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:
Jun. 06, 2006
Filed:
Dec. 17, 2001
Tatsuya Andoh, Kawasaki, JP;
Junji Tanaka, Kawasaki, JP;
Keigo Watanabe, Iwakuni, JP;
Yasunori Nanri, Iwakuni, JP;
Makoto Nakao, Chiyoda-ku, JP;
Tatsuya Andoh, Kawasaki, JP;
Junji Tanaka, Kawasaki, JP;
Keigo Watanabe, Iwakuni, JP;
Yasunori Nanri, Iwakuni, JP;
Makoto Nakao, Chiyoda-ku, JP;
Kawasaki Kasei Chemicals Ltd., Tokyo, JP;
Nippon Paper Industries Co., Ltd., Tokyo, JP;
Abstract
A lignocellulose material is cooked by means of an alkaline cooking liquor containing polysulfides in the presence of a quinone-hydroquinone compound, of which the oxidation-reduction potential in the form present during the cooking, which potential is a value calculated as a standard oxidation-reduction potential (Ea) with a hydrogen ion activity of 1, is within a range of from 0.12 to 0.25V to the standard hydrogen electrode potential. It is thereby possible to cook the lignocellulose material with a low Kappa number and in good yield and at the same time, to reduce the amount of the chemical solution used and to reduce the load on a recovery boiler.