Process for producing cellulose ether by directly separating and recovering diluent

The invention discloses a process for producing cellulose ether by directly separating and recovering diluent, which comprises the following steps: adding sodium hydroxide and refined cottons into a mixed diluent system to carry out alkalization reaction; then adding etherifying agent into the obtained mixture to carry out etherification reaction, after the etherification reaction is completed, obtaining a mixed slurry of cellulose ether and organic diluent; and then recycling the organic diluent, and washing and refining the separated cellulose ether so as to obtain a finished product. The process is characterized in that the mixed slurry obtained in the step of etherification reaction is pumped to a centrifugal machine to carry out solid-liquid separation directly; then the obtained liquid mainly comprising the diluent enters into a settling tank to carry out gravity settling, and the obtained liquid subjected to gravity settling is directly used as diluent for recycling; and the obtained solid enters into