Tetrahalophthalic anhydride process

Details Tetrahalophthalic anhydride process Tetrahalophthalic anhydride process

1992-09-28

1994-02-22

Bernhardt, Emily

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30789

Patent

active

052888797

ABSTRACT:
This invention relates to an improvement in a process for preparing tetrabromophthalic anhydride whereby there is a substantial recovery of reactants such as halogen and SO.sub.3 from a vent stream exiting the reaction vessel. The improvement comprises contacting the vent stream with a fluid having a first oleum concentration and recovering a halogen stream and a second stream, having a second oleum concentration wherein the second oleum concentration is greater than the first oleum concentration.

REFERENCES:
patent: 3382254 (1968-05-01), Jenkner et al.
patent: 4785121 (1988-11-01), Leone-Bay et al.
patent: 5059697 (1991-10-01), Fertel et al.

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