Pressure swing adsorption product purity control method and appa

Details Pressure swing adsorption product purity control method and appa Pressure swing adsorption product purity control method and appa

1986-07-24

1987-09-15

Spitzer, Robert H.

Gas separation

Means within gas stream for conducting concentrate to collector

55 26, 55 62, 55 68, 55160, 55179, 55270, 55387, 55389, B01D 5304

Patent

active

046937307

ABSTRACT:
The present invention provides a method and apparatus for automatically controlling product purity in a pressure swing adsorption process without risking unacceptable impurity breakthrough as the feedstock changes, yet providing rapid response and high stability. The process comprises sensing a characteristic of the effluent from cocurrent depressurization, and taking corrective action responsive thereto. Any action can be taken which is effective to vary the impurity concentration in the product gas in the direction necessary to obtain desired product purity. Among the suitable corrective actions are the following: (1) adjusting the adsorption step time to control the impurity loading of each adsorbent bed; (2) adjusting the cocurrent depressurization termination pressure to control the impurity breakthrough at the product end of each adsorbent bed; and/or (3) adjusting the amount of purging gas received by each adsorbent bed to control the extent of regeneration.

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