Production process of high-purity hypromellose phthalate for photoresist

Abstract

The invention discloses a production process of high-purity hypromellose phthalate for photoresist. The production process comprises the following steps of: a, heating and homogenizing raw materials including cellulose ether, acetic anhydride, glacial acetic acid, phthalic anhydride and succinic anhydride; b, in the process of adding a proper amount of catalyst, adding a raw material sodium acetate to obtain a mixture; and c, heating the mixture to 60-85 DEG C, and carrying out a constant temperature reaction. According to the invention, dust generated in the crushing step can be absorbed to reduce dust overflow and the influence of the dust on workers; under the action of a driving piece, a top block continuously beats a filtering piece, a rubber block continuously beats the bottom of a sieve plate, and the situation that particulate matter blocks the filtering piece and influences dust absorption is avoided; andthe crushed materials can be conveniently discharged in the vibration process of the sieve plate.Crushing equipment involved in the process is more environment-friendly and is more suitable for preparation of hypromellose phthalate.

Description

Technical field [0001] The present invention relates to the preparation of chemical technology, and particularly relates to a production process of a resist high-purity hydroxypropylmethyl cellulose phthalate. Background technique [0002] Hydroxypropyl methylcellulose phthalate, odorless white particles, is an excellent enteric coating material, or can play a role in the intestinal absorption of the drug best positioned in the small intestine released in the intestines, to avoid irritating drug-induced nausea or upset stomach, so the enteric coating to give full play to the efficacy of the drug to ensure drug stability plays an important role. [0003] In the conventional preparation of hypromellose phthalate process, the need for hypromellose phthalate crushing process, but broken in the process, will generate a lot of dust, pollution production , cause harm to the health of staff. Inventive content [0004] Object of the present invention: the production process in order to s...

AI Technical Summary

Problems solved by technology

[0003] In the traditional process of preparing hypromellose phthalate, it is necessary to crush hypromellose phthalate, and during the crushing process, a large amount of dust will be generated, polluting the production environment , causing harm to the health of the staff

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