GB1419909A - Preparation of citraconic acid - Google Patents
Preparation of citraconic acidInfo
- Publication number
- GB1419909A GB1419909A GB1553774A GB1553774A GB1419909A GB 1419909 A GB1419909 A GB 1419909A GB 1553774 A GB1553774 A GB 1553774A GB 1553774 A GB1553774 A GB 1553774A GB 1419909 A GB1419909 A GB 1419909A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- anhydride
- citraconic
- citraconic acid
- catalyst
- 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
- C07C57/00—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms
- C07C57/02—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms with only carbon-to-carbon double bonds as unsaturation
- C07C57/13—Dicarboxylic acids
- C07C57/155—Citraconic acid
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
Abstract
1419909 Citraconic acid and anhydride PFIZER Inc 8 April 1974 [12 Sept 1973] 15537/74 Heading C2C Citraconic acid or anhydride is obtained by heating citromalic acid, mesaconic acid, paraconic acid, 3-methylmalic acid or a mixture thereof at 160-330‹ C., removing the resultant vapour and recovering citraconic acid or anhydride from this vapour. Inert gaseous or liquid diluents may be present. In one method exemplified, a solution of the reactant in an inert solvent (water or ketone) is passed as a spray mist in an inert gas into a reaction zone containing solid particulate material (e.g. alumina); a catalyst (alkali metal, alkaline earth metal or magnesium salt of phosphoric acid, pyrophosphoric acid, boric acid or sulphuric acid or the corresponding free acid) may be supported on the solid; the required product may be recovered by condensing in cold traps, absorption in a scrubber using for example water, or by fractional distillation procedures. Another method of carrying out the process is to place reactant in a distillation vessel, heat (preferably at 15-100 torr) and distil and collect the required product; a catalyst (as above) may be present in the vessel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US39687273A | 1973-09-12 | 1973-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1419909A true GB1419909A (en) | 1975-12-31 |
Family
ID=23568954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1553774A Expired GB1419909A (en) | 1973-09-12 | 1974-04-08 | Preparation of citraconic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1419909A (en) |
-
1974
- 1974-04-08 GB GB1553774A patent/GB1419909A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |