Separation of co.sub.2 and h.sub.2s from hydrocarbon...

F - Mech Eng,Light,Heat,Weapons – 25 – J

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F25J 3/02 (2006.01) B01D 53/14 (2006.01) C07C 7/11 (2006.01)

Patent

CA 1212035

18 ABSTRACT OF THE DISCLOSURE For the purification of hydrocarbon-containing, e.g., methane raw gases containing H2S and CO2, the raw gas is dried, and separated by rectification into a hydrocarbon-rich overhead fraction containing some H2S and CO2 and into a bottom fraction consisting essen- tially of H2S and CO2. The overhead product is freed, in a first scrubbing column, of the acidic components with a physical acting scrubbing medium selective for H2S and COS as against CO2, e.g., polyethylene glycol ether or toluene. The bottom product from the rectifi- cation step is vaporized and selectively desulfurized in a second scrubbing column with the same scrubbing medium, and the scrubbed gas from the second scrubbing column is discharged as CO2 under pressure.

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