Nickel-containing hydrogenation catalysts

B - Operations – Transporting – 01 – J

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B01J 23/755 (2006.01) C10G 45/48 (2006.01) B01J 37/03 (2006.01)

Patent

CA 2185588

Catalysts suitable for hydrogenating organic compounds, essentially containing 65 to 80 % nickel calculated as nickel oxide, 10 to 25 % silicon calculated as silicon dioxide, 2 to 10 % zirconium calculated as zirconium oxide, 0 to 10 % aluminium calculated as aluminium oxide, with the proviso that the sum of the silicon dioxide and aluminium oxide contents is at least 15 %, with the percentages by weight in relation to the total mass of the catalyst, obtainable by the addition of an acid aqueous solution of nickel, ziconium and, if desired, aluminium salts to a basic aqueous solution or suspension of silicon compounds and, if desired, aluminium compounds, the pH of the mixture thus obtained being reduced to at least 6.5 and subsequently adjusted to 7 to 8 by the addition of a further basic solution, isolation of the solid thus precipitated, drying, shaping and calcinating, in addition a process for producing the catalysts and their use in the production of medicinal white oil, highly pure medicinal paraffins and low-boiling-point non-aromatic hydrocarbon mixtures.

Des catalyseurs se prêtant à l'hydrogénation de composés organiques, comportant essentiellement de 65 à 80 % de nickel, exprimé en oxyde niccoleux, de 10 à 25 % de silicium, exprimé en dioxyde de silicium, de 2 à 10 % de zirconium, exprimé en oxyde de zirconium, de 0 à 10 % d'aluminium, exprimé en oxyde d'aluminium, à la condition que la somme de la teneur en dioxyde de silicium et oxyde d'aluminium se monte à 15 % au moins - pourcentages en poids par rapport à la masse totale du catalyseur -, pouvant être obtenus par addition d'une solution aqueuse acide de sels de nickel, de zirconium et, le cas échéant, de sels d'aluminium, ce qui donne une solution aqueuse basique ou suspension de composés de silicium et, le cas échéant, des composés d'aluminium, la valeur pH du mélange ainsi obtenu étant abaissée à 6,5 au moins, puis réglée par addition ultérieure de solution basique à une valeur comprise entre 7 et 8. On procède ensuite à l'isolation de la matière solide ainsi précipitée, à son séchage, à son formage et à sa calcination. Sont en outre décrits un procédé pour la fabrication des catalyseurs ainsi que leur utilisation pour la fabrication d'huile blanche médicale, de paraffines médicinales de grande pureté et de mélanges d'hydrocarbures non aromatiques à bas point d'ébullition.

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