Isomerization method of cyclohexane dicarboxylic acid
AssigneeHanwha Solutions Corporation
InventorsJong Kwon Lee, Namjin Jang, Eun Jeong Kim, Sun Uk Lee
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Abstract
The present disclosure relates to an isomerization method of a cyclohexane dicarboxylic acid (CHDA) and, more specifically, to a method for preparing a trans-cyclohexane dicarboxylic acid (t-CHDA) from a cis-cyclohexane dicarboxylic acid (c-CHDA) by means of catalytic isomerization. Particularly, an embodiment of the present disclosure provides a method for preparing, in high efficiency and high yield and at a low cost, a CHDA having a high t-CHDA content from a CHDA mainly containing c-CHDA, by using an isomerization catalyst containing zirconia and having a BET specific surface area of 50 m2/g or more.
Claims11
An isomerization method of a cyclohexane dicarboxylic acid, comprising:
- heat-treating a mixed solution prepared by mixing a cyclohexane dicarboxylic acid containing a cis isomer, water, and an isomerization catalyst to isomerize the cis isomer to a trans isomer,
- wherein the isomerization catalyst contains zirconia and has a BET specific surface of 50 m2/g or more and 140 m2/g or less, and
- wherein:
- the isomerization catalyst has a total amount of acid sites of 400 umol/gcat or more as measured by an ammonia-temperature programmed desorption (NH3-TPD) method.
Dependencies are inferred from the claim text.