Process for producing spherical oxide particles

Details Process for producing spherical oxide particles Process for producing spherical oxide particles

B - Operations, Transporting

01

J

B01J 2/22 (2006.01) B01J 23/85 (2006.01) B01J 35/08 (2006.01) B01J 37/00 (2006.01)

Patent

CA 2331454

The invention pertains to a process for preparing spherical oxide particles comprising the steps of shaping a starting material comprising an oxide hydrate into particles of substantially constant length by leading the material to a set of two rolls rotating towards each other followed by leading the material to a roll equipped with grooves to form rod- type shapes, cutting the rod-type shapes into particles of substantially constant length, converting the thus formed particles into spheres, and heating the particles to convert the oxide hydrate into an oxide. The process results in particles in which there is substantially no difference in density between the core portion and the shell portion of the particles, which results in a high abrasion resistance. The particles prepared by the claimed process are particularly suitable for the preparation of hydroprocessing catalysts, more in particular for the preparation of hydroprocessing catalysts suitable for the hydroprocessing of heavy hydrocarbon feeds.

L'invention se rapporte à un procédé de préparation de particules d'oxyde sphériques, consistant à façonner une matière de départ contenant un hydrate d'oxyde de manière à obtenir un produit de longueur sensiblement constante. Ledit procédé consiste à faire passer la matière de départ par un ensemble de deux cylindres tournant en direction l'un de l'autre, puis à l'amener vers un cylindre muni de sillons de manière à produire des formes de type tiges, à découper les formes de type tiges en particules de longueur sensiblement constante, à transformer les particules ainsi formées en sphères et à chauffer les particules obtenues de manière à convertir l'hydrate d'oxyde en oxyde. Ce procédé permet d'obtenir des particules ne présentant sensiblement aucune variation de densité entre la partie constituant le coeur des particules et celle constituant leur enveloppe, ce qui leur confère une grande résistance à l'abrasion. Les particules préparées selon le procédé de cette invention sont particulièrement adaptées à la préparation de catalyseurs d'hydrotraitement, et notamment de catalyseurs destinés à l'hydrotraitement des charges lourdes d'hydrocarbures.

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