公开(公告)号：DE102005043799A1

公开(公告)日：2007-04-12

申请号：DE102005043799

申请日：2005-09-13

Applicant: BASF AG

Inventor： KLOETZER MATTHIAS ,  STROEFER ECKHARD ,  KRASE VOLKER ,  SCHMIDT ANDREAS ,  SCHERBEL PETER

IPC: C07C263/06 ,  C07B43/10

Abstract: The invention provides a multistage process for continuously preparing organic, distillable polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to low molecular mass monomeric polyurethanes, and thermally cleaving said polyurethanes, in which at defined reaction stages the polyisocyanates prepared and unusable residues are separated off, and reusable by products and intermediates are recycled to upstream stages.