MEMBRANE PERMEATION TREATMENT WITH ADJUSTMENT OF THE TEMPERATURE OF THE FIRST RETENTATE AS A FUNCTION OF THE CH4 CONCENTRATION IN THE THIRD AND/OR FOURTH PERMEATE

摘要

A facility and method for membrane permeation treatment of a feed gas flow containing at least methane and carbon dioxide that includes a compressor, a pressure measurement device, at least one valve, and first, second, third, and fourth membrane separation units for separation of CO₂ from CH₄ to permeates enriched in CO₂ and retentates enriched in CH₄, respectively. A temperature of the first retentate is adjusted at an inlet of the second membrane separation unit with at least one heat exchanger as a function of the measured CH₄ concentration in such a way so as to reduce the determined difference.