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The Effect of Operating Conditions of Solvent Deasphalting Process on the Characteristics of Coke Produced under Thermal Cracking

Hamidi Zirasefi, Mohammad | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48750 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorashe, Farhad; Ivakpour, Javad
  7. Abstract:
  8. Du to depletion of conventional petroleum reserves, the oil industry is faced with the challenge of developing technologies for processing heavy crude oil and petroleum residues that contain large amounts of asphaltenes and heavy metals including vanadium, nickel, and iron. So increasing need for processing of petroleum residues and full advantage of them in cases such as catalytic cracking and hydrogen units and also high-grade coke production in industries such as aluminum to be felt. In this work we used the vacuum distillation residue of Abadan heavy crude oil refinery in a solvent deasphalting (SDA) process at different temperatures (60 to 120 °C), pressures (5 ,7 and 9 bar), solvents (n-pentane and ethyl acetate), and with solvent to feed ratio of (5 to 1 and 7 to 1). The resulting products included deasphalted oil (DAO) and residual (PITCH). The DAO yields in SDA when n-pentane was used as solvent were significantly higher than those when ethyl acetate was used as solvent. The DAO was subsequently processed by thermal cracking at 500 °C and atmospheric pressure to investigate the effect of solvent deasphalting processing conditions on the yield of coke and liquid products as well as the metal and sulfur content of the coke were analyzed. The results indicated that SDA effectively removed up to 45% of vanadium and up to 40% of nickel from the vacuum residue. Simulated Distillation (SimDis) results of the liquid products of thermal cracking of DAO indicated that for both n-pentane and ethyl acetate as the SDA solvent, an increase in the solvent to feed ratio resulted in increased amount of lighter compounds (C5-C100) of the liquid products
  9. Keywords:
  10. Vacuum Residue ; Delayed Coking ; Thermal Break ; Thermal Crack ; Solvent Deasphalting

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