METHOD FOR SEPARATING OUT SOLVENT FROM A REACTION MIXTURE RESULTING FROM AN ISOCYANATE SYNTHESIS AND FOR PURIFYING THIS SOLVENT

The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction mixture leaving the reactor, wherein the solvent is separated off in a two-stage or multistage, preferably tw...

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Bibliographic Details
Main Authors PALLASCH, HANS-JUERGEN, STROEFER, ECKHARD, PENZEL, ULRICH, JACOBS, JAN D, SOHN, MARTIN, VAN DEN ABEEL, PETER, NEVEJANS, FILIP, DEBERDT, FILIP, MACKENROTH, WOLFGANG
Format Patent
LanguageEnglish
French
German
Published 20.01.2010
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction mixture leaving the reactor, wherein the solvent is separated off in a two-stage or multistage, preferably two-stage, distillation process in which the solvent is separated off at a pressure of 0.1-15 bar in a first apparatus and at 1-900 mbar in a second apparatus or further apparatuses, with the heat of condensation of the solvent vapor from the first apparatus being used for partial or complete vaporization of solvent in the second apparatus.
Bibliography:Application Number: EP20030785813