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Method for preparing cyclohexane carboxylic ester from benzene polycarboxylic ester

A technology of cyclohexane polycarboxylate and benzene polycarboxylate is applied in the field of preparation of cyclohexane polycarboxylate, which can solve the problems of unfavorable industrial production, construction, operation and maintenance costs, and improve contact efficiency. , The effect of reducing construction and maintenance costs, and high productivity

Active Publication Date: 2014-09-10
NANYA PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrogenation reaction tank 10 suitable for operation under high-pressure environment has extremely high construction, operation and maintenance costs, which is not conducive to industrial production

Method used

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  • Method for preparing cyclohexane carboxylic ester from benzene polycarboxylic ester
  • Method for preparing cyclohexane carboxylic ester from benzene polycarboxylic ester
  • Method for preparing cyclohexane carboxylic ester from benzene polycarboxylic ester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Get 500 grams of diisononyl phthalate (DINP), drop into volume and be 1 liter and be provided with in the pressure-resistant reaction tank of pilot gas agitator and make reaction solution, then add the palladium with active carbon as monomer Catalyst 5 grams, keep constant pressure after adding hydrogen to 20 kilograms / square centimeter. Then start the stirring motor of the reaction tank until the stirring shaft is at 500 revolutions per minute, then increase the temperature to 200° C., and then react at 200° C. for 4 hours. After the reaction is completed, close the hydrogen inlet valve, release the hydrogen in the reaction tank, and cool the reaction liquid to room temperature; after filtering out the catalyst, analyze the composition of the reaction product. The results are shown in Table 1. The conversion rate of diisononyl phthalate was 100%, and the yield of diisononyl phthalate was 99.99%.

Embodiment 2

[0055] Same as Example 1, but using diisooctyl phthalate (DIOP) to replace diisononyl phthalate, the reaction temperature is changed to 180° C., and other conditions are the same. The results are shown in Table 1. The conversion rate of diisooctyl phthalate was 99.98%, and the yield of cyclohexane diisooctyl phthalate was 99.5%.

Embodiment 3

[0057] Same as Example 1, but the hydrogen pressure is changed to 40 kg / cm2, the reaction temperature is changed to 180° C., and other conditions are the same. The results are shown in Table 1. The conversion rate of diisononyl phthalate was 100%, and the yield of diisononyl phthalate was 99.995%.

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Abstract

The invention relates to a method for preparing cyclohexane carboxylic ester from benzene polycarboxylic ester, aiming at improving a hydrogenation method of the benzene polycarboxylic ester. In the method, the benzene polycarboxylic ester is hydrogenated to form cyclohexane polycarboxylic ester by utilizing a reaction groove provided with a guidance air stirrer having an air extracting and discharging capability in the presence of a hydrogenation catalyst. The preparation method has the advantages that the operation pressure for hydrogenating the benzene polycarboxylic ester is reduced to the minimum, the hydrogenation reaction temperature is greatly reduced, and the yield obtained by hydrogenating the benzene polycarboxylic ester into the cyclohexane polycarboxylic ester is effectively improved.

Description

technical field [0001] The invention relates to a preparation method of cyclohexane polycarboxylate, in particular to a preparation method of hydrogenating benzene polycarboxylate into cyclohexane polycarboxylate. Background technique [0002] In the plasticizing process of PVC, benzene polycarboxylates (esters of benzenepolycarboxylic acids) are often used as plasticizers to improve the softness and toughness of PVC products. However, benzene polycarboxylates belong to a kind of environmental hormones, such as dibutyl phthalate, diisooctyl phthalate (DIOP) or diisononyl phthalate (DINP), etc. It will cause harm to health, and many countries have restricted its use or banned it, and switched to cyclohexane polycarboxylate, which is harmless to human health, as PVC plasticizer. [0003] And the known preparation method of cyclohexane polycarboxylate has two kinds of esterification reaction method or hydrogenation reaction method. Wherein, the esterification reaction method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/303C07C69/75
Inventor 冯殿润庄荣仁陈仲裕萧衡华
Owner NANYA PLASTICS CORP
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