US 11,897,841 B2
Isomerization method of cyclohexane dicarboxylic acid
Jong Kwon Lee, Daejeon (KR); Eun Jeong Kim, Daejeon (KR); Sun Uk Lee, Gunpo-si (KR); and Nam Jin Jang, Daejeon (KR)
Assigned to HANWHA SOLUTIONS CORPORATION, Seoul (KR)
Appl. No. 15/734,621
Filed by Hanwha Solutions Corporation, Seoul (KR)
PCT Filed May 21, 2019, PCT No. PCT/KR2019/006088
§ 371(c)(1), (2) Date Dec. 3, 2020,
PCT Pub. No. WO2019/240393, PCT Pub. Date Dec. 19, 2019.
Claims priority of application No. 10-2018-0069246 (KR), filed on Jun. 15, 2018.
Prior Publication US 2021/0155572 A1, May 27, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 51/353 (2006.01); B01J 21/06 (2006.01)
CPC C07C 51/353 (2013.01) [B01J 21/063 (2013.01); B01J 21/066 (2013.01); C07B 2200/09 (2013.01)] 7 Claims
 
1. An isomerization method of cyclohexane dicarboxylic acid, comprising the step of isomerizing a cis isomer to a trans isomer by heat-treating a mixed solution which is prepared by mixing cyclohexane dicarboxylic acid comprising the cis isomer, water, and an isomerization catalyst,
wherein the mixed solution comprises the cyclohexane dicarboxylic acid in an amount of 0.5% by weight to 30% by weight with respect to the total weight of the mixed solution, and
the isomerization catalyst comprises one or more of oxide of a transition metal of Group 4, and is added in an amount such that a weight ratio of the isomerization catalyst to the cyclohexane dicarboxylic acid (a weight ratio of isomerization catalyst/cyclohexane dicarboxylic acid) of 0.1 or more.