Process for producing cellulose derivatives of high bulk density and good flowability

摘要

A particulate cellulose derivative is obtained in a process of grinding and drying a moist cellulose derivative wherein
A) a cellulose derivative having a moisture content of from 60 to 95 percent, based on the total weight of the moist cellulose derivative, is provided,B) the moist cellulose derivative is dried and partially ground in a gas-swept impact mill; andC) the ground and partially dried cellulose derivative is contacted with an additional amount of a drying gas outside the gas-swept impact mill.;The obtained particulate cellulose derivative has a high untapped bulk density and a good flowability.

主权项

1. A process for producing a particulate cellulose derivative by grinding and drying a moist cellulose derivative using a drying gas stream, comprising the steps of
A) providing a moist cellulose derivative having a moisture content of from 60 to 95 percent, based on the total weight of the moist cellulose derivative, B) grinding and partially drying the moist cellulose derivative in a gas-swept impact mill into which a first drying gas stream is fed; and C) contacting the ground and partially dried cellulose derivative with a second drying gas stream outside the gas-swept impact mill, wherein the cellulose derivative is suspended in the entire amount or in at least a portion of the first drying gas stream exiting the gas swept impact mill when the cellulose derivative is contacted with the second drying gas stream outside the gas-swept impact mill to produce the particulate cellulose derivative.