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Title: Contamination and purification of alkaline gas treating solutions

Abstract

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 contains 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 resulting heat-stable salts and polymers reduce the gas absorbing capacity of alkanolamine solutions and increase their corrosiveness. Similar problems occur in potassium carbonate solutions, except that degradation products of amine activators are too 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 reduced pressure, upstream washing of the feed gas, electrodialysis, use of antioxidants, ion exchange, and blowdown and dumping of the solution.

Authors:
 [1];  [2]
  1. Proton Technology Ltd., Hawthorne, NY (United States)
  2. Fluor Daniel, Inc., Irvine, CA (United States)
Publication Date:
OSTI Identifier:
271990
Report Number(s):
CONF-960389-
TRN: IM9635%%417
Resource Type:
Conference
Resource Relation:
Conference: National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Corrosion/96 conference papers; PB: [6615] p.
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; NATURAL GAS PROCESSING PLANTS; PROCESS SOLUTIONS; REGENERATION; IMPURITIES; ACTIVATED CARBON; FILTERS; SEPARATION PROCESSES; AMINES; POTASSIUM CARBONATES; POLLUTION SOURCES; FEEDWATER; CORROSION PRODUCTS

Citation Formats

McCullough, J G, and Nielsen, R B. Contamination and purification of alkaline gas treating solutions. United States: N. p., 1996. Web.
McCullough, J G, & Nielsen, R B. Contamination and purification of alkaline gas treating solutions. United States.
McCullough, J G, and Nielsen, R B. Thu . "Contamination and purification of alkaline gas treating solutions". United States.
@article{osti_271990,
title = {Contamination and purification of alkaline gas treating solutions},
author = {McCullough, J G and Nielsen, R B},
abstractNote = {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 contains 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 resulting heat-stable salts and polymers reduce the gas absorbing capacity of alkanolamine solutions and increase their corrosiveness. Similar problems occur in potassium carbonate solutions, except that degradation products of amine activators are too 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 reduced pressure, upstream washing of the feed gas, electrodialysis, use of antioxidants, ion exchange, and blowdown and dumping of the solution.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {8}
}

Conference:
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