Basf Aktiengesellschaft

Basf Se Corporation

Heinrich Aichinger

Gerhard Nestler

Holger Herbst

J&uuml;rgen Schr&ouml;der

Michael Fried

Albrecht Dams

Matthias Schwarzmann

Karl-Heinz Boehning

Klaus Herzog

Alexander Weck

Gabriele Iffland

Guenter Herrmann

Herbert Exner

Matthias Geisendorfer

Rolf Hartmuth Fischer

Wolfgang Hoelderich

Toni Dockner

Wilhelm Ruppel

Wolf D Mross

Stefan Beckmann

Lothar Karrer

Hans Martan

Gert Buerger

Johannes E Schmidt

Willi Schmidt

Hermann Wistuba

Hans-Dieter Eichhorn

Klaus Joachim M&uuml;ller-Engel

Fritz Naeumann

Juergen Plueckhan

Walter Scheidmeir

Rolf Seubert

Paul Leon Kageler

In a process for esterifying (meth)acrylic acid with an alkanol in the presence of an esterification catalyst, in which unconverted starting compounds and (meth)acrylic ester to be formed are separated off by distillation and an oxyester-containing bottom product is formed, the bottom product is first separated off and then the oxyesters contained in it are cleaved in the presence of a relatively long-chain alkylbenzenesulfonic acid at elevated temperatures.

Method for esterifying (meth)acrylic acid with an alkanol

Method of cleaning plant parts for the preparation or processing of (meth)acrylic esters

Free radical polymerizations immediately terminated by a process comprising the addition of an inhibitor solution which contains phenothiazine and at least 50% (w/w) N-alkylpyrrolidone to a system undergoing free radical polymerization, wherein the inhibitor solution also contains p-methoxyphenol (MEHQ).

Method of immediately terminating free-radical polymerisation processes

A method is described of stabilizing (meth)acrylic esters against unwanted free-radical polymerization, in which the mixture to be stabilized has added to it a polymerization inhibitor mixture comprising at least one nitroxyl radical and/or at least one organic compound having at least one nitroso group, and at least one p-phenylenediamine.

Process for stabilizing (METH)acrylic acid esters against unwanted radical polymerization

A supply system for feeding a fluid to a vessel ( ) is described, which is provided with a feedline ( ), having a reservoir which is filled with the fluid and a compressed-gas store ( ) which can be brought into communication with this reservoir ( ), in which system the reservoir ( ) and the compressed-gas store ( ) are arranged in immediate proximity to one another, and wherein the reservoir ( ) can, when required, be brought into communication with the feedline ( ) via connection pieces ( ).

Supply system for transferring a fluid to a container

Preparation of (meth)acrylates

A method of transporting and/or storing pure acrylic acid comprises ensuring by means of appropriate measures that the pure acrylic acid is partly crystalline during the entire duration of transport and/or storage.

Transport and/or storage of acrylic acid

Method for producing (meth)acrylic acid and (meth)acrylic acid esters

Pure acrylic acid is stored and/or transported by a process in which the pure acrylic acid is stored and/or transported as liquid aqueous solution at &lE;15&deg; C.

Method for storing and/or transporting pure acrylic acid

A method for continuous production of (meth)acrylic alkyl esters by reacting (meth)acrylic acid with alkanols containing 1-8 C-atoms, whereby raw (meth)acrylic acid containing acetic acid is used as a starting compound and the alkyl acetate that is formed as a by-product is evacuated in an appropriate area.

Method for continuous production of (meth)acrylic alkyl esters

Method for producing (meth) acrylic acid esters

The disclosure is a process for preparing (meth)acrylic esters by reacting (meth)acrylic acid with C,-C,-alkanols in the presence of a strong inorganic acid or of a C,-C,-monoalkyl ester of a polybasic strong acid as catalyst, which comprises removing the unconverted alkanol from the resulting reaction mixture by distillation and thereafter removing the catalyst from the resulting mixture.

Method for producing (meth)acrylic acid esters

A process is described for preparing (meth)acrylic esters by reacting (meth)acrylic acid with C,-C,-alkanols in the presence of sulfuric acid or a mono-C,-C,-alkyl sulfate as catalyst, where the catalyst is regenerated by extraction with water from the reaction mixture and the aqueous catalyst solution is recycled back to the esterification, the concentration of unreacted alkanol in the reaction mixture to be extracted being not more than 5% by weight, based on the reaction mixture to be extracted.

Method for the production of (meth)acrylic acid esters

In a process and an apparatus for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid with alkanols having from 1 to 5 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 catalyst are fed to a reaction zone, the water formed is removed by rectification during a residence time as constituent of a mixture comprising alkanol in a rectification unit superposed on the reaction zone, the distillate thus obtained is separated into an organic phase comprising alkanol and an aqueous phase comprising water, the organic phase is returned to the rectification unit, 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 esterifying (meth)acrylic acid with an alkanol in the presence of an acidic esterification catalyst, in which unconverted starting compounds and the (meth)acrylates to be formed are separated off by distillation and an oxyester-containing bottom product is formed, the bottom product is separated off and is heated in the presence of an acid to 150-250.degree. C. and the pressure is adjusted so that the cleavage products formed under the abovementioned conditions from the oxyesters contained in the bottom product evaporate directly. The process can be carried out in the presence of molecular oxygen. Mineral acids, for example sulfuric acid or phosphoric acid and/or alkanesulfonic or arylsulfonic acids, for example methanesulfonic acid or p-toluenesulfonic acid, can be added to the bottom product.

Esterification of (meth)acrylic acid with an alkanol

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Mannheim, Germany

Heinrich Aichinger