Molecular sieve sorbents for kinetic separation of propane/propylene

The separation of propane–propylene mixtures is one of great industrial importance. It is also one of the most difficult and costly to achieve. In this work, the feasibility of using sorbents based on kinetic (due to differences in diffusion rates) or steric (due to size exclusion) effect for gas-ph...

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Bibliographic Details
Published in:Chemical engineering science 2000-10, Vol.55 (20), p.4525-4535
Main Authors: Padin, Joel, Rege, Salil U., Yang, Ralph T., Cheng, Linda S.
Format: Article
Language:English
Subjects:
Adsorption
AlPO 4-14
Applied sciences
Chemical engineering
Chemistry
Exact sciences and technology
General and physical chemistry
Kinetic separation
Mixed cation zeolite A
Propane/propylene separation
Solid-gas interface
Surface physical chemistry
π-complexation sorbents
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Summary:The separation of propane–propylene mixtures is one of great industrial importance. It is also one of the most difficult and costly to achieve. In this work, the feasibility of using sorbents based on kinetic (due to differences in diffusion rates) or steric (due to size exclusion) effect for gas-phase separation of propane–propylene was determined. Equilibrium isotherms and uptake curves were measured on NaA (4A), NaLiA, and AlPO 4-14 zeolites. All of the sorbents were capable of selectively adsorbing propylene over propane. PSA simulations were used to compare these sorbents against π-complexation sorbents such as AgNO 3/SiO 2. The best sorbents were AlPO 4-14 and AgNO 3/SiO 2. In both cases, over 99% propylene product purities could be obtained at reasonably high recoveries and throughputs.
ISSN:0009-2509
1873-4405
DOI:10.1016/S0009-2509(00)00099-3