Basf Aktiengesellschaft

Basf Aktiengesellschart

Basf Se Corporation

Hartmut Schoenmakers

Gerd Kaibel

Kaspar Bott

Hartmut Riechers

Matthias Rauls

Ortmund Lang

Arthur H&ouml;hn

Matthias Seiler

Joachim Simon

Werner Peschel

Ulrich Block

Dieter Wolf

Carsten Jork

Wolfgang Arlt

York Alexander Beste

Tanja Kirchner

Hartmut Staatz

Rudolf Schmidt

Koen Claerbout

Klaus Althaus

The invention relates to a process for distillatively purifying crude dimethylacetamide (crude DMAc) comprising DMAc, low boilers and high boilersby removing the low boilers and the high boilers to obtain pure DMAc in one of the column configurations listed hereinbelow:

Method for the purification of dimethylacetamide (DMAc)

Process for working up a bottom stream wherein high boilers and ionic liquid from an extractive rectification in which the ionic liquid is used as entrainer. The process includes feeding the bottom stream to an evaporation stage which is operated at a pressure of less than 500 mbar or to a stripper which is operated through use of inert gas or steam, and the major part of the high boiler present is separated off in vapor form from the ionic liquid.

Recycling of ionic liquids produced in extractive distillation

Pure triethylenediamine (TEDA) is prepared by vaporizing TEDA, introducing the gaseous TEDA into a liquid solvent and subsequently crystallizing the TEDA from the solution obtained in this way.

Preparation of pure triethylenediamine

Anhydrous or substantially anhydrous formic acid is obtained by hydrolysis of methyl formate, in a process wherein

Production of anhydrous or substantially anhydrous formic acid

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Dossenheim, Germany

Hartmut Schoenmakers