Title:
セルロースアセテート、セルロースアセテートの製造方法および製造装置
Document Type and Number:
Japanese Patent JP6820858
Kind Code:
B2
Abstract:
An object is to provide a cellulose acetate remarkably good in hue even when a low-quality pulp is used. A method for producing the cellulose acetate includes a step (1) of crushing a wood pulp, a step (2) of bringing the crushed wood pulp into contact with acetic acid to subject the pulp to pretreat the wood pulp, a step (3) of causing the wood pulp to react with acetic anhydride after the pretreatment to acetylate the pulp, a step (4) of hydrolyzing the cellulose acetate, which is yielded by the acetylation, and a step (5) of precipitating the cellulose acetate, an acetylation degree of which is adjusted by the hydrolysis. In the hydrolyzing step (4), in a hydrolysis reaction system, a concentration of oxygen is set to 3% or less.
Inventors:
Akihiro Kuwana
Hiroaki Tamaki
Hiroaki Tamaki
Application Number:
JP2017544529A
Publication Date:
January 27, 2021
Filing Date:
October 05, 2016
Export Citation:
Assignee:
Daicel Corporation
International Classes:
C08B3/06
Domestic Patent References:
| JP9286801A | ||||
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Foreign References:
| WO2010023707A1 | ||||
| WO2007072643A1 |
Other References:
セルロースの事典,株式会社朝倉書店,2000年11月10日,p.476
Attorney, Agent or Firm:
Patent business corporation Yuko patent office