Basf Aktiengesellschaft

Basf Se Corporation

Raimund Felder

Signe Unverricht

Heiko Arnold

Klaus Harth

Jochen Petzoldt

Ulrich Hammon

Klaus Joachim Mueller-Engel

Martin Dieterle

Christian Walsdorff

Klaus Joachim Müller-Engel

Mark Duda

Sebastian Storck

Hans-Peter Neumann

Jens Weiguny

Otto Hofstadt

Ruprecht Meissner

Silke Berndt

Cornelia Dobner

Wolfgang Juergen Poepel

Wolfgang Jürgen PÖPEL

In a process for the thermal treatment of the precursor material of a catalytically active material in a rotary tube furnace through which a gas stream flows, at least a proportion of the gas stream flowing through the rotary tube furnace is circulated, and the associated rotary tube furnace apparatus and tube-bundle reactors for the partial gas-phase oxidation of acrolein to acrylic acid are loaded with catalysts whose catalytically active material is obtainable by the process for the thermal treatment.

Thermal treatment of the precursor material of a catalytically active material

The invention relates to a method for the heterogenically catalyed gas-phase partial oxidation of precursor compounds of (meth)acrylic acid in a fixed catalyst bed, containing as the catalyst an activated mass of mixed oxide, shaped to form a geometric body. Said geometric body is a geometric base body, into whose surface a cavity is incorporated.

Heterogenically catalysed gas-phase partial oxidation method for precursor compounds of (meth)acrylic acid

Disclosed is a method for producing a catalyst containing vanadium, phosphorus, and oxygen, which is used for oxidizing the gas phase of a hydrocarbon having at least four carbon atoms to maleic anhydride. According to the inventive method, a corresponding catalyst precursor which contains vanadium, phosphorus, and oxygen and is provided with particles having an average diameter of at least 2 mm is converted into a catalytically active form by means of calcination, and a flow of the catalyst precursor is transported on a conveyor belt across at least one calcination area over a distanceat an essentially steady speed in order to be calcinated. The variation over time of the gas temperature in relation to the set point value amounts to &#x2266;5&#xb0; C. at each position in the area of the flow of the catalyst precursor, which lies within the second half/2 of the calcination area, while the local difference in the gas temperature between any positions in the area of the flow of the catalyst precursor, which is located within the second half/2 of the calcination area, amounts to &#x2266;5&#xb0; C.

Method for the production of a catalyst containing vanadium, phosphorus, and oxygen

A catalyst suitable for the gas-phase oxidation of organic compounds to &#x3b1;,&#x3b2;-unsaturated aldehydes and/or carboxylic acids and having an active phase comprising a multimetal oxide material is prepared by a process in which a particulate catalyst precursor which contains oxides and/or compounds of the elements other than oxygen which constitute the multimetal oxide material, which compounds can be converted into oxides, is prepared and said catalyst precursor is converted by calcination into a catalytically active form, wherein a stream of the particulate catalyst precursor is passed at substantially constant speed through at least one calcination zone at constant temperature for calcination.

Method for producing a multi metal oxide catalyst, method for producing unsaturated aldehydes and/or carboxylic acids and band calcination device

In a process for preparing a multiplephase multimetal oxide composition comprising Mo, V, Cu and, if desired, further elements, at least one phase is preformed separately and dispersed in a plastically deformable precursor composition of a further phase. The mixture is dried and calcined. The multimetal oxide composition is suitable as active composition of catalysts for the catalytically oxidation of organic compounds in the gas phase, in particular for the oxidation of acrolein to acrylic acid.

Method for producing multiple-phase multi-metal oxide materials

Shaped catalysts for heterogeneously catalyzed reactions are in the form of hollow cylinders or annular tablets whose end faces are rounded both to the outer edge and to the edge of the central hole, i.e. have no right-angled edges.

Shaped catalysts

Multimetal oxide material for gas-phase catalytic oxidation of organic compounds

Growing community of inventors

Neustadt, Germany

Raimund Felder