HYDROCARBON FEEDSTOCK DISTILLATION PROCESS TO PRODUCE FUEL FRACTIONS Russian patent published in 2003 - IPC

FIELD: petroleum processing. SUBSTANCE: invention concerns petroleum processing on low-scale plants in order to produce motor fuels in oil production and transportation areas. Petroleum distillation aiming to produce fuel fractions is effected by rectification on atmospheric column tapping from the column top gasoline fraction and withdrawing, as sidestreams, kerosene and diesel fraction, which are then stripped on stripping columns. Low-boiling hydrocarbon vapors from the top of stripping columns are returned into atmospheric column. Rectification involves ejection of non-condensed hydrocarbon gases (2-6 wt %) by introduced raw material. Stripping agents in primary and stripping columns are superheated vapors of gasoline fraction with dry point 130 C freed of water and noncondensable hydrocarbon gases. Mazut discharged from the still of atmospheric column is heated and fed into vacuum column, from the bottom of which heavy residue and from the top diesel fraction are obtained, the latter fraction being used as working medium in ejection evacuating installation disposed on the top of vacuum column. EFFECT: increased yield and improved quality of light fuel fractions. 1 dwg