| 摘要 |
A method for optimising the production of middle distillate within a refinery comprising at least one catalytic cracking unit (3) and at least one vacuum distillation unit (2, 4), the optimising operation consisting: a) of recycling (14) at least part of the cut obtained by fractionating the catalytic cracking effluents of an atmospheric and/or vacuum residue, distilling at at least 320°C, also known as cut 320°C+, in the load of said vacuum distillation unit (4), b) of vacuum-distilling said cut into at least two fractions, one fraction distilling within the range of 320°C and 550°C known as fraction HCOSV, and one fraction distilling at at least 550°C known as fraction SSV, c) of sending the HCOSV fraction (18) thereby obtained to at least one of the distillate processing units, d) and of sending the SSV fraction (13) back into the load of the catalytic cracking unit (3), either as it is or after an intermediate reprocessing treatment. |
