Condea Chemie Gmbh

Sasol Germany Gmbh

Rwe-dea Aktiengesellschaft Fur Mineraloel Und Chemie

Vacuumschmelze Gmbh

Rwe-dea Aktiengesellschaft Fuer Mineraloel Und Chemie

Sasol Germany Gmb

Arnold Meyer

Klaus F Noweck

Ansgar Reichenauer

Jens Juhl

Andrea Brasch

Klaus Diblitz

Jurgen Schimanski

Frank Michael Bohnen

Martin Wassermann

Bernhard Fischer

Bernhard Roas

Stefan Kautz

Erich Scherf

Albert Thomas Herrmann

Reiner Glöckler

Anders Svensson

Reiner Gl&ouml;ckler

Helmut Helld&ouml;rfer

Jens M&uuml;ller

J&uuml;rgen Schimanski

Rainer Gloeckler

Jan L Schiefler

Jürgen Schimanski

Ernst Tonsen

This invention relates to crystalline boehmitic aluminas the crystallites of which exhibit unusual dimensional differences in the space directions 020 and 120. This invention further relates to a method for preparing such aluminas and the follow-up products obtained therefrom by calcination.

Boehmitic aluminas and high-temperature stable, high-porosity, pure-phase aluminium oxides obtained therefrom

The invention relates to a procedure for manufacturing alumina hydrates by precipitating aluminum salts in the presence of crystal nuclei of a specific size.

Method of producing aluminum hydroxides by precipitating aluminum salts in the presence of seed crystals

Process for the manufacture of high-purity alumino-silicates which are dispersible in aqueous and/or aqueous-acidic media by hydrolysis of aluminum compounds and organosilicon compounds.

Process for the manufacture of dispersible alumino-silicates

Boehmitic aluminas, and high-temperature stabile and highly porous aluminum oxides in a pure phase which are obtained therefrom

Coatings especially for superconductive strip conductors, as well as methods of applying the coatings, are addressed. Exemplary coatings include aluminum oxide in an aqueous suspension, with aluminum oxide particles contained in the suspension having size typically between 0.5-10 &mgr;m.

Coating method for use in a process for producing high-temperature superconductive strip conductors

Paint detackifiers and/or sedimentation agents are provided which contain amorphous alumina and/or alumina in pseudoboehmite or boehmite form having an average crystallite size of from 0.1 to 15 nm and/or the hydrates and hydroxyalkylpolysaccharides thereof.

Agents for unsticking paint, and sedimentation agents

The present invention relates to a process for the manufacture of high-purity alumino-silicates which are dispersible in aqueous and/or aqueous-acidic media by hydrolysis of aluminium compounds and silicic acid compounds and hydrothermal treatment.

Process for producing water-dispersible alumina hydrates having a

A process for the continuous production of monocarboxylic acids from the corresponding alcohols by alkali fusion wherein the oxidation is continuously accomplished in an extrusion reactor without addition of diluents and the alkali salts of the monocarboxylic acids are discharged from the reactor as a solid product and are directly neutralised with mineral acids. High-purity monocarboxylic acids are obtained after phase separation.

Process for the continuous production of monocarboxylic acids

A process for the preparation of boehmitic alumina compounds having a purity of, at least, 99.95% Al.sub.2 O.sub.3. The compounds produced according to the invention have a pore radii in the range of 3 to 100 nm. The preparation of such compounds is carried out by, first, obtaining an alumina suspension from a neutral aluminum alkoxide hydrolysis and, then, aging the alumina suspension in an autoclave, preferably, at a steam pressure of 1 to 30 bar, corresponding to a temperature of 100.degree. C. to 235.degree. C., for between 0.5 and 20 hours. The aging step of the invention is preferably carried out with stirring at a peripheral speed of 1 to 6 m/s.

Process for the production of boehmitic aluminas

The invention relates to a process for the preparation of a high-purity, thermally stable catalyst carrier based on aluminosilicate with 0.5 to 50% by weight SiO.sub.2 by mixing an aluminum compound with a silicic acid compound in an aqueous medium, and subsequently drying or calcining the product obtained. The aluminum component used is a C.sub.2 to C.sub.20+ aluminum alkoxide hydrolyzed with water and purified by means of ion exchangers. Simultaneously or subsequently orthosilicic acid purified by means of ion exchangers is added to the aluminum compound.

Process for the preparation of a catalyst carrier based on

A composition for use as a paint detackifying and sedimentation agent is disclosed, which includes 60 to 80% by weight of alumina Al.sub.2 O.sub.3) in pseudoboehmite or boehmite form, either in X-ray amorphous form or with a crystallite size of 20 to 150 A. The composition of the invention may include foam inhibitors, or other conventional additives. A process for use of the composition of the invention is also disclosed in which the composition is added as a 5-30% aqueous dispersion or in dry form to the circulating water of a paint spraying booth and used in a quantity of 1 to 10% by weight, based on 1 kg of the paint to be detackified.

Process for paint detackifying and sedimentation

For the preparation of spheroidal alumina, an alumina sol having a solids content of more than 20 to 40% by weight of alumina is prepared from alumina hydrate, which consists of boehmite/pseudo-boehmite, by thorough stirring in aqueous dilute acid, and the alumina sol is caused in the presence of 1 to 10% by weight of urea to drop into a forming column whose top portion is filled with a liquid hydrocarbon and whose bottom portion is filled with an aqueous solution of ammonia and which is held at room temperature, and the thus formed spheroidal particles are dried and activated. The resultant spheroidal particles may also be subjected to a per se known aging treatment.

Method for preparing spheroidal alumina

A highly porous alumina having a large surface area and a low bulk density is prepared by hydrolyzing an aluminum alcoholate at a temperature of 40.degree. to 90.degree. C. in an aqueous solution containing 8 to 30% by weight of a compound which upon drying or activating splits out NH.sub.3 and/or CO.sub.2, there being used 0.5 to 3 parts by weight of the compound per 10 parts of aluminum alcoholate. The aluminum oxyhydrate paste formed by the hydrolysis is separated from the alcohol phase, in a given case is also purified, and subsequently dried or activated.

Method for manufacturing a high porous alumina having a large surface

Formed products are made from aqueous aluminum oxyhydrate by peptizing the aqueous aluminum oxyhydrate with an acid and then subsequently adding a dilute solution of ammonia or an ammonia yielding compound following by extrusion, drying and calcining.

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St. Michaelisdonn, Germany

Arnold Meyer