Adsorbent for adsorptive separation of bisphenol a and 2,4-bisphenol a and adsorptive separation process thereof

By preparing a rare earth-containing high-silica Y molecular sieve adsorbent, the problem of low separation efficiency of bisphenol A and 2,4-bisphenol A in the crystallization mother liquor during bisphenol A production was solved, achieving a highly selective and low-energy-consumption adsorption and separation effect, thus improving production efficiency and economy.

CN121103309BActive Publication Date: 2026-06-23TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN UNIV
Filing Date
2025-09-16
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In the production of bisphenol A, the existing technology has low separation efficiency of bisphenol A, 2,4-bisphenol A, 3-phenol and chromium in the crystallization mother liquor, resulting in product waste and increased energy consumption. Moreover, the existing adsorption separation technology has poor selectivity and regenerability, and the process conditions are harsh.

Method used

High-silica Y molecular sieve containing rare earth elements was used as the adsorbent. A highly selective and recyclable adsorbent was prepared by desilication-dealumination treatment and rare earth ion exchange technology. Adsorption and separation were carried out in a fixed-bed reactor at low temperature and atmospheric to medium pressure. Phenol was used as the eluent to regenerate the adsorbent.

Benefits of technology

It achieves efficient separation of bisphenol A and 2,4-bisphenol A, reduces material and energy consumption, improves production efficiency, and the adsorbent is highly reusable, meeting the requirements of green chemical industry.

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Abstract

The present application relates to adsorption separation of bisphenol A and 2,4-bisphenol A adsorbent and its adsorption separation process; the adsorbent is a high-silicon Y molecular sieve containing rare earth, the molar ratio of the contained silicon oxide and aluminum oxide is 2.5:1-15:1, the contained rare earth metal is one or a combination of multiple of lanthanum, cerium, scandium and yttrium, the content of rare earth metal is 10:1-1000:1 in terms of the molar ratio of silicon and rare earth metal, and the rare earth metal exists in the form of metal ions. The adsorption separation process is to contact the mixture containing bisphenol A, 2,4-bisphenol A, triphenol and chroman in the crystallization mother liquor with the adsorbent in the adsorption separation reactor to carry out adsorption separation, and the obtained bisphenol A and 2,4-bisphenol A after adsorption separation enter the isomerization reaction unit; the obtained triphenol and chroman after adsorption separation enter the cracking reaction unit. Phenol is used as the eluent, has strong affinity with the adsorbent, and the elution efficiency reaches more than 95%.
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