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Title: Methane/nitrogen separation process

A membrane separation process for treating a gas stream containing methane and nitrogen, for example, natural gas. The separation process works by preferentially permeating methane and rejecting nitrogen. We have found that the process is able to meet natural gas pipeline specifications for nitrogen, with acceptably small methane loss, so long as the membrane can exhibit a methane/nitrogen selectivity of about 4, 5 or more. This selectivity can be achieved with some rubbery and super-glassy membranes at low temperatures. The process can also be used for separating ethylene from nitrogen.
Inventors:
 [1];  [2];  [1];  [3]
  1. (Palo Alto, CA)
  2. (Menlo Park, CA)
  3. (Mountain View, CA)
Issue Date:
OSTI Identifier:
871151
Assignee:
Membrane Technology and Research, Inc. (Menlo Park, CA) OAK
Patent Number(s):
US 5669958
Contract Number:
FG03-94ER81809
Research Org:
Membrane Technology and Research, Inc. (Menlo Park, CA)
Country of Publication:
United States
Language:
English
Subject:
methane; nitrogen; separation; process; membrane; treating; gas; stream; containing; example; natural; preferentially; permeating; rejecting; found; meet; pipeline; specifications; acceptably; loss; exhibit; selectivity; achieved; rubbery; super-glassy; membranes; temperatures; separating; ethylene; natural gas; separation process; gas stream; stream containing; membrane separation; nitrogen separation; containing methane; gas pipe; rejecting nitrogen; permeating methane; nitrogen selectivity; preferentially permeating; /95/62/