GB609533A - Process for making maleic anhydride from maleic acid - Google Patents
Process for making maleic anhydride from maleic acidInfo
- Publication number
- GB609533A GB609533A GB774446A GB774446A GB609533A GB 609533 A GB609533 A GB 609533A GB 774446 A GB774446 A GB 774446A GB 774446 A GB774446 A GB 774446A GB 609533 A GB609533 A GB 609533A
- Authority
- GB
- United Kingdom
- Prior art keywords
- maleic anhydride
- solution
- xylene
- pipe
- water
- 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
Maleic anhydride is made by continuously circulating a solution of maleic anhydride through a heating device and then through a vapour release chamber, the solvent (which may be xylene) being one which is substantially <PICT:0609533/IV(b)/1> inert to maleic anhydride, or maleic acid at working temperatures, is immiscible with water, and has a boiling point, at atmospheric pressure within the range 130-160 DEG C., feeding maleic acid into the circulating solution prior to its entry into said heating device, maintaining said heating device at a temperature such that substantially all of the added maleic acid is converted to maleic anhydride with elimination of water, removing solvent and water vapours from said circulating solution in said vapour release chamber, condensing the removed vapours, removing the water from the condensate, and returning the remaining condensed solvent to the system, withdrawing a portion of the circulating solution subsequent to said vapour release chamber, but prior to the point at which maleic acid is fed to the circulating solution, removing solvent from the withdrawn portion by distillation, condensing and returning the removed solvent to the solution whilst withdrawing the maleic anhydride from which the solvent has been removed. The time in the heating device is preferably less than 15 minutes. Referring to the Figure, a solution of maleic anhydride in xylene is drawn from tank 1 by pump 4 and passed through heater 8 and vapour release chamber 10, which may be held at atmospheric or raised or reduced pressure. Vapours of water and xylene pass by pipe 11 to condenser 12 and separator 13, the residual solution of maleic anhydride in xylene returning by pipe 16 to tank 1. Xylene separated from the water in separator 13 returns to tank 1 by pipe 15. Maleic acid is fed to the circulating solution by inlet 23 to pipe 5, and solution is withdrawn by pipe 17 to still 18, where xylene is distilled from the maleic anhydride and returns by pipe 19 and condenser 20 to tank 1. U.S.A. Specification 2,222,283 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB774446A GB609533A (en) | 1946-03-12 | 1946-03-12 | Process for making maleic anhydride from maleic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB774446A GB609533A (en) | 1946-03-12 | 1946-03-12 | Process for making maleic anhydride from maleic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB609533A true GB609533A (en) | 1948-10-01 |
Family
ID=9838886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB774446A Expired GB609533A (en) | 1946-03-12 | 1946-03-12 | Process for making maleic anhydride from maleic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB609533A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1129473B (en) * | 1955-05-09 | 1962-05-17 | California Spray Chemical Corp | Process for the production of maleic anhydride from aqueous maleic acid solutions containing alkali metal cations and other by-products |
| DE1176126B (en) * | 1961-08-23 | 1964-08-20 | Basf Ag | Process for the production of maleic anhydride by heating maleic acid |
-
1946
- 1946-03-12 GB GB774446A patent/GB609533A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1129473B (en) * | 1955-05-09 | 1962-05-17 | California Spray Chemical Corp | Process for the production of maleic anhydride from aqueous maleic acid solutions containing alkali metal cations and other by-products |
| DE1176126B (en) * | 1961-08-23 | 1964-08-20 | Basf Ag | Process for the production of maleic anhydride by heating maleic acid |
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