Abstract:
The invention relates to novel ruthenium catalysts which can be obtained by: 1) single or multiple treatment of an amorphous silicon dioxide based carrier material with a halogen-free aqueous solution of a low-molecular ruthenium compound and subsequent drying of the treated carrier material at a temperature of less than 200 DEG C, ii) reduction of the solid obtained in I) with hydrogen at a temperature ranging from 100 to 350 DEG C, wherein step ii) is carried out directly after step i). The invention also relates to a method for the production and use thereof in catalytic hydrogenation of monosaccharides and disaccharides for the production of sugar alcohols with the exception of sorbit.
Abstract:
The invention relates to a method for producing hydrocarbons having a modified carbon skeleton by reacting aliphatic hydrocarbons a) with themselves, b) with another aliphatic hydrocarbon or c) with aromatic alkyl substituted hydrocarbons, in the presence of a metal organic catalyst or the hybrid thereof, at a temperature of between 20 - 400 DEG C and a pressure of between 0.2 - 100 bars, wherein the reaction takes place in the presence of hydrogen.
Abstract:
The invention relates to a method for the production of sorbit by catalytic hydrogenation of a monosaccharide forming sorbit during said hydrogenation in a liquid phase, characterized in that the catalyst is obtained by 1) single or multiple treatment of an amorphous silicon dioxide based carrier material with a halogen-free aqueous solution of a low-molecular ruthenium compound and subsequent drying of the treated carrier material at a temperature of less than 200° C, ii) reduction of the solid obtained in I) with hydrogen at a temperature ranging from 100 to 350° C, wherein step ii) is carried out directly after step i).
Abstract:
A method for the production of cycloaliphatic compounds (I) having side chains with expoxy groups by heterogenous-catalytic hydrogenation of a compound (II) having at least one carbocyclic, aromatic group and at least one side chain with at least one epoxy group, on a ruthenium catalyst, characterized in that the ruthenium catalyst is obtained by i) single or multiple treatment of an amorphous silicon dioxide based carrier material with a halogen-free aqueous solution of a low-molecular ruthenium compound and subsequent drying of the treated carrier material at a temperature of less than 200 DEG C, ii) reduction of the solid obtained in I) with hydrogen at a temperature ranging from 100 to 350 DEG C, wherein step ii) is carried out directly after step i).
Abstract:
A catalyst comprising nickel on a TiO 2 support is obtainable by coprecipitation of nickel and at least one further metal selected from among Si, Zr, Hf, alkaline earth metals, Y, La and Ce, and optionally at least one dopant metal selected from groups 5 to 11 of the Periodic Table of the Elements, from a solution in which the corresponding metal salts are present onto a particulate TiO 2 support, subsequent drying, calcination and reduction and optionally passivation to give the nickel-containing catalyst. It is used, in particular, for the hydrogenation of nitroaromatic compounds.
Abstract:
The invention provides a process for preparing amines by catalytic hydrogenation of nitroaromatics and subsequent removal of the catalysts from the reaction mixture, which contains at least one aromatic amine and water, which comprises carrying out the removal of the catalysts by means of membrane filtration, which is carried out at a pressure on the suspension side of from 5 to 50 bar, a pressure difference between the suspension side and the permeate side of at least 0.3 bar and a flux rate on the suspension side of from 1 to 6 m/s.
Abstract:
Providing a ruthenium catalyst for the production of sugar alcohols. Ruthenium catalysts (I) are prepared by: (A) a single or multiple treatment of an amorphous silicon dioxide support material with a halogen free solution of a low mol. wt. ruthenium compound followed by drying at below 200 [deg]C; (B) reduction of the resulting solid with hydrogen at 100-350 [deg]C such that step (B) is carried out immediately after step (A). An independent claim is included for a process for the production of sugar alcohols by catalytic hydrogenation of the corresponding mono- and oligosaccharides in the liquid phase at the heterogeneous catalyst (I), excluding a process for the production of sorbitol.
Abstract:
The invention provides a process for preparing amines by catalytic hydrogenation of nitroaromatics and subsequent removal of the catalysts from the reaction mixture, which contains at least one aromatic amine and water, which comprises carrying out the removal of the catalysts by means of membrane filtration, which is carried out at a pressure on the suspension side of from 5 to 50 bar, a pressure difference between the suspension side and the permeate side of at least 0.3 bar and a flux rate on the suspension side of from 1 to 6 m/s.
Abstract:
A process is described for preparing sorbitol by catalytic hydrogenation of a monosaccharide forming sorbitol on hydrogenation in the liquid phase, which comprises the catalyst being obtainable by: i) single or multiple treatment of an amorphous silicon dioxide based support material with a halogen-free aqueous solution of a low-molecular-weight ruthenium compound and subsequent drying of the treated support material at below 200° C., ii) reducing the solid obtained in i) with hydrogen at from 100 to 350° C., step ii) being carried out immediately after step i).