Multistage continuous preparation of cycloaliphatic...

Details Multistage continuous preparation of cycloaliphatic... Multistage continuous preparation of cycloaliphatic...

C - Chemistry, Metallurgy

07

C

C07C 263/06 (2006.01) C07C 265/14 (2006.01)

Patent

CA 2514375

Disclosed is a multistage process for continuous and phosgene-free preparation of a cycloaliphatic diisocyanate. The process comprises (A) reacting a cycloaliphatic diamine with urea to form cycloalkylenebisurea, (B) reacting the cycloalkylenebisurea with an alcohol to form a cycloalkylenediurethane, (C) removing high- and medium-boiling components (e. g. alcohol) from the cycloalkylenediurethane without removing high-boiling residues, (D) thermally cleaving the cycloalkylenediurethane to obtain the cycloaliphatic diisocyanate, while discharging a portion of the uncleaved cycloalkylenediurethane, (E) reurethanizing the discharged portion with the alcohol, (F) removing the high-boiling residues from the reurethanized product; and (G) recycling the purified reurethanized product. By adopting a two-stage reaction (A and B) to form the diurethane, the method realizes a low steady-state concentration of the high-boiling residues that are viscous and tend to form deposits.

Affiliated with

Also associated with

Rating

Multistage continuous preparation of cycloaliphatic... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multistage continuous preparation of cycloaliphatic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multistage continuous preparation of cycloaliphatic... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-2068193