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:
Mar. 30, 1993
Filed:
Dec. 02, 1991
Applicant:
Inventors:
Jeffery G Grierson, Angleton, TX (US);
Dorothy L Roerden, Lake Jackson, TX (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210638 ; 210644 ;
Abstract
A process and apparatus for making a low salt epoxide is disclosed. The process comprises feeding a halohydrin solution into one compartment of a dialysis cell separated from a hydroxide dialyzing solution in a second compartment by an anionic membrane. An effective hydroxide concentration gradient across the membrane induces hydroxyl ion exchange for excess anions from the halohydrin solution so that electroneutrality across the membrane can be maintained.