Process for isolating 4,4'-diaminodiphenylmethane

Details Process for isolating 4,4'-diaminodiphenylmethane Process for isolating 4,4'-diaminodiphenylmethane

1975-08-18

1977-02-15

Hines, Robert V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2605708R, 260575, 260578, C07C 8526

Patent

active

040082750

ABSTRACT:
2,2'- AND 2,4'-DIAMINODIPHENYLMETHANE ARE SELECTIVELY REMOVED FROM ADMIXTURES THEREOF WITH THE 4,4'-ISOMER BY HEATING THE ISOMER MIXTURE AT 30.degree. TO 100.degree. C in the presence of styrene, .alpha.-alkylstyrenes, or the mono- or diamino nuclear substituted derivatives thereof and a catalyst (mineral acid, clays, diatomaceous earth, zeolites). The styrene or .alpha.-alkylstyrene can be employed as such or generated in situ from a precursor therefor. The process is particularly useful in facilitating the isolation of substantially pure 4,4'-diaminodiphenylmethane from the polyamine mixture obtained by condensation of aniline and formaldehyde.

REFERENCES:
patent: 2943112 (1960-06-01), Popoff et al.
patent: 3245924 (1966-04-01), Cox et al.
patent: 3359317 (1967-12-01), Krimm et al.
patent: 3362979 (1968-01-01), Bentleg
patent: 3365347 (1968-01-01), Lund et al.
patent: 3424795 (1969-01-01), Lund et al.
patent: 3676497 (1972-07-01), Recchio et al.
patent: 3857890 (1974-12-01), Recchio et al.

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