METHODS FOR PRODUCING ALKALI CELLULOSE AND CELLULOSE ETHER

摘要

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.