Process for recovering maleic anhydride by condensation
AssigneeChevron Research Company
InventorKiran R. Bakshi
Life of this patent
Estimating the term…
Abstract
A process for recovering maleic anhydride from gaseous compositions comprising maleic anhydride and water by condensing the composition at a temperature in the range of from about 20.degree. C. to about 50.degree. C. and a pressure of less than about 200 millimeters of mercury.
Claims5
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.
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.
Dependencies are inferred from the claim text.