Basf Aktiengesellschaft

Basf Se Corporation

Peter Schlemmer

Ulrich Hammon

Klaus Joachim Müller-Engel

Volker Schliephake

Claus Hechler

Jörg Heilek

Volker Diehl

Ulrich Rauh

Jochen Kessler

Ulrich Nieken

Jobst Rüdiger Von Watzdorf

Hubertus Kröner

Wolfgang Kasten

Thomas Hauff

Jochen Keβler

Christina Benthack

Thomas Buschulte

Bernd Hagen

Volker Huth

Axel Schroth

Jochen Meschke

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 the secondary chamber, into which the liquid phase P flows continuously, of an indirect heat exchanger with simultaneous continuous flow of a coolant through the primary chamber of the indirect heat exchanger and continuous withdrawal of a crystal suspension S having a degree of crystallization Y from the secondary chamber, in which the degree of crystallization Y is adjusted on the basis of a heat balance conducted continuously with the aid of a process computer.

Process for continuously removing a target product X in the form of fine crystals

The invention relates to a method for monitoring exothermic reactions in a reactor, in which one or more starting materials react exothermically to give at least one product, and at least one gas is present in the reactor during operation as intended or during a runaway, comprising the following process:

Method for monitoring and ensuring the safety of exothermic reactions

A method for the safe operation of a continuously operated heterogeneously catalyzed gas-phase partial oxidation of an organic compound in a reactor, the composition of the feed gas mixture being controlled by pressure-controlled concentration determination of relevant constituents.

Method for the safe operation of a gas-phase partial oxidation

&#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 continuously operated heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound in an oxidation reactor is operated safely by a process in which an explosion diagram for the feed gas mixture is deposited as the basis of a cut-out mechanism in a computer.

Safe operation of a continuous heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound

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Eisenberg, Germany

Peter Schlemmer