Selective removal of acid gases from a contaminated gas stream was studied using four amines (diethylenetriamine (DETA), diaminoethane (DAE), diethylamine (DEYA), and bis(2-ethylhexyl)amine (BEHA)) as immobilized liquids in a facilitated transport membrane. The effect of amine concentration, CO 2 partial pressure, and operating temperature on the permeance of CO 2 and CH 4 was investigated for each aqueous amine solution. The observed CO 2 permeance decreased with increasing CO 2 feed pressure, whereas the permeance of CH 4 remained constant for all tested amines. The permeance of CO 2 and the selectivity were in the order DETA > DAE > BEHA ≈ DEYA. This order is related to the number of nitrogen atoms per amine molecule, which can be correlated to loading capacity and consequently to amine reactivity with CO 2 . The permeance of CO 2 in 2 M DETA increased with increasing temperature. The permeance of CO 2 using DETA was about 4 times that obtained using diethanolamine (DEA) and monoethanolamine (MEA), which are the most commonly used solvents in industrial applications.
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Al-Marzouqi et al. (2005) studied this question.
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