FIELD: gas-and-oil industry.
SUBSTANCE: invention refers to oil industry. The invention particularly refers to the procedure of preliminary purification of at least one crude P. According to the procedure this crude P is divided for several fractions. Produced out of crude P column effluents, not containing pyrobitumen, possibly subjected to hydro-purification and/or hydro-conversion, and/or hydro-cracking, are separated into three elementary flows a, b, c. Further, flows a produced out of different column effluents on different installations are mixed with flows b produced out of different column effluents on different installations to obtain at least two kinds of oil - Pa and Pb not containing pyrobitumen. Successively, there is produced one residual oil Pc containing major part of at least residual pyrobitumen. Also kinds of oil Pa and Pb produced on base of crude P have different ratios E determined from formula: E=(0.9 N+0.5 VGO+)/(MD+0.1 VGO+), where: N=naphta: percent contents by weight of the fraction, boiling at temperature within the range from 30°C to 170°C; MD=average distillates: percent contents by weight of the fraction boiling at temperature above 170°C and maximum at temperature 360°C; VGO+ weight percent contents of fraction boiling at temperature above 360°C.
EFFECT: increased efficiency of preliminary purification of crude.
12 cl, 2 ex, 1 tbl, 1 dwg
