Abstract:
Provided is a method of production of catalyst support particles, containing zirconium dioxide and optionally silicon oxide, comprising the steps: (i) preparation of a solution containing precursor compounds of zirconium dioxide and optionally of silicon dioxide, (ii)conversion of the solution to an aerosol, (iii)bringing the aerosols into a directly or indirectly heated pyrolysis zone, (iv) carrying out the pyrolysis, (v)separation of the catalyst particles formed from the pyrolysis gas.
Abstract:
Un proceso para preparar cianuro de hidrógeno que comprende la provisión de formamida gaseosa mediante evaporar formamida líquida en un evaporador (etapa i) y a deshidratación catalítica de la formamida gaseosa (etapa II) y también un aparato para llevar a cabo el proceso de acuerdo con la invención, que comprende por lo menos un microevaporador y un reactor tubular, y el uso de un microevaporador para evaporar la formamida en un proceso para preparar cianuro de hidrógeno a partir de formamida.
Abstract:
The invention relates to a reactor (1) in the form of a horizontal cylinder for carrying out autothermal gas phase dehydrogenbation of a hydrocarbon-containing gas flow (2) by means of an oxygen-containing gas flow (3), with a reaction mixture being obtained, on a heterogeneous catalyst in the form of a monolith (4), characterized in that the interior of the reactor (1) is divided by a detachable cylindrical or prismatic housing G, which is disposed in the longitudinal direction of the reactor (1), gastight in the circumferential direction and open at both end faces thereof, into an inner area A, having one or a plurality of catalytically active zones (5), in which are provided a packing of monoliths (4) stacked on, adjacent, and above one another, and, in front of each catalytically active zone (5), a mixing zone (6) having fixed installations, and an outer area B disposed coaxially to the inner area A.
Abstract:
Un proceso para preparar cianuro de hidrogeno al deshidratar cataliticamente formamida gaseosa en un reactor tubular formado de por lo menos un canal de reaccion en el cual la deshidratacion catalitica procede, dicho canal de reaccion tiene una superficie interior que se forma a partir de un material que tiene un contenido de hierro de = 50% en peso, y no tiene presente catalizadores y/o internos adicionales en el canal de reaccion, y por lo menos un canal de reaccion tiene un diametro hidraulico medio de entre 0.5 a 6 mm, y un reactor con los rasgos especificados anteriormente y el uso del reactor de la invencion para preparar cianuro de hidrogeno al deshidratar cataliticamente formamida gaseosa.
Abstract:
A process for preparing hydrogen cyanide by catalytically dehydrating gaseous formamide in a tubular reactor formed from at least one reaction channel in which the catalytic dehydration proceeds, said reaction channel having an inner surface which is formed from a material having an iron content of ≧50% by weight, and no additional catalysts and/or internals being present in the reaction channel, and the at least one reaction channel having a mean hydraulic diameter of from 0.5 to 6 mm, and a reactor with the features specified above and the use of the inventive reactor for preparing hydrogen cyanide by catalytically dehydrating gaseous formamide.
Abstract:
A process for extractively removing homogeneously dissolved catalysts from a reaction effluent of a hydrocyanation of unsaturated mononitriles to dinitriles with a hydrocarbon H, including performing the steps of a) concentrating the reaction effluent before step b) by distillation at pressures of from 0.1 to 5000 mbar and temperatures of from 10 to 150° C., b) adding a hydrocarbon H to the concentrated reaction effluent to obtain a stream I, and c) feeding stream I, without prior separation of the liquid phases, into an extraction apparatus and extracting it at a temperature T with the hydrocarbon H to obtain a stream II comprising the hydrocarbon H enriched with the catalyst and a stream III having a low catalyst content.
Abstract:
Preparation of nickel(0)-phosphorus ligand complexes (Q) containing at least a nickel(0) as central atom and at least a ligand containing phosphorus comprises reacting a nickel(II) compound with a reducing agent in the presence of the ligand to obtain a reaction mixture and extracting the obtained reaction mixture by adding at least a dinitrile, at least a hydrocarbon and at least two immiscible phases. Preparation of nickel(0)-phosphorus ligand complexes (Q) containing at least a nickel(0) as central atom and at least a ligand containing phosphorus comprises reacting a nickel(II) compound with a reducing agent in the presence of the ligand to obtain a reaction mixture, and extracting the obtained reaction mixture by adding at least a dinitrile, at least a hydrocarbon and at least two immiscible phases, where: the amount of nickel(0) content in the reaction mixture is at most 1.3 wt.%; the molar ratio of: the reducing agent to the nickel(II) compound is 1:1-1000:1, which is calculated as the molar ratio of the redox equivalent, and the ligand containing phosphorus to the nickel(II) compound is at most 30:1, which is calculated as the molar ratio of phosphorus and nickel atoms. Independent claims are included for: (1) a mixture comprising (Q), obtained by the above process; and (2) a method for the isomerization of unsaturated nitrile to linear unsaturated nitrile using (Q) as catalyst, which is regenerated by circulation method.
Abstract:
La invención se refiere a un método para la producción de ácido cianhídrico, que consiste en la disposición de formamida gaseosa por evaporación de la formamida líquida en un evaporador (paso i)) y la deshidratación catalítica de la formamida gaseosa (paso ii)), y un dispositivo para llevar a cabo el método de acuerdo con la invención, el dispositivo consiste en al menos un microevaporador y un reactor tubular, y el uso de un microevaporador para evaporar formamida en un método para la producción de ácido cianhídrico a partir de formamida.