Basf Aktiengesellschaft

Basf Se Corporation

Werner Peschel

Bernd Bessling

Matthias Kummer

Michael Keil

Ulrich Müller

Randolf Hugo

Harald Rust

Horst Hartmann

Rainer Papp

Thomas Hill

Peter Reuter

Till Adrian

Uwe Stabel

Josef Wahl

Frank Heimann

Peter M Lorz

Thomas R&uuml;hl

Arnd Böttcher

Bernd Bartenbach

Hartmut Schoenmakers

Tanja Kirchner

Bernhard Ulrich

Jean Werner Knab

Hartmut Staatz

Klaus Althaus

Harry Zachmann

Michael Jäger

Axel Hildebrandt

Marcus Bechtel

Process for the preparation of on-spec phthalic anhydride by the distillative purification of crude phthalic anhydride at reduced pressure, where the crude phthalic anhydride is passed to the distillation column above a side take-off, the low-boiling components are removed at the top of the column or in the vicinity of the top of the column and the on-spec phthalic anhydride is removed from the side take-off of the column, in which a distillation column is used whose number of theoretical plates located above the supply of the crude phthalic anhydride into the distillation column is 10 to 20 and the column is operated at a reflux ratio of from 0.1 to 0.5.

Method for producing phthalic anhydride that conforms to specifications

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)

A process for preparing cyclohexanol from benzene by:

Method for the production of cyclohexanol from benzene

A continuous process for the preparation of monoethanolamine, diethanolamine and triethanolamine by reacting ammonia and ethylene oxide in liquid phase in the presence of water as catalyst in a pressure column is proposed, where, as a result of the heat of the reaction, some of the ammonia evaporates, condenses at the head of the column and is again charged to the column, the reaction mixture at the bottom end of the pressure column is drawn off and then separated, the pressure column is constructed as a reactive distillation column (I) with evaporator at the bottom (S) and where, by means of inputting energy via the evaporator at the bottom (S), the weight ratio of monoethanolamine to diethanolamine to triethanolamine is controlled and, via the ratio of ammonia to ethylene oxide in the feed to the reactive distillation column (I), the ammonia proportion in the bottom product from the reactive distillation column (I) is controlled.

Continuous preparation of monoethanolamine, diethanolamine and triethanolamine

On-spec phthalic anhydride is prepared by distillative purification of crude phthalic anhydride by a process in which crude phthalic anhydride is fed to a distillation column which is operated at reduced pressure, the low boilers are removed at the top or in the vicinity of the top of the distillation column and the on-spec phthalic anhydride is removed from the column via a side take-off.

Method for producing phthalic anhylic anhydride according to specifications

The present invention relates to a process for the continuous preparation of methoxyamine hydrochloride by cleavage of acetone oxime methyl ether by means of hydrogen chloride and water, wherein the cleavage is carried out in a reaction column having less than 20 theoretical plates and the amount taken off at the top is set to at least 30% of the amount of feed.

Method for the continuous production of methoxyamine hydrochloride

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Freinsheim, Germany

Werner Peschel