Basf Aktiengesellschaft

Basfaktiengesellschaft

Basf Aktiengsellschaft

Toni Dockner

Uwe Kempe

Herbert Krug

Gerhard Nestler

Manfred Sauerwald

Anton Frank

Helmut Karn

Helmut Lermer

Hermann Koehler

Herbert Exner

Karl Gerhard Baur

Matthias Wetzler

Ernst-Heinrich Pommer

Klaus Ebel

Wolfgang Hoelderich

Holger Herbst

Albrecht Dams

Peter Magnussen

J&uuml;rgen Mohr

Werner Praetorius

Christiane Potthoff

Rolf Hartmuth Fischer

Helmut Hagen

Alexander Weck

Rolf Platz

Matthias Irgang

Gabriele Iffland

Ulrich Rauh

Willi Schmidt

Matthias Geisendorfer

Hans Joachim Szymanski

Bernd Ruge

Franz Merger

Norbert Goetz

Michael Hesse

Wolfgang Rohr

Reinhold J Leyrer

Rolf Fikentscher

Peter Zehner

Otto Machhammer

Matthias Schwarzmann

Werner Steck

Juergen Schroeder

Harald Rust

Harro Petersen

Eckhard Hickmann

Hans Rupert Merkle

Gernot Reissenweber

Heinrich Aichinger

Thomas Loerzer

Claus-Ulrich Priester

Arend Jouke Kingma

Wolfgang Spiegler

Juergen Mohr

Herbert Toussaint

Klaus Mundinger

Hans Martan

Uwe Vagt

Regina Benfer

Stefan Koser

Juergen Frank

Theo Proll

Martin Decker

Herbert Vogel

Stefan Birnbach

Hans-Martin Hutmacher

Wolfgang Kasel

Hans-Heinrich Bechtolsheimer

Heinz Nohe

Helmut Fleig

Jarren Peters

Werner Weinle

Thomas Bluemel

Carsten Groening

Klaus Bittins

Ulrich Kanne

Charles Schommer

Juergen Dressel

Walter Bieg

Thomas Papkalla

Carsten Groning

Hans Leitner

Gisela Hieber

Ewald Gallei

Jost H Manegold

Reinhard Herzog

Albrecht H Wallis

Gundo Brauch

Erich K Fehr

Jurgen Heners

Helmut Schwarz

Friedrich W Kohlmann

Rolf Schlick

Rainer Thomas

Gerd-Jurgen Engert

Stefan Martin

Hans Klink

Armin Brucker

Joachim Bader

Hans-Martin Mugrauer

Method for separating alkali metal ions from alkoxylates

A process for preparing bisphenol alkoxylates comprises reacting at least one bisphenol with alkylene oxide in the presence of a phosphine catalyst which is essentially free of alkali metal hydroxide.

Method for producing bisphenol alcoxylates

In a process for isolating alkylene glycol having a low aldehyde content, in which a mixture comprising alkylene glycol is subjected to a final distillation, formic acid or a formate or a mixture of two or more formates or a mixture of formic acid and one or more formates is present in the mixture comprising alkylene glycol.

Method for producing alkylene glycol with a low carbonyl compound content

A process for the continuous production of 1,3-dioxolan-2-ones such as ethylene carbonate or propylene carbonate by reacting a corresponding oxirane with carbon dioxide in the liquid phase in the presence of a catalyst comprises conducting the reaction in a two-part reactor in whose first part the reaction is taken with backmixing to a conversion of not less than 80% of the oxirane II and in whose second part the reaction is completed under nonbackmixing conditions, and passing the carbon dioxide in countercurrent to the oxirane II in the entire reactor.

Method for the continuous production of 1,3-dioxolan-2-ones

In a process for preparing alkoxylated amines or alcohols in which a reaction mixture comprising an amine or an alcohol or a mixture of two or more amines and/or alcohols and an alkylene oxide, or a mixture of two or more different alkylene oxides, is reacted in one or more successive reaction steps, at least one of the reaction steps is carried out in the presence of a basic catalyst and, in at least one of the reaction steps, formic acid or a salt of formic acid or a mixture of two or more thereof is present in the reaction mixture or the reaction mixture is admixed with formic acid or a salt of formic acid, or a mixture of two or more thereof, after the alkoxylation is complete. The alkoxylates prepared by the process of the present invention have a light color and a low odor.

Method for producing oxalkylated amines or alcohols

Crude (meth)acrylic acid is purified by a process in which a primary amine compound and an organic sulfonic acid are added to the crude (meth)acrylic acid and the latter is then worked up by distillation.

Purification of crude (meth) acrylic acid

In a process for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid with alkanols having from 1 to 8 carbon atoms in a homogeneous, liquid, solvent-free phase at elevated temperature and in the presence of an acid esterification catalyst, in which the (meth)acrylic acid, the alkanol and the acid catalyst are fed to a reaction zone, the water formed is removed by rectification during a residence time as constituent of a mixture comprising starting alkanol in a rectification unit (III) superposed on the reaction zone, the distillate obtained is separated into an organic phase comprising alkanol and an aqueous phase comprising water, the organic phase is essentially completely returned to the rectification unit (III), the reaction mixture is discharged from the reaction zone and conveyed into a distillative separation zone comprising further rectification units and in the latter the alkyl (meth)acrylate formed is separated off.

