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EXPERIMENTAL AND THEORETICAL STUDY ON H2/CO2 SEPARATION BY A FIVE-STEP ONE-COLUMN PSA PROCESS
Korean Journal of Chemical Engineering, November 1995, 12(5), 503-511(9), 10.1007/BF02705851
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Abstract
An experimental and theoretical study is performed for bulk separation of H2/CO2 mixture (70/30 volume%)by PSA process with zeolite 5A, a process widely used commercially in conjunction with the catalytic steam reforming of natural gas or naphtha. For the optimized adsorption. For the optimized adsorption conditions of PSA, the characteristics of adsorption/desorption characteristics have been studied through breakthrough and desorption experiments under various conditions. The purge-to-feed ratio is important to the H2 product purity only at a long adsorption step time. H2 could be concentra-ted from 70% in the feed to 99.99% at H2 recovery of 67.5%. The results of all five steps in PSA are successfully predicted by the LDF model considering an energy balance and nonlinear isotherm. For the model, the effective diffusivities(De) are obtained separately from the uptake curves of H2 and CO2. The Langmuir-Freundlich isotherm is used to correlate the experimental equilibrium data and is very well fitted to the results.
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