Basf Aktiengesellschaft

Basf Se Corporation

Basfaktiengesellschaft

Bernd Eck

Dieter Baumann

Volker Schliephake

Klaus Joachim Mueller-Engel

Ulrich Hammon

Otto Machhammer

Joerg Heilek

Joachim Thiel

Theo Proll

Jörg Heilek

J&ouml;rg Heilek

Bernhard Maltry

Klaus Br&ouml;llos

Herbert Helfert

Martin Schmidt-Radde

Erik Bastiaensen

Johann-Peter Melder

Gerhard Nestler

Juergen Schroeder

Klaus Joachim Müller-Engel

Norbert Asprion

Hans Martan

Albrecht Dams

Ute Lichtfers

Armin Schraut

Klaus Joachim M&uuml;ller-Engel

Hans-J&uuml;rgen Weyer

Joachim-Thierry Anders

Iven Clausen

Ole Brettschneider

Emile De Decker

Michael-Dieter Ulbrich

Klaus Lehnert

Freidrich-Georg Martin

A description is given of an absorption medium for removing carbon dioxide from gas streams which comprises aqueous solution of an amine of the formula IHNR&#x2003;&#x2003;(I)where one or both radicals R are and the other radical R is hydrogen. The absorption medium is distinguished by particular oxidation resistance.

Absorption medium and method for removing carbon dioxide from gas streams

An apparatus for separating crystals from their suspension in contaminated crystal melt with purification, in which a hydraulic wash column has distributor aids in a distributor space.

Device for performing the purifying separation of crystals out of their suspension in a contaminated crystal melt

A process for purifying removal of crystals from their suspension in mother liquor by means of a washing column having forced transport in which the process chamber is encased by a metal wall which, on its side facing away from the process chamber, is heated at least along the length of the pure melt zone.

Method for performing the purifying separation of crystals out their suspension in a mother liquor

A thermal separating process for removing a stream containing enriched (meth)acrylic monomers from a mixture containing (meth)acrylic monomers, in which the liquid phases retained in the separating space at high temperature and high (meth)acrylic monomer content are minimized.

Thermal separating process for removing at least one stream containing enriched (meth) acrylic monomers

The present invention relates to the use of an optical line detector for regulating the position of the wash front and/or of the build-up front of the crystal bed of a wash column in a melt crystallization process and a corresponding regulation method. The line detector, for example a CCD camera or a linear array of reflection probes, is arranged in such a way that optical properties of the crystal bed can be detected continuously in a region running parallel to the longitudinal axis of the wash column, this region covering the desired setpoint position of the wash front or of the build-up front.

Regulation of a wash column in a melt crystallization process

The invention relates to a method for purifying a raw melt of at least one monomer by crystallization, wherein suspension crystallization is initially used and the resulting remaining melt or the suspension crystals that have been molten once again and separated are subjected to a mechanical separation operation before undergoing subsequent purification by crystallization.

Method of purifying a raw melt of at least one monomer by crystallization

Crude acrylic acid is purified batchwise by crystallization by a process which comprises at least one purification stage and at least one stripping stage and in which at least the first stripping stage is carried out in a different crystallizer from the first purification stage.

Method for discontinuous purification of crude acrylic acid by means of crystallization

The invention relates to a method for the production of a purified melt of a monomer melt obtained by condensation, absorption or extraction in a crystallizer, wherein the inlet to the crystallizer is subjected to a mechanical solid/liquid separation operation.

Method for the production of a purified melt of at least one monomer

In a process for the purification of a crude acrylic acid melt, the crude acrylic acid melt is converted, under the action of low temperatures, into a crude acrylic acid suspension consisting of acrylic acid crystals and residual melt, and the acrylic acid crystals of the crude acrylic acid suspension are freed from remaining residual melt in a wash column, the production of the acrylic acid crystals of the crude acrylic acid suspension being carried out in the presence of water, the wash column being a wash column with forced transport of the acrylic acid crystals and the wash liquid used being the melt of acrylic acid crystals purified in the wash column.

Method for the purification of a crude acrylic acid melt

Acrylic acid or methacrylic acid is purified by crystallization to obtain crystals and a mother liquor, by a process in which the crystals are washed with a wash liquid containing the acid and having a temperature from 15 to 40&#xb0; C. Furthermore, a process for the preparation of acrylic acid or methacrylic acid comprises the abovementioned purification process.

Process for the purification and preparation of acrylic acid or methacrylic acid

(Meth)acrylic acid is purified by crystallization by a process in which the (meth)acrylic acid is purified by a combination of at least two different dynamic crystallization processes, in particular a suspension crystallization and a layer crystallization.

Purification method for (meth)acrylic acid

The invention describes a process for the isolation of pure N-vinylpyrrolidone from N-vinylpyrrolidone-containing crude products, comprising a single-stage or multistage crystallization process, which comprises passing the mother liquor from the first crystallization stage either to a distillative and/or extractive purification, or returning it to an N-vinylpyrrolidone-containing product stream of the preparation process.

Method for obtaining pure n-vinyl pyrrolidone

Acrylic acid or methacrylic acid is purified be crystallization to obtain crystals and a mother liquor, by a process in which the crystals are washed with a was liquid containing the acid and having a temperature from 15 to 40&deg; C. Furthermore, a process for the preparation of acrylic acid or methacrylic acid comprises the abovementioned purification process.

Method of purifying and producing acrylic acid or methacrylic acid

A process for the fractional condensation of a gas mixture which, in addition to acrylic acid or methacrylic acid, also contains at least one further condensable component and additionally a high proportion of one or more noncondensable components, wherein the gas mixture is passed through a column having separatory internals and the condensable components are condensed by cooling.

Method for the fractional condensation of a hot gas mixture containing acrylic acid or methacrylic acid and having a high proportion of non-condensable constituents

Growing community of inventors

Viernheim, Germany

Bernd Eck