Ultrapyrolytic heavy oil upgrading in an internally...

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 9/30 (2006.01) C10G 9/32 (2006.01)

Patent

CA 2141076

A process is described for ultrapyrolytic upgrading of a heavy hydrocarbon oil feedstock by contacting the feedstock in a confined riser vertical column with finely divided inert solid particles under ultrapyrolysis conditions, the riser forms part of an internally circulating aerated bed reactor with the bottom end of the riser being directly connected to an inlet nozzle feeding the heavy hydrocarbon oil feedstock and the upper end of-the riser extending above an annular aerated bed of the finely divided solid particles surrounding the riser. The riser also includes a plurality of orifices in a lower region thereof flow connected to a lower region of the aerated bed for controlled delivery of the particles from the aerated bed into the riser. The novel feature comprises continuously feeding an atomized stream of the heavy hydrocarbon oil feedstock upwardly through the inlet nozzle into the riser, continuously feeding finely divided solid heat carrier particles from the annular aerated bed into the riser through the orifices, contacting the particles and atomized feed within the riser under ultrapyrolysis conditions, continuously maintaining a level of particles in the aerated bed such that there is a net positive pressure difference between the aerated bed and the riser at the level of the orifices whereby riser gases are prevented from escaping into the annular bed, continuously removing particles and product gas from the upper end of the riser, continuously recycling the removed particles into the aerated bed and continuously withdrawing product gas from the system.

Cette invention concerne un procédé de valorisation par ultrapyrolyse du pétrole lourd. Le procédé prévoit la mise en contact de la matière première avec des particules solides inertes fines à l'intérieur d'une colonne confinée où règnent des conditions d'ultrapyrolyse. La colonne de traitement fait partie d'un réacteur à lit aéré à circulation interne, son extrémité inférieure étant directement raccordée à l'ajutage d'alimentation en pétrole lourd et son extrémité haute se prolongeant au-dessus d'un lit aéré annulaire de particules solides fines entourant ladite colonne. Celle-ci comporte également dans sa partie basse une série de trous communiquant avec la partie inférieure du lit aéré et servant à l'admission des particules fines dans son enceinte. La caractéristique inventive du procédé réside dans l'injection continue d'un flux atomisé vertical de pétrole lourd dans la colonne, l'admission continue de particules fines caloporteuses dans la colonne par les trous susmentionnés donnant sur la partie inférieure du lit aéré annulaire, la mise en contact du flux atomisé et des fines dans des conditions d'ultrapyrolyse, le maintien du lit aéré de particules au niveau nécessaire pour y assurer une surpression nette par rapport à la pression régnant dans la colonne, particulièrement au niveau des trous d'admission de fines, pour éviter que le gaz produit dans la colonne ne s'échappe vers le lit aéré, l'extraction continue des particules fines et du gaz produit par le haut de la colonne, le retour continu des particules vers le lit aéré et le soutirage continu du gaz épuré produit.

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