Selectivity and separation factor for components during multicomponent membrane gas separation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F22%3A00358700" target="_blank" >RIV/68407700:21220/22:00358700 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Selectivity and separation factor for components during multicomponent membrane gas separation

Original language description

The membrane separation process offers a promising solution for syngas components separation and adjusting the ratio of the components. The multicomponent separation process is however complex and cannot be easily described. The presented study offers a comparison of ideal and real selectivities for three H2-CO-CO2 model mixtures containing 15-35 mol% H2, 35 mol% CO, and 30-50 mol% CO2. The mixtures were tested with total pressure drops 0.5-8 bar (retentate pressure from 2 to 10 bar with the permeate pressure levels of 1.2 bar, 2.5 bar, and 4 bar). The membrane module used in the study is a hollow fiber polyimide membrane module with 3000 hollow fibers with an inner diameter of 0.188 mm and a length of 290 mm with an active separation layer. The ideal selectivities for are α(H2/CO2) = 3.21 and α(CO2/CO) = 14.77. The experimental results show that with increasing stagecut, the selectivities drop to below 1.3 for H2/CO2 (40 % of the ideal selectivity) and to below 1.4 for CO2/CO (9.5 % of the ideal selectivity). Also, the selectivity decreases at a different rate for both different feed compositions and different permeate pressures. The H2/CO2 selectivity drops faster for lower permeate pressure, the CO2/CO selectivity drops faster for higher permeate pressure. The separation factors increase both for H2/CO2 and CO2/CO with increasing pressure differences. Also, with the lower permeate pressure (pP = 1.2 bar) both separation factors (for H2/CO2 and CO2/CO) increase at a greater rate.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20402 - Chemical process engineering

Project

<a href="/en/project/EF16_019%2F0000753" target="_blank" >EF16_019/0000753: Research centre for low-carbon energy technologies</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů