Process for the disposal of phthalic anhydride decomposer vapors

Details Process for the disposal of phthalic anhydride decomposer vapors Process for the disposal of phthalic anhydride decomposer vapors

1991-05-07

1993-05-25

Tsang, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549247, C07D30789

Patent

active

052141578

ABSTRACT:
A system for producing phthalic anhydride by vapor phase oxidation of orthoxylene, naphthalene or the like which comprises an oxidation section, and a finishing section comprising: a means for decomposing crude phthalic anhydride liquid such that water, various other by-products and small amounts of phthalic anhydride are removed from the crude phthalic anhydride liquid as decomposer vapor; a means for venting decomposer vapor directly to a top portion of a first fractionation column; the first fractionation column being capable of distilling crude phthalic anhydride liquid received from the decomposer means for the purpose of removing light ends therefrom and which is also capable of recovering phthalic anhydride contained within vapors being vented therefrom; and a second fractionation column capable of distilling the crude phthalic anhydride liquid from the first fractionation column and removing tailings therefrom to produce substantially pure phthalic anhydride; whereby phthalic anhydride is recovered from the decomposer vapor and whereby use of a decomposer condenser and associated jet ejectors or vacuum pumps are avoided.

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