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:
Apr. 26, 1988
Filed:
Oct. 14, 1986
Frederick P Chlanda, Rockaway, NJ (US);
Yu-Chih Chiao, Bridgewater, NJ (US);
Krishnamurthy N Mani, Basking Ridge, NJ (US);
Allied Corporation, Morris Township, Morris County, NJ (US);
Abstract
We have discovered an improved, energy efficient method for recovering and regenerating acid from a solution comprising acid and salt. The process comprises of the steps of supplying a solution comprising salt and a first concentration of acid to a first compartment of an electrodialysis apparatus comprising a first compartment and a second compartment, supplying a liquid comprising water to the second compartment, applying a direct current to the electrodialysis apparatus to form, in the first compartment, a first product comprising salt and a second concentration of acid, the second concentration of acid being less than the first concentration of acid, and, in the second compartment, a second product comprising water and enriched in acid by a proportionate amount, recovering the first product, recovering the second product, recovering acid from the first product using electrodialytic water splitting to convert at least a portion of the salt to a third product comprising acid, and recovering the third product. The process has particular utility for the recovery and regneration of mixed acids from spent pickle liquors containing free nitric acid and salts of an anion other than nitrate anion.