The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2003
Filed:
Mar. 25, 2002
Richard W. Baker, Palo Alto, CA (US);
Ingo Pinnau, Palo Alto, CA (US);
Zhenjie He, Fremont, CA (US);
Andre R. Da Costa, Menlo Park, CA (US);
Ramin Daniels, San Jose, CA (US);
Karl D. Amo, Mountain View, CA (US);
Johannes G. Wijmans, Menlo Park, CA (US);
Membrane Technology and Research, Inc., Menlo Park, CA (US);
Abstract
A process for treating a gas mixture containing at least an organic compound gas or vapor and a second gas, such as natural gas, refinery off-gas or air. The process uses two sequential membrane separation steps, one using membrane selective for the organic compound over the second gas, the other selective for the second gas over the organic vapor. The second-gas-selective membranes use a selective layer made from a polymer having repeating units of a fluorinated polymer, and demonstrate good resistance to plasticization by the organic components in the gas mixture under treatment, and good recovery after exposure to liquid aromatic hydrocarbons. The membrane steps can be combined in either order.