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Cascaded Membrane Processes for Post‐Combustion CO 2 Capture
Author(s) -
Zhao L.,
Riensche E.,
Weber M.,
Stolten D.
Publication year - 2012
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201100462
Subject(s) - flue gas , membrane , cascade , fugacity , combustion , energy consumption , chemistry , pipeline (software) , process engineering , waste management , materials science , chemical engineering , analytical chemistry (journal) , engineering , chromatography , mechanical engineering , organic chemistry , electrical engineering , biochemistry
CO 2 fugacity difference is the driving force for CO 2 ‐selective membranes used in post‐combustion capture. The ambient pressure of the flue gas makes it very difficult to use only a single membrane stage to achieve the CO 2 purity required by pipeline transport and storage, e.g., 95 mol.‐%. On the basis of a general multi‐stage membrane concept, an energy‐efficient membrane cascade is developed. The correlation of energy consumption and membrane area of a cascaded membrane process is investigated, considering 50 %, 70 %, and 90 % degree of CO 2 separation. In addition to an idealized flue gas consisting of N 2 and CO 2 only, also a quasi‐real flue gas is studied. Pressure loss in membrane modules and their influence on process energy consumption are discussed.