A method for purifying crude α,α,α'-tris(4-hydroxyphenyl)-1-ethyl-4-isopropylbenzene

By using a purification method combining poor solvents and benign solvents, combined with the use of glacial acetic acid, the problem of insufficient TPPA purity in the prior art was solved, and the effect of efficiently improving TPPA purity was achieved.

CN119751220APending Publication Date: 2025-04-04DAJING ELECTRONIC CHEM (XUZHOU) CO LTD
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Patent Information

Application Number
CN202411909427.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

The purity of α,α,α’-tris(4-hydroxyphenyl)-1-ethyl-4-isopropylbenzene (TPPA) produced in the prior art is generally around 98.5-91.5%, and cannot meet the high purity requirements required for the synthesis of photoresist formulation additives and photosensitive substances PAC.

Method used

A purification method is adopted, which includes using a poor solvent that does not dissolve TPPA to remove impurities, and then using a benign solvent that dissolves TPPA to remove residual impurities by cooling and crystallization method, and adding glacial acetic acid at less than or equal to 60°C to keep the solution clean and cool and crystallization slowly.

Benefits of technology

It effectively improves the purity of the crude product of α,α,α’-tris(4-hydroxyphenyl)-1-ethyl-4-isopropyl benzene, reaching more than 99.9%, and is simple to operate, recyclable solvent, high yield and high efficiency.

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Abstract

An embodiment of the present application provides a method for purifying a crude α,α,α'-tri(4-hydroxyphenyl)-1-ethyl-4-isopropylbenzene, the method comprising: using a poor solvent that does not dissolve α,α,α'-tri(4-hydroxyphenyl)-1-ethyl-4-isopropylbenzene to remove impurities dissolved in the poor solvent in the crude α,α,α'-tri(4-hydroxyphenyl)-1-ethyl-4-isopropylbenzene; using a good solvent that dissolves α,α,α'-tri(4-hydroxyphenyl)-1-ethyl-4-isopropylbenzene, and removing impurities dissolved in the good solvent in the crude α,α,α'-tri(4-hydroxyphenyl)-1-ethyl-4-isopropylbenzene by a cooling and crystallization method; wherein, after dissolving the crude α,α,α'-tri(4-hydroxyphenyl)-1-ethyl-4-isopropylbenzene in the good solvent, cooling to 45-55°C, adding glacial acetic acid and stirring, and then cooling and crystallizing. The purification method of the embodiment of the present application can at least improve the purity of the crude product of α,α,α'-tri(4-hydroxyphenyl)-1-ethyl-4-isopropylbenzene.
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Citation Information

Patent Citations

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