Vacuum swing adsorption process with vacuum aided internal rinse

Details Vacuum swing adsorption process with vacuum aided internal rinse Vacuum swing adsorption process with vacuum aided internal rinse

1988-10-25

1989-08-15

Hart, Charles

Gas separation

Means within gas stream for conducting concentrate to collector

55 58, 55 74, 55 75, B01D 5304

Patent

active

048570834

ABSTRACT:
The present invention is a continuous vacuum swing adsorption process for the fractionation of a multi-component feed gas mixture containing methane as a primary component and predominantly CO.sub.2 as a secondary component. Mulit-component feed gas is passed through a plurality of adsorption columns containing adsorbent beds which selectively retain the secondary components while the primary component is discharged from each column and collected as product. Carbon dioxide is desorbed from the adsorbent beds by a vacuum assisted internal rinse step wherein a pressurized first adsorption column is operatively connected to an evacuated second adsorption column causing CO.sub.2 and other secondary components to be countercurrently swept out of the first column and into the second column. Vacuum assisted internal rinsing of adsorption columns effectively replaces pump-driven rinse steps resulting in a substantial reduction in process power requirements. Additionally, process vacuum requirements are significantly reduced because an evacuated adsorption column is used as a vacuum source for internally rinsing another adsorption column.

REFERENCES:
patent: Re31014 (1982-08-01), Sircar
patent: 4077779 (1978-03-01), Sircar et al.
patent: 4790858 (1988-12-01), Sircar

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