Alkanolamines for Hydrogen Sulfide and Carbon Dioxide Removal

Alkanolamines for Hydrogen Sulfide and Carbon Dioxide Removal 

Monoethanolamine, 49 Monoethanolamine-Glycol Mixtures, 50 Diethanolamine, 50 Diglycolamine, 51 Diisopropanolamine, 53 Methyidiethanolamine, 53 Mixed Amines, 54 Sterically Hindered Amines, 56 Amine Concentration, 56 

Acid Gas-Amine Solution Equilibria, 62 Amine Solution Vapor Pressures, 91 Heats of Reaction, 91 Physical Properties, 98 

Credit for the development of alkanolamines as absorbents for acidic gases goes to R. R. Bottoms (1930), who was granted a patent covering this application in 1930. Triethanolamine (TEA), w hich was the first alkanolamine to become commercially available, was used in the early gas-treating plants. As other members of the alkanolamine family were introduced into the market, they were also evaluated as possible add-gas absorbents. As a result, sufficient data are now available on several of the alkanolamines to enable design engineers to choose the most suitable compound for each particular requirement. 

A different class of acid gas absorbents, the sterically hindned amines, has recently been disclosed by EXXON Research and Engineering Company (Anon., 1981 Goldstein, 1983 Sartori and Savage, 1983). These absorbents, some of which are not alkanolamines, use steric hindetance to control the C02/amine reaction. Several different solutions are offered under the general name of Flexsorb solvents. 

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Kohl, A. L. Riesenfeld, F.C. 1997, Alkanolamines for Hydrogen Sulfide and Carbon Dioxide Removal Gas Purification Houston, TX, 5, 99. 

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