TY - JOUR
T1 - Separation of CO2 from gas mixtures with liquid membranes
AU - Saha, S.
AU - Chakma, A.
PY - 1992/5
Y1 - 1992/5
N2 - Conventional ethanolamine based CO2 removal processes are not energy efficient. Separation by membranes may provide considerable energy savings over conventional processes. Ideally, to be economically competitive, a membrane should not only be highly permeable, it should also have higher selectivity for the component to be separated. However, permeability and selectivity of common polymeric membranes are, in general, inversely related. Mass flux as well as selectivity of permeation can be improved by employing reactive liquid films immobilized on a sheet of microporous filter as a substitute to solid polymeric membranes. Mixtures of various amines such as monoethanolamine (MEA), diethanolamine (DEA), and amino-methyl-propanol (AMP) and polyethylene glycol (PEG) were immobilized in a microporous polypropylene film and placed in a permeator. The permeabilities of CO2 and other hydrocarbon gases through the immobilized liquid membrane were measured under low pressure differential and isothermal conditions. The permeation characteristics and trans-membrane flux show favourable separation as compared to the conventional polymeric membrane. Separation factors as high as 145 were obtained. Environmental implications of the results for gas processing industry are discussed.
AB - Conventional ethanolamine based CO2 removal processes are not energy efficient. Separation by membranes may provide considerable energy savings over conventional processes. Ideally, to be economically competitive, a membrane should not only be highly permeable, it should also have higher selectivity for the component to be separated. However, permeability and selectivity of common polymeric membranes are, in general, inversely related. Mass flux as well as selectivity of permeation can be improved by employing reactive liquid films immobilized on a sheet of microporous filter as a substitute to solid polymeric membranes. Mixtures of various amines such as monoethanolamine (MEA), diethanolamine (DEA), and amino-methyl-propanol (AMP) and polyethylene glycol (PEG) were immobilized in a microporous polypropylene film and placed in a permeator. The permeabilities of CO2 and other hydrocarbon gases through the immobilized liquid membrane were measured under low pressure differential and isothermal conditions. The permeation characteristics and trans-membrane flux show favourable separation as compared to the conventional polymeric membrane. Separation factors as high as 145 were obtained. Environmental implications of the results for gas processing industry are discussed.
KW - CO separation
KW - facilitated transport
KW - liquid membranes
UR - http://www.scopus.com/inward/record.url?scp=0010351995&partnerID=8YFLogxK
U2 - 10.1016/0196-8904(92)90038-x
DO - 10.1016/0196-8904(92)90038-x
M3 - Article
AN - SCOPUS:0010351995
VL - 33
SP - 413
EP - 420
JO - Energy Conversion and Management
JF - Energy Conversion and Management
SN - 0196-8904
IS - 5-8
ER -
