Basf Aktiengesellschaft

Basf Se Corporation

Alfred Oftring

Charalampos Gousetis

Richard Baur

Stefan Birnbach

Wolfgang Trieselt

Johann-Peter Melder

Rolf Fikentscher

Gerold Braun

Alexander Kud

Randolf Hugo

Birgit Potthoff-Karl

Thomas Greindl

Kirsten Dahmen

Bernd Burkhart

Johannes Perner

Katrin Baumann

Thilo Hahn

Christian Ott

Martin Aus Dem Kahmen

Volker Schwendemann

Thomas Wehlage

Dieter Hannu Boeckh

Robert Baumann

Günter Oetter

Ekhard Winkler

Elisabeth Kappes

Juergen Schneider

Gerhard Wolf

Markus Christian Biel

Klaus Glaser

Werner Bochnitschek

Erwin Hahn

Christian Wulff

Heinrich Hartmann

Werner Bertleff

Guenter Oetter

Paul Klingelhoefer

G&uuml;nter Oetter

Michael Kneip

Andreas Deckers

Rainer Dyllick-Brenzinger

Armin Stamm

Jochen Wild

Juergen Detering

Karin H Beck

Thomas Schmidt

Matthias Rauls

Paul Diessel

Chung-Ji Tschang

Richard R Schmidt

Rudi Widder

Frank Rittig

Axel Franzke

Hans-Ulrich Jaeger

Helmut Wolf

Arnulf Lauterbach

Walter Denzinger

Hermann Luyken

Peter Zehner

Rolf-Hartmuth Fischer

Klemens Massonne

Oemer Uensal

Martin Ernst

Albert Hettche

Michael Kroener

Roland Ettl

Oliver Molt

Oral Aydin

Johannes P Dix

Alexander Panchenko

Frank Dietsche

Kai-Uwe Baldenius

Thomas Fetzer

Matthias Maase

Thomas Heidenfelder

Marta Reinoso Garcia

Wolfgang Reif

Gerhard Bauer

Peter Pfab

Dietrich Lach

Ortwin Schaffer

Sebastian Ahrens

Markus Hartmann

Hans-Helmut Goertz

Stephan Freyer

Ansgar Gereon Altenhoff

Werner Streit

Laszlo Szarvas

Oliver Borzyk

Rolf Streicher

Boris Buschhaus

Dieter Stoeckigt

Friedrich Vogel

Kati Schmidt

Theo Proll

Stephanie Jaegli

Willibald Schoenleben

Matthias Kummer

Roland Bou Chedid

Willi Schmidt

Mixture of L- and D-enantiomers of methyl glycine diacetic acid (MGDA) or its respective mono-, di or trialkali metal or mono-, di- or triammonium salts, said mixture containing predominantly the respective L-isomer with an enantiomeric excess (ee) in the range of from 10 to 75%.

Mixtures of MGDA enantiomers, and process for making such mixtures

The present invention relates to 2,6-bis(aminomethyl)piperidine derivatives as such (in the following text abbreviated to '2,6-BAMP derivatives') which are defined by the general formula (I) shown in the following text. In addition, the present invention relates to a process for preparing such 2,6-BAMP derivatives by hydrogenation of the corresponding 2,6-dicyanopiperidine derivatives (hereinafter abbreviated to '2,6-DCP derivatives') in the presence of a catalyst. The present invention further provides for the use of the 2,6-BAMP derivatives of the invention as hardeners for epoxy resins, as intermediate in the preparation of diisocyanates, which play an important role in the production of polyurethanes, as starters in the preparation of polyetherols and/or as monomers for polyamide production. The present invention further relates to the diisocyanates as such prepared from the 2,6-BAMP derivatives and also the corresponding preparative process.

2,6-bis-(aminomethyl)piperidine derivatives

Process for the preparation of racemic &#x3b1;-amino acids or of glycine, wherein the corresponding &#x3b1;-hydroxycarboxylic acid, selected from hydroxyacetic acid, lactic acid, malic acid, &#x3b1;-hydroxyglutamic acid, isocitric acid, tartronic acid and tartaric acid, or at least one salt of the corresponding &#x3b1;-hydroxycarboxylic acid is reacted in the presence of at least one heterogeneous catalyst which comprises at least one transition metal, in the presence of hydrogen with at least one nitrogen compound (c), where the nitrogen compound (c) is selected from primary and secondary amines and ammonia.

Process for the preparation of racemic alpha-amino acids

A process is proposed for the preparation of a crystalline L-MGDA trialkali metal salt by crystallization from an aqueous solution thereof which has been obtained by Strecker synthesis, starting from L-&#x3b1;-alanine, by reaction with formaldehyde and hydrocyanic acid to give L-&#x3b1;-alanine-N,N-diacetonitrile and subsequent alkaline saponification of the L-&#x3b1;-alanine-N,N-diacetonitrile to give the L-MGDA trialkali metal salt, wherein a temperature of 150&#xb0; C. is not exceeded during the alkaline saponification.

Process for the preparation of a crystalline L-MGDA trialkali metal salt

The present invention relates to a process for preparing ether carboxylates.

