Process for the acid-catalyzed, hydrolytic depolymerization of cellulose ethers
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United States of America Patent
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Issued Date -
Sep 6, 2001
app pub date -
Mar 1, 2001
filing date -
Mar 1, 2000
priority date (Note) -
Abandoned
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Abstract
In the process according to the invention, the cellulose ether to be depolymerized is depolymerized in the form of an acid slurry in an apparatus which consists of an acid-resistant material and is provided with an inlet and outlet, where the inlet and outlet are separated from one another by a filter element, at a temperature above the flocculation temperature of the depolymerized cellulose ether in the space between the inlet and the filter element, subsequently neutralized and then separated from the filtrate by releasing the filtrate, which, in contrast to the cellulose ether, is not retained by the filter element. If necessary, this can be followed by purification and drying of the cellulose ether.
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