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:
Apr. 12, 1990
Applicant:
Inventor:
Daniel J Vaughan, Wilmington, DE (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
2041824 ; 204 96 ; 204 98 ; 204 97 ; 204151 ; 204116 ; 204118 ; 204121 ;
Abstract
An alkali hydroxide solution of a metal hydroxide or metallic oxide acidic is separated into a solid metal hydroxide or metallic oxide acidic and a solution of alkali hydroxide by feeding the alkali solution to an electrolyte comprising a soluble anion of an acid and controlling the pH of the electrolyte to insolubilize a metal hydroxide or metallic oxide acidic by electrotransporting alkali cations from the electrolyte through a cation permeable membrane into a catholyte and converting the alkali cations to a solution of alkali hydroxide. Sodium hydroxide etchants of aluminum containing sodium aluminate are continuously converted to aluminum hydroxide and a solution of sodium hydroxide.