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:
Apr. 26, 2005
Filed:
Jan. 06, 2003
Hirohisa Kikuyama, Osaka, JP;
Toshirou Fukudome, Osaka, JP;
Masahide Waki, Osaka, JP;
Hirofumi Yazaki, Osaka, JP;
Hirohisa Kikuyama, Osaka, JP;
Toshirou Fukudome, Osaka, JP;
Masahide Waki, Osaka, JP;
Hirofumi Yazaki, Osaka, JP;
Stella Chemifa Kabushiki Kaisha, Osaka, JP;
Abstract
A method of purifying lithium hexafluorophosphate that allows to purify lithium hexafluorophosphate, useful as lithium secondary cell electrolyte, organic synthesis medium or the like, to an extremely high purity is provided. Lithium hexafluorophosphate containing harmful impurities such as oxyfluoride, lithium fluoride is purified by adding phosphoric chloride. The purification is performed in the presence of phosphoric chloride and hydrogen fluoride of the quantity equal or superior to the equivalent amount for reacting them, and then by converting lithium fluoride lithium hexafluorophosphate with generated phosphor pentafluoride.