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:
Jul. 31, 1984
Filed:
Feb. 26, 1982
Robert Karger, Dortmund, DE;
Abstract
Treatment of waste water containing chlorides comprising treatment with Ca (OH).sub.2 or CaCO.sub.3 to convert the chlorides to CaCl.sub.2, adding sulfuric acid to said water in a reaction vessel to produce hydrochloric acid and gypsum, circulating the mixture in a closed cycle between the reaction vessel and a distillation column for the extractive distillation of the resulting hydrochloric acid, and filtering out the accumulating gypsum sludge from the treated waste water, wherein the added amount of waste water amount of hydrochloric acid correspond to the amount of sludge exiting the reaction vessel or the amount of distillate removed from the distilling column and the amount of gypsum separated, and the hydrochloric acid concentration in the liquid is less than the maximum azeotropic concentration for a mixture of H.sub.2 O and HCl.