Basf Aktiengesellschaft

Basf Se Corporation

Karl-Heinz Ross

Johann-Peter Melder

Christian Dudeck

Boris Breitscheidel

Tom Witzel

Manfred Julius

Hans Diem

Werner Fliege

Gunter Lehmann

Hermann Luyken

Rolf-Hartmuth Fischer

Guido Voit

Peter Stops

Gerhard Schulz

Erhard Henkes

Rainer Becker

Wolfgang Harder

Walter Himmele

Alexander Weck

Martin Ernst

Thomas Krug

Wilhelm Ruppel

Steffen Maas

Michael Schulz

Frank Ohlbach

Andreas Henne

Heinz-Josef Kneuper

Udo Rheude

Petr Kubanek

Marco Bosch

Wolfgang Mägerlein

Horst Neuhauser

Theodor Weber

Axel Paul

Franz-Josef Mueller

Frank Poplow

Martin Rudloff

Bernd Meissner

Steffen Oehlenschläger

Norbert Petri

G&uuml;nther Ruider

Helmut Schmidtke

Wolfgang Sauer

Peter Wahl

Wolfgang Steiner

Ludwig Wambach

Hans-Jurgen Weyer

Heinz Ruetter

Roderich Röttger

Rolf Lebkücher

Sylvia Huber

Harro Wache

Werner Reutemann

Frank Gutschoven

Otto Kratzer

Wolfgang Muehlthaler

Philip Buskens

Frank Kuhnke

Horst Grafmans

Rolf Lebkuecher

Wolfgang Gunkel

Heinz Rütter

Roland Deeg

Helmut Berrsche

J&ouml;rg Liebe

Heike Maier

Gerhard Ruf

Gunter Boettger

Gunther Ruider

Jan Eberhardt

Rolf Wambsganss

A process for preparing N,N-dimethylacetamide (DMAC) by continuously reacting methyl acetate (MeOAc) with dimethylamine (DMA) in the presence of a basic catalyst, wherein MeOAc is used in the form of a methanolic solution which is obtained as a by-product in the preparation of polyTHF by transesterifying polyTHF diacetate with methanol.

Method for the production of N,N-dimethylacetamide (DMAC)

The invention relates to a method of avoiding corrosion in the separation of methylamine from a product stream () which is obtained in the preparation of methylamines by gas-phase reaction of methanol and ammonia and includes monomethylamine, dimethylamine, trimethylamine, ammonia and methanol as components, where ammonia is separated off by pure distillation in a first column (), the remaining components of the product stream obtained as bottoms () are fed to a second column (). Trimethylamine () is separated off in the second column () by extractive distillation with introduction of water. The further of the product stream obtained as bottoms () from the second column () are fed to a third column (), in which monomethylamine and dimethylamine are separated off at the top. The monomethylamine and dimethylamine are separated by distillation in a fourth column (). To avoid corrosion alkali metal hydroxide is added to the second or third column ().

Method for avoiding corrosion

Process for the continuous preparation of N-methyl-2-pyrrolidone (NMP) by reacting gamma-butyrolactone (GBL) with monomethylamine (MMA) in the liquid phase, wherein GBL and MMA are used in a molar ratio of from 1:1.08 to 1:2 and the reaction is carried out at from 320 to 380&#xb0; C. and an absolute pressure of from 70 to 120 bar.

Method for the continuous production of N-methyl-2-pyrrolidone (NMP)

A process for continuously preparing 2-pyrrolidone by reacting gamma-butyrolactone with ammonia in the liquid phase in the presence of water, wherein the reaction is carried out at a temperature of from 275 to 300&#xb0; C. and an absolute pressure of from 140 to 180 bar.

Method for the production of 2-pyrrolidone

Method of purifying triethanolamine prepared by reacting aqueous ammonia with ethylene oxide in the liquid phase under pressure and at elevated temperature by removing excess ammonia, water and monoethanolamine from the reaction product, reacting the resulting crude product with ethylene oxide at temperatures of from 110 to 180&deg; C., and then rectifying the mixture in the presence of phosphorous or hypophosphorous acid or compounds thereof.

Method of purifying triethanolamine

N-Methyl-2-pyrrolidone (NMP) is prepared by preparing a mixture comprising monomethylamine, dimethylamine and trimethylamine and ammonia in a first process step by reacting ammonia with methanol at elevated temperature in the presence of a catalyst, separating 10 off the ammonia, reacting the mixture comprising the methylamines with gamma-butyrolactone (&ggr;-BL), in a molar ratio of monomethylamine to &ggr;-BL of at least 1 in a second process step at elevated temperature and superatmospheric pressure, separating NMP and unreacted methylamines from the reaction product and returning unreacted methylamines to the first process step for reaction with methanol and ammonia.

