Back to results
US 5,669,960 AGranted
Hydrogen generation process
AssigneePraxair Technology, Inc.
InventorMichael Robert Couche
Life of this patent
Estimating the term…
Abstract
A process for the production of hydrogen that purifies a synthesis gas stream, containing hydrogen, carbon monoxide and combustibles, in a PSA unit. The PSA unit produces at least three streams: a substantially pure hydrogen product stream, a combustible-rich first tail-gas stream, and a carbon dioxide-rich second tail gas stream.
Claims17
A process for the production of H.sub.2 comprising:
- (a) providing a synthesis gas stream, containing H.sub.2, CO.sub.2 and combustibles to a PSA unit;
- (b) purifying the synthesis gas stream in the PSA unit to remove CO.sub.2 and to produce at least three streams:
- (1) a H.sub.2 product stream, (2) a combustible-rich first tail gas stream and (3) a combustible-lean second tail gas stream;
- wherein no additional CO.sub.2 removal step is required in the process for the production of the three streams of step (b) and wherein the combustible lean second tail gas contains at least 90 mole % CO.sub.2.
1 more element
A process for the production of H.sub.2 comprising:
- (a) using a synthesis gas generator to produce a synthesis gas stream from a feed gas comprising H.sub.2, CO, CO.sub.2, CH.sub.4, N.sub.2, Ar and water;
- (b) cooling the synthesis gas;
- (c) converting the CO in the synthesis gas to CO.sub.2 in a water-gas shift converter to produce a PSA feed gas;
- (d) removing heat from the PSA feed gas;
- (e) purifying the PSA feed gas in a dual-tail gas PSA unit to produce three streams, a H.sub.2 product stream, a combustible-rich first tail gas stream comprising unrecovered H.sub.2 and all the CO and CH.sub.4 from the PSA feed, and a combustible-lean second tail gas stream comprising most of the CO.sub.2 and water from the PSA feed;
- wherein no additional CO.sub.2 removal step is required to produce the three streams of step (e).
3 more elements
Dependencies are inferred from the claim text.