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A kind of synthetic method of high 4,4'-isomer content bisphenol f

A synthesis method and isomer technology, applied in the high 4 field, can solve the problem of low bisphenol F content, achieve short reaction time, low reaction temperature, and good industrial application prospects

Inactive Publication Date: 2017-04-26
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the present invention aims to overcome the defect that the content of 4,4'-isomer bisphenol F is not high in the existing phenol and formaldehyde catalyzed synthesis of bisphenol F, and provides a method for obtaining high 4,4'-isomer bisphenol F. Phenol F content and the synthetic method that obtains high bisphenol F yield simultaneously

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1 In a 1000ml three-necked flask under nitrogen protection, add 626 grams of phenol in molten state, keep warm, stir, add 54 grams of Amberlyst-36 cation exchange resin catalyst, make the resin fully swell in phenol for 30 minutes, then slowly add 18 grams of aqueous formaldehyde solution with a mass percentage of 37%, reacted at a constant temperature of 40° C. for 50 minutes, stopped the reaction, filtered the reaction solution, separated the Amberlyst-36 cation exchange resin, re-added the filtrate in the original three-necked flask, raised the temperature to 70° C., and then added 54 gram of Amberlyst-15 cation-exchange resin catalyst, stirred and mixed at constant temperature for 90 minutes, and the reaction was completed, the Amberlyst-15 cation-exchange resin catalyst was separated by filtration, and the filtrate was distilled under reduced pressure to remove water and reclaim phenol, and the concentrate was cooled to obtain bisphenol Product F, the mass y...

Embodiment 2

[0013] Example 2 (comparative example) Same as Example 1, but Amberlyst-36 cation exchange resin catalyst is used in the first and second stage reactions, and the reaction temperature is 40°C, the mass yield of bisphenol F is 39.42%, of which 4 , 4'-, 2,4'- and 2,2'-isomer bisphenol F mass percentages were 72.95%, 19.01% and 8.04%.

Embodiment 3

[0014] Example 3 (comparative example) Same as Example 1, but Amberlyst-15 cation exchange resin catalyst is used in the first and second stage reactions, and the reaction temperature is 90°C, and the mass yield of bisphenol F is 95.10%, wherein 4, The mass percentages of 4'-, 2,4'- and 2,2'-isomers of bisphenol F were 44.08%, 38.76% and 17.16%, respectively.

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Abstract

The invention discloses a synthesis method of high-4,4'-isomer-content bisphenol F, which comprises the following step: by using phenol and formaldehyde as raw materials, synthesizing bisphenol F by a two-step process by using Amberlyst-36 and Amberlyst-15 cation exchange resins as catalysts, wherein the mass percent of the 4,4'-isomer bisphenol F is up to 60% or above, and the mass yield of the bisphenol F is up to 90% or above. The catalysts are commercial cation exchange resins, can be easily purchased, separated and recovered, and are recyclable. The method has the advantages of low reaction temperature, short reaction time and no corrosiveness to equipment, is suitable for continuous production of tubular reactors, and has favorable industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for synthesizing bisphenol F with high 4,4'-isomer content. Background technique [0002] Bisphenol F, according to the different substitution positions of the hydroxyl group on the benzene ring, has three isomers: 4,4'-, 2,4'- and 2,2'-. When bisphenol F is used to prepare low-viscosity epoxy resin, polyester resin, polycarbon resin, etc., the products obtained are better than bisphenol A in heat resistance, moisture resistance, insulation, casting performance, etc. Similar products. The molecular structure and steric hindrance of the three isomers of bisphenol F are different, and their physical and chemical properties are different. Among them, the performance of 4,4'-isomer bisphenol F is better than that of 2,4'-isomer and When 2,2'-isomer bisphenol F and high content of 4,4'-bisphenol F are synthesized into bisphenol F epoxy resin, its viscosity is low, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C39/16C07C37/20
CPCC07C37/20C07C39/16
Inventor 刘跃进唐亮吴志民李勇飞潘浪胜
Owner XIANGTAN UNIV
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