Pressure buildup technique in pressure swing adsorption process

Details Pressure buildup technique in pressure swing adsorption process Pressure buildup technique in pressure swing adsorption process

1978-05-31

1982-04-27

Spitzer, Robert H.

Gas separation

Means within gas stream for conducting concentrate to collector

55 31, 55 33, 55 58, 55 68, 55 74, 55 75, B01D 5304

Patent

active

043268587

ABSTRACT:
In a pressure swing adsorption process for the separation of gases comprising the steps of passing crude gas under a superatmospheric adsorption pressure through a drying bed of H.sub.2 O-selective adsorbent to remove gaseous H.sub.2 O and then passing resultant H.sub.2 O-free gas sequentially through a separate and distinct zeolite-containing adsorbent bed for the removal of low-boiling impurities and the further steps of pressure release, desorption and pressure buildup to adsorption pressure, the improvement in the pressure buildup step which comprises introducing an H.sub.2 O-depleted gas obtained during said process to a point intermediate the drying bed and said zeolite-containing adsorbent bed and passing said H.sub.2 O-depleted gas into the drying bed in a countercurrent direction to the flow of crude gas and into the zeolite-containing adsorbent bed in a cocurrent direction to the flow of crude gas, and continuing said passing of said H.sub.2 O-depleted gas until the pressure buildup is at least 20% of the adsorption pressure.

REFERENCES:
patent: 3102013 (1963-08-01), Skarstrom
patent: 3221476 (1965-12-01), Meyer
patent: 3306841 (1967-02-01), Ward
patent: 3365859 (1968-01-01), Sandberg
patent: 3436839 (1969-04-01), Ellington
patent: 3636679 (1972-01-01), Batta
patent: 3719025 (1973-03-01), Heinze et al.
patent: 3796022 (1974-03-01), Simonet et al.
patent: 3923477 (1975-12-01), Armond et al.

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