Process for separating higher hydrocarbons from natural or produced gas streams
Patent
·
OSTI ID:5322035
This patent describes a gas separation process. It comprises the steps of: passing a first gas mixture comprising methane as its major constituent, and further comprising at least one gas from the group consisting of ethane and heavier hydrocarbons, across the feed side of a membrane having a feed side and a permeate side. The membrane comprising a microporous support layer and an ultrathin permselective layer, and wherein the membrane has a selectivity for propane over methane of 8 or more; withdrawing from the permeate side a second gas mixture enriched in at least one gas from the group consisting of ethane and heavier hydrocarbons compared with the first gas mixture, wherein the ratio of the volume flows of the second gas mixture and the first gas mixture is less than about 27%, and the ratio of the concentration of the one gas in the second gas mixture and the first gas mixture is at least about 3; and withdrawing from the feed side a third gas mixture enriched in methane compared with the first gas mixture.
- Assignee:
- Membrane Technology and Research, Inc., Menlo Park, CA
- Patent Number(s):
- US 4857078
- Application Number:
- PPN: US 7139914A
- OSTI ID:
- 5322035
- Country of Publication:
- United States
- Language:
- English
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