Synthesizing method for trans-1,4-cyclohexanedicarboxylic acid

A technology of cyclohexanedicarboxylic acid and a synthesis method, which is applied in the field of trans-1, can solve the problems of high content of cis-products and difficulties in pure trans-1,4-cyclohexanedicarboxylic acid, and achieve low cost and high raw material Easy to obtain and short synthetic route

Inactive Publication Date: 2009-12-02
JIANGSU KANGHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In a word, in the 1,4-cyclohexanedicarboxylic acid synthesized by these routes, the cis product content is relatively high, and it is difficult to convert into pure trans 1,4-cyclohexanedicarboxylic acid

Method used

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  • Synthesizing method for trans-1,4-cyclohexanedicarboxylic acid
  • Synthesizing method for trans-1,4-cyclohexanedicarboxylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 200g of terephthalic acid into the autoclave, add 15g of catalyst palladium carbon and 30g of protective agent ammonium hydroxide, then add 600g of water, first pass through nitrogen for three times, then pass through hydrogen for three times, and then pass through hydrogen to increase the pressure Stir to 4Mpa and keep it stable, stir and raise the temperature to 100°C, the reaction will accelerate hydrogen absorption, maintain the reaction temperature at 100-120°C, and continue to add hydrogen for 3 hours. After the reaction, the catalyst was filtered while it was hot, the filter cake was used mechanically, and the filtrate was cooled and then filtered to obtain a filter cake with a wet weight of 227 g, dried 191 g, a yield of 95.5%, and a content of trans-1,4-cyclohexanedicarboxylic acid of 98.3%. Apply the filtrate. The catalyst can be applied 13-15 times, and the protective agent can be applied repeatedly.

Embodiment 2

[0025] The amount of the catalyst was changed to 11 g, and the remaining reaction conditions were the same as in Example 1. The final yield was 84.3%, and the content of trans-1,4-cyclohexanedicarboxylic acid was 98.1%.

Embodiment 3

[0027] The amount of the catalyst was changed to 13g, and the rest of the reaction conditions were the same as in Example 1. The final yield was 93.1%, and the content of trans-1,4-cyclohexanedicarboxylic acid was 98.2%.

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Abstract

The invention discloses a synthesizing method for trans-1,4-cyclohexanedicarboxylic acid, which comprises the following steps: adding terephthalic acid, catalysts, protective agents and water into an autoclave; introducing hydrogen gas after introducing nitrogen gas for displacement; continuously adding hydrogen at a temperature of between 100 and 120 DEG C; and after the reaction is finished, sequentially performing overheat filtering, cooling and filtering to obtain the product. The synthesizing method is adopted to prepare the trans-1,4-cyclohexanedicarboxylic acid through one-step reaction by taking the terephthalic acid as an initial raw material, and has the advantages of easily-obtained raw material, short synthesis route, safe and simple process, low cost, over 95 percent of yield and easy realization of industrialized production.

Description

Technical field: [0001] The invention relates to a synthesis method of trans-1,4-cyclohexanedicarboxylic acid. Background technique: [0002] [0003] The trans-1,4-cyclohexanedicarboxylic acid with the molecular formula shown above is an aliphatic dibasic acid with 1,4 substituents and an alicyclic ring structure. It is a polyester resin for high-performance coatings and Glass fiber reinforced plastics have brought many unique properties, and the products are used in automobiles, transportation, industrial maintenance, aerospace, buildings, equipment and instruments, and common metals and gel coat coatings. The relevant information is as follows: [0004] There is no bibliographical report yet on the route of complete synthetic target product, and the route that can obtain close product-mixed formula-1,4-cyclohexanedicarboxylic acid has following several: [0005] The first one is that Zhu Zhiqing et al. (CN200510028867.9) used terephthalic acid to be catalyzed by ruth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C61/09C07C51/36
Inventor 邱志刚
Owner JIANGSU KANGHENG CHEM
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