Sachtleben Chemie Gmbh

Zimmer Aktiengesellschaft

Venator Germany Gmbh

Elke Hirschberg

Bernd Proft

Ulrich Thiele

Wolf-Dieter Griebler

Jochen Winkler

Bernd Hirthe

Wolfgang Schmidt

Michael Wedler

Regina Optehostert

Sonja Weyand

Klaus Pipplies

Ulrich Gesenhues

Barbara Seling

A process is described for the production of a catalyst preparation, in which the catalyst containing at least one inorganic compound which is solid under standard conditions is comminuted by means of a dispersion unit into particles having a maximum average particle size dof 2 &#x3bc;m, preferably a maximum of 1 &#x3bc;m, implemented in accordance with DIN 66141 and DIN 66144, and is distributed at a concentration of from 1 to 50 wt. % (relative to the finished catalyst preparation) in a liquid.

Process for the production of a catalyst preparation and use of the catalyst preparation

The bodies are prepared either by pelleting of a pasty mixture of titanium dioxide powder and titanium dioxide sol and/or 1-20% nitric acid, followed by dehydration and calcination at a temperature of between 400 and 1000&deg; C. for between 0.5 and 3.5 hours; or by preparing pellets from the titanium dioxide powder and added water, annealing of the pellets at between 300 and 500&deg; C., saturation of same with titanium dioxide sol or 1-20% nitric acid in a vacuum, followed by drying and finally annealing at a temperature of between 400 and 1000&deg; C. for between 0.5 and 3 hours.

Titanium dioxide methods of production

The present invention comprises a new catalyst for the production of polyesters consisting essentially of a finely dispersed, large surface area titanium compound selected from hydrated TiO.sub.2 obtained by hydrolysis and having the composition yTiO.sub.2.zH.sub.2 O and from titanates having the composition (Me.sub.n O).sub.x.(TiO.sub.2).sub.y.(H.sub.2 O).sub.z, wherein Me is an alkaline earth metal or alkali metal. In addition, the present method comprises a process for the production of polyesters using this catalyst as an esterification or transesterification catalyst and as a polycondensation catalyst, whereby a phosphorous-oxygen-compound is added immediately before, during, or after the polycondensation.

Titanium-containing catalyst and process for the production of polyester

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Moers, Germany

Elke Hirschberg