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:
May. 10, 1994
Filed:
Feb. 19, 1993
Daniel J Vaughan, Wilmington, DE (US);
Other;
Abstract
Oxidation and reduction reactions are carried out in a continuous aqueous solution having an acidic part and an alkaline part formed by electrolysis and electrodialysis of an acidic electrolyte separated by a cation permeable membrane from an alkaline electrolyte containing a soluble anion of an acid whereby hydrogen ions are electrotransported from an acidic electrolyte through a cation permeable membrane into said alkaline electrolyte to form the acidic part. Reactions are carried out in the acidic or alkaline part or simultaneously or successively in the acidic and alkaline parts by adding reactants to said alkaline electrolyte and passing electricity through said electrolysis and electrodialytic process. Chromium.sup.+6 in the alkaline part is reduced to chromium.sup.+3 in the acidic part by addition of sulfur dioxide to the alkaline part and the chromium.sup.+3 is precipitated by hydroxyl ions in the alkaline part.