METHOD OF DISTILLATION SEPARATION OF C-FRACTIONS Russian patent published in 2006 - IPC B01D3/14 B01D3/42 

FIELD: petrochemical industry; oil processing industry; methods of distillation separation of C₅₊-fraction.

SUBSTANCE: the invention is pertaining to the method of distillation separation of C₅₊-fractions for the low-boiling fraction (A), the middle-boiling fraction (B) and high-boiling fraction(C). The method may be realized in one or several columns (TK) with partitions, in which the partition (T)is located in the longitudinal direction of the column with formation of the upper common zone (1) of the column, the lower common zone (6) of the column, the inlet section (2, 4) with the strengthening section (2) and the exhausting section (4), and also the separable sections (3, 5) with the strengthening section (5) and the exhausting section (3), with feeding of C₅₊ -fraction (A,B, C) into the middle zone of the inlet section (2, 4), withdrawal of the high-boiling fraction (C) from the column still, the low-boiling fraction (A) through the top of the column and the middle-boiling fraction (B) from the middle zone of the separable section (3, 5). The ratio, at which the wet reflux is self-divided at the upper edge of the partition (T), is determined in such a manner, that the share of the high-boiling key components in the wet reflux running down through the exhausting section (3) of the separable section makes at the upper edge of the partition (T) from 10 up to 80 %, preferably - from 30 up to 50 % of the maximum value allowable in the middle-boiling fraction (B), and that the power of heating in the vat evaporator of the column (TK) with the partition is determined in such a manner that concentration of the low-boiling key components in the liquid at the lower edge of the partition (T)makes from 10 up to 80 %, preferentially - from 30 up to 50 % of the limiting value allowable in the middle-boiling fraction (B).

EFFECT: the invention ensures 30-50% withdrawal of the low-boiling, the middle-boiling and the high-boiling fractions at realization of the method of distillation separation of C₅₊-fractions.

14 cl, 12 dwg