Isomerization method of cyclohexanedicarboxylic acid

A cyclohexanedicarboxylic acid, isomerization technology, applied in the field of isomerization of cyclohexanedicarboxylic acid, can solve the unproven reaction efficiency, yield and processing performance, t-CHDA is hard, difficult to handle and other problems

Pending Publication Date: 2022-07-15
HANWHA SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, since the method is heated to temperatures above the melting point of the t-isomer, the obtained t-CHDA is very hard and difficult to handle
Furthermore, there is a problem that only heat treatment of t-CHDA followed by recrystallization from water using activated carbon can finally obtain t-CHDA with a high purity of 98%
[0009] In addition to this, several methods for the preparation of CHDA containing high concentrations of t-CHDA have been proposed, but a single method that is superior in terms of reaction efficiency, yield, and processability has not yet been demonstrated.

Method used

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  • Isomerization method of cyclohexanedicarboxylic acid
  • Isomerization method of cyclohexanedicarboxylic acid
  • Isomerization method of cyclohexanedicarboxylic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0086] For the isomerization of CHDA, a batch reactor capable of withstanding 300°C and 150 bar was selected as the reactor. 4.05 g of CHDA containing the cis isomer, 1.125 g of zirconia (monoclinic) from Saint-Gobain and 250 g of distilled water as solvent were placed in the prepared batch reactor and stirred at 50 rpm At the same time, the temperature of the mixed solution was raised to 250° C. (CHDA concentration in the solution: 1.6 wt %, zirconia / CHDA weight ratio=0.28). When the temperature of the mixed solution reached 250°C, the stirring speed was increased to 1000 rpm, and the reaction was performed for 5 hours while stirring.

[0087] The BET specific surface area, pore volume and average pore diameter of the zirconia (monoclinic) used here are shown in Table 1 below, and the acid properties are shown in Table 2 below.

Embodiment 2

[0089] The procedure was carried out in the same manner as in Example 1, except that zirconia (monoclinic) from Johnson Matthey was used instead of zirconia (monoclinic) from Saint-Gobain used in Example 1.

Embodiment 3

[0091] Except for using zirconia (monoclinic)-titanium dioxide (anatase) from Saint-Gobain (where the content of titanium dioxide (anatase) in the total mixture (100% by weight) was 41% by weight) instead of the one used in Example 1 The procedure was carried out in the same manner as in Example 1 except for zirconia (monoclinic) from Saint-Gobain.

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Abstract

The present disclosure relates to a process for the isomerization of cyclohexanedicarboxylic acid (CHDA), and more particularly, to a process for the preparation of trans-cyclohexanedicarboxylic acid (t-CHDA) from cis-cyclohexanedicarboxylic acid (c-CHDA) by catalytic isomerization. In particular, one embodiment of the present invention provides a method for producing CHDA having a high t-CHDA content from CHDA mainly containing c-CHDA at high efficiency, high yield and low cost by using an isomerization catalyst containing zirconium oxide and having a BET specific surface area of 50 m2 / g or more.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of Korean Patent Application No. 10-2019-0160692, filed with the Korean Intellectual Property Office on December 5, 2019, the contents of which are incorporated herein by reference in their entirety. technical field [0003] The present disclosure relates to a process for the isomerization of cyclohexanedicarboxylic acid (CHDA), and more particularly, to the preparation of trans-cyclohexanedicarboxylic acid (c-CHDA) from cis-cyclohexanedicarboxylic acid (c-CHDA) by catalytic isomerization t-CHDA). Background technique [0004] Cyclohexanedicarboxylic acid (CHDA) is widely used as a raw material for pharmaceuticals, synthetic resins, synthetic fibers or dyes, especially trans-cyclohexanedicarboxylic acid (t-CHDA) Resin or fiber raw material for strength properties. Therefore, CHDA containing high concentrations of t-CHDA is required. [0005] Typically, CHDA is prepared by hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/353C07C51/50C07C61/09B01J35/10B01J21/06A61K31/194
CPCC07C51/353B01J21/066B01J23/10B01J35/1019B01J35/1014B01J35/1061B01J35/1066B01J35/002C07C61/09C07C51/50B01J21/063B01J35/1038A61K31/194
Inventor 李鐘权张南镇金恩廷李仙旭
Owner HANWHA SOLUTIONS CORP
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