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The Study Of The Hydrodynamic Characteristics Of Vertical Upflow Gas-Solids Suspension In The Dilute And Dense Phase Regimes, Steven Lai-Kwok Mok
The Study Of The Hydrodynamic Characteristics Of Vertical Upflow Gas-Solids Suspension In The Dilute And Dense Phase Regimes, Steven Lai-Kwok Mok
Digitized Theses
The present experimental work deals with the study of the hydrodynamic characteristics exhibited by a concurrent upflow gas-solids suspension under fully developed flow conditions in the dilute and the dense phase flow regimes. Pressure drop and the mean solids volumetric concentration were measured in vertical transport line of 20 mm inside diameter using sand particles with an average particle diameter of 210 {dollar}\mu{dollar}m. Mean solids concentration of more than 7 percent and solids loading ratios as high as 75 were obtained in the experiments. The mean solids concentration was measured by trapping the particles in a 4.32 m long test …
Pseudoadiabatic Catalytic Reactor For The Direct Conversion Of Synthesis Gas Into Hydrocarbons, Francois Simard
Pseudoadiabatic Catalytic Reactor For The Direct Conversion Of Synthesis Gas Into Hydrocarbons, Francois Simard
Digitized Theses
This dissertation describes the study of the Pseudoadiabatic fixed-bed catalytic reactor for the one-step conversion of synthesis gas into gasoline using a bifunctional catalyst. The bifunctional catalyst allows to combine the thee steps of methanol synthesis, methanol dehydration and methanol conversion to gasoline, occurring in the adiabatic configuration of the Mobil MTG process, in one single reactor. Moreover, the use of the Pseudoadiabatic reactor offers good control of the temperature distribution, thermal symmetry and reduced parametric sensitivity for this very exothermic reaction.;The catalyst used in the context of this research was a bifunctional catalyst composed of a mixture of a …
Kinematic Waves And Governing Equations In Bubble Columns And Three-Phase Fluidized Beds, Lopez Alberto Soria
Kinematic Waves And Governing Equations In Bubble Columns And Three-Phase Fluidized Beds, Lopez Alberto Soria
Digitized Theses
New averaged topological equations (ATEs) were obtained from a geometric description of a dispersed two-phase flow using the derivatives of a multi-step and a multi-delta distribution functions as well as a local volume averaging technique. Similar distribution functions were also defined and combined for the obtention of averaged transport equations for multiphase systems considering relevant interfacial effects. A consistency test performed on the set of averaged transport equations shows that the approach followed renders a self-consistent set of governing equations for a multiphase system with an arbitrary number of phases and relevant interfacial effects. Combination of the ATEs and the …
Enhancement Of Gas-Liquid And Particle-Liquid Mass Transfer In Bubble Columns And Three-Phase Fluidized Beds, Anand Prakash
Enhancement Of Gas-Liquid And Particle-Liquid Mass Transfer In Bubble Columns And Three-Phase Fluidized Beds, Anand Prakash
Digitized Theses
Mass transfer is an important consideration in the design of multiphase contactors. While gas-liquid mass transfer is important for two-phase contactors, both gas-liquid and liquid-solid mass transfer need to be considered for the design three-phase contactors. Many industrial processes such as coal liquefaction, petrochemical, waste water treatment or fermentation processes involve gas absorption in a liquid with or without the presence of inert or catalyst solid particles. When mass transfer is the rate limiting step, the overall rate can be improved by enhancing the rate of mass transfer. This study investigated gas-liquid and liquid-solid mass transfer in bubble columns and …
Modelling Catalytic Cracking In A Novel Riser Simulator (Volumes I And Ii), Daniel William Kraemer
Modelling Catalytic Cracking In A Novel Riser Simulator (Volumes I And Ii), Daniel William Kraemer
Digitized Theses
A 45 mL bench-scale internal recycle reactor, named a 'Riser Simulator' was used to study the kinetics of catalytic cracking. This reaction system is well suited for riser cracking reactions since it can be operated at reaction times as low as 3 seconds and can simulate the reaction regime of a riser. The reactor operates in a batch mode with a gas recirculation in the upward direction through the central catalyst zone to maintain a well fluidized bed.;Experimental runs performed in the unit included the cracking of two commercial feedstocks and three mixtures of pure light oil compounds with two …