Preparation of N-methyl-2-pyrrolidone (NMP)

Preparation of alkanolamines having improved color quality by treating the alkanolamine with an effective amount of phosphorous acid or hypophosphorous acid or compounds thereof initially at elevated temperature over a period of at least 5 min (step a), and then distilling it in the presence of an effective amount of one of these phosphorus compounds (step b).

Process for the preparation of alkanolamines having improved color quality

Preparation of alkanolamines having improved color quality by treating the alkanolamine with hydrogen in the presence of a hydrogenation catalyst at elevated temperature, by using, as hydrogenation catalyst, a heterogeneous catalyst comprising Re, Ru, Rh, Pd, Os, Ir, Pt and/or Ag and a support material chosen from the group consisting of activated carbon, alpha-aluminum oxide, zirconium dioxide and titanium dioxide, where the catalyst, in the case of activated carbon as support material, has a cutting hardness of at least 10 N, a side crushing strength of at least 30 N or a compressive strength of at least 25 N.

Halides are removed from halide-containing nitrile mixtures by

Removal of halides from halide-containing nitrile mixtures

A process for the preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine having a cis/trans isomer ratio of at least 70:30 by

Preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine having a

A method for increasing the shelf life of liquid hydroxy- and alkoxyalkyl ketones by adding from 0.0001 to 1% by weight of a base is described.

Method and composition to increase the life of Liquid hydroxy-and

A process for the preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine from 3-cyano-3,5,5-trimethylcyclohexanone which requires three spatially separated reaction spaces, in order to carry out the following three steps in sequence: a) reacting the 3-cyano-3,5,5-trimethylcyclohexanone with excess ammonia on acidic metal-oxide catalysts in a first reaction space at from 20.degree. to 150.degree. C. and from 50 to 300 bar, b) hydrogenating the resultant reaction products using hydrogen in a second reaction space in the presence of excess ammonia and preferably liquid ammonia on hydrogenation catalysts, optionally using basic components or on neutral or basic supports at from 50.degree. to 100.degree. C. and at from 50 to 300 bar, and c) hydrogenating the resultant reaction products in the presence of hydrogen and also ammonia in a third reaction space on hydrogenation catalysts, optionally using basic components or on neutral or basic supports at from 110.degree. to 160.degree. C. and at from 150 to 300 bar. These three steps in sequence provide a substantially complete reaction of the original 3-cyano-3,3,5-trimethylcyclohexanone reactant with a yield of 96% of the desired diamino product in which the cis-content of the diamine is 70%.

Preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine

A process for the preparation of a color-stable dialkylaminoethanol of the formula ##STR1## in which R.sup.1 and R.sup.2 independently are C.sub.1 -C.sub.20 -alkyl, by reacting ethylene oxide with a dialkylamine of the formula HNR.sup.1 R.sup.2, in which R.sup.1 and R.sup.2 have the same meaning, in the presence of from 2.5 to 50% by weight of water, based on the reaction mixture, at a temperature of from 95.degree. to 170.degree. C., and separating off the water and high-boiling constituents by distillation under a reduced pressure and at a temperature of from 40.degree. to 90.degree. C. at the column bottom.

Preparation of a pure dialkylaminoethanol stable against discoloration

A process for the preparation of methyl formate by reacting methanol and carbon monoxide in the presence of an alkali metal alcoholate or alkaline earth metal alcoholate at from 30.degree. to 150.degree. C. and from 50 to 300 bar, wherein a nonionic complexing agent is used to bind the alkali metal cations or alkaline earth metal cations.

Preparation of methyl formate

A process for the preparation of the sought-after scent 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one, and novel intermediates for the preparation of this compound. 2,5-Dimethyl-4-hydroxy-2,3-dihydrofuran-3-one is prepared by first epoxidizing hex-3-ene-2,5-diol in the liquid phase with hydrogen peroxide to give the novel compound 3,4-epoxy-hexane-2,5-diol, which at 40.degree.-280.degree. C. is converted, by means of a catalytic amount of an acid, to the novel compound 2,5-dimethyl-3,4-dihydroxy-tetrahydro-furan. The latter is dehydrogenated by means of oxygen over a silver catalyst or copper catalyst to give the nove compound 2,5-dimethyl-4-hydroxy-tetrahydrofuran-3-one, which is oxidized by means of bismuth oxide, in concentrated acetic acid solution, to give the desired compound 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one.

Preparation of 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one

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Grünstadt, Germany

Karl-Heinz Ross