Prediction of product distribution in delayed coking of Iranian vacuum residue
Volume Title: 1
1Amirkabir university of technology
2424 Hafez Ave, Tehran, Iran.Amirkabir University
3Refinery Process Development Division, Research Institute of Petroleum Industry (RIPI), West Blvd of Azadi Sport Complex,Tehran, Iran
To determine the impact of different operating conditions on the product yield distribution of delayed coking process, several experiments were set and conducted in a prefabricated pilot plant. The experiments were conducted with different Iranian vacuum residues and with the temperatures between 420-480ºC at atmospheric pressure. The reaction time was in the range of 5-120 min. A four lumps kinetic model was developed based on the experimental results. The lumps including volatile products, coke, feed and intermediate phase between coke and feed were defined to precisely monitor the yield distribution of products among the reaction time. The utilized feedstock for the process were three different vacuum residues and their blending. The mixtures were produced by using different mixing ratios of the three vacuum residues. The statistical results showed the satisfying accuracy of the developed model. The experimental and modeling results in this research approve that by increasing the temperature the yield of coke and gas is decreased. However, the yield of distillate is increased, too. The investigation illustrated that the activation of the production of intermediate has the highest amount of energy in comparison with the other reactions. Also, the results approve that the production reaction rate of coke has the highest amount in comparison with other reactions.