METHOD FOR SEPARATING OUT SOLVENT FROM A REACTION MIXTURE RESULTING FROM AN ISOCYANATE SYNTHESIS AND FOR PURIFYING THIS SOLVENT
摘要
<p>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.</p>
申请公布号
EP1575908(B2)
申请公布日期
2010.01.20
申请号
EP20030785813
申请日期
2003.12.13
申请人
BASF SE
发明人
SOHN, MARTIN;STROEFER, ECKHARD;NEVEJANS, FILIP;PENZEL, ULRICH;PALLASCH, HANS-JUERGEN;VAN DEN ABEEL, PETER;DEBERDT, FILIP;JACOBS, JAN D.;MACKENROTH, WOLFGANG