Esterification unit for producing crude methyl methacrylate, esterification process using said unit and plant comprising said unit
US-10131614-B2 · Nov 20, 2018 · US
Method for producing alpha-hydroxy carboxylic esters in the gas phase
US9809530B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9809530-B2 |
| Application number | US-201515323888-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 23, 2015 |
| Priority date | Aug 1, 2014 |
| Publication date | Nov 7, 2017 |
| Grant date | Nov 7, 2017 |
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- Title
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Abstract
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The present invention relates to a process for preparing alpha-hydroxycarboxylic esters from the alcoholysis of alpha-hydroxycarboxamides in the gas phase, characterized in that the conversion is effected in the presence of water.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for preparing alpha-hydroxycarboxylic esters, the process comprising: performing an alcoholysis reaction of an alpha-hydroxycarboxamide and an alcohol in a gas phase in the presence of a heterogeneous catalyst, wherein a molar ratio of the alcohol to the alpha-hydroxycarboxamide is 2-25 mol/mol, and wherein the alcoholysis reaction is performed in the presence of 0.01-10 mol/mol of water relative to the alpha-hydroxycarboxamide. 2. The process according to claim 1 , wherein the catalyst is a zirconium dioxide catalyst. 3. The process according to claim 1 , wherein the alcoholysis reaction is performed at a reaction temperature of 150-300° C. 4. The process according to claim 1 , further comprising treating the alpha-hydroxycarboxamide, the alcohol, or both with a cationic ion exchanger prior to the performing of the alcoholysis reaction in the gas phase. 5. The process according to claim 1 , wherein the alpha-hydroxycarboxamide is hydroxyisobutyramide and the alcohol is methanol. 6. The process according to claim 1 , wherein ammonia is formed and the process further comprises feeding the ammonia into a hydrogen cyanide preparation process or an ammoxidation process.
Assignees
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Classifications
of saturated hydroxy-carboxylic acids · CPC title
Preparation, {separation or purification} of hydrogen cyanide {(C01C3/001 takes precedence)} · CPC title
- C07C67/20Primary
from amides or lactams · CPC title
Preparation of ammonia from nitrogenous organic substances · CPC title
Zirconium or hafnium; Oxides or hydroxides thereof · CPC title
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Frequently asked questions
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- What does patent US9809530B2 cover?
- The present invention relates to a process for preparing alpha-hydroxycarboxylic esters from the alcoholysis of alpha-hydroxycarboxamides in the gas phase, characterized in that the conversion is effected in the presence of water.
- Who is the assignee on this patent?
- Krill Steffen, Ait Aissa Belaid, May Alexander, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification C07C67/20. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 07 2017 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).