Effect of Pulsing on Reaction Outcome in a Gas-Liquid Catalytic Packed-Bed Reactor
نویسندگان
چکیده
There has been continuous interest and fascination with the fluid dynamics of trickle-beds (i.e., cocurrent gas-liquid packed-bed reactors) at least since Weekman and Myers (1964) first proposed a regime map for their operation. Consistent with other flow regime maps before (Baker, 1954; for gas-liquid pipe flow) and since (e.g., Mandhane et al., 1974; for pipe flow), visual observations were used to identify the existence of qualitatively different regimes of operation. Trickling was characterized, much as the name implies, by gentle to moderate bubbling and liquid fluctuations. At more severe flow conditions, strong, organized, traveling, disturbances of high liquid fraction, termed pulses are observed. Most industrially important reactions are carried out in one of these two flow regimes. Weekman and Myers (1964) noticed that pulses took some distance to appear and so defined the existence of the pulse regime when pulsing was observed at a particular point. Chou et al. (1977) also adopted this criterion which makes sense from a reaction point of view. Pulsing affects the heat and mass transfer rates, and thus reaction rates, hence it is necessary to verify its existence in the reaction zone.
منابع مشابه
Improved numerical simulation of the low temperature Fischer-Tropsch synthesis in a trickle bed reactor
Abstract Gas to liquid (GTL) process involves heterogeneous catalytic chemical reactions that convert synthesis gas to hydrocarbons and water vapor. A three phase reactor, called Low temperature Fischer-Tropsch (LTFT) is commonly applied for GTL process. In this reactor the gaseous phase includes the synthesis gas, light hydrocarbons and water vapor, the liquid phase is a mixture of the h...
متن کاملCFD Simulation of Porosity and Particle Diameter Influence on Wall-to-Bed Heat Transfer in Trickle Bed Reactors
Wall-to-bed (or wall-to-fluid) heat transfer issues in trickle bed reactors (TBR) has an important impact on operation and efficiency in this category of reactors. In this study, the hydrodynamic and thermal behavior of trickle bed reactors was simulated by means of computational fluid dynamics (CFD) technique. The multiphase behavior of trickle bed reactor was studied by the implementation of ...
متن کاملCFD Simulation of Dimethyl Ether Synthesis from Methanol in an Adiabatic Fixed-bed Reactor
A computational fluid dynamic (CFD) study of methanol (MeOH) to dimethyl ether (DME) process in an adiabatic fixed-bed reactor is presented. One of the methods of industrial DME production is the catalytic dehydration of MeOH. Kinetic model was derived based on Bercic rate. The parameters of this equation for a specific catalyst were tuned by solving a one-dimensional homogenous model using MAT...
متن کاملModelling of Three Phase Catalytic Upflow Reactor: a Significant Chemical Determination of Liquid-solid and Gas-liquid
INTRODUCTION Muhiphase reactors with fixed beds of catalyst particles contacted by either cocurrent downflow (Trickle-Bed Reactors) or cocurrent upflow (Packed Bed Column) of gas and liquid, are widely used in petroleum, petrochemical and chemical industries, environmental, biochemical and electrochemical processing, etc In many cases the gaseous reactant is sparingly soluble in the liquid phas...
متن کامل