Method for preparation of bisphenol A by suspension crystallization and falling film crystallization combined process

A falling film crystallization and suspension crystallization technology, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems of rising device costs, large-scale devices, and difficulty in decomposition, so as to improve product purity and reduce manufacturing costs. cost, the effect of improving system utilization

Active Publication Date: 2015-12-09
NANTONG XINGCHEN SYNTHETIC MATERIAL
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Problems solved by technology

[0004] If you want to obtain high-purity bisphenol A, you usually need to use n>1 n-stage series suspension crystallization to perform repeated recrystallization operations, and you must increase the number of crystal adduct separation devices and crystal adduct dissolution tanks. Just produced the problem of device enlargement, device cost rise; There is also the method that it is purified by distilling from bisphenol A melt, it has been found that in the process of removing phenol, bisphenol A will thermally decompose to form impurities, such as phenol , isopropenylphenol, etc., it is difficult to avoid the decomposition of bisphenol A in the phenol removal step only by controlling the distillation conditions

Method used

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Embodiment Construction

[0020] A method for preparing bisphenol A using a combined process of suspension crystallization and falling film crystallization, comprising the following steps:

[0021] (1) Suspension crystallization

[0022] (1) At a temperature of 65-75° C., adjust the reaction solution into phenol so that the content of p,p-bisphenol A is 25-35% by weight;

[0023] (2) At this temperature, the reaction solution is filled into n-stage series suspension crystallizers with the number of crystallization reactors n>1, and the reaction solution is circulated in each crystallizer with a circulation rate of ≥2000m 3 / Hour;

[0024] (3) In the series of crystallizers, the temperature gradient is arranged from 60°C in the first crystallizer, 50°C in the second crystallization reactor, and 40°C in the final crystallization reactor

[0025] (4) Washing and / or dissolving with phenol to obtain bisphenol A / phenol crystalline adduct; at least a part of the phenol used for washing and / or dissolving is ...

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Abstract

The invention discloses a method for preparation of bisphenol A by a suspension crystallization and falling film crystallization combined process. The method comprises multi-stage suspension crystallization and multistage melting crystallization. The method provided by the invention can prepare bisphenol A with purity above 99.9%, and is more economical compared with suspension crystallization and recrystallization / distillation purification.

Description

technical field [0001] The invention relates to a method for preparing bisphenol A. Background technique [0002] A known method of preparing bisphenol A (2,2-bis(4'-hydroxyphenyl)propane) involves reacting acetone with an excess of phenol in the presence of a strong acid catalyst such as a sulfonic acid-based cation exchange resin. The reaction forms a product mixture which, in addition to unreacted phenol and a small amount of acetone, mainly contains BPA and water. In addition, a small amount of typical by-products of condensation reactions, such as 2-(4-hydroxyphenyl)-2- (2-Hydroxyphenyl)propane (o, p-BPA), substituted indanes, hydroxyphenylindanols, hydroxyphenylchromans, spirobiindanes, substituted indenols, substituted Xanthenes and advanced condensed compounds with three or more benzene rings in the molecular skeleton. [0003] The product is typically cooled to form an approximately equimolar crystalline adduct of bisphenol A / phenol and the BPA and phenol are sepa...

Claims

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Application Information

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IPC IPC(8): C07C37/84C07C39/16
CPCC07C37/685C07C37/84C07C39/16
Inventor 戴伍国陈群庞小琳范洪明
Owner NANTONG XINGCHEN SYNTHETIC MATERIAL
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