Process for the recovery of polyarylpolyamines

Details Process for the recovery of polyarylpolyamines Process for the recovery of polyarylpolyamines

1978-06-12

1981-02-10

Hines, Robert V.

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

Organic compounds

Amino nitrogen containing

C07C 8526

Patent

active

042501148

ABSTRACT:
An arylamine such as aniline is condensed with formaldehyde in the presence of aqueous hydrochloric acid to form a mass containing the hydrogen chloride salt of a polyarylpolyamine. The mass is contacted with additional aniline thereby forming an organic phase and an aqueous phase, the 4,4'-polyarylpolyamine overwhelmingly being liberated from its salt form in the aqueous phase and being transferred to the organic phase. High recoveries of the 4,4'-diamino polycondensate are achieved.

REFERENCES:
patent: 3952042 (1976-04-01), Knofel
patent: 3996283 (1976-12-01), Knofel
patent: 4025557 (1977-05-01), Eifler et al.
patent: 4061678 (1977-12-01), Knofel et al.
patent: 4087459 (1978-05-01), Knofel et al.

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