Converting to DEA/MDEA mix ups sweetening capacity

Michael L. Spears Union Pacific Resources Bryan, Tex. Kathy M. Hagan Union Pacific Resources Ft. Worth Jerry A. Bullin, Carl J. Michalik Bryan Research & Engineering Bryan, Tex. Mixing amines can be the best method for increasing capacity or improving efficiency in an amine sweetening unit. In many cases, it may be possible simply to add a second amine to the existing solution "on the fly," or as the unit is running. Union Pacific Resources' Bryan, Tex., gas plant provides one example. The plant was converted from diethanolamine (DEA) to a DEA/MDEA (methyl DEA) mixture after analysis by TSWEET, a process-simulation program. After conversion, CO2 levels in the sale...

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