Anhydride separation process
AssigneeChevron Research Company
InventorDavid M. Marquis
Life of this patent
Estimating the term…
Abstract
An absorption process for separating a maleic or phthalic anhydride from a gaseous mixture containing the anhydride which comprises contacting the gaseous mixture with a liquid absorbent comprising polymethylbenzophenones, at least a portion of which benzophenones contain at least 3 methyl groups, at a temperature for the absorbent between about 20.degree. and 235.degree. C and at a pressure sufficient to effect absorption of the anhydride into the absorbent. Preferably the absorption process is used to remove maleic anhydride from a gas stream, preferably the absorbent includes dixylylketone, and preferably the absorption is carried out by countercurrent contacting in an absorber column.
Claims13
An absorption process for separating maleic or phthalic anhydride from a gaseous mixture containing the anhydride which comprises contacting the gaseous mixture with a liquid absorbent comprising polymethylbenzophenones, at least a portion of which benzophenones contain at least 3methyl groups, at a temperature for the liquid absorbent between about 20.degree. and 235.degree. C and at a pressure sufficient to effect absorption of the anhydride into the absorbent.
An absorption process for separating maleic anhydride from a gaseous mixture containing maleic anhydride which comprises:
- a. feeding a stream of a liquid absorbent comprising a dixylylketone to an absorber column;
- b. feeding a stream of the gas mixture to the absorber column;
- c. countercurrently contacting the liquid absorbent and the gaseous mixture in the absorber column at a temperature between about 20.degree. and 235.degree. to obtain maleic anhydride-rich absorbent and a gas stream lean in maleic anhydride;
- and
- d. recovering an absorbent rich in maleic anhydride and the gas stream lean in maleic anhydride.
Dependencies are inferred from the claim text.