Catalytic activity of several oil-soluble molybdenum compounds was tested for upgrading low-quality heavy oil by high pressure thermalhydrotreatment.
Reactions were performed by use of an autoclave of 300m1 capacity at temperature 470°C, reaction time 10min., initial hydrogen pressure 100kg/cm
2 and stirring rate 1, 500ppm.
Venezuela Morichal crude (S 4.19wt%, N 0.67wt%, V 463ppm, Ni 100ppm, C
5-insoluble asphaltenes 17. 5wt%) was used as a feed.
Molybdenumdithiophosphates, which are usually used as lubricant oil additives, were found to show high activity for sulfur and vanadium removal. Their activity was further enhanced by the addition of oil soluble cobalt compounds. The role of P and S in the activity enhancement for Mo catalysts was investigated with a variety of combinations of oil-soluble Mo, Co, P and S compounds. It was revealed that the addition of P compounds is essential for vanadium removal and the coexistence of P and S is effective for the removal both of sulfur and vanadium. Recycle use of the Mo-Co-P-S catalyst, which could be recovered as a solid matter, resulted in a gradual decline of activity. However, even after 3 to 4 recycle uses, its activity was still higher than the initial activity of conventional Co-Mo-Al
2O
3 catalyst.
抄録全体を表示