Basf Aktiengesellschaft

Basf Se Corporation

Dieter Baumann

Bernd Eck

Joerg Heilek

Ulrich Hammon

Klaus Joachim Mueller-Engel

Joaquim Henrique Teles

Jörg Heilek

Johann-Peter Melder

Volker Schliephake

Matthias Rauls

Beatrice Roessler

Peter Bassler

Rolf-Hartmuth Fischer

Eberhard Fuchs

Klaus Joachim Müller-Engel

Frank Ohlbach

Heinz Hannebaum

Hermann P&uuml;tter

Hermann Ascherl

Beatrice Röβler-Feigel

Birgit Potthoff-Karl

Jürgen Schröder

Heinz-Josef Kneuper

Hermann Pütter

Bernhard Maltry

Holger Friedrich

Matthias Maase

Joachim Thiel

Michael Schönherr

Thomas Genger

Hermann Wistuba

Bernhard Otto

Thomas Letzelter

Dieter Schlafer

J&ouml;rg Heilek

Hans-J&uuml;rgen Weyer

Sebastian Wloch

Andreas Glass

Gerhard Bertlein

Emile De Decker

Beatrice Rössler

Robert Sengpiel

Michael Mauss

Marcus Bechtel

Erik Bastiaensen

Beatrice Rössler-Feigel

Jan-Martin Loening

Jan-Martin Löning

Karl Heinz Schall

Sascha Müller

Linda Garella

Sacha MÜLLER

Jörg Torsten Nickel

Harald Joost

Thomas-Michael Scholbrock

Bernd Menning

Martina Holzbecher

Beatrice Rößler-Feigel

The present invention relates to a method for obtaining crystalline L-alanine from an aqueous solution of L-alanine, in particular from an aqueous solution of L-alanine, which is obtained from a fermentation process.

Method for obtaining crystalline L-alanine

The invention relates to a tray for a mass transfer column, having gas passage openings distributed over the tray (), and having at least one baffle () for flow diversion of liquid flowing on the tray, it being possible for the tray () to be fed with a liquid via at least one entry (). The tray has at least one entry (), at least one separating weir (), which separates the inflowing liquid into two streams, and at least two exits (), or has at least two entries () and at least one exit () for the liquid, each stream flowing along a flow path () to an exit (). The invention further relates to a mass transfer column comprising the tray, and to a use of tray and mass transfer column.

Base for a mass transfer column

The present invention relates to a process for purifying a gas mixture comprising dinitrogen monoxide, at least comprising the treatment of a gas mixture G-0 comprising dinitrogen monoxide to obtain a gas mixture G-A, at least comprising the absorption of the gas mixture G-0 in a solvent mixture S-I to obtain an offgas stream and a composition C-A, and the desorption of a gas mixture G-1 from the composition C-A to obtain a solvent mixture S-I', subsequent condensation of the gas mixture G-A to obtain a liquid composition C-1 comprising dinitrogen monoxide and a gaseous mixture G-K, wherein the gaseous mixture G-K is recycled into the process.

Process for purifying N2O

The present invention relates to a process for purifying a gas mixture G-0 comprising dinitrogen monoxide, at least comprising the contacting of the gas mixture G-0 with a solvent mixture (I) at least comprising 50% by weight of water based on the overall solvent mixture (I), the pH of the solvent mixture (I) being in the range from 3.5 to 8.0, the desorption of a gas mixture G-1 from a composition (A), the contacting of the gas mixture G-1 with a solvent mixture (II) at least comprising 50% by weight of water based on the overall solvent mixture (II), the pH of the solvent mixture (II) being in the range from 2.0 to 8.0, and the desorption of a gas mixture G-2 from a composition (B), the pH being based in each case on a measurement with a glass electrode, and to the use of gas mixtures obtainable by a process according to the invention as oxidizing agents for olefins.

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The present invention relates to a process for purifying a gas mixture comprising dinitrogen monoxide, at least comprising the at least partial condensation of a gas mixture G-I comprising dinitrogen monoxide to obtain a liquid composition C-1 comprising dinitrogen monoxide, and the contacting of the composition C-1 with a gas mixture M-1 to obtain a composition C-2 and a gas mixture M-2.

Process for purifying dinitrogen monoxide

A process for purifying removal of acrylic acid, methacrylic acid, N-vinylpyrrolidone or p-xylene crystals from their suspension in mother liquor by means of a wash column with forced transport, whose shell of the process chamber is a metal wall, the wash column additionally being enveloped by a thermal insulation material having a water vapor barrier and a specific heat flow of &#x3e;0.1 W/mand &#x3c;10 W/mflowing into the process chamber through the metal wall of the wash column.

Process for purifying removal of acrylic acid, methacrylic acid N-vinylpyrrolidone or P-xylene crystals from their suspension in mother liquor

The present invention relates to a process for the preparation of solid acylphosphine oxides by converting an acylphosphine oxide which is in the form of a melt or in dispersed form into the solid state of aggregation with mechanical stress, shearing/internal agitation of the melt.

Method for producing acylphosphine oxide solids

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

The present invention relates to a process for purifying a gas mixture G-0 comprising dinitrogen monoxide, at least comprising the absorption of the gas mixture G-0 in an organic solvent, subsequent desorption of a gas mixture G-1 from the laden organic solvent, absorption of the gas mixture G-1 in water and subsequent desorption of a gas mixture G-2 from the laden water, and also to the use of a purified gas mixture which comprises dinitrogen monoxide and is obtainable by such a process as an oxidizing agent for olefins.

A process for continuously removing a target product X in the form of fine crystals from a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in an indirect heat transferer, in which the crystal suspension formed is conducted out of the heat transferer first into a mixed buffer tank and, from there, fed to an apparatus for separating the crystal suspension into crystals and liquid phase, and wherein external measures dissipade the oversaturation of the crystal suspension fed to the buffer vessel with target product X.

Process for operating a continuous removal of a target product X in the form of fine crystals

The present invention relates to a process for purifying a gas mixture comprising dinitrogen monoxide and to the use of a gas mixture purified in this way as an oxidant for olefins. In a further embodiment, the present invention also relates to a process for preparing ketones comprising the oxidation of an olefin with a gas mixture which has been purified in accordance with the invention and comprises dinitrogen monoxide.

Method for purifying and concentrating dinitrogen monoxide

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

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

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Speyer, Germany

Dieter Baumann