Purification method of hydroxypropylmethyl cellulose phthalate

Details Purification method of hydroxypropylmethyl cellulose phthalate Purification method of hydroxypropylmethyl cellulose phthalate

2006-04-11

2006-04-11

Lewis, Patrick (Department: 1623)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C536S030000, C536S032000, C536S043000, C536S055300, C536S056000, C536S058000, C536S066000, C536S084000, C536S085000, C536S087000, C536S124000

Reexamination Certificate

active

07026471

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.

REFERENCES:
patent: 3629237 (1971-12-01), Koyanagi et al.
patent: 5047180 (1991-09-01), Steiner et al.
patent: 5750148 (1998-05-01), Maruyama et al.
patent: 160753 (1933-06-01), None

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