FIELD: chemistry.
SUBSTANCE: invention relates to a method of improving the quality of still residue in a system, comprising the presence of a first fluidised bed reactor; first separator; of the stripping column; distillation system and solvent deasphalting system. Method includes operation of system in first mode to produce raw material for installation of residue fluid catalytic cracking (RFCC), wherein the first mode is carried out in the distribution of particles in size, which provides low pressure drop in the range of expansion of the catalyst layer from 5 to 25 %. Operation of system in second mode to maximize residue conversion in first fluidised bed reactor, wherein the second mode is carried out when particles are sized to provide a low pressure drop in the range of expansion of the catalyst layer from 40 to 60 %. Switching of the system between the first mode and the second mode, the transition involves removing the hydrotreating catalyst from the first fluidised bed reactor while simultaneously adding the hydrocracking catalyst to the first fluidised bed reactor and increasing the speed of the ebb pump; distillation of the first liquid phase in the distillation system with production of at least one atmospheric distillate and atmospheric residues.
EFFECT: technical result is improvement of flexibility of residues hydrocracking processes, which provide high conversion of bottom residues, reduce total amount of equipment, reduce total size of hydrocracking reactor equipment and/or solvent deasphalting and require less frequent replacement of hydrocracking catalyst.
9 cl, 1 ex, 2 tbl, 5 dwg
