减压渣油供氢剂减黏裂化研究

The roles of such classical hydrogen-donor solvents as tetralin, decahydronaphthalene, dihydrophenanthrene and dihydroanthracene in visbreaking of vacuum residue were examined. It revealed that the effect of the hydrogendonor solvents could be ranked as dihydrophenanthrene≈dihydroanthracene> tetralin> dihydrophenanthrene and that the appropriate amount added was around 15％. Further studies showed that the coke formation can be greatly reduced by adding hydrogen-donor solvents, consequently the hydrogen-donor approach allowed the operation of visbreaking at higher severity. The effect of hydrogen could be negligible when the hydrogen pressure was lower than 2.5MPa.