Integrated process for the preparation of methylene...

Details Integrated process for the preparation of methylene... Integrated process for the preparation of methylene...

C - Chemistry, Metallurgy

07

C

260/455.7

C07C 263/00 (2006.01) C07C 263/06 (2006.01) C07C 265/14 (2006.01) C07C 275/28 (2006.01)

Patent

CA 2017660

ABSTRACT OF THE DISCLOSURE A process is presented for a multi-step process for the preparation of methylene diphenylene diisocyanates (MDI) or polymethylene polyphenylene poly (isocyanates) (PMDI) from methylene diphenylene diamines or polymethylene polyphenylene polyamines and isocyanic acid to form ureas which are reacted with dialkyl amines to give a corresponding dialkyl urea or poly (alkyl urea) product which are then thermally reacted in the presence of various reaction promoters to give the corres- ponding isocyanate MDI or PMDI product.

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