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Characterization of Sulfur Protective Catalyst and Simulation of the Process of Removing Sulfur from Naphtha Product

Yousefi, Ardavan | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48807 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Baghalha, Morteza; Kazemini, Mohammad
  7. Abstract:
  8. Because of the importance of purification units at the refineries, in this research the process of sulfur removing compounds from light naphtha product with 1 ppm concentration by adsorption method in a fixed bed tower was simulated by COMSOL Multiphysics software. In this work, simulation was done using two macro and micro perspectives. In the Macro-scale mass transfer takes place between the spherical particles of catalyst and in the micro-scale mass transfer takes place within the spherical particles and these two scales were coupled together by reaction rate variable. In Macro-scale one-dimensional and two-dimensional geometry were considered for model. Naturally, the result of the making dimensionless, two-dimensional in the first case and three-dimensional In the second case was considered for micro-scale geometries. It should be noted that the adsorption of sulfur molecules was considered only in micro-scale and both equilibrium and kinetic approach was used to describe adsorption process. Then by comparing simulation results and experimental data, it was found that the case of two dimensional-three dimensional simulation results with respect to the equilibrium condition for adsorption in good agreement with the experimental data. permissible range of changes in equilibrium condition for Langmuir equilibrium constant (K_(L_(C_5 H_6 S) )) equal to 7×〖10〗^(-3) to 4.5×〖10〗^(-2) kg per mg and for maximum adsorption capacity (C_(P,max,C_5 H_6 S)) equal to 435 to 8550 mg per kg and in kinetic condition for adsorption constant (K_a) equal to 5×〖10〗^(-3) to 2.54×〖10〗^(-2) mg per kg per minute and for disorption constant (K_d) equal to 1.3×〖10〗^(-3) to 5.75×〖10〗^(-2) per minute respectively was obtained. Considering the constants listed in Table 3-1 tower Full saturation time was obtained equal to 57 days
  9. Keywords:
  10. Equilibrium ; Adsorption ; Simulation ; Fixed-Bed ; COMSOL Software ; Micro-Scales ; Macro Simulation ; Light Naphtha

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