Uop Lcc

Union Carbide Corporation

Daniel J Kubek

John G McCullough

Kenneth J Barr

Kenneth F Butwell

Alexander J Kosseim

Joseph A Faucher

Debra S Kovach

A novel alkanolamine gas treating composition and method for purifying a gas stream containing acid gas impurities. The composition consists essentially of an alkanolamine solvent in an aqueous solution with antimony wherein said alkanolamine solvent includes at least about 1% by weight of methydiethanolamine (MDEA) and at least about 5% monoethanolamine (MEA) by weight of the total solution, and with said antimony present in a concentration of at least about 100 ppm. The combination of antimony and MDEA inhibits corrosion and retards solvent degradation.

Alkanolamine gas treating composition and process

Absorption of carbon dioxide from gas mixtures with aqueous absorbent solutions of tertiary alkanolamines is improved by incorporating at least one alkyleneamine in the solution. The presence of the alkyleneamine promotes the rate of carbon dioxide absorption and the carbon dioxide capacity of the aqueous tertiary alkanolamine solution. As a result, absorption can be carried out in shorter absorber columns, and process energy requirements can be lowered by reducing the rate at which the absorbent solution is circulated.

Tertiary alkanolamine absorbent containing an ethyleneamine promoter and

In an alkanolamine gas treating process for removing acid gas from a feedstream in which hydrogen sulfide is present, reduced corrosion of steel parts or components is observed when solution concentrations of hydrogen sulfide and vanadium in the plus five valence state are maintained above certain minimum levels.

Alkanolamine gas treating process for a feedstream containing hydrogen

A continuous process for acid gas removal from process gas streams by contact with an aqueous alkanolamine solution such as MEA wherein the temperature of the MEA solution is controlled by placing an intercooler at the lower end of the absorption column such that the temperature of the down-coming MEA solution is cooled to allow increased mole loading of acid gas in the solution, but is not so cooled that the mass transfer rate of the acid gas from the process gas to the MEA solution is slowed to an unacceptable level. The lower temperature highly loaded MEA solution is then passed to a heat exchanger-flash-heat exchanger arrangement where the temperature is increased to provide satisfactory flash efficiency and then heated again prior to introduction into the stripper to reduce the sensible heat duty in the stripper. The combination of optimally positioned intercooler and flash together with the temperature ranges recited permit the obtainment of a net energy demand lower than can be expected from the addition of the intercooler effect and the flash effect.

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Greenburgh, NY, United States of America

Daniel J Kubek