Basf Se Corporation

Catharina Horstmann

Klaus Joachim Mueller-Engel

Frank Rosowski

Andreas Raichle

Holger Borchert

Ulrich Cremer

Josef Macht

Claus Hechler

Klaus Joachim Müller-Engel

Martin Dieterle

Jochen Petzoldt

Wilhelm Ruppel

Jens Scheidel

Gerhard Cox

Bernd Schall

Götz-Peter Schindler

Cornelia Katharina Dobner

Christoph Adami

Gregor Grackiewicz

Andrey Karpov

Stefan Altwasser

Michael Krämer

Annebart Engbert Wentink

Karl-Heinrich Klappert

Yan Li

Hans-Jürgen Bassler

A process for continuously preparing the tert-butyl ester of an ethylenically unsaturated carboxylic acid, by a) reacting an ethylenically unsaturated carboxylic acid with isobutene in the presence of an acidic catalyst to give an esterification mixture; b) removing the acidic catalyst; c) removing low-boiling components; and d) supplying a tert-butyl ester-comprising liquid to a distillation apparatus and subjecting it to purifying distillation in the distillation apparatus, where d1) in the distillation apparatus the tert-butyl ester-comprising liquid is separated into a tert-butyl ester-comprising gaseous top product and a carboxylic acid-comprising liquid bottom product; d2) the tert-butyl ester-comprising gaseous top product is at least partly condensed and the condensate is recycled partly as reflux to the distillation apparatus; d3) the carboxylic acid-comprising liquid bottom product is recycled at least partly to step a); d4) carboxylic acid-comprising liquid bottom product is drawn off and passed to a heater; a superheated, liquid recycle stream is taken from the heater; and the superheated recycle stream is let down into the distillation apparatus; and d5) at least in the top region of the distillation apparatus, the distillation apparatus walls in contact with the vapor, at least in sub-regions, are heated and/or thermally insulated. In the course of the process, the separation of the tert-butyl ester from unreacted carboxylic acid is carried on with a particularly low level of accompanying polymerization both of the tert-butyl ester and of the carboxylic acid.

Production of tert-butyl esters of ethylenically unsaturated carboxylic acids

A process for continuously preparing the tert-butyl ester of an aliphatic C-Ccarboxylic acid comprises: a) the reaction of an aliphatic C-Ccarboxylic acid with isobutene in the presence of an acidic catalyst to give an esterification mixture (G); b) the partial evaporation of the esterification mixture (G), giving a liquid first high boiler phase (SPh) comprising the acidic catalyst, and a first vapor (B) comprising tert-butyl ester; c) the fractional condensation of the first vapor (B) by partially condensing the first vapor (B) at a first pressure and a first temperature and obtaining a first condensate (K), partially condensing the uncondensed second vapor (B) at a second pressure and a second temperature and obtaining a second condensate (K), the first temperature being 0 to 45&#xb0; C. below the condensation temperature of the tert-butyl ester at the first pressure and the second temperature being 45 to 80&#xb0; C. below the condensation temperature of the tert-butyl ester at the second pressure, with the proviso that the second temperature is at least 5&#xb0; C. below the first temperature; and d) the combination of the first condensate (K) and the second condensate (K) and the feeding to a combined workup, and recycling of the third vapor (B) not condensed at the second temperature into step a). The process allows the preparation of the tert-butyl ester of an aliphatic C-Ccarboxylic acid by reaction of the carboxylic acid with isobutene, with isolation of unconverted isobutene from the esterification mixture in an energetically favorable manner and with an improved degree of removal.

Preparation of tert-butyl esters of aliphatic carboxylic acids

An eggshell catalyst consisting of a hollow cylindrical support body of length 2 to 10 mm, external diameter 4 to 10 mm and wall thickness 1 to 4 mm, and an eggshell, applied to the outer surface of the support body, of catalytically active oxide material of the general formula I,MoVWCuXXO&#x2003;&#x2003;(I)in which the variables are each defined as follows:

Eggshell catalyst consisting of a hollow cylindrical support body and a catalytically active oxide material applied to the outer surface of the support body

A process for producing geometric shaped catalyst bodies K whose active material is a multielement oxide of stoichiometry[BiWO][MoZZFeZZZO],in which a finely divided oxide BiWOwith the particle size dand, formed from element sources, a finely divided intimate mixture of stoichiometry MoZZFeZZZwith the particle size dare mixed in a ratio of a:1, this mixture is used to form shaped bodies and these are treated thermally, where (d)&#xb7;(d)&#xb7;(a)&#x2267;820. A shaped catalyst body obtained by the process. A catalyst obtained by grinding the shaped catalyst body. A process for heterogeneously catalyzing the partial gas phase oxidation of an alkane, alkanol, alkanal and/or an alkenal of 3 to 6 carbon atoms using the catalyst.

Process for producing geometric shaped catalyst bodies

A process for producing geometric shaped catalyst bodies K whose active material is a multielement oxide of stoichiometry[BiWO][MoZZFeZZZO],in which a finely divided oxide BiWOwith the particle size dand, formed from element sources, a finely divided intimate mixture of stoichiometry MoZZFeZZZwith the particle size dare mixed in a ratio of a:1, this mixture is used to form shaped bodies and these are treated thermally, where (d)&#xb7;(d)&#xb7;(a)&#x2267;820.

A process for preparing C-C-oxygenates from a reactant stream A which comprises essentially a C-C-alkane or a mixture of C-C-alkanes, by

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A process for producing geometric shaped catalyst bodies K whose active material is a multielement oxide which comprises the element Mo, the elements Bi and/or V and one or more of the elements Co, Ni, Fe, Cu and alkali metals, in which sources of the different elements are used to obtain a finely divided mixture which is coarsened to a powder by press agglomeration, the coarsened powder is used to form, by press agglomeration, shaped bodies V which are separated into undamaged shaped bodies Vand into damaged shaped bodies V, the undamaged shaped bodies Vare converted by thermal treatment to the shaped catalyst bodies K, and the damaged shaped bodies Vare comminuted and recycled into the obtaining of the finely divided mixture.

Process for continuously producing geometric shaped catalyst bodies K

A process for producing geometric shaped catalyst bodies K whose active material is a multielement oxide of stoichiometry[BiZO][BiMoFeZZZZZO],

A process for regenerating a catalyst bed deactivated in the course of a heterogeneously catalyzed partial dehydrogenation of a hydrocarbon, in which a gas comprising molecular oxygen is conducted at elevated temperature through the deactivated catalyst bed and, in the course of the regeneration, the content of molecular oxygen in the regeneration gas is increased repeatedly and the increase in the carbon oxide content of the regeneration gas as it flows through the deactivated catalyst bed is restricted to values of &#x2266;5% by volume.

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Ludwigshafen, Germany

Catharina Horstmann