Technical paper
Selective Absorption Using Amines
The selective removal of H2S from gas streams containing CO2 has become of widespread interest as a means to reduce equipment sizes and operating cost. A selective absorption design capability has been added to the amine sweetening process simulation program, TSWEET. The program results agreed closely with selective absorption data using MEA at contact times of about 0.4 seconds. The program calculations also agreed with a 40% CO2 rejection measured in a DEA absorber operating at 11 psig and 2 seconds residence time per tray. A 6-ft diameter absorber using 15 wt% MDEA was also used for comparison. The calculated H2S in the sweet gas was well within the scatter of the data while the calculated CO2 rejection was about 10% high. The process simulation program accurately represents the selective absorption process including the influence of all process variables.
The selective removal of H2S from gas streams containing CO2 has become of widespread interest as a means to reduce equipment sizes and operating cost. A selective absorption design capability has been added to the amine sweetening process simulation program, TSWEET. The program results agreed closely with selective absorption data using MEA at contact times of about 0.4 seconds. The program calculations also agreed with a 40% CO2 rejection measured in a DEA absorber operating at 11 psig and 2 seconds residence time per tray. A 6-ft diameter absorber using 15 wt% MDEA was also used for comparison. The calculated H2S in the sweet gas was well within the scatter of the data while the calculated CO2 rejection was about 10% high. The process simulation program accurately represents the selective absorption process including the influence of all process variables.