Separation of CO.sub.2 and H.sub.2 S from hydrogen containing gas
First Claim
1. In a process for the removal of acidic components comprising CO2 and H2 S, from CO2 -rich, hydrocarbon-containing raw gas wherein the raw gas is scrubbed under pressure with a physical scrubbing medium selective for H2 S and COS as compared to CO2 and hydrocarbons, and the resultant loaded scrubbing medium is regenerated and reused, the improvement comprising subjecting dry raw gas to rectification to form a hydrocarbon-rich fraction containing acidic components, as rectification overhead product, and a fraction consisting essentially of acidic components, as rectification bottoms product;
- scrubbing said rectification overhead product in a first scrubbing column to absorb the acidic components in the physical scrubbing medium to form a first scrubbing column bottoms product;
vaporizing the rectification bottoms product;
withdrawing partially loaded scrubbing medium from said first scrubbing column and scrubbing the vaporized rectification bottoms product in a second scrubbing column with said partially loaded scrubbing medium to selectively absorb the sulfur-containing compounds to form a loaded scrubbing medium; and
discharging resultant scrubbed gas from the second scrubbing column as CO2 overhead product under pressure and essentially free of sulfur compounds.
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Accused Products
Abstract
For the purification of hydrocarbon-containing, e.g., methane raw gases containing H2 S and CO2, the raw gas is dried, and separated by rectification into a hydrocarbon-rich overhead fraction containing some H2 S and CO2 and into a bottom fraction consisting essentially of H2 S and CO2. The overhead product is freed, in a first scrubbing column, of the acidic components with a physical acting scrubbing medium selective for H2 S 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.
20 Citations
23 Claims
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1. In a process for the removal of acidic components comprising CO2 and H2 S, from CO2 -rich, hydrocarbon-containing raw gas wherein the raw gas is scrubbed under pressure with a physical scrubbing medium selective for H2 S and COS as compared to CO2 and hydrocarbons, and the resultant loaded scrubbing medium is regenerated and reused, the improvement comprising subjecting dry raw gas to rectification to form a hydrocarbon-rich fraction containing acidic components, as rectification overhead product, and a fraction consisting essentially of acidic components, as rectification bottoms product;
- scrubbing said rectification overhead product in a first scrubbing column to absorb the acidic components in the physical scrubbing medium to form a first scrubbing column bottoms product;
vaporizing the rectification bottoms product;
withdrawing partially loaded scrubbing medium from said first scrubbing column and scrubbing the vaporized rectification bottoms product in a second scrubbing column with said partially loaded scrubbing medium to selectively absorb the sulfur-containing compounds to form a loaded scrubbing medium; and
discharging resultant scrubbed gas from the second scrubbing column as CO2 overhead product under pressure and essentially free of sulfur compounds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- scrubbing said rectification overhead product in a first scrubbing column to absorb the acidic components in the physical scrubbing medium to form a first scrubbing column bottoms product;
Specification