GB612790A - Improvements in the manufacture of crotonic anhydride - Google Patents
Improvements in the manufacture of crotonic anhydrideInfo
- Publication number
- GB612790A GB612790A GB1695846A GB1695846A GB612790A GB 612790 A GB612790 A GB 612790A GB 1695846 A GB1695846 A GB 1695846A GB 1695846 A GB1695846 A GB 1695846A GB 612790 A GB612790 A GB 612790A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crotonic
- anhydride
- acetic acid
- acetic
- hydroquinone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/56—Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Crotonic acid is dehydrated to crotonic anhydride by heating it with acetic anhydride to a temperature below 100 DEG C. under conditions such that the acetic acid formed is continuously removed as reaction proceeds. The reactants may be heated under a pressure such that the acetic acid boils below 100 DEG C., or the acetic acid may be removed as an azeotropic mixture with, e.g. heptane or methyl-cyclohexane. A polymerisation inhibitor such as hydroquinone may be present. Examples describe the reaction in presence of hydroquinone of acetic anhydride and crotonic acid (1) at 100 mm. pressure, (2) in presence of heptane. The Provisional Specification refers to the preparation of acrylic and methacrylic anhydrides by the above method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1695846A GB612790A (en) | 1946-06-04 | 1946-06-04 | Improvements in the manufacture of crotonic anhydride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1695846A GB612790A (en) | 1946-06-04 | 1946-06-04 | Improvements in the manufacture of crotonic anhydride |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB612790A true GB612790A (en) | 1948-11-17 |
Family
ID=10086720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1695846A Expired GB612790A (en) | 1946-06-04 | 1946-06-04 | Improvements in the manufacture of crotonic anhydride |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB612790A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1231201A1 (en) * | 2001-02-09 | 2002-08-14 | Röhm GmbH & Co. KG | Process for the preparation of anhydrides of unsaturated carboxylic acids |
-
1946
- 1946-06-04 GB GB1695846A patent/GB612790A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1231201A1 (en) * | 2001-02-09 | 2002-08-14 | Röhm GmbH & Co. KG | Process for the preparation of anhydrides of unsaturated carboxylic acids |
| US6936734B2 (en) | 2001-02-09 | 2005-08-30 | Roehm Gmbh & Co., Kg | Process for manufacturing unsaturated carboxylic acid anhydrides |
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