Process for producing cellulose derivatives of high bulk density, good flowability and/or dispersibility in cold water as well as low solution color
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United States of America Patent
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May 17, 2016
Grant Date -
Aug 27, 2015
app pub date -
Sep 23, 2013
filing date -
Sep 25, 2012
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Abstract
A particulate cellulose derivative is obtained in a process of grinding and drying a moist cellulose derivative which comprises the steps of A) providing a 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; C) contacting the ground and partially dried cellulose derivative with an additional amount of a drying gas outside the gas-swept impact mill; and D) subjecting the cellulose derivative to partial depolymerization after having contacted the cellulose derivative with a drying gas in step C). The obtained particulate cellulose derivative has a high untapped bulk density, a good flowability and a low color intensity.
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