Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Isomerization method of cyclohexanedicarboxylic acid
  • Isomerization method of cyclohexanedicarboxylic acid
  • Isomerization method of cyclohexanedicarboxylic acid

Examples

Experimental program
Comparison scheme
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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/353C07C51/50C07C61/09B01J35/10B01J21/06A61K31/194
CPCC07C51/353B01J21/066B01J23/10B01J35/30B01J35/613B01J35/651B01J35/647B01J35/615C07C61/09C07C51/50B01J21/063A61K31/194B01J35/633
Inventor 李鐘权张南镇金恩廷李仙旭
Owner HANWHA SOLUTIONS CORP
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com