A separation and purification device for pyromellitic dianhydride

By using a combination of a separation chamber and a cooling chamber, and by employing temperature gradient crystallization and ethanol rinsing, the problem of incomplete purification of pyromellitic dianhydride in existing technologies has been solved, thus achieving the production of high-purity pyromellitic dianhydride.

CN224345447UActive Publication Date: 2026-06-12PUYANG LONG DE YOUNG NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
PUYANG LONG DE YOUNG NEW MATERIAL CO LTD
Filing Date
2025-07-11
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

The existing purification methods for pyromellitic dianhydride are not thorough enough, resulting in low purity.

⚗Method used

A combination of a separation chamber and a cooling chamber is used, employing temperature gradient crystallization and ethanol rinsing methods. Solid-liquid separation is achieved through filtration and spraying, thereby improving purity.

🎯Benefits of technology

It significantly improved the purity of pyromellitic dianhydride, achieving a more thorough purification effect.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a kind of separation and purification devices for pyromellitic dianhydride, including separation tank, the inside installation of separation tank can filter the filter screen of the crystal after cooling and the spray head of the ethanol flushing of the crystal reduces mother liquor residue, the top of separation tank is installed cooling tank with three different constant temperature cavities inside, the cavity between cooling tank can realize intercommunication, the utility model is by pouring PMDA crude product solution into the inside of cooling tank, from high to low cooling crystallization in different cavities, temperature difference gradient makes crystal directional growth according to oswald ripening mechanism, improves crystallinity, after crystallization The solution enters the inside of separation tank, mother liquor and crystal are filtered by filter screen, and 60 ℃ ethanol is sprayed on the accumulated crystal by spray head, further reduce mother liquor residue, realize solid-liquid dynamic separation, to effectively improve the purity of PMDA.
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