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Laboratory Study on the Effect of Thermal Cracking of Heavy Oil

Rahmnai Khajeh, Saeed | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49938 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Dariush; Seifkordi, Ali Akbar; Safavi, Mohammad Ali; Shafeghat, Amin
  7. Abstract:
  8. The Visbreaking process is one of the Residue upgrading method, which, in addition to the production of mid-distillate products, also reduces the viscosity of feed. By reducing the viscosity of the feed, the amount of cutter stock is reduced to produce fuel oil. Since the refiners want to achieve the maximum conversion in the visbreaker unit, it is necessary to estimate the proper operating conditions and distribution of the products. Increasing in conversion in a visbreaker unit will lead to a refinancing profit. In this work, four Vacuum Residual oil from Iranian Refineries were selected for studying on visbreaking process. Experiments were carried out at RIPI-Petroleum Refining Technology Development Division, in modified batch Visbreaking Setup. The temperature range of experiments were 410-440 ˚C and pressure of 8 bar. In this experiments, the maximum allowed residence time was determined for each sample. The maximum allowed residence time is the residence time to reach the stability boundary. Stability boundary was determined using the IFP-3024-82 Standard Test Method. Product are divided into four groups Gas (hydrocarbons with carbon number less than five), Naphtha (C5-170 °C), Gas oil (170 °C-380 °C) and Tar (boiling point above 380 °C). The main objective of this research is to provide correlations for estimating the maximum residence time and distribution of products using operating conditions (such as temperature) and feed characteristics (such as SARA fraction). To verification of these corrolations, two vacuum residual of other Iranian refineries were selected. By testing on these two Feed, the error of the experimental Corrolation is determined and confirmation is given on the integrity of the proposed models or empirical corrolations
  9. Keywords:
  10. Visbreaking Process ; Thermal Break ; Fuel Oil ; Product Distribustion ; Oil Fractions ; Fuel Oil Stability ; Saturated Aromatic Resin Asphalthe (SARA)Fraction

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