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:
Dec. 10, 1991
Filed:
Oct. 31, 1990
Kanegafuchi Kagaku Kogyo Kabushiki Kaisha, Osaka, JP;
Abstract
A method for removing sulfate ions from an aqueous solution of an alkali metal chloride is disclosed, in which the aqueous solution of the alkali metal chloride containing sulfate ions and zirconium hydrous oxide are brought into contact with each other in a slurry form under acidic conditions to thereby cause the sulfate ions to be adsorbed to the zirconium hydrous oxide by an ion exchange reaction, the zirconium hydrous oxide adsorbing sulfate ions is separated from the aqueous solution and then dispersed in another aqueous liquid to thereby cause it to react with an alkali so as to cause sulfate ions to be desorbed into the aqueous liquid. According to this method, adsorption and desorption take place rapidly and efficiently.