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:
May. 22, 2012
Filed:
Dec. 27, 2005
Parimal Paul, Gujarat, IN;
Pushpito Kumar Ghosh, Gujarat, IN;
Kaushik Jethalal Langalia, Gujarat, IN;
Palani Sivagnana Subramanian, Gujarat, IN;
Suresh Eringathodi, Gujarat, IN;
Subrata Patra, Gujarat, IN;
Pragati Agnihotri, Gujarat, IN;
Parimal Paul, Gujarat, IN;
Pushpito Kumar Ghosh, Gujarat, IN;
Kaushik Jethalal Langalia, Gujarat, IN;
Palani Sivagnana Subramanian, Gujarat, IN;
Suresh Eringathodi, Gujarat, IN;
Subrata Patra, Gujarat, IN;
Pragati Agnihotri, Gujarat, IN;
Council of Scientific & Industrial Research, New Delhi, IN;
Abstract
The present invention relates to a process for the recovery of sulphate of potash (SOP) from bittern. Kainite is obtained by fractional crystallization of the bittern. Kainite is converted into schoenite with simultaneous removal of NaCl and the filtrate (SEL) is used for production of KCl. Schoenite is reacted with aqueous KCl to yield SOP and the filtrate (KEL) is recycled in the kainite to schoenite conversion step. The production of KCl from SEL is carried out with the aid of dipicrylamine (DPA). Lime is treated with DPA in water for the production of highly soluble Ca (DPA)2, which in turn treated with SEL to produce insoluble K(DPA). K(DPA) is treated with HCl to produce KCl and insoluble DPA, which can be recycled for the production of Ca (DPA)2. The aqueous KCl thus obtained is treated with schoenite to prepare SOP. The KEL obtained along with SOP is recycled to generate schoenite.