Method of treating natural gas to obtain a methane rich fuel gas

US4305733A · kind A · utility

Assignees

• Linde GmbH · DE
• Vniigaz · RU

Inventors

• Walter Scholz · Wolfratshausen, DE
• Gerhard Ranke · Pöcking, DE
• Hans Becker · Tönisvorst, DE
• Boris G. Bergo · Moskovskiy, RU
• Alexander I. Grizenko · Moskovskiy, RU
• Alexej V. Frolov · Moskovskiy, RU

Key dates

• Filing date: Mar 6, 1980
• Grant date: Dec 15, 1981
• Expiry date: Mar 6, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S62/928
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method for the recovery of a methane-rich natural gas from a natural gas containing, apart from methane, also hydrogen sulfide, carbondioxide, higher hydrocarbons and, in most cases, organosulfur compounds. According to the invention a hydrocarbon fraction of C.sub.4 hydrocarbons and higher is naturally removed from the natural gas which is then subjected to a selective scrubbing for the removal of hydrogen sulfide with a regeneratable extraction, of scrubbing liquid. Next a C.sub.3 fraction is removed, the remaining gas being scrubbed with a second regeneratable washing agent, for the removal of carbondioxide to leave the methane-rich gas.