Evonik Degussa Gmbh

Degussa Aktiengesellschaft

Evonik Operations Gmbh

Degussa Gmbh

Christian Panz

Hartwig Rauleder

Guido Stochniol

Karl Meier

Mario Scholz

Michael Kempf

Helga Obladen

Ralf Schmoll

Markus Ruf

Roland Bergmann

Wolfgang Lortz

Ryo Takata

Rene Allerdisse

Uwe Schachtely

Dieter Kuhn

Bodo Frings

Mario Loebbus

Ulrich Brinkmann

Florian Paulat

Anja Lukas

Doris Misselich

Jurgen Behnisch

Sven Muller

Georg Markowz

Mustafa Siray

Frank Menzel

Jürgen Glenneberg

Christian Goetz

Jürgen Erwin Lang

Ulrich Fischer

Rüdiger Schütte

Daniel Esken

Thomas Barthel

Franz Schmidt

Christian Götz

Gabriele Bergmann

Matthew Romaine

Guido Titz

James Toth

Matt Romaine

Jürgen Behnisch

Peter Erlhöfer

Jens Peltzer

Claudia Fuhrmann

Dieter Oehm

Ralf Stoffels

Kenichi Kawamoto

Marcel Herzog

Johannes Kamp

Eduardo Federico Arévalo Saade

Hari Prasad Mangalapally

Nils Henning Seidel

Aziz El Moussaoui

Sven Müller

Peter Erlhofer

René Allerdisse

James J Toth

In a cyclic anthraquinone process for producing hydrogen peroxide, which comprises a distillation unit with vapor compression for concentrating hydrogen peroxide, aqueous condensate from the distillation unit is passed over a bed of a cation exchange resin in its protonated from to provide a purified condensate, and the purified condensate is used as extractant for extracting hydrogen peroxide in the anthraquinone process, as column reflux for the distillation unit or as a diluent for diluting an aqueous hydrogen peroxide solution.

Device and process for producing hydrogen peroxide by an anthraquinone process

Dispersion comprising particles of a surface-modified, hydrophilic silica,

SiO2 containing dispersion with high salt stability

The present invention relates to a method of purifying strong acids or strongly acidic media to remove di- and higher valent metal ions, which can be used within the context of the production of high-purity silica. The invention further relates to the use of special ion exchangers for carrying out the method according to the invention and the resultant high-purity silicas.

Method for the separation of metal ions that are divalent or higher from strong acids or highly acidic media

The present invention relates to a process for preparing aqueous colloidal silica sols of high purity from silicate solutions, to aqueous colloidal silica sols with a specific profile of impurities, and to the use thereof. The invention further encompasses high-purity aqueous silica obtained as an intermediate in the course of the purification process, high-purity silicon dioxide obtainable by dewatering, and the use thereof.

Process for preparing aqueous colloidal silica sols of high purity from alkali metal silicate solutions

A precipitated silica having an SiOHabsorbance ratio of greater than or equal to 1.5, a silanol group density of 1 to 3.0 SiOH/nm, a modified tapped density of 1 to 50 g/l, and a pH of 3-5, when measured as a aqueous suspension of 5.00 g of the precipitated silica in 100 ml. of deionized water allows preparation of storage-stable RTV-1 silicone rubber formulations without stabilizer. A process for preparing the precipitated silica and its use in thickening sealants is provided.

Precipitated silicas for storage-stable RTV-1 silicone rubber formulations without stabilizer

Hydrophilic precipitated silicas which combine a particularly low initial moisture content with low moisture absorption over time, a low tapped density and a low silanol group density, have the following physicochemical parameters: equilibrium moisture content (at 70% relative humidity/20&#xb0; C.) of 0.5%-5.0% by weight, based on the weight of the hydrophilic precipitated silica, BET surface area of 50-250 m/g, CTAB surface area of 50-250 m/g, and DBP (anhydrous) of 200-350 g/100 g.

Hydrophilic silica for sealants

A hydrophobic precipitated silica having a BET of less than 110 m/g, a CTAB of less than 150 m/g, a BET/CTAB ratio of less than 3, a carbon content of greater than 3.1%, a pH of 9.7 to 10.5, a DBP of less than 230 g/(100 g), and a methanol wettability of more than 50%. The hydrophobic precipitated silica is used in compositions including defoamers, silicone rubber and HTV crosslinkable silicone rubber compositions. The hydrophobic precipitated silica is also useful as a flow assistant and carrier or anti-blocking agent.

Hydrophobic precipitated silica for defoamer formulations

A thermal insulation material comprising a precipitated silica having a modified tapped density of less than or equal to 70 g/l.

Thermal insulation material comprising precipitated silica

A process for milling amorphous solids using a milling apparatus can result in particles having a median particle diameter dof &#x3c;1.5 &#x3bc;m. The process includes: operating a mill in a milling phase with an operating medium selected from the group consisting of gas, vapor, steam, a gas containing steam and mixtures thereof, and heating a milling chamber in a heat-up phase before the actual operation with the operating medium in such a way that a temperature in the milling chamber, the mill exit or both, is higher than a dew point of the operating medium.

Amorphous submicron particles

Precipitated silicas with a high pH and their use in applications as defoamers having optimum silanol group density and a process for preparing precipitated silicas and to their use, particularly in defoamer formulations.

Hydrophilic precipitated silica for defoamer formulations

A precipitated silica having a d-value of from 150 to 2000 nm, a d-value of from 500 to 7000 nm, a silanol group density of from 2.5 to 8 OH/nm, and a modified tapped density of less than or equal to 70 g/l is useful for thickening and providing thixotropy in liquid systems and shows superior efficiency at thickening and creating thixotropy compared to existing grades of precipitated silica. The precipitated silica functions best as a thixotrope in non-polar or intermediate polar liquid systems such as unsaturated polyester (UPE) resin systems.

Precipitated silica for thickening and creating thixotropic behavior in liquid systems

Precipitated silicas having an SiOHabsorbance ratio of greater than or equal to 1, may be used as reinforcers and thickeners for sealants.

Precipitated silicas having special surface properties

The invention relates to hydrophobicized precipitated silicas that possess an extremely high whiteness and extremely low moisture absorption. The hydrophobic precipitated silicas are prepared, inter alia, by coating with silicone oil and oxidative heat treatment.

High-whiteness hydrophobic precipitated silica with ultralow moisture absorption

A hydrophobic precipitated silica is prepared by a process comprising:

Process for preparing high-whiteness hydrophobic precipitated silica with ultralow moisture absorption

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Wesseling-Berzdorf, Germany

Christian Panz