Jet pump exhaust recycle in production of phthalic anhydride

Details Jet pump exhaust recycle in production of phthalic anhydride Jet pump exhaust recycle in production of phthalic anhydride

1980-01-30

1981-05-26

Raymond, Richard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603467, C07D30789

Patent

active

042697760

ABSTRACT:
In a process for the production of phthalic anhydride comprising a stage of catalytic oxidation of a mixture of o-xylene or naphthalene and air, a stage of separation of the crude phthalic anhydride from the reaction gas by cooling, and a stage of purification of the crude phthalic anhydride by rectification under vacuum, said vacuum being maintained by at least one jet pump, the improvement which comprises employing compressed air as the operating medium for said jet pump, and recycling resultant compressed air loaded with the exhaust gas to a process gas upstream of the phthalic anhydride separation stage, said process gas being any gas leading to the separation stage, preferably the gas between the oxidation stage and the separation stage.

REFERENCES:
patent: 3528997 (1970-09-01), Juston et al.
patent: 3655521 (1972-04-01), Gehrken et al.

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