Heterogeneous liquid-phase crystallisation of diamond

C - Chemistry – Metallurgy – 01 – B

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C01B 31/06 (2006.01) C30B 29/04 (2006.01)

Patent

CA 2334763

The present invention relates to a principle for the heterogeneous liquid- phase crystallisation of diamond, wherein said crystallisation is carried out on the heterogeneous surface of a catalyst. This surface is characterised in that, during the high-temperature dehydrogenation process of heavy hydrocarbons containing bitumen-tar and asphaltenes, the catalyst performs a chemisorption of hydrogen under an atomic form. The catalyst surface submitted to the chemisorption exhibits a characteristic which is essential for the crystallisation of diamond in that only the growth of crystalline carbon- diamond is possible. This invention also relates to a method for implementing this principle with a yield in excess of 3,000 carats of diamond crystals having various fractions of between 100 and 1000 microns. During the experiments, the largest diamond crystal obtained had dimensions of 3.5 x 3.5 mm, while the production of diamond crystals with maximal dimensions was not contemplated as a goal.

Cette invention concerne un principe de cristallisation hétérogène et en phase liquide de diamant, laquelle cristallisation se déroule sur la surface hétérogène d'un catalyseur. Cette surface se caractérise en ce que, lors du processus de déshydrogénation à haute température d'hydrocarbures lourds de bitume-goudrons et d'asphaltènes, le catalyseur effectue une sorption chimique de l'hydrogène sous une forme atomique. La surface du catalyseur soumise à la sorption chimique possède une qualité qui est essentielle lors de la cristallisation du diamant en ce que seule la croissance de carbone cristallin-diamant est possible. Cette invention concerne également un procédé de mise en oeuvre pratique de ce principe. Ce principe permet d'obtenir plus de 3000 carats de cristaux de diamant qui possèdent diverses fractions allant de 100 microns à 1000 microns. Lors des expériences qui ont été menées, le cristal de diamant le plus grand qui ait été obtenu possédait des dimensions de 3,5 x 3,5 mm, ceci sans s'être fixé pour but d'obtenir des cristaux de diamant ayant une taille maximale.

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