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. 21, 2014
Filed:
Feb. 16, 2010
Shoichi Miyawaki, Tokyo, JP;
Shiho Katsukawa, Tokyo, JP;
Hiroshi Abe, Tokyo, JP;
Yuko Iijima, Tokyo, JP;
Akira Isogai, Tokyo, JP;
Shoichi Miyawaki, Tokyo, JP;
Shiho Katsukawa, Tokyo, JP;
Hiroshi Abe, Tokyo, JP;
Yuko Iijima, Tokyo, JP;
Akira Isogai, Tokyo, JP;
Nippon Paper Industries Co., Ltd., Tokyo, JP;
Abstract
An effluent produced in oxidation of a cellulosic material with an oxidizing agent in the presence of an N-oxyl compound and a bromide and/or iodide is deionized by electrodialysis to an inorganic salt concentration of less than 0.4%, whereby the N-oxyl compound in the effluent is concentrated and recovered. The N-oxyl compound thus recovered can be reused in oxidation of a cellulosic material. Preferably, the effluent is subjected to reduction treatment and ion exchange resin treatment prior to the electrodialysis.