Recovery and purification of hydrogen from refinery and petroche

Details Recovery and purification of hydrogen from refinery and petroche Recovery and purification of hydrogen from refinery and petroche

1987-03-11

1988-04-26

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

55 69, 62 20, F25J 300

Patent

active

047402229

ABSTRACT:
A hydrogen-containing inlet gas stream is countercurrently extracted with lean solvent to produce an overhead stream of at least 90% purity hydrogen and a bottoms stream of rich solvent which is flashed in one to a plurality of stages. The flashed gas from at least the first stage, after compression, is recycled to the extracting step. The flashed gases from the remaining stages are recovered as fuel gas. When a hydrogen purity of more than 95% is needed, a minor portion of the stripped solvent from the last flashing stage is regenerated in a distillation column to form very lean solvent which is fed to the top of the extractor column while the major portion of the stripped solvent is fed to its middle.

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"High CO.sub.2 -High H.sub.2 S Removal with Selexol Solvent", by John Sweny, 59th Annual GPA Convention; Mar. 17-19, 1980, Houston, Texas.
"Gas Absorption", as Chapter 8 in Mass Transfer Operations, by Treybal, McGraw-Hill Book Company, Second Edition, 1986, pp. 221-226 and 393-395.

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