Preparation method of high-concentration flaky durene

By combining modified 13X molecular sieve with ultrasonic vibration, the problems of high energy consumption during high-temperature calcination regeneration and uneven crystal thickness were solved, achieving low-energy and high-efficiency preparation of high-concentration flake-shaped mesitylene, thus improving product purity and the effectiveness of subsequent processes.

CN120987723AInactive Publication Date: 2025-11-21WEIFANG HONGRUN NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202511516097.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-23
Publication Date
2025-11-21
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In the existing technology, the high-temperature calcination regeneration of 13X molecular sieve consumes a lot of energy and the adsorption capacity decreases after regeneration. The thickness of the flake-shaped pyromellitic dianhydride produced by the traditional preparation process is uneven, which easily leads to crystal agglomeration and affects the purity of pyromellitic dianhydride.

Method used

High-concentration flake-shaped mesitylene was prepared by using modified 13X molecular sieve, which was modified by mixing with lanthanum nitrate solution to reduce the regeneration temperature of the adsorbent, and by controlling crystal growth with ultrasonic vibration.

Benefits of technology

This method enables the efficient use of low-temperature regenerated adsorbents, improves the purity and yield of flake-shaped mesitylene, reduces energy consumption, and controls crystal thickness, which is beneficial for high-purity and efficient production in subsequent processes.

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Abstract

The invention belongs to the technical field of preparation of organic compounds, and particularly relates to a preparation method of high-concentration flaky durene, which comprises the following specific steps: S1, preparing a modified adsorbent; s2, removing impurities from the raw materials; s3, regenerating the modified adsorbent; s4, dissolving and crystallizing; and S5, separating and drying. According to the method, the modified 13X molecular sieve is adopted, so that the same technical effect of adsorbing and removing polycyclic aromatic hydrocarbon impurities as the existing 13X molecular sieve activated by high-temperature roasting can be realized, and the energy consumption is far lower than that of the existing process for activating the 13X molecular sieve by high-temperature roasting; meanwhile, the crystal purity and yield of the flaky durene prepared on the basis of lower energy consumption can reach the level of an existing process, and the crystal is thinner, so that a subsequent pyromellitic dianhydride preparation process is facilitated.
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