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Method of preparing anhydrosugar alcohol by two-step reaction
US10759811B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10759811-B2 |
| Application number | US-201615246954-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 25, 2016 |
| Priority date | Aug 26, 2015 |
| Publication date | Sep 1, 2020 |
| Grant date | Sep 1, 2020 |
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Abstract
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The present invention provides a method for preparing anhydrosugar alcohol, in which the reaction temperature in a vacuum reaction that converts sugar alcohol into anhydrosugar alcohol is controlled to two steps of temperature that is, a first-step low reaction temperature of 100 to 150° C. and a second-step high reaction temperature of 151 to 240° C., so that the selectivity for the intermediate product 1,4-sorbitan can be increased, thereby increasing the yield of anhydrosugar alcohol.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of preparing anhydrosugar alcohol comprising: subjecting to a first-step dehydration reaction of an aqueous solution of sugar alcohol at a temperature of 100 to 150° C. in the presence of a catalyst and then subjecting to a second-step dehydration reaction at a temperature of 151 to 240° C., wherein the first-step dehydration reaction and the second-step dehydration reaction are performed at a pressure of greater than 5 mmHg to less than or equal to 200 mmHg. 2. The method of claim 1 , wherein the catalyst is a homogeneous catalyst. 3. The method of claim 1 , wherein the first-step reaction and the second-step reaction are performed for 10-300 minutes and 10-180 minutes, respectively. 4. The method of claim 1 , wherein the anhydrosugar alcohol is isosorbide, and the sugar alcohol is sorbitol. 5. The method of claim 1 , which is performed in a continuous stirred tank reactor (CSTR), a plug flow reactor (PFR), a trickle bed reactor (TBR) or a batch reactor (BR). 6. The method of claim 1 , wherein the second-step reaction product is collected by being condensed to liquid in a condenser maintained at a temperature of -40 to 100° C.
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- C07D493/04Primary
Ortho-condensed systems · CPC title
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- What does patent US10759811B2 cover?
- The present invention provides a method for preparing anhydrosugar alcohol, in which the reaction temperature in a vacuum reaction that converts sugar alcohol into anhydrosugar alcohol is controlled to two steps of temperature that is, a first-step low reaction temperature of 100 to 150° C. and a second-step high reaction temperature of 151 to 240° C., so that the selectivity for the intermedia…
- Who is the assignee on this patent?
- Sk Innovation Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C07D493/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 01 2020 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).