Methods for producing alkali cellulose and cellulose ether
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United States of America Patent
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Jun 21, 2016
Grant Date -
Aug 23, 2012
app pub date -
Feb 16, 2012
filing date -
Feb 21, 2011
priority date (Note) -
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Abstract
A degree of polymerization of cellulose ether is accurately controlled, and quality and a manufacturing process of the cellulose ether are stabilized. There is provided a method for producing depolymerized alkali cellulose having a degree of polymerization controlled, comprising at least a step of depolymerizing, in the presence of an oxygen-containing gas flow, alkali cellulose obtained by bringing a pulp into contact with an alkali solution, while measuring feeding and discharging amounts of oxygen in the oxygen-containing gas flow. There is also provided a method for producing cellulose ether, comprising at least a step of adding an etherifying agent to the depolymerized alkali cellulose having a degree of polymerization controlled.
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