Continuous method for making aromatic bis(ether phthalic acid) o

Details Continuous method for making aromatic bis(ether phthalic acid) o Continuous method for making aromatic bis(ether phthalic acid) o

1981-04-16

1982-05-11

Raymond, Richard

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

562473, C07C 6300, C07D30789

Patent

active

043292925

ABSTRACT:
A method is provided for continuously converting aromatic bis(ether N-organo substituted phthalimides) to aromatic bis (ether anhydrides) by heating a biphasic aqueous-organic mixture of aromatic bis(ether N-organo substituted phthalimide), phthalic acid and an exchange catalyst in a heated coiled tube reactor to produce an aqueous phase containing aromatic bis (ether phthalic acid) and an organic phase containing N-organo substituted phthalimide which can then be separated and aromatic bis(ether phthalic anhydride) recovered from the aqueous phase.

REFERENCES:
patent: 3879428 (1975-04-01), Heath et al.
patent: 3957862 (1976-05-01), Heath et al.
patent: 4116980 (1978-09-01), Webb
patent: 4128574 (1978-12-01), Markezich et al.

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