Continuous process for preparing methylene dianilines

Details Continuous process for preparing methylene dianilines Continuous process for preparing methylene dianilines

1973-06-11

1976-05-04

Hines, R. V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453AM, C07C 8508

Patent

active

039548678

ABSTRACT:
A continuous process is described for the preparation of methylene-bridged polyphenyl polyamines containing di(aminophenyl)methane having a high, p,p'-isomer content (at least 98 percent by weight). Fluid streams of aqueous aniline hydrochloride solution and aqueous formaldehyde are intermixed at one end of a continuous tubular reactor, passed therethrough at 0.degree.C to 75.degree.C in about 3 seconds to about 120 seconds, thence to recycle in a cooling zone (less than 60.degree.C), optionally to a holding zone (temperature less than 70.degree.C) and finally to a final reaction zone (temperature 60.degree.C to 120.degree.C) to complete the reaction. The diamine content in the polyamines is controlled by molar ratio of aniline hydrochloride to formaldehyde in the feeds. Preferably the holding zone, where employed, and final reaction zone comprise a continuous tubular vessel.

REFERENCES:
patent: 3260751 (1966-07-01), Powers et al.
patent: 3277139 (1966-10-01), Powers
patent: 3478099 (1969-11-01), Ross et al.
patent: 3496229 (1970-02-01), Powers et al.
patent: 3517062 (1970-06-01), Powers

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