Basf Aktiengesellschaft

Basf Se Corporation

Gerhard Fritz

Johann-Peter Melder

Hardo Siegel

Thomas Hill

Thilo Hahn

Jan Kurt Eberhardt

Volkmar Menger

Rolf Pinkos

Klaus Ebel

Gerd Kaibel

Werner Steck

Harald Rust

Christophe Bauduin

Manfred Eggersdorfer

Axel Paul

Helmut Lermer

J&ouml;rg Therre

Helmuth Menig

Carsten Gr&ouml;ning

J&uuml;rgen Koopmann

Rainer Dietz

Hans Wagner

Karl Fisher

Jan Eberhardt

A process for preparing a diamine from a corresponding aminoalkyl nitrile, which is prepared by reaction of a corresponding monoamine with a corresponding alkenyl nitrile in a continuous mode of operation, comprising the steps: a) introduction of the corresponding monoamine into a continuously conveyed reaction stream; b) introduction of the corresponding alkenyl nitrile into the reaction stream, with this already comprising the aminoalkyl nitrile on addition; c) reaction of the reaction stream in a first reaction region; d) at least partial transfer of the reaction stream into at least one second reaction region for further reaction; e) discharge of the reaction stream from the second reaction region after the reaction; f) introduction of the reaction stream discharged in step (a) into a reduction region; and g) reduction of the aminoalkyl nitrile present in the reaction stream to the corresponding diamine.

Process for preparing aminoalkyl nitriles and diamines from such nitriles

The process relates to a process for preparing delta-valerolactone (VLO) in the gas phase by catalytic dehydrogenation over at least two different catalysts.

Process for preparing delta-valerolactone in the gas phase

The present invention relates to a process for preparing an aminoalkyl nitrile by reaction of a corresponding monoamine with a corresponding alkenyl nitrile in a continuous mode of operation, which comprises the steps The invention further relates to a process for preparing a diamine from the aminoalkyl nitrile, suitable apparatuses for carrying out the processes and their corresponding use.

Process for preparing aminoalkylnitriles and diamines from such nitriles

In a process for the preparation of methylglyoxal dimethyl acetal from methylglyoxal and methanol in the presence of an acidic ion exchanger, water is introduced in an amount sufficient to form an acidic reaction mixture in which the acetal product and water form an azeotropic mixture, with or without the retention of some methanol reactant. After subjecting a single phase acidic reaction mixture to an azeotropic distillation, it will separate into two distinct liquid phases with a simple recovery of the acetal product from the aqueous phase.

Preparation of methylglyoxal dimethyl acetal

Synthesis of aliphatic C.sub.2 -C.sub.22 carboxylic acids by oxidation of relevant aldehydes with oxygen in the presence of alkali metal compounds or alkaline earth metal compounds in the liquid phase and separation of the reaction mixture by distillation, in which the bottom product formed during distillation and containing an alkali metal salt or alkaline earth metal salt is recycled to the oxidation stage.

Synthesis of aliphatic C.sub.2 -C.sub.22 carboxylic acids

Hydroxybenzaldehydes of the formula (I) are prepared from a benzaldehyde of the formula (II) or its acetal, in which R.sup.1 in the R.sup.1 O-phenyl ether group is an alkyl, cycloalkyl, alkylcycloalkyl or alkylaryl radical, R.sup.2 is H or OH or is identical to R.sup.1 and one or more R.sup.1 O-phenyl ether groups are ortho, meta or para to the aldehyde function, by a process in which a benzaldehyde of the formula (II) or its acetal, in which R.sup.1 and R.sup.2 have the abovementioned meanings and one or more R.sup.1 O-phenyl ether groups occupy the abovementioned position with respect to the aldehyde function, is converted into a hydroxybenzaldehyde of the formula (I) in the presence of water over a zeolite as a heterogeneous catalyst. ##STR1## The catalysts used are, in particular, zeolites of the pentasil type.

Preparation of hydroxybenzaldehydes

Esters of optically active 2-arylalkanoic acids I ##STR1## where Ar is an isocyclic or heterocyclic aryl radical and R.sup.1 and R.sup.2 are each C.sub.1 -C.sub.4 -alkyl, are prepared by subjecting an optically active ester II ##STR2## where X is Cl, Br or --O--SO.sub.2 --Y and Y is Cl or a hydrocarbon radical, to a Friedel-Crafts reaction with an aromatic compound ArH (III).

Preparation of esters of optically active 2-arylalkanoic acids

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Dannstadt-Schauernheim, Germany

Gerhard Fritz