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:
Dec. 21, 2006
Mitsuo Narita, Joetsu, JP;
Masaki Tabata, Joetsu, JP;
Atsushi Yoshida, Joetsu, JP;
Hiroshi Umezawa, Joetsu, JP;
Mitsuo Narita, Joetsu, JP;
Masaki Tabata, Joetsu, JP;
Atsushi Yoshida, Joetsu, JP;
Hiroshi Umezawa, Joetsu, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
The invention is a method for efficiently preparing alkali cellulose having a uniform alkali distribution therein. More specifically, the invention is a method for preparing alkali cellulose comprising steps of bringing pulp into continuous contact with an alkali metal hydroxide solution in a rotary feeder type contactor to generate a contact mixture, and draining the contact mixture; and a method for preparing cellulose ether comprising use of the alkali cellulose thus prepared; an apparatus for preparing alkali cellulose, comprising a rotary feeder comprising a cyclic housing comprising an inlet port and an outlet port, a cyclic contact drum being circularly rotatable along the housing in the housing and comprising a plurality of filter cells arranged in a circumferential direction, and a filtrate-discharging tube being disposed in a diameter direction inside of the cyclic contact drum and collecting the filtrate which has passed the filter, and a drainer for draining a cake discharged from the contactor.