Preparing ether carboxylates

A process for preparing an aqueous solution of a methylglycine-N,N-diacetic acid trialkali metal salt at a high yield and purity by Strecker synthesis, the process including: reacting an aqueous solution containing &#x3b1;-alanine with formaldehyde and hydrocyanic acid, to obtain &#x3b1;-alanine-N,N-diacetonitrile in one reaction unit; and saponification of the &#x3b1;-alanine-N,N-diacetonitrile with a base, to obtain the methylglycine-N,N-diacetic acid trialkali metal salt, wherein the &#x3b1;-alanine is partially neutralized and the addition of formaldehyde and hydrocyanic acid are controlled such that a concentration of free hydrocyanic acid in the liquid reaction mixture at any time is limited such that secondary reactions that produce formaldehyde cyanohydrin, consecutive reactions of formaldehyde cyanohydrin, and the polymerization of hydrocyanic acid, only occur insofar as the specification requirements, such as nitrilotriacetic acid content and color, for methylglycine-N,N-diacetic acid trialkali metal salts are observed.

Process for the preparation of aqueous solutions of methylglycine-N,N-diacetic acid trialkali metal salts

The present invention relates to a process for preparing aminopolycarboxylates proceeding from an amino acid which, in a first process step is reacted with ethylene oxide to give an intermediate mixture comprising the corresponding dialkanolamine, and then the intermediate mixture, in a second process step is converted catalytically using a base to the corresponding aminopolycarboxylate, wherein the amino acid, before the reaction with ethylene oxide in the first process step, is supplied to a partial neutralization with 0.70 to 0.99 equivalent of base per acid group, or, in the first process step, an amino acid which has already been partly neutralized with 0.70 to 0.99 equivalent of base per acid group is used.

Process for preparing aminopolycarboxylates proceeding from amino acids

The present invention relates to an improved process for batchwise or continuous isomerization of cis-2-pentenenitrile to 3-pentenenitriles in the presence of 1,4-diazabicyclo[2.2.2]octane as catalyst.

Process for isomerization of cis-2-pentenenitrile to 3-pentenenitriles

A process for preparing aminopolycarboxylates proceeding from the corresponding polyalkanolamines by oxidative dehydrogenation in the presence of a catalyst comprising 1 to 90% by weight of copper, based on the total weight of the catalyst, using a base, which comprises first performing a partial conversion of the polyalkanolamine to a reaction mixture comprising the aminopolycarboxylate at a temperature in the range from 140 to 180&#xb0; C. until at least 10 to 90 mol% of the polyalkanolamine has been depleted, and then continuing the conversion at elevated temperature.

Process for preparing aminopolycarboxylates

The present invention relates to 5-isopropyl-3-aminomethyl-2-methyl-1-aminocyclohexane (carvonediamine) and to a process for preparation thereof by a) reacting carvone with hydrogen cyanide, b) then reacting the carvonenitrile obtained in stage a) with ammonia in the presence of an imine formation catalyst and c) then reacting the carvonenitrile imine-containing reaction mixture obtained in stage b) with hydrogen and ammonia over hydrogenation catalysts. The present invention further relates to the use of carvonediamine as a hardener for epoxy resins, as an intermediate in the preparation of diisocyanates, as a starter in the preparation of polyetherols and/or as a monomer for polyamide preparation.

5-isopropyl-3-aminomethyl-2-methyl-1-amino-cyclohexane (carvone diamine), and method for the production thereof

The invention relates to a process for preparing triethylenetetramine substituted by at least one methyl group (Me-TETA or methyl-substituted TETA compounds). Me-TETA is prepared by hydrogenating biscyanomethylimidazolidine (BCMI) in the presence of a catalyst. The present invention further relates to methyl-substituted TETA compounds as such. The present invention further relates to the use of methyl-substituted TETA compounds as a reactant or intermediate in the production of, for example, coatings or adhesives.

Methyl-substituted teta compounds

Provided is a method for the production of aminodicarboxylic acid N,N-diacetic acids of formula (I), wherein X is independently hydrogen or an alkali metal and n is 1 or 2. Aminodicarboxylic acid-N,N-diacetic acids of high purity can be yielded. The method involves: a) reacting an aminodicarboxylic acid, with 0.8 to 1.2 mole equivalents of formaldehyde and with 0.8 to 1.2 mole equivalents of hydrocyanic acid; b) reacting the reaction products of a) with 0.8 to 1.2 mole equivalents of hydrocyanic acid and with 0.8 to 1.2 mole equivalents of formaldehyde; c) hydrolyzing in the reaction product obtained in b).

Method for the production of aminodicarboxylic acid-N,N-diacetic acids

The invention relates to a process for preparing tetraethylenepentamine (TEPA) by hydrogenation of diethylenetriaminediacetonitrile (DETDN) over a catalyst. If appropriate, DETDN can also be present as a constituent of an amino nitrile mixture which additionally comprises diethylenetriaminemonoacetonitrile (DETMN).

Method for producing tetraethylenepentamine

The invention relates to a process for preparing triethylenetetramine (TETA), which, comprises the following steps:

Method for producing TETA by means of EDDN

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Bad Durkheim, Germany

Alfred Oftring