METHOD OF OBTAINMENT OF DISTILLATE FRACTIONS DURING PRIMARY OIL REFINING Russian patent published in 1997 - IPC

FIELD: production of gasoline, fuel and oil fractions during primary oil refining. SUBSTANCE: heated oil is distilled in column for partial gasoline refining, obtained still bottoms is directed into atmospheric column fitted with steaming sections and circulation refluxing. Gasoline is extracted from top of atmospheric column, kerosine, light and medium diesel fractions in the form of side fractions. Fuel oil from still of atmospheric column is heated in furnace and is injected into vacuum column where diesel fuel fraction, wide fractions of vacuum gas oil or narrow oil fractions and tar in the form of still residue are obtained. Fraction of 260-380 C is taken in the capacity of diesel fraction from vacuum column, part of it in the form of liquid flow is fed into line of circulation refluxing of basic atmospheric column into zone below tap of side fraction of medium diesel fraction in stripping section of atmospheric column. Quantity of 260-380 C fraction amounts to 4.0-20.0% of total mass of needed lower refluxing. EFFECT: enhanced efficiency of method. 1 dwg, 3 tbl