Demetallisation of residual oils - with metal-silica catalysts with specified pore characteristics and a low loss on ignition

摘要

The demetallisation of residual oils before catalytic conversion is carried out by contacting the oil at high temp. and pressure, in the presence of H2, with a catalyst comprising one or more metals with hydrogenating activity on a support, the catalyst satisfying the following requirements: (1) p/d 3.5-0.02v, where p is the specific av. pore dia. (nm), d is the specific av. particle dia. (mm), and v is the percentage of the total pore vol. in pores with a dia. of 100 nm; (2) the total pore vol. is =0.40 ml/g; (3) v 50; (4) the specific surface is 100 m2; (5) when 3.5-0.02 p/d =10-0.15v, the N2 pore vol. is 0.60 ml/g, the specific surface is 150 m2/g and p 5 nm; (6) the catalyst contains 0.1-15 pts. wt. of the hydrogenating metals per 100 pts wt. of SiO2 support; (7) the loss on ignition of the catalyst is 1.0 wt. % (0.5 wt. % when vanadium is one of the hydrogenating metals). When condition (7) is met, catalysts satisfying requirements (1)-(6) have optimum activity. Catalysts satisfying requirement (1)-(5) are described in the parent patent.