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:
Oct. 12, 2010
Filed:
Mar. 09, 2009
Pushpito Kumar Ghosh, Bhavnagar, IN;
Himanshu Labhshanker Joshi, Bhavnagar, IN;
Hasina Hajibhai Deraiya, Bhavnagar, IN;
Maheshkumar Ramniklal Gandhi, Bhavnagar, IN;
Rohit Harshadrai Dave, Bhavnagar, IN;
Kaushik Jethalal Langalia, Bhavnagar, IN;
Vadakke Puthoor Mohandas, Bhavnagar, IN;
Pushpito Kumar Ghosh, Bhavnagar, IN;
Himanshu Labhshanker Joshi, Bhavnagar, IN;
Hasina Hajibhai Deraiya, Bhavnagar, IN;
Maheshkumar Ramniklal Gandhi, Bhavnagar, IN;
Rohit Harshadrai Dave, Bhavnagar, IN;
Kaushik Jethalal Langalia, Bhavnagar, IN;
Vadakke Puthoor Mohandas, Bhavnagar, IN;
Council of Scientific & Industrial Research, New Delhi, IN;
Abstract
The present invention provides an improved process for the preparation of MgO of high purity >99% from salt bitterns via intermediate formation of Mg(OH)obtained from the reaction of MgCland lime, albeit indirectly, i.e., MgClis first reacted with NHin aqueous medium and the slurry is then filtered with ease. The resultant NHCl-containing filtrate is then treated with any lime, to regenerate NHwhile the lime itself gets transformed into CaClthat is used for desulphatation of bittern so as to recover carnallite and thereafter MgClof desired quality required in the present invention. The crude Mg(OH)is dried and calcined directly to produce pure MgO, taking advantage of the fact that adhering impurities in the Mg(OH)either volatilize away or get transformed into the desired product, i.e., MgO.