Basf Aktiengesellschaft

Basf Se Corporation

Volker Diehl

Juergen Schroeder

Ulrich Hammon

Ulrich Jaeger

Steffen Rissel

Volker Schliephake

Joachim Thiel

Klaus Joachim Mueller-Engel

Otto Machhammer

Claus Hechler

Klaus Joachim Müller-Engel

Jürgen Schröder

Mark Duda

Peter Stops

Christoph Adami

Karl Gerhard Baur

Markus Hoelzle

Erwin Brunner

Hans Hellbach

Knut Eger

Michael Blechschmitt

Peter Schlemmer

Silke Berndt

Ulrich Jäger

Horst Egly

Wolfgang Kasten

Veron Nsunda

Dimitrios Markopoulos

Thomas Buschulte

Bernd Hagen

Volker Huth

Axel Schroth

Klaus Jorg

A method of charging a vertical tube having an internal diameter of 50 mm or less with catalyst particles, which comprises introducing a filling aid into the vertical tube, where the filling aid comprises a flexible elongated body and the ratio of the cross section of the flexible elongated body to the cross section of the tube is from 0.003 to 0.08, and introducing the catalyst particles into the tube.

Method for filling a vertical tube with catalyst particles

A separating column containing a sequence of mass transfer trays that are supported by at least one covered double-T support and/or covered U-shaped support.

Thermal separating process

In process for cleaning tray columns which are used for the purposes of rectifiying liquids comprising (meth)acrylic compounds, a basic liquid is conveyed downward through the tray column and a gas is passed through the column in countercurrent to the basic liquid at an average gas phase differential pressure over all trays of at least 0.5 mbar/tray.

Cleaning of tray columns which have been used for rectificatively treating liquids comprising (meth)acrylic acid and/or esters thereof

A process for cleaning apparatus in which (meth)acrylic acid-containing organic solvents have been treated and/or generated and contain fouling and/or polymer and residues of organic solvent, in which the apparatus contents are subjected to a steam distillation in the apparatus.

Cleaning of apparatus in which meth(acrylic) acid-containing organic solvents have been treated and/or generated

A method of delivering a fluid containing at least one (meth)acrylic monomer by a pump in which a pump cavity and drive compartment are separated by a separator compartment filled with a barrier medium at elevated pressure and that is sealed with double-acting slide ring packings.

Method for conveying a liquid F containing at least one (meth)acrylic monomer

(Meth)acrylic monomers are separated by a thermal separation process by ascending at least one ascending gaseous stream in a separating column containing a sequence of mass transfer trays and a liquid stream that contains dissolved polymerization inhibitor which descends in the separating column, and in at least one of the streams being (meth)acrylic monomers; and spraying the inner surface of the separating column with the descending liquid stream that contains the dissolved polymerization inhibitor, and the separating column having internals, certain areas of which are shadow regions of the sprayed descending liquid stream; and which shadow regions are equipped by covering means which prevent contact of the shadow regions with (meth)acrylic monomers and consequently undesired polymerization of monomer.

&#x3b1;,&#x3b2;-ethylenically unsaturated aldehydes and/or carboxylic acids are prepared by means of a two-stage catalytic gas-phase oxidation in which a gas mixture comprising at least an alkane or alkene having from three to six carbon atoms and oxygen is subjected to a catalytic oxidation reaction, in the first stage (). oxygen is added to the gases produced in the first stage () and the resulting mixture is introduced into the second stage () in which it is subjected to a further catalytic oxidation reaction. In the process of the present invention, a signal which correlates with the oxygen content of the reaction gases before and/or after the addition of oxygen between the first and second stages () is generated and the oxygen addition is regulated as a function of the signal. Also provided are an apparatus for regulating a process for preparing &#x3b1;,&#x3b2;-ethylenically unsaturated aldehydes and/or carboxylic acids and an apparatus for preparing these substances using the regulating apparatus of the present invention.

Method and device for the two-step production of acrylic acid

A process for the continuous recovery of (meth)acrylic acid from the reaction gas of a catalytic gas-phase oxidation comprising the following process stages is proposed:

Method for the continuous extraction of (meth)acrylic acid

A process for the separation of (meth)acrylic acid from the reaction gas mixture formed in the catalytic gas phase oxidation by countercurrent absorption using a high-boiling inert hydrophobic organic liquid, in which the reaction gas mixture is passed through an absorption column countercurrently to the descending high-boiling inert hydrophobic organic liquid and (meth)acrylic acid is subsequently fractionally separated from the liquid effluent leaving the absorption column and containing (meth)acrylic acid, wherein a rectifying process is superimposed on the absorption process occurring naturally in the absorption column by removing a quantity of energy from the absorption column which exceeds its natural energy loss resulting from contact with the ambient atmosphere.

Separation of (meth)acrylic acid from the reaction gas mixture formed in

A process for the preparation of nicotinamide by amidation of a nicotinic acid/nicotinamide melt, vacuum distillation of the amidation mixture, removal of the nicotinamide as the bottom product and recycling of the top product, depleted with respect to nicotinamide, into the amidation stage together with addition of fresh amounts of nicotinic acid.

Preparation of nicotinamide

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Ellerstadt, Germany

Volker Diehl