Occidental Chemical Corporation

Sharon D Fritts

Tilak V Bommaraju

David L Johnson

Robert L Zeller

Walter W Ruthel

Walter M Opalinski

Robert G Adams

Ronald B Kaplin

Paul J Orosz

Kenneth J Carlson

Joseph Guzzetta

A method of removing HMO.sub.2.sup.- anions from an aqueous silicate solution comprising contacting the solution with a cationic ion exchange resin, where M is manganese, zinc, copper, nickel, or a mixture thereof. The method is particularly applicable to solutions of sodium silicate or potassium silicate.

Removing anions from alkaline silicate solutions

Disclosed is a process for separating chlorine gas from a mixture of gases. The mixture of gases is cooled to a temperature less than 0.degree. C. and is contacted with ice, which results in the formation of chlorine hydrate on the ice. The ice is separated from the mixture of gases and is heated or the operating pressure reduced to release chlorine.

Method of recovering chlorine from a gas mixture

Disclosed is a method of denuding a sodium-mercury amalgam to recover mercury therefrom and produce a sodium alcoholate. The amalgam is reacted with a C.sub.1 to C.sub.4 alcohol in the presence of a catalyst selected from the group consisting of tungsten carbide, iron treated high density carbon, iridium, ruthenium, and mixtures thereof. The resulting sodium alcoholate is separated from the mercury.

Method of denuding sodium mercury amalgam and producing sodium

Disclosed is a method of removing fluoride and sulfate ions from an aqueous stream by adding calcium chloride and a source of phosphate ion to the stream to form a first precipitate of calcium sulfate and a compound of calcium, fluoride, and phosphate. The precipitate is separated from the aqueous stream and a source of carbonate ion is added to the stream to form a second precipitate which contains fluoride and calcium. The second precipitate is then separated from the aqueous stream.

Fluoride removal from aqueous streams

Disclosed is a method of regenerating a cationic exchange resin that has been exposed to chlorate ion. The resin is treated with an acidic regenerating solution that contains sulfite ion in an amount at least stoichiometric with the amount of chlorate remaining on the resin. The resin can either be rinsed with water first and then contacted with an acidic regenerating solution containing sulfite, or the resin can be washed with acidic water containing sulfite ion and then treated with an acidic regenerating solution.

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Youngstown, NY, United States of America

Sharon D Fritts