Process for treating industrial gas stream

Details Process for treating industrial gas stream Process for treating industrial gas stream

1980-11-13

1982-06-01

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 28, 62 29, 55 68, 55 73, F25J 302

Patent

active

043325980

ABSTRACT:
This invention relates to a method for producing a hydrogen stream and a carbon dioxide stream from a mixed gas feedstock containing hydrogen, carbon dioxide, and contaminant sulfur compounds. The method comprises scrubbing the gas feedstock with a carbon dioxide laden solvent in an initial scrubbing zone under conditions such that not more than 70% of the carbonyl sulfide in the feedstock is removed in the initial zone, physically scrubbing the initially scrubbed feedstock with a solvent under conditions sufficient for removing substantially all the carbon dioxide and carbonyl sulfide therefrom to leave a pure hydrogen stream desorbing carbon dioxide and carbonyl sulfide and other gases from the liquid from the second scrubbing zone and then fractionating the resultant carbon dioxide stream containing hydrogen, carbon oxides, etc. to produce said carbon dioxide stream for use in urea synthesis.

REFERENCES:
patent: 3417572 (1968-12-01), Pryor
patent: 3498067 (1970-03-01), Ranke
patent: 3910777 (1975-10-01), Jakob
patent: 3918934 (1975-11-01), Kriebel et al.
patent: 4052176 (1977-10-01), Child et al.
patent: 4152129 (1979-05-01), Trentham
patent: 4242108 (1980-12-01), Nicholas et al.

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