| abstract |
PROBLEM TO BE SOLVED: To produce a cellulose ether having a high degree of substitution, a relatively small amount of metal atoms contained, and capable of recovering and reusing a medium by using a relatively small number of alkalis relative to a hydroxyl group. Is to provide. An etherifying agent is added to a cellulose solution or dispersion (A) containing an amine (a1) or a quaternary ammonium salt (a2), an ionic liquid (b), water (c) and cellulose (d). A method for producing a cellulose ether comprising the step of adding (e) to etherify cellulose, wherein (A) is an amine (a1) or a quaternary ammonium salt (a2) based on the weight of (A) 1 to 31 wt%, ionic liquid (b) 11 to 91 wt%, water (c) 6 to 65 wt% and (d) 1 to 20 wt%. . [Selection figure] None |