Fractionation process of reaction mixture containing methylene b

Details Fractionation process of reaction mixture containing methylene b Fractionation process of reaction mixture containing methylene b

1991-10-23

1993-01-12

Dees, Josee G.

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

Organic compounds

Isocyanate esters

560347, 560359, C07C26320

Patent

active

051792273

ABSTRACT:
A fractionation process of a methylene bridged polyphenylene polyisocyanate mixture obtained by phosgenating condensation product of aniline and formaldehyde is disclosed.
In order to apply the above mixture to a variety of uses, the process separates the mixture into fractions by giving primary attention to the content of 4,4'-and 2,4'-isomer of diphenylmethane diisocyanate and at the same time reduces the content of impurities having acidity and hydrolyzable chlorine.

REFERENCES:
patent: 4014914 (1977-03-01), Pistor et al.
patent: 4128569 (1978-12-01), Horn et al.
patent: 4847408 (1989-07-01), Frosch et al.

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