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...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.展开更多
文摘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.
