Method for purifying amine gas sweetening systems by addition of CO.sub.2
AssigneeExxon Production Research Company
InventorsMichael E. Moir, William A. Rendall
Life of this patent
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Abstract
A method for removing dissolved solids or sludge from amine absorbing solutions for acidic gas in gas sweetening systems is provided comprising contacting a stream of regenerated absorbing solution with CO.sub.2 such that the sludge forms a precipitate and removing the precipitate from the absorbing solution. The stream of absorbing solution may then be returned to a regenerator for removal of CO.sub.2 or returned to the gas sweetening system with the regenerated absorbing solution.
Claims15
In a gas sweetening system which acid gas is removed from gas by an acid gas absorbing solution comprising amine, a process for removing sludge, formed as a reaction product of said absorbing solution and elemental sulfur, from said absorbing solution comprising:
- (a) contacting a stream generated absorbing solution with CO.sub.2 such that said sludge forms a precipitate;
- and
- (b) removing precipitate from said stream of absorbing solution.
In a gas sweetening system wherein CO.sub.2 and H.sub.2 S are removed from gas by an absorbing solution comprising a sterically hindered amine and a solvent, a process for removing sludge from said absorbing solution comprising:
- (a) contacting a stream of regenerated absorbing solution, wherein said stream comprises from about 0.001 to about 10 percent of said absorbing solution in said gas sweetening system, with CO.sub.2 such that said sludge forms a precipitate;
- and
- (b) removing said precipitate from said stream of absorbing solution.
In a gas sweetening system wherein CO.sub.2 and H.sub.2 S are removed from gas by an amine absorbing solution comprising 2-piperidine ethanol, sulfolane and water, a process for removing sludge from said absorbing solution comprising:
- (a) contacting a stream of regenerated absorbing solution, wherein said stream comprises from about 0.001 to about 1 percent of said absorbing solution in said gas sweetening system, with CO.sub.2 such that said sludge forms a precipitate;
- (b) diluting said stream of absorbing solution with water;
- and
- (c) removing said precipitate from said stream of absorbing solution by filtration.
Dependencies are inferred from the claim text.