The present invention relates to a method for producing an alkali cellulose with suppressed decrease in the degree of polymerization as well as with small use amount of a basic compound, and to a method for producing a cellulose ether by using the alkali cellulose thus obtained. Provided by the present invention are: (A) a method for producing an alkali cellulose, comprising Step 1 wherein a cellulose-containing raw material is pulverized in the presence of 0.6 to 1.5 mol of a basic compound relative to 1 mol of an anhydroglucose unit that constitutes a cellulose in the said cellulose-containing raw material and under the condition in which the water content therein relative to the cellulose in the cellulose-containing raw material is 10% or less by mass thereby obtaining a cellulose powder mixture having the median diameter of the cellulose-containing raw material made 150 µm or less and Step 2 wherein water content therein is adjusted in the range of 30 to 100% by mass relative to the cellulose by adding water to the cellulose powder mixture thereby obtaining the alkali cellulose in the powder form; and (B) a method for producing a cellulose ether by reacting the alkali cellulose produced by the foregoing production method with an etherification agent.
本发明涉及一种生产碱
纤维素的方法,该方法可抑制聚合度的降低,且碱性化合物的使用量较小,还涉及一种使用由此获得的碱
纤维素生产
纤维素醚的方法。本发明提供了(A) 一种生产碱
纤维素的方法,包括步骤 1,其中含
纤维素的原料在 0.6 至 1.5摩尔的碱性化合物(相对于1摩尔的构成所述含
纤维素原料中
纤维素的脱
水葡萄糖单元)的条件下,并在其中相对于含
纤维素原料中
纤维素的
水含量为10%或更少(以质量计)的条件下,粉碎含
纤维素原料,从而获得
纤维素粉末混合物,其
纤维素-含
纤维素原料的中值直径为150微米或更少(以质量计)。步骤 2,通过向
纤维素粉末混合物中加
水,将其中的
水含量调整至相对于
纤维素的质量百分比为 30%至 100%的范围内,从而获得粉末状的碱
纤维素;(B) 通过将上述生产方法生产的碱
纤维素与醚化剂反应生产
纤维素醚的方法。