Claims
- 1. A process for recovering maleic anhydride from gaseous compositions containing maleic anhydride and water, comprising cooling said composition to a temperature in the range of from about 25.degree. C. to about 40.degree. C. at a pressure less than about 50 millimeters of mercury thereby to obtain solid maleic anhydride having less than 300 ppm of maleic acid and fumaric acid impurities.
- 2. A process according to claim 1 wherein the gaseous composition comprises from about 1 to about 30 percent by volume maleic anhydride and from about 10 to about 70 percent by volume water.
- 3. A process according to claim 1 wherein the composition is cooled to a temperature of about 30.degree. C.
- 4. In a process for stripping low-boiling impurities from crude maleic anhydride produced by the vapor phase oxidation of a hydrocarbon feedstock; the improvement which comprises, passing the lights stripper overhead vapor containing, by volume, about 1 to 30 percent maleic anhydride and about 10 to 70 percent water, through a condenser system maintained at a temperature in the range of from about 25.degree. C. to 40.degree. C. at less than about 50 millimeters of mercury pressure thereby to obtain solid maleic anhydride having less than 300 ppm of maleic acid and fumaric acid impurities.
- 5. A process according to claim 4 wherein maleic anhydride recovered in the condenser system is recycled to the lights stripper.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation of U.S. application Ser. No. 809,734, filed June 24, 1977, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
789414 |
Jan 1958 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
809734 |
Jun 1977 |
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