Thomas Tacke

US Patent:

6432869, Aug 13, 2002

Filed:

Sep 22, 1999

Appl. No.:

09/401498

Inventors:

Helmfried Krause - Rodenbach, DE
Hermanus Gerhardus Josef Lansink Rotgerink - Mömbris-Mensengesäss, DE
Thomas Tacke - Paducah KY
Helmut Mangold - Rodenbach, DE
Heike Riedemann - Mömbris, DE
Manfred Fuchs - Alzenau, DE

Assignee:

Degussa AG - Düsseldorf

International Classification:

B01J 2108

US Classification:

502239, 502232, 502235, 502236, 502238, 502242, 502349, 502350, 502351, 502355, 106436, 106438, 106442, 106450, 106481, 106483, 568896, 568898, 264239

Abstract:

Moldings are disclosed for use as a catalyst or catalyst support for hydrating olefin, such as ethylene and propylene. The moldings are based on a pyrogenically produced mixed oxide having the following physicochemical parameters: The moldings are produced by homogenizing pyrogenically produced mixed oxide as desired with water and one or more compounds selected from the group of methylcellulose, methylhydroxyethylcellulose, wax, polyethylene glycol, magnesium stearate or aluminium stearate; drying the product at a temperature of 70-150Â C. ; optionally comminuting to yield a powder; optionally compression molding the powder to yield moldings; and performing heat treatment for a period of 0. 5 to 10 hours at a temperature of 400 to 1200Â C. Prior to drying, the mixture may also be subjected to kneading and/or shaping processes and extruded.

US Patent:

6593270, Jul 15, 2003

Filed:

Nov 6, 1998

Appl. No.:

09/187420

Inventors:

Helmfried Krause - Rodenbach, DE
Hermanus Lansink Rotgerink - Glattbach, DE
Oliver Feuer - Nidderau, DE
Thomas Tacke - Paducah KY
Peter Panster - Rodenbach, DE

Assignee:

Degussa AG - Dusseldorf

International Classification:

B01J 2344

US Classification:

502328, 502330, 502339, 423335

Abstract:

Moldings based on pyrogenic silicon dioxide with a pore volume of 0. 5 to 1. 8 ml/g are prepared by homogenizing pyrogenic silicon dioxide with methylhydroxyethyl cellulose, wax and polyethylene glycol with the addition of water, subjecting this mixture to a compounding and shaping process, extruding, optionally cutting the extrudate to the desired length using a cutting device, drying at a temperature of 70Â to 150Â C. and conditioning for a period of 30 minutes to 10 hours at a temperature of 400Â to 1200Â C. The moldings may be used as catalysts or catalyst supports for the preparation of vinyl acetate monomer, the hydration of ethylene and the hydration of propylene.

US Patent:

6821922, Nov 23, 2004

Filed:

Sep 24, 1999

Appl. No.:

09/404537

Inventors:

Thomas Tacke - Paducah KY
Helmfried Krause - Rodenbach, DE
Hermanus G. J. Lansink Rotgerink - Mömbris-Mensengesä, DE
Francis Daly - Murray KY
Martin Reisinger - Haingründau, DE
Helmut Mangold - Rodenbach, DE

Assignee:

Degussa - HULS AG

International Classification:

B01J 2358

US Classification:

502330, 502242, 502243, 502253, 502262, 502326, 502328, 502339, 502340, 502344, 502407, 502439

Abstract:

Moldings based on pyrogenically produced mixed oxide having the following physicochemical parameters: are produced by homogenizing pyrogenically produced mixed oxide as desired with one or more compounds from the group methylcellulose, methylhydroxyethylcellulose, wax, polyethylene glycol, magnesium stearate and/or aluminium stearate with addition of water, drying the product at a temperature of 70-150Â C. , optionally comminuting the dried product to yield a powder, optionally compressing the powder to yield moldings and performing heat treatment for a period of 0. 5 to 10 hours at a temperature of 400 Â to 1200Â C. These moldings are then doped with suitable catalytically active components for the production of vinyl acetate monomer using a gas phase process.

US Patent:

63163837, Nov 13, 2001

Filed:

Jun 25, 1999

Appl. No.:

9/344488

Inventors:

Thomas Tacke - Paducah KY
Peter Schinke - Rodenbach, DE
Hermanus Lansink Rotgerink - Glattbach, DE
Helmfried Kraus - Rodenbach, DE

Assignee:

Degussa AG - Frankfurt am Main

International Classification:

B01J 2108
A47G 1922
B28B 2100
C04B 1404
C04B 3514

US Classification:

502232

Abstract:

Moldings based on silica having a hollow cylindrical configuration with internal reinforcing stays or spokes leading from an inner wall of a hollow cylinder to the center of the molding or in the form of miniliths having passageway channels therethrough, are produced by homogenizing silica with methyl hydroxyethyl cellulose, wax and/or polyethylene glycol. Water and optionally aqueous alkaline ammonia solution are added, and the mixture is subjected to kneading and forming, extruding, optionally cutting the extrudate to the desired length by means of a cutting device, drying at a temperature from 20 to 150. degree. C. , and annealing for a period from 30 minutes to 10 hours at a temperature of 400 to 1200. degree. C. The moldings can be used as catalyst supports for the production of unsaturated esters from olefins, organic acids and oxygen in the gas phase and and can be used in particular for the production of vinyl acetate monomer.

US Patent:

63038404, Oct 16, 2001

Filed:

Jun 18, 1999

Appl. No.:

9/269894

Inventors:

Martyn Poliakoff - Beeston, GB
Thomas M. Swan - Bedburn, GB
Thomas Tacke - Paducah KY
Martin G. Hitzler - Tachertiny, DE
Stephen K. Ross - Consett, GB
Stefan Wieland - Offenbach, DE
Fiona Ruth Smail - Beeston, GB

Assignee:

Thomas Swan & Co., Limited - Consett

International Classification:

C07C 270

US Classification:

585459

Abstract:

A process for the alkylation of aromatic substrates under supercritical or near-critical reaction conditions is described. In particular, a method for performing Friedel-Crafts alkylation reactions is disclosed under those conditions. Friedel-Crafts reactions may be effected using a heterogeneous catalyst in a continuous flow reactor containing a supercritical or near-critical reaction medium. Selectivity of product formation can be achieved by varying one or more of temperature, pressure, catalyst, flow rates and also by varying the ratios of aromatic substrate to alkylating agent.