Patent ID: 8017766
Filing Date: 2011-09-13
Classification: C08B

Abstract:
1. A method for preparing cellulose ether, comprising simultaneously feeding pulp powder and an aqueous alkali solution to a high speed disperser to continuously bring them into contact with each other to obtain alkali cellulose, wherein the high speed disperser comprises an agitating blade selected from the group consisting of a cylinder type with a pin, a cone type with a pin, a disc type with a pin, a cylinder type with a scraping blade and a disc type with a scraping blade, and stirs at a peripheral speed of 5 m/s or greater, and reacting the alkali cellulose with an etherifying agent; wherein the cellulose ether is selected from the group consisting of methyl cellulose (MC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxyethyl methyl cellulose (HEMC), and hydroxypropyl methyl cellulose (HPMC).