Degussa Aktiengesellschaft

Degussa - Huls Ag

E.i. Dupont De Nemours and Company

Perstorp Specialty Chemicals Ab

Rudolf Vanheertum

Thomas Haas

Willi Hofen

Bernd Jaeger

J&ouml;rg Sauer

Marcus Morawietz

Olaf Burkhardt

Monika Berweiler

Andreas Freund

Daniel Ostgard

Walther Girke

Liane Deusser

Ralph Marquardt

Wilhelm Keim

Lukas M Von Hippel

Stephanie Schauhoff

Rudolf M Wagner

Andreas Gutsch

Manfred Sauer

Joerg Sauer

Roland Schaffer

Jorg Sauer

Matthias Creutz

J&uuml;rgen Glenneberg

Matthias Höpp

Walter B&ouml;rner

Karl-Heinz Vieweg

Torsten Hahm

Christine Schick

Robert Weber

Bernd J&auml;ger

Agnes Bourrel

Klaus Stadtmuller

Karl Ludwig Weber

Jörg Sauer

Walter Boerner

Raney copper which is doped with at least one metal from the group comprising iron and/or noble metals is used as a catalyst in the dehydrogenation of alcohols.

Raney copper

The invention relates to a method of producing cyanuric chloride by trimerizing chlorocyan at a temperature of at least 250&#xb0; C. on washed activated carbon as the catalyst. The service life of the catalyst can be improved by using an activated coal with an effective pore volume V eff of equal or greater 0.17 ml/g, with V eff being the result of pores with a pore diameter ranging from 0.5 to 7 nm.

Method of producing cyanuric chloride

In carrying out the hydrogenation stage of the anthraquinone process for the preparation of hydrogen peroxide in a hydrogenation reactor on a fixed bed catalyst of a particulate catalyst, the service life of the catalyst is increased in that the working solution comprising the reaction carrier and a gas phase comprising hydrogen, are passed through the hydrogenation reactor from the bottom upwards. The empty tube speed of the working solution is 0.05 to 100 m/h, preferably 10 to 50 m/h.

Process for the preparation of hydrogen peroxide

Carrier-bound ruthenium catalysts are used to produce alcohols by the catalytic hydrogenation of aldehydes and ketones. The problem of deactivation of the catalyst is solved by the use of a ruthenium catalyst on an oxide carrier of the series TiO , SiO , ZrO , MgO, mixed oxides thereof and silicates thereof. In particular, Ru on TiO or SiO results in a long service life of the catalyst.

Method of producing alcohols by catalytic hydrogenation of aldehydes or ketones

Acetone-cyanhydrin can be produced in a gas-liquid reactor from a hydrogen cyanide-containing gas, especially the crude gas originating from a methane-ammonia (BMA) or Andrussow process, and acetone in the presence of a base. The aim of the invention is to overcome the disadvantages of the methods for producing acetone-cyanhydrin known from the art. To this end, the gaseous phase removed from the reactor is liberated from the unreacted acetone and hydrogen cyanide in a gas purifier that is operated with a high-boiling solvent, especially with stabilized acetone-cyanhydrin, and the washed phase is fed to the gas-liquid reactor.

Method of producing acetone-cyanhydrin

The present invention provides an improved process for the hydrogenation of 3-hydroxypropanal to 1,3-propanediol which comprises purifying an aqueous solution of 3-hydroxypropanal by contacting said aqueous solution with a purifying agent prior to hydrogenation.

Catalytic hydrogenation of 3-hydroxypropanal to 1,3-propanediol

A two-stage process for producing 1,3-propanediol by first hydrogenating at a temperature of 30&deg; C. to 80&deg; C. in the presence of an oxide-supported metal hydrogenation catalyst. Second, the resulting reaction solution is hydrogenated at a temperature of 80&deg; C. to 180&deg; C. to a 3-hydroxypropanal conversion of substantially 100% in the presence of an activated carbon-supported metal hydrogenation catalyst.

Two-stage process for the production of 1,3-propanediol by catalytic hydrogenation of 3-hydroxypropanal

3-Hydroxypropanal is prepared by reacting acrolein with water under pressure and in the presence of an ion exchange resin while adding a carboxylic acid to the reaction mixture.

Process for the preparation of 3-hydroxypropanal

The reductive cleavage of linear and cyclic acetals, especially formals, in an aqueous medium containing a formate takes place by hydrogenation with hydrogen in the presence of a heterogeneous hydrogenation catalyst at a pH value of less than 7 at a temperature of over 200&deg; C. The catalyst-poisoning effect of the formate is overcome at over 200&deg; to 300&deg; C., especially from over 200&deg; to 280&deg; C., so that, in a suspension procedure, the weight ratio of metal having hydrogenating activity to acetal is less than 0.1.

Process for the reductive cleavage of linear and cyclic acetals especially formals

Reduction in the content of acetals or ketone acetals in a reaction mixture containing at least 10 moles alcohol per mole acetal or ketone acetal can be achieved hydrogenolytically when the reaction mixture is hydrogenated at 80&deg; to 250&deg; C. at a hydrogen partial pressure of 0.5 to 30 MPa in the presence of activated carbon charged with noble metal as catalyst.

Method for reducing the content of acetals or ketals in alcohol-containing reaction mixtures

The acid-catalyzed intermolecular etherification of mono- or polyhydric alcohols and acid-catalyzed ether cleavage in the presence of water may be improved if etherification or ether cleavage is carried out in the presence of an acid catalyst and, additionally, a hydrogenation catalyst under a hydrogen atmosphere. The process relates in particular to the etherification of diols, triols and tetrols with the formation of hydroxyethers.

Process for intermolecular etherification and ether cleavage

&bgr;-Hydroxyaldehydes are produced by a method in which 1,2-oxiranes are reacted with carbon monoxide and hydrogen in the presence of transitional metal compounds which are modified with phosphorus-oxygen ligands or nitrogen-oxygen ligands and which act as a catalyst.

Method of producing &bgr;-hydroxyaldehydes

A method of producing hydrogen cyanide by the gas-phase reaction of methane with ammonia at elevated temperature and an ammonia/methane ratio of 1.001 to 1.1. The conducting of the gaseous reaction mixture through a corona discharge causes the reaction to start at temperatures below 1000.degree. C. without the action of a catalyst. This results in considerable savings of the necessary investment expenses as well as of the running costs for energy.

Method of producing hydrogen cyanide

The present invention relates to a process for the production of five-membered or six-membered cyclic ethers, in particular of anhydropolyols, by acid-catalysed cyclodehydration of polyols that contain at least two hydroxyl groups with a spacing enabling ring formation--that is to say, preferably with a spacing of 4 or 5 C atoms. The invention is directed in particular towards the production of anhydrotetritols, anhydropentitols and, particularly preferred, anhydrohexitols, from tetritols, pentitols and hexitols, respectively.

Growing community of inventors

Kahl, Germany

Rudolf Vanheertum