公开(公告)号：US11897841B2

公开(公告)日：2024-02-13

申请号：US15734621

申请日：2019-05-21

Applicant: Hanwha Solutions Corporation

Inventor： Jong Kwon Lee ,  Eun Jeong Kim ,  Sun Uk Lee ,  Nam Jin Jang

IPC: C07C51/353 ,  B01J21/06

CPC classification number: C07C51/353 ,  B01J21/063 ,  B01J21/066 ,  C07B2200/09

Abstract: Provided is an isomerization method of cyclohexane dicarboxylic acid using zirconia or titania as an isomerization catalyst.

公开(公告)号：US11629112B2

公开(公告)日：2023-04-18

申请号：US17293482

申请日：2019-12-16

Applicant: HANWHA SOLUTIONS CORPORATION

Inventor： Namjin Jang ,  Eun Jeong Kim ,  Sun Uk Lee ,  Jong Kwon Lee

IPC: C07C51/36 ,  C07C51/353 ,  C07C29/149 ,  C07C29/158 ,  C07C29/56 ,  B01J21/06 ,  B01J23/44 ,  B01J23/62

Abstract: The present disclosure relates to a method for preparation of 1,4-cyclohexanedimethanol. According to the present disclosure, two step reduction reactions are conducted using terephthalic acid as starting material, and an isomerization process for increasing the rate of trans isomers of CHDA is introduced therebetween, thereby providing a method capable of stably preparing CHDM with high rate of trans isomers.