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:
Aug. 22, 1978
Filed:
Nov. 09, 1977
Applicant:
Inventor:
Cheng H Lee, Creve Couer, MO (US);
Assignee:
Monsanto Company, St. Louis, MO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210 / ; 210 / ; 2105 / ;
Abstract
Methanol is separated from formaldehyde aqueous mixtures by contacting the aqueous mixture feed with a first surface of a polymeric membrane selectively permeable to the methanol over the formaldehyde or formaldehyde and water; while maintaining a second and opposite membrane surface at a lower chemical potential than the first membrane surface for the methanol permeating a portion of the methanol into and through the membrane, and withdrawing from the second membrane surface a mixture having a higher total concentration of methanol in relationship to the formaldehyde or formaldehyde and water than in the methanol, formaldehyde aqueous feed mixtures.