Evonik Degussa Gmbh

Evonik Operations Gmbh

Degussa Gmbh

Orion Engineered Carbons Gmbh

Helmut Roth

Kai Schumacher

Rainer Golchert

Harald Alff

Christian Schulze Isfort

Helmut Mangold

Mario Scholz

Alfons Karl

Andreas Hille

Matthias Rochnia

Roland Schilling

Udo Wieschnowsky

Burkhard Freund

A process for production of silica having variable thickening wherein

Method for producing silicic acid with variable thickening

Process for production of silica having variable thickening wherein

Process for the production of doped metal oxide particles, wherein the doping component is present on the surface in the form of domains, wherein in a first reaction zone, an oxidizable and/or &#x2014;hydrolysable metal compound as dopant together with an atomization gas is atomized into a flow of metal oxide particles in a carrier gas, wherein the mass flow of the metal oxide particles und &#x2014;the mass flow of the dopant are selected such that the doped metal oxide particles contain 10 ppm to 10 wt. % of the doping component, where the quantity of dopant to be introduced is calculated as the corresponding oxide, and wherein the temperature in the first reaction zone is &#x2014;selected such that it is below the boiling temperature of the dopant under the prevailing reaction conditions, and then, in a second reaction zone, the flow from the first &#x2014;reaction zone and optionally at least as much oxygen and/or steam are &#x2014;introduced that the quantity of oxygen and/or steam at least suffices completely to convert the dopant, wherein the temperature is from 300 to 2000&#xb0; C., &#x2014;preferably 500 to 1000&#xb0; C., and the reaction mixture is then cooled or allowed to cool and the doped metal oxide particles are separated from the gaseous substances.

Process for the production of doped metal oxide particles

Alkali metal oxide-metal oxide mixed oxide powder in the form of aggregates of pore-free primary particles, comprising from 0.005 to 5% by weight of at least one alkali metal oxide, which has a BET surface area of from 100 to 350 m/g, has a specific DBP number, expressed as DBP number per square meter of specific surface area, greater than or equal to that of a powder which has only the metal oxide component, has the alkali metal oxide distributed in the core and on the surface of the primary particles. Silicone rubber comprising the alkali metal oxide-metal oxide mixed oxide powder.

Mixed oxide powder comprising alkali metal oxide, and silicone rubber comprising this powder

Titanium-aluminium mixed oxide powder with a proportion of aluminium oxide of less than 1 wt. % or a proportion of titanium dioxide of less than 5 wt. %, wherein the sum of the proportions of titanium dioxide and aluminium oxide is at least 99.7 wt. %. It is produced by transferring a vaporous starting compound of the quantitatively greater component of the mixed oxide into a mixing chamber by means of primary air and a vaporous starting compound of the quantitatively smaller component of the mixed oxide by means of an inert gas, and burning the mixture mixed with hydrogen in a mixing chamber into a reaction chamber. It can be used as a catalyst support.

Titanium-aluminium mixed oxide powder

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Mainaschaff, Germany

Helmut Roth