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US-2015376138-A1 · Dec 31, 2015 · US
Isomerization method of cyclohexane dicarboxylic acid
US11897841B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11897841-B2 |
| Application number | US-201915734621-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 21, 2019 |
| Priority date | Jun 15, 2018 |
| Publication date | Feb 13, 2024 |
| Grant date | Feb 13, 2024 |
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Abstract
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Provided is an isomerization method of cyclohexane dicarboxylic acid using zirconia or titania as an isomerization catalyst.
First claim
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The invention claimed is: 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. 2. The isomerization method of cyclohexane dicarboxylic acid of claim 1 , wherein the oxide of the transition metal of Group 4 comprises one or more selected from the group consisting of zirconia and titania. 3. The isomerization method of cyclohexane dicarboxylic acid of claim 1 , wherein the oxide of the transition metal of Group 4 is monoclinic zirconia. 4. The isomerization method of cyclohexane dicarboxylic acid of claim 1 , wherein the oxide of the transition metal of Group 4 is anatase titania. 5. The isomerization method of cyclohexane dicarboxylic acid of claim 1 , wherein the isomerization catalyst is added in an amount such that the weight ratio of the isomerization catalyst to cyclohexane dicarboxylic acid is 0.1 to 2.0. 6. The isomerization method of cyclohexane dicarboxylic acid of claim 1 , wherein the cyclohexane dicarboxylic acid is comprised in an amount of 0.8% by weight to 20% by weight with respect to the total weight of the mixed solution. 7. The isomerization method of cyclohexane dicarboxylic acid of claim 1 , wherein the heat treatment is performed at 220° C. to 280° C.
Assignees
Inventors
Classifications
- C07C51/353Primary
by isomerisation; by change of size of the carbon skeleton · CPC title
- B01J21/063Primary
Titanium; Oxides or hydroxides thereof · CPC title
Zirconium or hafnium; Oxides or hydroxides thereof · CPC title
Geometrical isomers · CPC title
The ring being saturated · CPC title
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- What does patent US11897841B2 cover?
- Provided is an isomerization method of cyclohexane dicarboxylic acid using zirconia or titania as an isomerization catalyst.
- Who is the assignee on this patent?
- Hanwha Solutions Corp
- What technology area does this patent fall under?
- Primary CPC classification C07C51/353. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 13 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).