High-precision purification process of crude terephthalic acid

By optimizing the oxidation and purification process, the problem of high 4-CBA content in crude terephthalic acid was solved, achieving high-precision purification, improving the purity of terephthalic acid and the production quality of PET, and reducing energy consumption.

CN122102887APending Publication Date: 2026-05-29江苏嘉通能源有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
江苏嘉通能源有限公司
Filing Date
2026-03-03
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In existing technologies, the mass fraction of 4-CBA in crude terephthalic acid is relatively high, which affects the production quality and stability of PET, resulting in poor vacuum capability, high energy consumption, and may even lead to production accidents.

Method used

By optimizing the oxidation and purification process, including preheating the mixed acetic acid solvent and catalyst, controlling the oxidation reaction conditions, extending the oxidation time, increasing the oxygen flow rate and pressure, using a palladium-on-carbon catalyst for hydrogenation reduction, and gradually cooling for crystallization and drying, the impurity content is reduced.

Benefits of technology

It effectively reduced the 4-CBA content in crude terephthalic acid, improved the purity and yield of terephthalic acid, improved the production quality and stability of PET, and reduced energy consumption.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the technical field of chemical production purification, and discloses a high-precision purification process for crude terephthalic acid, which comprises the following steps: pretreating the material before reaction, increasing a treatment procedure in the reaction, inhibiting the occurrence of branch reactions, promoting the forward conversion of the material, selecting a proper mode to improve the rate of the oxidation reaction, mainly including the purification of para-xylene and acetic acid solvent, the advance mixing of the catalyst and the acetic acid solvent, the improvement and the increase of the process of the oxidation process. Through the process improvement, the content of other impurities in the final terephthalic acid is reduced, the terephthalic acid is converted into 4-CBA, and the terephthalic acid is directly converted into terephthalic acid together with the original mass fraction of 4-CBA, so that the impurity content is reduced, and the yield of the terephthalic acid is improved.
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