Basf Se Corporation

Boris Buschhaus

Johann-Peter Melder

Robert Baumann

Gordon Brasche

Hermann Luyken

Rocco Paciello

Thomas Schaub

Stephanie Jaegli

Randolf Hugo

Martin Merger

Sebastian Ahrens

Mathias Schelwies

Jörg Pastre

Marion Kristina Brinks

Jens Baldamus

Thomas Krug

Markus Jegelka

Barbara Becker

Michael Lorenz

Alfred Oftring

Helmut B Witteler

Peter Pfab

Stephan Hüffer

Marion Kristina Da Silva

Stephan HÜFFER

The present invention relates to a process for preparing ethylenediamine (EDA), where the process comprises the steps a) to c). In step a), formaldehyde is reacted with hydrocyanic acid (HCN) to form formaldehyde cyanohydrin (FACH), where the hydrocyanic acid is completely free or largely free of sulfur dioxide (SO). The FACH prepared in this way is reacted with ammonia (NH) to form aminoacetonitrile (AAN) in step b), whereupon a hydrogenation of AAN in the presence of a catalyst to form EDA is carried out in step c).

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The present invention relates to a process for purifying ethylenediamine (EDA) by distillation, wherein the process comprises the steps a) and b). In step a), a mixture (G1) comprising water, EDA and N-methylethylenediamine (N-MeEDA) is fed into a distillation apparatus (D1), and the major part of the water comprised in the mixture (G1) is separated off overhead at a pressure of greater than 4.8 bara. From the bottom of (D1), the water-enriched mixture (G2) is fed into a distillation apparatus (D2) in step b). At the top of (D2), the major part of the N-MeEDA is distilled off. The stream (S3) obtained from the bottom of (D2) comprises EDA, with the components water and N-MeEDA comprised in the mixture (G1) having been largely or completely removed. Further distillation steps can optionally be carried out in order to obtain pure EDA, for example when diethylenetriamine (DETA) is additionally comprised in the mixture (G1). If ammonia is additionally comprised in the mixture (G1), an ammonia removal is preferably additionally carried out before carrying out the step a) in the process of the invention.

Method for the distillative purification of EDA

Process for preparing primary amines which have at least one functional group of the formula (&#x2014;CH&#x2014;NH) and at least one further primary amino group by alcohol amination of starting materials having at least one functional group of the formula (&#x2014;CH&#x2014;OH) and at least one further functional group (&#x2014;X), where (&#x2014;X) is selected from among hydroxyl groups and primary amino groups, by means of ammonia with elimination of water, wherein the reaction is carried out homogeneously catalyzed in the presence of at least one complex catalyst comprising at least one element selected from groups 8, 9 and 10 of the Periodic Table and also at least one donor ligand.

Process for preparing di-, tri- and polyamines by homogeneously catalyzed alcohol amination

Process for preparing alkanolamines which have a primary amino group (&#x2014;NH) and a hydroxyl group (&#x2014;OH) by alcohol amination of diols having two hydroxyl groups (&#x2014;OH) by means of ammonia with elimination of water, wherein the reaction is carried out homogeneously catalyzed in the presence of at least one complex catalyst comprising at least one element selected from groups 8, 9 and 10 of the Periodic Table and also at least one donor ligand.

Process for preparing alkanolamines by homogeneously catalyzed alcohol amination

A process for preparing EDDN and/or EDMN by conversion of FA, HCN and EDA, the reaction being effected in the presence of water, and, after the conversion, water being depleted from the reaction mixture in a distillation column, which comprises performing the distillation in the presence of an organic solvent which has a boiling point between water and EDDN and/or EDMN at the distillation pressure existing in the column or which forms a low-boiling azeotrope with water.

Process for preparing EDDN and EDMN

A process for reacting formaldehyde cyanohydrin (FACH) with ethylenediamine (EDA) in a reactor with limited backmixing at a temperature in the range from 20 to 120&#xb0; C., wherein the residence time in the reactor is 300 seconds or less.

Process for preparing EDDN and/or EDMN by conversion of FACH and EDA

A process is disclosed for separating the output from the reaction of EDDN or EDMN with hydrogen in the presence of THF, a catalyst, TETA or DETA, water, and optionally organic compounds having higher and lower boiling points than TETA or DETA. Hydrogen is removed, and the output is supplied to a distillation column DK1 in which an azeotrope, optionally comprising organic compounds with a boiling point lower than TETA or DETA, is removed from the top. A product comprising TETA or DETA is removed from the bottom and passed into a distillation column DK2, removing THF. A stream comprising TETA or DETA passes from the bottom of DK2. The DK1 azeotrope is condensed. Phase separation is induced by the addition of an organic solvent essentially immiscible with water, and the mixture is separated. The organic phase is recycled into DK1 and the water phase is discharged.

Process for working up reaction outputs from the hydrogenation of EDDN or EDMN

A process for reacting ethylenediamine-formaldehyde adduct (EDFA) and/or ethylene-diamine-monoformaldehyde adduct (EDMFA) with hydrogen cyanide (HCN) in a reactor with limited backmixing at a temperature in the range from 20 to 120&#xb0; C., wherein the residence time in the reactor is 300 seconds or less.

Process for preparing EDDN and/or EDMN by reacting EDFA and/or EDMFA with HCN

Process for the preparation of primary amines which have at least one functional group of the formula (&#x2014;CH&#x2014;NH) by alcohol amination of starting materials which have at least one functional group of the formula (&#x2014;CH&#x2014;OH), with ammonia, with the elimination of water, where the alcohol amination is carried out under homogeneous catalysis in the presence of at least one complex catalyst which comprises at least one element selected from groups 8 and 9 of the Periodic Table of the Elements, and also at least one phosphorus donor ligand of the general formula (I).

Process for the preparation of primary amines by homogeneously catalyzed alcohol amination

The invention relates to a process for the preparation of polyalkylenepolyamines by catalyzed alcohol amination, in which (i) aliphatic aminoalcohols are reacted with one another or (ii) aliphatic diamines or polyamines are reacted with aliphatic diols or polyols with the elimination of water in the presence of a catalyst.

Polyalkylenepolyamines by homogeneously catalyzed alcohol amination

Preparing a primary amine by alcohol amination of alcohol with ammonia and elimination of water includes reacting, in a homogeneously catalyzed reaction, a mixture of alcohol, ammonia, nonpolar solvent, and catalyst, in a liquid phase, to obtain a product mixture. The process then includes phase separating the product mixture into a polar product phase and a nonpolar product phase, and separating off the nonpolar product phase. At least some of the nonpolar phase returns to the homogenously catalyzed reaction. The process further includes separating off amination product from the polar product phase. At least some of the catalyst is in the nonpolar phase, and the catalyst accumulates in the nonpolar phase.

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.

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Mannheim, Germany

Boris Buschhaus