COMBINED METHOD OF PRODUCTION OF MARINE FUELS AND PAVING BITUMEN (VERSIONS) Russian patent published in 2007 - IPC C10L1/04 C10G57/00 C10C3/02 

FIELD: production of marine fuels by high vacuum distillation of mazut, light thermal cracking of vacuum gas oils and oxidation of heavy tar oils; oil refining industry.

SUBSTANCE: proposed method is used for production of light marine fuel, high-viscosity light marine fuel and low-viscosity marine fuel. Light marine fuel and high-viscosity light marine fuel are used in marine power export plants according to international standard for marine fuels MS ISO/DIS-F-8217 and for export delivery. Proposed method consists in extraction of fractions by means of atmospheric-vacuum distillation followed by light thermal cracking of vacuum gas oils and blending of these fractions. According to proposed method, fractions of temperature of 180-360^°C at initial-boiling point of 400^°C and end-boiling point of 400^°C. For production of light marine fuel and/or marine high-viscosity light fuel, fraction of heavy vacuum gas oil at final-boiling point of 400^°C or mixture of this fraction with fraction of light vacuum gas oil at initial-boiling point of 400^°C is subjected to light thermal cracking followed by fractionating and separation of light fraction and residual fractions of secondary distillates at temperature of 200-400^°C and final-boiling point of 400^°C. Then, these fractions are blended in balance relation, thus producing marine high-viscosity fuel (wide fraction at boiling point higher than 200^°C) or at ratio of 50:50 for producing light marine fuel and/or marine low-viscosity fuel additionally entrapping the fraction of light vacuum gas oil at initial-boiling point of 400^°C observing the following ratio of components: 45:45:10-40:40:20, respectively. For obtaining marine low-viscosity fuel, part of fraction of light vacuum gas oil at initial-boiling point of 400^°C (up to 70%) blended with balance amount of fraction of heavy vacuum gas oil at end-boiling point of 400^°C is first subjected to light thermal cracking accompanied by separation of light gas oil at 200-400^°C, after which the secondary distillate thus obtained is blended with remaining part of fraction of light vacuum gas oil at initial-boiling point of 400^°C (up to 30%) and straight-run diesel fraction at 180-360^°C at ratio of 20:50:20 mass-%. Subjected to light thermal cracking is either fraction of heavy vacuum gas oil at final-boiling point of 400^°C and at final-boiling point not exceeding 500-560^°C due to unfavorable action of high-boiling fractions on quality of products or mixture of fractions of light and heavy vacuum gas oils at initial-boiling point of 400^°C and final-boiling point of 400^°C at balance ratio or at ratio of 20:80 at separation of secondary distillates at 200-400^°C and residue at end-boiling point of 400^°C which are basic components of marine high-viscosity fuel, marine light fuel and marine low-viscosity fuel.

EFFECT: low content of high-molecular hydrocarbons; reduced viscosity; enhanced fluidity and pumpability; low congelation point.

4 cl, 1 dwg, 6 tbl, 9 ex