Purification of cellulose ether reaction product
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United States of America Patent
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Oct 21, 1980
Grant Date -
N/A
app pub date -
Mar 5, 1979
filing date -
Mar 5, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the preparation of organosoluble cellulose ethers, the content of alkali metal (hydroxides and the salts thereof) in the resulting cellulose ether is reduced by forming a solution of the cellulose ether and an organic solvent, converting the alkali metal hydroxide therein to an alkali metal salt and heating the resulting solution at conditions sufficient to (1) increase the size of the alkali metal salt particles and (2) remove any water therefrom. Filtering the resulting mixture and drying the filtrate yields a cellulose ether containing a very small percentage of alkali metal salt, e.g., often less than about 500 ppm.
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