Hydrogen manufacture

Claim 2

A process as in claim 1 wherein the raw, hydrogen-rich gas is compressed to a pressure between 1,200 and 2,000 psig.

Claim 3

A process for obtaining high pressure, high purity hydrogen which comprises: a. generating a hydrogen-rich gas comprising hydrogen, carbon dioxide and carbon monoxide and containing sufficient carbon dioxide so that the molecular weight of the hydrogen-rich gas is at least four, b. centrifugally compressing the hydrogen-rich gas to a pressure above 900 psig to obtain high pressure hydrogen-rich gas, c. removing carbon dioxide from the high pressure hydrogen-rich gas by low temperature absorption of carbon dioxide into a methanol absorbent chilled to between 0* F. and minus 120* F. to obtain low-temperature hydrogen-rich carbon dioxide-lean gas at a temperature between minus 100* F. and 32* F., and containing between 0.5 and 4.0 volume percent carbon monoxide, and d. removing carbon monoxide from the low temperature hydrogen-rich gas at a temperature between minus 100* F. and minus 200* F. by carbon monoxide adsorption using a carbon monoxide adsorbent selected from the group consisting of charcoal, sodium zeolite X, sodium zeolite A, or silica gel, to obtain high purity hydrogen gas containing less than 0.01 volume percent carbon monoxide.

Claim 4

A process as in claim 4 wherein sufficient carbon monoxide is removed from the hydrogen-rich gas by carbon monoxide adsorption to obtain a high purity hydrogen gas containing less than 0.005 volume percent carbon monoxide.