Process for synthesizing bisphenol A by utilizing cation resin

Abstract

The invention discloses a process for synthesizing bisphenol A by utilizing cation resin. The process comprises the steps of delivering after reaction solution reacted by phenol and acetone through a reactor containing cation resin to vacuum for dehydration to remove the acetone, water and parts of the phenol, then delivering a mixture containing the phenol, bisphenol A and impurities to a multi-stage vacuum evaporation system to remove the phenol, later delivering the bisphenol A mixture containing impurities to a falling film crystallizer, separating and obtaining high-purity bisphenol A molten solution through circulation processes of crystallization, part melting and complete melting for several times, delivering separated impurity solution to a static crystallizer, further recovering and obtaining recovery solution of the bisphenol A with high purity, delivering the recovery solution to the falling film crystallizer for recovering, exhausting the impurity solution from the static crystallizer, and further recovering the recovery solution through a vacuum schizolysis process. Products obtained by the invention have high purity and reasonable process.

Description

Technical field: [0001] The invention relates to a production process of bisphenol A. Background technique: [0002] In the bisphenol A synthesis process, how to separate the synthesized bisphenol A from unreacted phenol and generated impurities is a key issue. There is a process that combines phenol, bisphenol A and impurities at an appropriate concentration. , crystallize the suspension after cooling to form crystallized bisphenol A and phenol adduct suspension particles, and carry out solid-liquid separation through a centrifuge, and the obtained bisphenol A and phenol adduct solids are heated and melted, passed through a vacuum The high-purity bisphenol A product is obtained after thin film evaporation and stripping. [0003] Due to the adoption of suspension crystallization and centrifugal separation technology in this process, the bisphenol A and phenol adduct crystals obtained need to be separated by centrifugation to separate the crystals and the mother liquor conta...

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Problems solved by technology

[0003] Due to the adoption of suspension crystallization and centrifugal separation technology in this process, the bisphenol A and phenol adduct crystals obtained need to be separated by centrifugation to separate the crystals and the mother liquor containing impurities. Due to centrifugal separation, it is impossible to completely separate the mother liquor containing impurities. , so after obtaining the adduct crystals, it is also necessary to dissolve the adduct crystals in phenol, and cool the dissolved solution again to obtain a suspension, and send it to centrifugation again to separate the adduct crystals and the mother liquor , this process is long, and requires large-scale high-speed separators to transfer equipment, the failure rate of equipment is high, and the reliability of device operation cannot be fully guaranteed

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