| 摘要 |
During operation, medium distillate, representing 0.5-80 wt% of the hydrocarbon charge, is introduced into the first guard zone inlet, simultaneously with the charge. Preferred features: Distillate introduced at atmospheric pressure, is a gas oil formed by direct distillation. The product from hydrodesulfurization is sent to a zone of atmospheric distillation. Atmospheric residue and distillate are recovered, part of the latter being recycled to the inlet of the first operational guard zone. Part of a gas oil fraction from the atmospheric distillation following hydro de-sulfurization is sent to its inlet. The gas oil fraction is a cut with initial boiling point 150 deg C and final boiling point about 370 deg C. The quantity of atmospheric distillate and/or of gas oil introduced with the charge to the inlet of the first operational guard zone, represents about 1-50 wt% of the charge. Atmospheric residue from atmospheric distillation is sent to vacuum distillation. Vacuum residue and distillate are recovered, the latter being recycled to the inlet of the first operational guard zone. Atmospheric and/or vacuum residues are sent to a catalytic cracker, to recover light and heavy cracked fractions. These are sent individually or as a mixture to the inlet of the first operational guard zone. Further details an variant based on the foregoing principles are described.
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