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:
Jan. 17, 2012
Filed:
Nov. 14, 2006
Subhas K. Sikdar, Cincinnati, OH (US);
John O. Burckle, Cincinnati, OH (US);
Binay K. Dutta, Petronas, MY;
Alberto Figoli, Lappano, IT;
Enrico Drioli, Naples, IT;
Subhas K. Sikdar, Cincinnati, OH (US);
John O. Burckle, Cincinnati, OH (US);
Binay K. Dutta, Petronas, MY;
Alberto Figoli, Lappano, IT;
Enrico Drioli, Naples, IT;
The United States of America as represented by the Environmental Protection Agency, Washington, DC (US);
Abstract
Using the methods of the invention, an elastomeric polymer is dissolved in a suitable solvent, cast in one of the membrane casting techniques using a phase inversion technique, and immersed in a coagulation bath comprised of suitable solvent/non-solvent pairs (e.g., THF/water and ethanol). Asymmetric membranes having a dense discriminating layer and a thicker porous support layer suitable for application in pervaporation processes were obtained in a single step. An increase of the polymer concentration in the casting solution gives a more dense layer. When cast as formed using the methods of the invention, the membrane obtained is an integrally skinned membrane comprising a thin, dense separation layer over a porous support layer (asymmetric membrane) formed in a single casting operation. The resulting membrane is homogenous with respect to chemical composition.