| 摘要 |
<p>18 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 essentially 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 rectification 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.</p> |