Continuous preparation of alkyl esters of (meth)acrylic acid

In a process for preparing .omega.-hydroxyesters of .alpha.,.beta.-unsaturated carboxylic acids, a vinyloxy ester of the carboxylic acid is treated with a strong acid in the presence of an alcohol, in particular a 1,2-diol or 1,3-diol.

Preparation of .omega.-hydroxyesiers of .alpha.,.beta.-unsaturated

In a process and an apparatus for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid and monohydric alkanols of 1 to 8 carbon atoms in the homogeneous, liquid, solvent-free phase at elevated temperatures and in the presence of an acidic esterification catalyst, by feeding the (meth)acrylic acid, the alkanol and the acid catalyst continuously to a reaction zone, the reaction zone consists of a cascade of at least two reaction regions connected in series, and the discharge stream of one reaction region forms a feed stream of a downstream reaction region. The cascade may have from two to four reaction regions is spatially separated from one another.

Continuous preparation of alkyl esters of (meth)acrylic acid and

In the process for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid with monohydric alkanols having from 1 to 8 carbon atoms in the presence of an acid esterification catalyst in a reaction zone, there is discharged from the reaction zone a product mixture which comprises the alkyl (meth)acrylate formed, the catalyst and the by-products formed during the course of the esterification having boiling points higher than that of the alkyl (meth)acrylate, and from which the alkyl (meth)acrylate is separated by distillation in a separation zone. The product mixture discharged from the reaction zone is fed to a rectification unit (I), in this unit the product mixture discharged is separated by rectification into at least one product (I) comprising the alkyl ester of (meth)acrylic acid and a product (II) comprising the catalyst, the product (I) is fed to a further rectification unit (II) and in this the alkyl ester of (meth)acrylic acid is separated off by rectification.

A process for preparing substituted imidazoles of the formula I ##STR1## R.sup.1, R.sup.2 and R.sup.3 are identical or different and are each hydrogen, halogen, NO.sub.2, CN or a C.sub.1 -C.sub.20 -hydrocarbon radical which is unsubstituted or substituted by one or more halogens or R.sup.1 and R.sup.2 together are members of a 3- to 20-membered hydrocarbon ring which is unsubstituted or substituted by one or more halogens and/or C.sub.1 -C.sub.8 -alkyl groups and which may contain 1, 2 or 3 heteroatoms from the group consisting of nitrogen, oxygen and sulfur, and

Aqueous phase process for preparing N-substituted imidazoles

A process for preparing acrylic acid and/or esters comprises the steps of:

Preparation of acrylic acid and esters

In a process and an apparatus for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid and monohydric alkanols of 1 to 8 carbon atoms in the homogeneous, liquid, solvent-free phase at elevated temperatures and in the presence of an acidic esterification catalyst, by feeding the (meth)acrylic acid, the alkanol and the acid catalyst continuously to a reaction zone, the reaction zone consists of a cascade of at least two reaction regions connected in series, and the discharge stream of one reaction region forms a feed stream of a downstream reaction region. The cascade may have from two to four reaction regions spatially separated from one another.

The continuous esterification of a C.sub.1 -C.sub.8 -alkanol with (meth)acrylic acid in a molar ratio of from 1:1 to 2:1 in the presence of proton-donating catalysts in a homogeneous, liquid, solvent-free phase, in which the water of reaction and resulting alkyl (meth)acrylate are separated off continuously as part of an aqueous azeotropic mixture via the top of a rectification zone attached to the reaction zone, at a top pressure of from 0.1 to 1 atm, and worked up to give pure (meth)acrylate, is carried out by a process wherein the reaction temperature is from 100.degree. to 150.degree. C., the residence time is from 1 to 5 hours and from 5 to 20% by weight, based on the amount of reaction mixture, of sulfuric acid or an equimolar amount, based on such an amount of sulfuric acid, of an organic sulfonic acid is added as a protic acid catalyst to the reaction mixture present in the reaction zone.

Continuous preparation of alkyl esters of (meth) acrylic acid

A diester of (meth)acrylic acid with a C.sub.4 -C.sub.6 -alkanediol is separated from a mixture which essentially consists of the C.sub.4 -C.sub.6 -alkanediol, the monoester of (meth)acrylic acid with the C.sub.4 -C.sub.6 -alkanediol and the diester of (meth)acrylic acid with the C.sub.4 -C.sub.6 -alkanediol by extraction with an organic solvent in the presence of water, by a process in which the diester-containing mixture is added continuously in the middle section of an extraction column and in addition water and the organic extracting agent are passed continuously countercurrent in the extraction column.

Separation of a diester of (meth)acrylic acid with a C.sub.4 -C.sub.6

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Meckenheim, Germany

Toni Dockner