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Method for reducing isopropyl phenol in bisphenol A preparation reaction system

A technology of isopropyl phenol and reaction system, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of reducing the life of the catalyst, the inability of isopropyl phenol to make better treatment, and affecting the activity of the catalyst. and other problems, to achieve the effect of low consumption of raw materials, fewer devices and less solid waste

Pending Publication Date: 2022-03-25
凯美科(无锡)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the amount of tar produced can be reduced and the consumption of raw materials can be reduced, but most of the isopropyl phenol will still enter the reaction system, which will affect the activity of the catalyst and reduce the life of the catalyst
[0005] Obviously, the methods for producing bisphenol A in the prior art cannot handle isopropyl phenol better

Method used

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  • Method for reducing isopropyl phenol in bisphenol A preparation reaction system
  • Method for reducing isopropyl phenol in bisphenol A preparation reaction system

Examples

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Effect test

Embodiment 1

[0040] refer to figure 1 and figure 2 , the present embodiment provides a method for reducing isopropylphenol in the reaction system for preparing bisphenol A, and the specific steps include:

[0041] (1) Catalyzed reaction: Under the action of a strongly acidic cation exchange resin catalyst, excessive phenol and acetone are condensed in a condensation reactor to generate bisphenol A, and bisphenol A, unreacted raw materials and a small amount of impurities are obtained; Heat excess recovered phenol or fresh phenol (phenol raw material to be added to the condensation reactor) to a suitable temperature and mix it with acetone in proportion, and at least a part of the mother liquor I crystallized and separated in the subsequent step (2), and subsequent isomerization The mixture returned in step (4) enters the condensation reactor, which is filled with a strong acidic cationic transfer resin catalyst, and the condensation reaction of phenol and acetone is completed therein. Th...

Embodiment 2

[0071] The preparation method of bisphenol A comprises the following steps:

[0072] Step (1): Under the action of a strong acidic cation exchange resin catalyst, 7.9kg / h of acetone and 25.15kg / h of supplemented phenol raw material, and the mother liquor I separated from the subsequent crystallization step 64.78kg / h, and the subsequent isomerization step The returned mixture of phenol and bisphenol A is mixed at 38kg / h and then enters the reactor for condensation reaction to generate bisphenol A to obtain 135.83kg / h of reversed mixed liquid of bisphenol A, unreacted raw materials and a small amount of impurities.

[0073] Step (2): The back liquid obtained in step (1) is rectified and concentrated in the light removal tower, and 16.35 kg / h of low boiling point components such as acetone, water and phenol removed are recovered in the dehydration tower of the raw material recovery system, and the tower bottom The concentrate I was obtained at 119.48kg / h. Crystallize the concent...

Embodiment 3

[0083] This example adopts the method for preparing bisphenol A in Example 1, and this example is the data when the catalyst in the condensation reactor has been used for 13 months.

[0084] Under the action of strong acidic cation exchange resin catalyst, 79kg / h acetone and 252kg / h supplemented phenol, and the mother liquor I 648kg / h separated in the subsequent crystallization step, and the mixture of phenol and bisphenol A returned in the subsequent isomerization step 380kg / h h enters the condensation reactor after mixing, and the material composition (mass percentage) of the reactor inlet is: phenol content is 78.61%, bisphenol A content is 9.60%, acetone content is 4.49%, 2,4 bisphenol A content is 2.37% , isopropyl phenol is 0.18%, and other impurities and heavy components are 4.75%. The above mixture enters the condensation reactor, undergoes condensation reaction under the action of a catalyst to generate bisphenol A, and obtains 1359 kg / h of back liquid of bisphenol A,...

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Abstract

The invention discloses a method for reducing isopropyl phenol in a bisphenol A preparation reaction system, which comprises the following steps of: performing condensation reaction on excessive phenol and acetone in a condensation reactor through a catalyst, performing isomerization-cracking-rearrangement on at least one part of post-reaction liquid to obtain rearrangement liquid, and performing concentration process treatment on the rearrangement liquid containing isopropyl phenol, the isopropyl phenol enters a phenol recovery system and is separated from the phenol along with the mixed polyphenol; the mass percent content of isopropyl phenol in the condensation reactor is less than or equal to 0.25%. According to the present invention, the isopropyl phenol-containing cracking rearrangement product is subjected to the concentration process, such that the isopropyl phenol enters the light component and is discharged along with the mixed polyphenol, and the isopropyl phenol content in the phenol extracted from the tower top can be adjusted by adjusting the tower kettle extraction amount and other means; the problem that the service life of a catalyst is shortened due to the fact that lysate or redrainage liquid for generating isopropyl phenol directly enters a reaction system in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of production of bisphenol A, in particular to a method for reducing isopropyl phenol in a reaction system for preparing bisphenol A. Background technique [0002] Bisphenol A (BPA), one of the most widely used industrial compounds in the world, is mainly used to synthesize materials such as polycarbonate (PC) and epoxy resin. [0003] Usually, bisphenol A is an important organic chemical raw material formed by condensation of two molecules of phenol and one molecule of acetone in the presence of an acidic catalyst. The catalyst commonly used in the prior art is sulfonic acid loaded with amino mercaptan Type strong acid ion exchange resin, the process steps mainly include reaction - raw material recovery - crystallization purification - adduct decomposition - concentration - granulation. However, the above process will accumulate impurity isopropyl phenol in the system. Chinese invention patent CN101370761A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/52C07C37/74C07C39/06C07C39/04C07C37/20C07C37/84C07C39/15
CPCC07C37/52C07C37/74C07C37/20C07C37/84C07C39/15C07C39/06C07C39/04
Inventor 陈群周继东何明阳钱俊峰
Owner 凯美科(无锡)技术有限公司
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