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.
准确控制
纤维素醚的聚合度,稳定
纤维素醚的质量和生产工艺。提供了一种生产聚合度可控的解聚碱
纤维素的方法,该方法至少包括一个步骤,即在含
氧气流存在的情况下,解聚通过使纸浆与碱溶液接触而获得的碱
纤维素,同时测量含
氧气流中
氧气的加入量和排出量。还提供了一种生产
纤维素醚的方法,该方法至少包括一个步骤,即向聚合度受控的解聚碱
纤维素中添加醚化剂。