Basf Aktiengesellschaft

Basf Se Corporation

Jan D Jacobs

Filip Deberdt

Eckhard Stroefer

Martin Sohn

Ulrich Penzel

Wolfgang Mackenroth

Hans-Juergen Pallasch

Filip Nevejans

Peter Van Den Abeel

Rolf Pinkos

Klaus Harth

Ulrich Steinbrenner

Christian Walsdorff

Kai Thiele

Eckhard Ströfer

Helmut Moehwald

Martin Fiene

Veronika Quaschning

Klaus; Harth

The invention relates to a process for the partial or complete separation of a mixture comprising hydrogen chloride and phosgene, possibly solvents and possibly low boilers and inerts as are typically obtained in the preparation of isocyanates by reaction of amines with phosgene, which comprises firstly carrying out a partial or complete condensation of phosgene, then a distillation or stripping step in a column to remove the hydrogen chloride from the bottom product phosgene and subsequently a scrub of the top product hydrogen chloride by means of the process solvent to absorb the phosgene in the process solvent. An after-purification by means of adsorption on activated carbon or by another suitable method can subsequently be carried out to remove solvent residues.

Separation of a substance mixture consisting of hydrogen chloride and phosgene

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.

Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent

A process is described for preparing diaminodiarylmethanes comprising the steps

Method for the production of diaminodiarylmethanes

Process for preparing organic isocyanates, which comprises the steps

Integrated process for preparing isocyanates

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Baton Rouge, LA, United States of America

Jan D Jacobs