Process for the manufacture of 4,4'-diphenyl-methane diisocyanat

Details Process for the manufacture of 4,4'-diphenyl-methane diisocyanat Process for the manufacture of 4,4'-diphenyl-methane diisocyanat

1980-08-15

1981-10-13

Torrence, Dolph H.

Distillation: processes, separatory

Plural distillations performed on same material

One a filming distillation

203 74, 203 75, 203 81, 203 82, 203 87, 260453SP, 260453AM, B01D 310, C07C119048

Patent

active

042946662

ABSTRACT:
A process for the manufacture of 4,4'-diphenylmethane diisocyanate and a mixture of diphenylmethane diisocyanate isomers containing a controllable amount of uretdione and hydrolizable chlorine which comprises feeding crude MDI to an evaporator, condensing a head fraction in two stages in the presence of an inert gas, feeding the first stage condensate to a distillation column, producing a mixture of diphenylmethane diisocyanate isomers as an overhead, producing 4,4'-diphenylmethane diisocyanate as a side draw, and condensing each of the overhead and side draw in two stages in the presence of an inert gas.

REFERENCES:
patent: 3658656 (1972-04-01), Adica et al.
patent: 3857871 (1974-12-01), Hatfield et al.
patent: 4118410 (1978-10-01), Friedel et al.
patent: 4189354 (1980-02-01), Ellendt et al.

Affiliated with

Also associated with

Rating

Process for the manufacture of 4,4'-diphenyl-methane diisocyanat does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the manufacture of 4,4'-diphenyl-methane diisocyanat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the manufacture of 4,4'-diphenyl-methane diisocyanat will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-929493