Methods for preparing alkali cellulose and cellulose ether
AssigneeShin-Etsu Chemical Co., Ltd.
InventorMitsuo Narita
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Abstract
Provided is a method for efficiently preparing alkali cellulose having a uniform alkali distribution. More specifically, provided are a methods for preparing alkali cellulose comprising a contact filtration step of bringing a pulp into contact with an alkali metal hydroxide solution on a moving filtration plane for vacuum filtration to collect a contact product remaining on the filtration plane, and a draining step of draining the contact product; and a method of preparing cellulose ether by using the alkali cellulose. Also provided is an apparatus for preparing alkali cellulose comprising a continuous horizontal vacuum filter type contactor.
Claims5
A method for preparing alkali cellulose, comprising:
- a contact filtration step of bringing a pulp into contact with an alkali metal hydroxide solution on a moving filtration plane for vacuum filtration to collect a contact product remaining on the filtration plane, and
- a draining step of draining the collected contact product to obtain a cake.
An apparatus for preparing alkali cellulose, comprising:
- a continuous horizontal vacuum filter type contactor comprising:
- a horizontal filtration plane moving in a horizontal direction,
- a pulp inlet for introducing pulp onto the moving filtration plane,
- a spray port for spraying an alkali metal hydroxide solution to the pulp thus introduced,
- a vacuum pump enabling vacuum suction of the moving filtration plane, and an outlet for collecting a contact product remaining on the filtration plane after bringing the pulp into contact with the alkali metal hydroxide solution on the moving filtration plane for vacuum filtration, and
- a drainer for draining the contact product collected from the outlet to obtain a cake.
Dependencies are inferred from the claim text.