Preparation of organic polyisocyanates
AssigneeBASF SE
InventorsMatthias Klotzer, Volker Krase, Konrad Morgenschweis, Peter Pfab, Andreas Schmidt, Dieter Starosta
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Abstract
Organic polyisocyanates are prepared by a process in which polyurethanes are thermally dissociated in a dissociation reactor, a distillation is subsequently carried out and the bottom fraction obtained here is recirculated, wherein the recirculated bottom fraction is firstly fed at least partly into a reaction region and subsequently into the dissociation reactor.
Claims25
A process for preparing organic polyisocyanates in which polyurethanes are thermally dissociated in a dissociation reactor, a distillation is subsequently carried out and the bottom fraction obtained here is recirculated, wherein the recirculated bottom fraction is firstly fed at least partly into a reaction region and subsequently into the dissociation reactor.
An apparatus comprising at least one dissociation reactor and at least one rectification column for preparing organic polyisocyanates by thermal dissociation of polyurethane and subsequent distillation, wherein a heatable reaction region is located in at least one feed line to the dissociation reactor.
Dependencies are inferred from the claim text.