公开(公告)号：DE59603028D1

公开(公告)日：1999-10-21

申请号：DE59603028

申请日：1996-01-02

Applicant: BASF AG

Inventor： BAUR KARL G ,  BRUNNER ERWIN ,  BRANDT ECKHARDT

IPC: C07D307/89 ,  B01D3/14 ,  C07C51/573 ,  C07C63/68

公开(公告)号：CA2094484C

公开(公告)日：1997-10-07

申请号：CA2094484

申请日：1993-04-20

Applicant: BASF AG

Inventor： OTTERBACH ANDREAS ,  SCHWARZ HANS VOLKMAR ,  MERGER FRANZ ,  MAGNUSSEN PETER ,  SCHWARZ WOLFGANG ,  BRANDT ECKHARDT ,  MATTNER OTTO

IPC: C08G18/72 ,  C07C263/00 ,  C07C263/04 ,  C07C263/20 ,  C07C265/00 ,  C07C265/04 ,  C07C265/10 ,  C07C265/14 ,  C08G71/00 ,  C08G71/04

Abstract: A multistep process for the continuous preparation of organic polyisocyanates, preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to give monomeric polyurethanes and pyrolyzing the latter involves separating the resultant polyisocyanates and worthless residues in certain reaction steps and recycling the reusable by-products into earlier steps.