Purification method of hydroxypropylmethyl cellulose phthalate
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United States of America Patent
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Apr 11, 2006
Grant Date -
Aug 5, 2004
app pub date -
Apr 2, 2002
filing date -
Apr 19, 2001
priority date (Note) -
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Abstract
The present invention relates to a purification method of hydroxypropylmethyl cellulose phthalate, more particularly to a method of preparing high-purity hydroxypropylmethyl cellulose phthalate through a simple crushing process which comprises: increasing fluidity of reaction product mixture by adding fluidization solvent as a post-treatment process; and spraying it into water through a spray nozzle. As a result, formation of fine granular hydroxypropylmethyl cellulose phthalate particles prevents inter-particle coagulation during the a post-treatment process, and phthalic anhydride reactant, free phthalic acid and remaining acetic acid solvent can be removed effectively.
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