, sodi...
01/14/1986
4459272Dry carbonation process
A process for the dry carbonation of an ammonium or alkali metal carbonate containing material, or a mixture thereof, for conversion to the corresponding bicarbonate containing material comprising reacting in the solid phase an ammonium and/or alkali meta...
07/10/1984
4285925Process for the conversion of light ash to absorptive low bulk density alkali products
A method for production of absorptive particles of Wegscheider's Salt (Na2 CO3.3NaHCO.sub.3) having low bulk density and acceptable flow properties, by reaction of anhydrous sodium carbonate particles with water and carbon dioxide is...
08/25/1981
4283372Recovery of alkali values from sodium bicarbonate-containing ore with ammonia
A method for recovering alkali value from sodium bicarbonate-containing ore by utilizing an aqueous solvent containing ammonia. The aqueous ammonia solvent is contacted with the ore to solubilize the sodium bicarbonate-containing ore. The alkali values in...
08/11/1981
4151266Method for the conversion of anhydrous sodium carbonate to Wegscheider's Salt
A one-stage method for production of free-flowing, absorptive particles of Wegscheider's Salt (Na2 CO3 .multidot.3NaHCO3), having a low bulk density, low alkalinity and low friability, by reaction of higher bulk density, a...
04/24/1979
4116757Solar evaporation of alkaline trona-process waste pond liquors with acid black 2 and acid green 1
A process is provided for increasing the rate of solar evaporation of water from alkaline trona-process waste liquors which comprises introducing to the waste liquors an effective amount of a dye selected from the group consisting of Acid Black 2 and Acid...
09/26/1978
4115525Absorptive low bulk density product from sodium sesquicarbonate
Conversion of sodium sesquicarbonate particles to particles of lower bulk density, as low as 180 grams per liter, with high absorption property capable of absorbing as much as 40 percent of wetting agent and with good resistance to breakage and attrition ...
09/19/1978
3984527Production of low bulk density product from sodium bicarbonate by the use of an inert gas stream
Low bulk density products containing at least 10% Wegscheider's Salt, by weight, in needlelike form are produced from sodium bicarbonate by heating in the presence of a slow inert gas stream an aqueous feed mixture comprising, by weight, at least about 50...
10/05/1976
3981686Clarifier process for producing sodium carbonate
Method for clarifying a carbonate process solution containing suspended insolubles which solution is used in the preparation of crystals selected from the group consisting of sodium bicarbonate, sodium sesquicarbonate, anhydrous sodium carbonate, and sodi...
09/21/1976
3944500Production of low bulk density product from sodium bicarbonate
Low bulk density products containing at least 10% Wegscheider's Salt (Na2 CO3.3NaHCO.sub.3), by weight, in needlelike form are produced from sodium bicarbonate by heating in two distinct steps an aqueous feed mixture comprising by we...
03/16/1976
 
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