Basf Aktiengesellschaft

Frank Ohlbach

Andreas Ansmann

Hermann Luyken

Peter Bassler

Johann-Peter Melder

Martin Merger

Rolf-Hartmuth Fischer

Rolf Hartmuth Fischer

Guido Voit

Alwin Rehfinger

Stefan Maixner

Frank Funke

Eberhard Fuchs

Christoph Benisch

Dieter Baumann

Till Gerlach

Arthur H&ouml;hn

Joachim Pfeffinger

Michael H&uuml;llmann

G&uuml;nther Achhammer

Klaus Ebel

Karl-Heinz Ross

Martin Rudloff

Helmut Winterling

Christoph N&uuml;bling

Günther Achhammer

J&ouml;rg Liebe

The invention relates to a method for separating by distillation a portion or the entirety of an azeptine derivative (III), which is selected from the group consisting of aminohexylidene imine, tetrahydroazepine, hexylhexahydroazepine and of aminohexylhexahydroazepine, out of a mixture (II) containing an azepine derivative (III) and an amine (I). The inventive method is characterized in that the distillation is carried out with a maximum bottom temperature of 150&#xb0; C.

Method for separating an azepine derivative out of a mixture containing an amine an azepine derivative

A material useful as catalyst for the hydrogenation of alpha, omega-dinitriles comprises

Hydrogenation catalyst

The invention relates to a method for removing, by distillation, 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, by a) removing the hexamethylenediamine from the mixture while obtaining a mixture (I) that has a hexamethylenediamine content of less than 1 wt. -%, b) removing completely or partially the 6-aminocapronitrile from mixture (I) while obtaining a mixture (II) whose content in substances that have a higher boiling point as 6-aminocapronitrile under distillation conditions and that cannot be formed by dimerization reactions when 6-aminocapronitrile is thermally treated is less than 1 wt. -%, and c) completely or partially removing from mixture (II) the hexamethylenediamine that might be present while obtaining a mixture (IV) whose hexamethylenediamine content is higher than that of mixture (II), and a mixture (V) whose hexamethylenediamine content is lower than that of mixture (II).

Method for removing 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine

A process is provided for the regeneration of a heterogeneous catalyst used for the preparation of compounds containing NHgroups by the hydrogenation, with hydrogen, of compounds containing at least one unsaturated carbon-nitrogen bond, wherein

Method for generating catalysts

A process for distillative removal of ammonia from solutions (I) which include a lactam and ammonia comprises effecting said removal in a distillation apparatus (a) at an absolute pressure of less than 10 bar.

Method for separating ammonia from solutions containing caprolactam and ammonia

A process for preparing a polymer, which comprises

Method for producing a polymer, using caprolactam

A material useful as catalyst for the hydrogenation of alpha, omega-dinitriles comprises (a) iron or a compound based on iron or mixtures thereof, (b) from 0.001 to 0.3% by weight based on (a) of a promoter based on 2, 3, 4 or 5 elements selected from the group consisting of aluminum, silicon, zirconium, titanium and vanadium, (c) from 0 to 0.3% by weight based on (a) of a compound based on an alkali and/or alkaline earth metal, and also (d) from 0.001 to 1% by weight based on (a) of manganese.

Method for reducing the content of an unsaturated amine in a mixture containing an amine and a nitrile

Passivated iron useful as catalytically active component after activation is activated by hydrogen at elevated temperature and elevated pressure in the presence of a nitrile.

Method for activating passivated iron

Preparation of primary and secondary amines from nitriles

A polyamide is prepared by reacting at least one dinitrile and at least one diamine with water at a temperature from 90 to 400&deg; C. and a pressure from 0.1 to 50*10 Pa in a molar ratio of at least 1:1 for water to the sum total of dinitrile and diamine in the presence of a heterogeneous catalyst selected from the group consisting of aluminum oxide, tin oxide, silicon oxide, oxides of the second to sixth transition group of the periodic table, oxides of the lanthanides and actinides, sheet-silicates and zeolites.

Method for producing polyamides from dinitriles and diamines

Preparation of cyclic lactams

Method for the production of caprolactam

Preparation of caprolactam

The invention relates to a method for producing cyclic lactams of formula (II) by reacting a compound (I) of formula (I) with water in the presence of an organic, liquid dilution agent in the liquid phase. In formula (II), n and m respectively can have the values 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 and the sum of n&plus;m is at least 3, preferably at least 4 and R and R represent C -C alkyl, C -C cycloalkyl or C -C aryl groups. In formula (I), R , R , m and n are defined as above and R represents nitrile, carboxylic acid amide and carboxylic acid groups. The inventive method is characterized in that a) compound (I) is reacted with water in the liquid phase in the presence of an organic, liquid dilution agent (III) to form a mixture (IV) containing a lactam (II) and said mixture (IV) is subjected to an aqueous treatment to obtain a two-phase system.

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Dossenheim, Germany

Frank Ohlbach