Process and apparatus for making low molecular weight cellulose ethers
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United States of America Patent
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Jul 17, 2001
Grant Date -
Jul 5, 2001
app pub date -
Dec 1, 1998
filing date -
Dec 1, 1998
priority date (Note) -
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Abstract
There is a process for making a cellulose ether. The process comprises the following: a) alkalyzing a cellulose pulp; b) etherifying the alkalyzed cellulose pulp to form a cellulose ether; c) washing the cellulose ether; d) drying the cellulose ether; e) milling the cellulose ether to a particulate form; f) heating the particulate cellulose ether; g) tumbling the particulate cellulose ether while simultaneously contacting it with an acid to partially depolymerize it to a lower molecular weight; h) partially or substantially neutralizing the acid. There is also an apparatus for making the cellulose ether.
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