L'invention concerne un procede ameliore de preparation de 3-aminomethyl-3,5,5-trimethylcyclohexylamine, denommee ci-apres isophorone diamine ou IPDA sous forme abregee, par hydrogenation catalytique et/ou amination reductive catalytique (egalement designee hydrogenation aminante) de 3-cyano-3,5,5-trimethylcyclohexanone, denommee ci-apres isophorone nitrile ou IPN sous forme abregee.

The invention relates to a multistage process for the continuous chloro-poor preparing cycloaliphatic diisocyanates, the synthesis diaminodiphenylalkanes, their hydrogenation to give the corresponding cycloaliphatic diamines and the subsequent conversion of cycloaliphatic diamines in the corresponding Cycloalkylenbiscarbamate and the thermal cleavage latter cycloaliphatic in the diisocyanates and comprises alcohol.

The invention relates to an improved process for preparing trimethylhexamethylenediamine, abbreviated TMD called by hydrogenation of trimethylhexamethylenedinitrile, hereinafter abbreviated as TMN called, in the presence of a hydrogenation catalyst, formed by Raney.

The sol–gel process has been used to prepare porous amorphous mixed oxides (AM) of Si with Al, Ti, and Zr, covering a wide range of composition. The effect of heating on porosity, crystallinity, and microstructure has been investigated by a variety of methods (Ar-adsorption isotherms, high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray analysis (EDX), X-ray powder diffraction (XRD), FTIR in diffuse reflectance mode (DRIFTS). The effect of impregnation and doping on the temperature stability of selected oxides is shown. Several compositions show a surprisingly high temperature stability. An amorphous porous AM-Si10Al (amorphous mixed-oxide with 10 mol% SiO2 in Al2O3), stabilised with an additional 5 mol% silica, has been obtained, whose microstructure is stable up to 1400°C with no indication of phase separation or nanocrystal formation. A detailed characterisation of this material and its application as support material in methane combustion is presented. The study shows that amorphous mixed oxides may offer a promising new approach to the development of high temperature stable porous materials.

Mit bis zu 70 unterschiedlichen Metallsalzen dotiert wurden drei Halbleiteroxide (TiO2, SnO2 und WO3), um so drei Bibliotheken aus Mischoxiden zu erhalten. Unter diesen fanden sich in einem Hochdurchsatzverfahren über 30 Oxide, die ähnlich wie das bekannte Pt-dotierte TiO2 in der Lage sind, bei Bestrahlung mit sichtbarem Licht die Zersetzung von 4-Chlorphenol, einer Modellsubstanz für in Wasser auftretende Schadstoffe, zu katalysieren. Zwei der neuen Materialien (Ir-dotiertes WO3 und Ce-dotiertes SnO2) wurden konventionell synthetisiert, und ihre katalytische Aktivität konnte bestätigt werden.

Doped with up to 70 different metal salts, three semiconductor oxides (TiO2, SnO2, and WO3) formed the basis of three libraries of mixed oxides. From a high-throughput method, over 30 oxides were found to have activities similar to the well-studied Pt-doped TiO2 towards the catalyzed decomposition of a model pollutant 4-chlorophenol in water on irradiation with visible light. Two of the new materials (Ir-doped WO3 and Ce-doped SnO2) have been reproduced by conventional synthesis, and their catalytic activity was confirmed.

Process for the preparation of isophorone diamine from isophorone nitrile, isophorone-nitrile-imine or mixtures containing isophorone nitrile and isophorone nitrile imine by hydrogenation through to amine in the presence of at least ammonia and hydrogen, used a catalyst of Raney cobalt base molding, wherein the Raney catalyst is in the form of hollow bodies.