Process for the production of Raney nickel catalysts and their use in the hydrogenation of organic compounds
View Patent ↗The invention relates to a process for the production of Raney nickel catalysts. In this process, the melt of an alloy comprising from 40 to 95 wt. % aluminum, from 5 to 50 wt. % nickel, 0 to 20 wt. % iron, from 0 to 15 wt. % of one or more transition metals selected from the group consisting of cerium, cerium mixed metal, vanadium, niobium, tantalum, chromium, molybdenum and manganese, and, optionally, additional glass-forming elements, is brought into contact with one or more rotating cooling rollers or cooling plates and is allowed to cool and solidify thereon. The cooling rollers have a surface structured by means of transverse grooves, and the cooling plates have a surface structured by means of grooves extending outwards from the axis of rotation. The rapidly solidified alloy on the cooling rollers or the cooling plates is then subjected to treatment with one or more organic or inorganic bases.
1. A process for the production of Raney nickel catalysts, comprising
(1) contacting (a) the melt of an alloy which comprises (i) from 40 to 95 wt. % aluminum, (ii) from 5 to 50 wt. % nickel, (iii) from 0 to 20 wt. % iron, (iv) from 0 to 15 wt. % of one or more transition metals selected from the group consisting of cerium, cerium mixed metal, vanadium, niobium, tantalum, chromium, molybdenum and manganese, and, (v) optionally, additional glass-forming elements; with (b) one or more rotating cooling rollers or cooling plates, wherein the surface of said cooling rollers is structured by means of transverse grooves and the surface of said cooling plates is structured by means of grooves which extend outwardly from the axis of rotation,
(2) allowing the melt to cool and solidify on said rotating cooling rollers or cooling plates; and
(3) treating the rapidly solidified alloy with one or more organic bases and/or inorganic bases.
2. The process of claim 1 , wherein said contacting comprises overflowing of the melt formed in the melt overflow process from a melting crucible onto a rotating cooling roller.
3. The process of claim 1 , wherein said contacting comprises dipping a rotating cooling roller which is positioned above the alloy into the melt formed, thereby removing a portion of the alloy melt formed, and allowing the to cool and solidify on the cooling roller, in which the surface of the rotating cooling roller has transverse grooves.
4. The process of claim 1 , wherein said contacting comprises pouring the melt onto a rotating cooling roller or into the gap between two cooling rollers which are rotating in opposite directions.
5. The process of claim 1 , wherein said contacting comprises pouring of the melt onto a rotating cooling plate.