抄録
Four types of oils, coal derived middle distillate (MD); nontreated, oil freed from acid (FA), oil freed from base (FB) and neutral oil (N), were hydrotreated respectively to clarify the effect of eliminating acidic and/or basic compounds on their hydrotreatments. The runs were carried out over Ni-Mo/Al2O3 commercial catalysts (Ketjen KF840) in a fixed bed reactor at 350-390°C at hydrgen pressure of 5-15MPa with LHSV of 1h-1.
The catalyst activity of hydrodenitrogenation (HDN) was increased by eliminating basic compounds before the hydrotreatment. The degrees of deoxygenation of FA and N were lower than those of MD and FB, as most of the oxygen compounds were extracted by base pretreatment.
The weight ratios of tetralin/naphthalene in products were decreased during a short time on stream except hydrotreating of N. According to the tetralin/naphthalene ratio, it was concluded that the rate of hydrogenation was increased in the order: N>FB>FA>MD.
