Phthalic anhydride reaction system

Details Phthalic anhydride reaction system Phthalic anhydride reaction system

1980-04-28

1981-04-14

Raymond, Richard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30789

Patent

active

042618991

ABSTRACT:
In a process for preparing phthalic anhydride, o-xylene is oxidized with air in a dilute phase transported bed reactor. The reaction is initiated with an o-xylene concentration above the upper flammability limit. Air is injected to a plurality of points along the reactor so as to prevent the oxygen concentration in the reactor from falling too low to maintain catalyst activity, while, at the same time, staying outside of the flammability envelope of the organic-oxygen mixtures. The process permits use of overall o-xylene/oxygen ratios which are substantially higher than were heretofore possible because of safety considerations, thereby minimizing the quantity of inert gases in the system, which reduces the size the complexity of the product recovery system.

REFERENCES:
patent: 3565919 (1971-02-01), Friedrichsen et al.
patent: 3600440 (1971-08-01), Foster et al.

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