1,4-cyclohexanedimethanol composition and method for purifying the same
AssigneeHanwha Solutions Corporation
InventorsEun Jeong KIM, Sun Uk LEE, Namjin JANG
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Abstract
The present disclosure relates to a 1,4-cyclohexanedimethanol (CHDM) composition and a purification method of the same. More specifically, it relates to a 1,4-cyclohexanedimethanol composition having a high purity due to a low by-product content and a high trans isomer ratio, and a method for purifying the same.
Claims14
A 1,4-cyclohexanedimethanol composition comprising 1,4-cyclohexanedimethanol (CHDM) having a purity of 99.5 wt % or more as measured by gas chromatography (GC) and containing cis isomers and trans isomers;
- and
- 0.15 wt % or less of a light by-product having a molecular weight of less than 144.21 g/mol.
A method for purifying a 1,4-cyclohexanedimethanol composition, comprising the steps of:
- a water removal step of removing water from a 1,4-cyclohexanedimethanol (CHDM) crude composition;
- a first by-product removal step of removing a by-product having a lower boiling point than 1,4-cyclohexanedimethanol from the 1,4-cyclohexanedimethanol composition that has undergone the water removal step;
- and
- a second by-product removal step of recovering a purified 1,4-cyclohexanedimethanol composition by removing a by-product having a higher boiling point than 1,4-cyclohexanedimethanol from the 1,4-cyclohexanedimethanol composition that has undergone the first by-product removal step.
Dependencies are inferred from the claim text.