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. 19, 1996
Filed:
Aug. 05, 1993
Applicant:
Inventors:
Craig J Brown, Pickering, CA;
Michael A Sheedy, North York, CA;
Assignee:
Eco-Tec Limited, Pickering, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ;
U.S. Cl.
CPC ...
203 13 ; 203 12 ; 203 16 ; 203 35 ; 203 36 ; 203 37 ; 203 41 ; 203 42 ; 203 47 ; 203 84 ; 203 85 ; 203 94 ; 203 95 ; 203 98 ; 203100 ; 203D / ; 159D / ; 4233942 ; 423D / ;
Abstract
Volatile acids containing metal salt impurities, such as metal pickling solutions-are regenerated by a process in which the acid is subjected to sulfuric acid distillation. Resulting volatile acid vapor is condensed and recycled to the pickle tank, while the residual acid mixture is treated in an acid sorption unit, preferably of the acid retardation type. Acid sorbed in the acid sorption unit is periodically eluted with water and recycled, while metal impurities are rejected in a deacidified by-product solution.