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:
Nov. 22, 1983
Filed:
Sep. 30, 1982
John A Wojtowicz, Cheshire, CT (US);
Olin Corporation, New Haven, CT (US);
Abstract
A process for producing calcium hypochlorite from lime containing insoluble impurities comprises reacting the lime with an aqueous solution of hypochlorous acid to form a reaction mixture comprised of coarse dibasic calcium hypochlorite crystals and fine insolubles comprised of fine dibasic calcium hypochlorite crystals, insoluble impurities, and unreacted lime. Coarse dibasic calcium hypochlorite crystals are separated from the reaction mixture, leaving a slurry comprised of an aqueous calcium hypochlorite solution containing fine insolubles. The slurry of fine insolubles is separated and the resulting clarified aqueous calcium hypochlorite solution is used to wash occluded fine insolubles from the coarse dibasic crystals. The resulting wash solution is combined with fine insolubles and the resulting slurry is reacted with hypochlorous acid and filtered to remove insoluble lime impurities. The clarified solution is mixed with the washed coarse dibasic calcium hypochlorite crystals and then reacted with an aqueous solution of hypochlorous acid to produce hemibasic calcium hypochlorite. The resulting slurry is reacted with an alkali metal hydroxide and chlorine to form an aqueous paste of calcium hypochlorite dihydrate crystals. The paste is then dried to produce granular calcium hypochlorite by spray drying or spray graining. The hypochlorous acid is produced by reacting an aqueous solution of an alkali metal hydroxide in finely divided form with gaseous chlorine.