Sharif Digital Repository

Hydrocracking is a hydrogen addition process that permits refineries to convert heavier, less expensive crudes, into highly-valued transportation fuels such as gasoline, kerosene and diesel. Development of an accurate kinetic model for hydrocracking reactions is crucial to correctly predict the detailed product distribution under different operating conditions for a range of feedstocks as well as for reactor design, process optimization and catalyst selection. In this thesis a mechanistic kinetic model was developed for thermal hydrocracking of a paraffinic feedstock. This model was based on a molecular approach that was able to capture the fundamental chemistry of hydrocracking process. To... 

Hydrocracking is one of the most versatile petroleum refining process for production of valuable products including gasoline, gas oil, and kerosene. Various kinetic models have been proposed for hydrocracking process. A commonly used approach is to consider the mixture in terms of selected lums, which can be specified in terms of structural characteristics, such as boiling point. From this approach the reaction mixture can be considered in two types of discrete lumping and continuous lumping. In this thesis, a 5 parameter continuous kinetic lumping model was studied for modeling of the Isomax reactor of Tabriz refinery whose feedstock is a low quality gasoil from vaccum distillatin column.... 

In this project, for hydrodynamic simulation of RIPI experimental bubble column with concerning chemical reaction, first only hydrodynamic simulation and then hydrodynamic with reaction was done. For complete knowledge about bubble columns hydrodynamic, all common flow regimes were studied. First of all a rectangular semi-batch bubble column with bubbly flow regime and gas flow of 0.26 m3/h was simulated with commercial CFD software, FLUENT v. 14.5. Euler-Euler approach in 2D and 3D was used and because of bubbly flow regime a mean constant diameter was assumed for dispersed gas phase. Effect of interfacial forces (e. g drag, lift and virtual mass) was studied and compared with experimental...