METHOD FOR OPTIMISING THE PRODUCTION OF DISTILLATES COMPRISING A CATALYTIC CRACKING STEP

摘要

Method for optimising the production of middle distillate in a refinery, comprising at least one catalytic cracking unit (3) and at least one vacuum distillation unit (2, 4), the optimising operation consisting in:
a) recycling (14) at least part of the cut obtained by fractionation of the effluents from catalytic cracking of an atmospheric and/or vacuum residue, distilling at at least 320° C. also called 320° C.+ cut in the feed of the said vacuum distillation unit (4),b) distilling the said cut under vacuum into at least two fractions, a fraction distilling between 320° C. and 550° C. called the HCOSV fraction, and a fraction distilling at at least 550° C. called the SSV fraction,c) sending the HCOSV fraction (18) thereby obtained to at least one of the distillate treatment units,d) and sending the SSV fraction (13) to the feed of the catalytic cracking unit (3), as such or after intermediate upgrading treatment.

主权项

1. Method for optimising the production of middle distillate in a refinery, comprising at least one catalytic cracking unit with fractionation of the effluents for treating an atmospheric and/or vacuum residue type of feed and at least one vacuum distillation unit, the optimising comprising:
a) sending at least part of a cut obtained by fractionation of the effluents from the catalytic cracking of the said feed, distilling at at least 320° C. also called 320° C.+ cut in the feed of the said vacuum distillation unit, b) distilling the said cut under vacuum into at least two fractions, a fraction distilling between 320° C. and 550° C. called the HCOSV fraction, and a fraction distilling at at least 550° C. called the SSV fraction, c) sending the HCOSV fraction thereby obtained to at least one distillate treatment unit, and d) sending the SSV fraction, as such or after intermediate upgrading treatment, to the feed of the catalytic cracking unit and/or to heavy fuel oil blending and storage units.