Abstract: The drying of moist CO.sub.2 at conditions above or near the critical point of CO.sub.2 is improved by contacting the CO.sub.2 with an electrolyte desiccant adsorbed on a permeable solid desiccant.

Abstract: The drying of moist CO.sub.2, at conditions above or near its critical point, is improved by contacting the CO.sub.2 first with an aqueous liquid desiccant and then with a permeable solid desiccant.

Abstract: In drying supercritical or nearcritical CO.sub.2 for use at supercritical conditions, the loss of desiccant, contamination of product, compressor horsepower requirements, and heat requirements can be substantially minimized by using glycerol as the desiccant.

Abstract: A cyclic process for the removal of hydrogen sulfide, and carbon dioxide, from a variety of gas streams is disclosed. The gas stream containing the sour gas(es) is contacted with an aqueous solution of a specific reactant ligand or chelate, or mixtures thereof, optionally in an absorbent, containing specific stabilizers for improvement of chelate life. The hydrogen sulfide is converted to sulfur, CO.sub.2 may be absorbed to produce a purified gas stream, and the reactant chelate is reduced. The process includes sulfur removal and regeneration of the reactant chelate.

Abstract: A cyclic process for the removal of hydrogen sulfide, and carbon dioxide, from a variety of gas streams is disclosed. The gas stream containing the sour gas is contacted with reactant solution containing specified reactant materials and a minor amount of a monoalcohol (C.sub.n H.sub.2n+1 OH, where n is 4 through 18) crystal modifier. The hydrogen sulfide is converted to sulfur, CO.sub.2 is absorbed to produce a purified gas stream, the reactant material is reduced, and good quality sulfur is produced. The process includes removal of the sulfur and regeneration of the reactant.

Abstract: A cyclic process for the removal of H.sub.2 S from gas streams is disclosed, the process being characterized by reaction of the H.sub.2 S to sulfur employing specific aqueous solution reactants, and by recovery of the sulfur employing frothing and extraction techniques.

Abstract: A cyclic process for the removal of hydrogen sulfide, and carbon dioxide, from a variety of gas streams is disclosed. The gas stream containing the sour gas(es) is contacted with an aqueous solution of a specific reactant ligands or chelate, or mixtures thereof, optionally in an absorbent, containing specific stabilizers for improvement of chelate life. The hydrogen sulfide is converted to sulfur, CO.sub.2 may be absorbed to produce a purified gas stream, and the reactant chelate is reduced. The process includes sulfur removal and regeneration of the reactant chelate.

Abstract: A cyclic process for the removal of hydrogen sulfide, and carbon dioxide, from a variety of gas streams is disclosed. The gas stream containing the sour gas(es) is contacted with an aqueous solution of a specific reactant ligand or chelate, or mixtures thereof, optionally in an absorbent, containing specific stabilizers for improvement of chelate life. The hydrogen sulfide is converted to sulfur, CO.sub.2 may be absorbed to produce a purified gas stream, and the reactant chelate is reduced. The process includes sulfur removal and regeneration of the reactant chelate.

Abstract: A cyclic process for the removal of hydrogen sulfide, and carbon dioxide, from a variety of gas streams is disclosed. The gas stream containing the sour gas(es) is contacted with an aqueous solution of a specific reactant ligand or chelate, or mixtures thereof, optionally in an absorbent, containing specific stabilizers for improvement of chelate life. The hydrogen sulfide is converted to sulfur, CO.sub.2 may be absorbed to produce a purified gas stream, and the reactant chelate is reduced. The process includes sulfur removal and regeneration of the reactant chelate.

Abstract: A cyclic process for the simultaneous removal of hydrogen sulfide and carbon dioxide from a variety of gas streams is disclosed. The gas stream containing the sour gases is contacted with a solution of the Fe(III) chelate of nitrilotriacetic acid in an absorbent comprising diethylene glycol monoethyl ether. The hydrogen sulfide is converted to sulfur, the CO.sub.2 is absorbed to produce a purified gas stream, and the Fe(III) chelate is converted to the Fe(II) chelate. The process includes sulfur removal and regeneration of the absorbent and the Fe(III) chelate.

Abstract: Hydrogen sulfide, carbon dioxide, and carbonyl sulfide are removed from a gas stream in a staged procedure characterized by absorption of the CO.sub.2 and COS and conversion of the hydrogen sulfide to produce sulfur in an absorbent mixture, hydrolysis of the carbonyl sulfide to produce a gas stream of hydrogen sulfide and carbon dioxide, and removal of the hydrogen sulfide from the gas stream.

Abstract: A cyclic process for the removal of hydrogen sulfide from a variety of gas streams is disclosed. The gas stream containing the sour gases is contacted with a solution of the Fe(III) chelate of nitrilotriacetic acid and a modifier having the formula C.sub.n H.sub.2n-1 OH, wherein n is a whole number from 4 through 22. The hydrogen sulfide is converted to sulfur, and the Fe(III) chelate is converted to the Fe(II) chelate. The process includes sulfur removal and regeneration of the Fe(III) chelate.

Abstract: A cyclic process for the removal of hydrogen sulfide, and carbon dioxide, from a variety of gas streams is disclosed. The gas stream containing the sour gases is contacted with an aqueous solution of specific reactant materials, optionally in an absorbent, containing specific dialcohols for reaction rate improvement. The hydrogen sulfide is converted to sulfur, CO.sub.2 may be absorbed to produce a purified gas stream, and the reactant material is reduced. The process includes sulfur removal and regeneration of the reactant.