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US 11,629,112 B2Granted
Method for preparation of 1,4-cyclohexanedimethanol
AssigneeNone recorded
InventorsNamjin Jang, Eun Jeong Kim, Sun Uk Lee, Jong Kwon Lee
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AssigneeNone recorded
InventorsNamjin Jang, Eun Jeong Kim, Sun Uk Lee, Jong Kwon Lee
Estimating the term…
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.
A method for preparation of 1,4-cyclohexanedimethanol, comprising steps of:
Dependencies are inferred from the claim text.
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Containing platinum group metals or compounds thereof: containing rhodium or compounds thereof
Of carboxylic acids or derivatives thereof: with hydrogen or hydrogen-containing gases
Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring: by isomerisation
By reactions not involving formation of carboxyl groups: by isomerisation; by change of size of the carbon skeleton
About 13 years 2 months of term left · ends 16 Dec 2039 (estimated)
This application is a National Stage of International Application No. PCT/KR2019/018516 filed Dec. 26, 2019, claiming priority based on Korean Patent Application No. 10-2018-0171228 filed Dec. 27, 2018 with the Korean Intellectual Property Office, the disclosures of which are herein incorporated by reference in their entirety.
This invention relates to a method for preparation of 1,4-cyclohexanedimethanol.
1,4-cyclohexanedimethanol (1,4-cyclohexanedimethanol, CHDM) is widely used as the raw material of medicine, synthetic resin, synthetic fiber or dye, and the like, and particularly, is used as the raw material of environment-friendly polyester polyethylene terephthalate.
FIG. 1 is a graph showing CHDA yield according to time, in the hydrogenation reaction of terephthalic acid.
FIG. 2 is a graph showing trans CHDA rate according to isomerization reaction time.
FIG. 3 is a graph showing changes in CHDM yield, conversion, and selectivity according to time, in the hydrogenation reaction of CHDA.
The terms used herein are only to explain specific embodiments and are not intended to limit the invention. A singular expression includes a plural expression thereof, unless it is expressly stated or obvious from the context that such is not intended. As used herein, the terms “comprise” or “have”, etc. are intended to designate the existence of practiced characteristic, number, step, constructional element or combinations thereof, and they are not intended to preclude the possibility of existence or addition of one or more other characteristics, numbers, steps, constructional elements or combinations thereof.
Although various modifications can be made to the invention and the invention may have various forms, specific examples will be illustrated and explained in detail below. However, it should be understood that these are not intended to limit the invention to specific disclosure, and that the invention includes all the modifications, equivalents or replacements thereof without departing from the spirit and technical scope of the invention.
Hereinafter, a method for preparation of 1,4-cyclohexanedimethanol according to specific embodiments of the invention will be explained in more detail.