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96396 CONTAMINATION AND PURIFICATION OF ALKALINE GAS TREATING SOLUTIONS

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Product Number: 51300-96396-SG
ISBN: 96396 1996 CP
Author: JOHN G. McCULLOUGH, RICHARD E . NIELSEN
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Alkanolamine and potassium carbonate solutions in gas treating units removing carbon dioxide, hydrogen sulfide, or both are contaminated by impurities in the feed gases and makeup water and by the products of the degradation and oxidation of amines occurring in the units themselves. Feed gas impurities include oxygen, carbonyl sulfide, carbon monoxide, hydrogen cyanide, ammonia, brine, solid particles, heavy hydrocarbons, sulfur dioxide, hydrochloric acid, organic acids, and pipeline corrosion inhibitors. Impure makeup water contans sulfate, chloride, alkali metal, and alkaline earth ions (hardness). Reactions causing contamination in the units include oxidation of hydrogen sulfide to sulfate and thiosulfate, oxidation of amines to formic acid and other products, and degradation of amines by carbon dioxide. The result is heat-stable salts and polymers reduce the gas absorbing capacity of a kanolamine solutions and increase their corrosiveness. Similar problems occur in potassium carbonate solutions, except that degradation protlucts of amine activators are Loo dilute to be harmful. Contaminants are removed by inlet gas separation, charcoal and mechanical filtration, neutralization of heat-stable salts, reclaiming at both atmospheric and redllced pressure, upstream washing of the feed gas, electrodialysis, use of antioxidants, ion exchange, and blowdown and dumping of the solution. Keywords: alkanolamine, amine, carbonate, carbon dioxide, contamination, degradation, foam, gas treating, heat-stable salts, hydrogen sulfide, impurities, purification.
Alkanolamine and potassium carbonate solutions in gas treating units removing carbon dioxide, hydrogen sulfide, or both are contaminated by impurities in the feed gases and makeup water and by the products of the degradation and oxidation of amines occurring in the units themselves. Feed gas impurities include oxygen, carbonyl sulfide, carbon monoxide, hydrogen cyanide, ammonia, brine, solid particles, heavy hydrocarbons, sulfur dioxide, hydrochloric acid, organic acids, and pipeline corrosion inhibitors. Impure makeup water contans sulfate, chloride, alkali metal, and alkaline earth ions (hardness). Reactions causing contamination in the units include oxidation of hydrogen sulfide to sulfate and thiosulfate, oxidation of amines to formic acid and other products, and degradation of amines by carbon dioxide. The result is heat-stable salts and polymers reduce the gas absorbing capacity of a kanolamine solutions and increase their corrosiveness. Similar problems occur in potassium carbonate solutions, except that degradation protlucts of amine activators are Loo dilute to be harmful. Contaminants are removed by inlet gas separation, charcoal and mechanical filtration, neutralization of heat-stable salts, reclaiming at both atmospheric and redllced pressure, upstream washing of the feed gas, electrodialysis, use of antioxidants, ion exchange, and blowdown and dumping of the solution. Keywords: alkanolamine, amine, carbonate, carbon dioxide, contamination, degradation, foam, gas treating, heat-stable salts, hydrogen sulfide, impurities, purification.
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