Method for making aromatic bis (ether phthalic acid) or aromatic

Details Method for making aromatic bis (ether phthalic acid) or aromatic Method for making aromatic bis (ether phthalic acid) or aromatic

1976-10-04

1978-09-26

Raymond, Richard L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260326R, 260326HL, 562473, 562469, C07D30789

Patent

active

041169808

ABSTRACT:
A method is provided for converting aromatic bis(ether N-organo substituted phthalimide) to aromatic bis(ether anhydride) by heating an aqueous mixture under pressure, of aromatic bis (ether N-organo substituted phthalimide) and phthalic anhydride, or phthalic acid. An exchange is effected between phthalic anhydride or phthalic acid and the aromatic bis(ether N-organo substituted phthalimide) to produce a liquid phase mixture of aromatic bis(ether phthalic acid) and an aqueous vapor phase mixture of N-organo substituted phthalimide. The N-organo substituted phthalimide is selectively removed from the liquid phase mixture by venting the vapor phase therefrom.

REFERENCES:
patent: 3879428 (1975-04-01), Heath et al.
patent: 3933852 (1976-01-01), Cook et al.
patent: 3957862 (1976-05-01), Heath et al.
patent: 4062648 (1977-01-01), Puskas et al.
Groggins, Unit Processes in Organic Synthesis, McGraw-Hill (New York) 1952, pp. 609 to 611, 619 and 620.
Michman et al., J. Chem. Soc. (c), 1971, pp. 3856 to 3859.

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