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Electrostatic fluidized bed deposition of a high performance polymeric powder on metallic substrates M BarlettaT V Tagliaferri Department of Mechanical Engineering University of Rome bTor VergataQ Via del Politecnico 1 00133 Rome Italy
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perforated or porous plate In the case of fluidized bed coating air is passed through a bed of polymer particles When the frictional force acting on the particles or pressure drop of the flowing air through the bed equals or exceeds the weight of the bed the powder particles become suspended and the bed exhibits liquid-like behavior As
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Modeling of LLDPE production in fluidized bed reactors has recently received considerable attention Several research efforts have been conducted on modeling of the fluidized bed reactors for LLDPE production and particle growth models in the reactor These attempts have led to a more realistic understanding of the reactor behavior as
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Fluidized beds are seldom used solely as powder mixing devices but the degree to which mixing and segregation occur in them is often crucial to their successful operation Several examples come to mind: 1 In a fluidized bed combustor the rapid dispersion of injected combustible matter amongst the inert ash particles (the micro-mixing) affects crucially the combustion efficiency
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Keywords: Fluidized bed reactor Mathematical model Ethylene conversion Bed height Catalyst feed rate Background The fluidized bed reactor has a unique physical design with gas and polymer particles flowing in opposite directions It consists of metallic catalyst particles that are fluidized by the flow of ethylene gas and catalyst
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The absolute and differential pressure fluctuations in gas-solid fluidized beds have been analyzed by statistical and deterministic chaos methods Linear low-density polyethylene (LLDPE) particles with a mean diameter of 1 23 mm were used as a fluidizing material The statistical methods are composed of the mean standard deviation skewness and kurtosis and the
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Rector: With fluid bed coating the part has to be preheated immersed in the coating and then flowed out Long: Electrostatically assisted fluidized bed coating does not dip the part into the powder it generates a cloud of charged particles (much like a conventional electrostatic gun) through which a heated or an unheated part passes It generally applies a thin coat vs the
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Operation of the gas reactor with a fluidized bed can be adjusted to achieve the desired melt index and density of the polymer at optimum performance To avoid creating conditions that can lead to the formation of lumps or deposits or in the worst case unstable fluidized bed which is destroyed or causes fusion of the polymer particles
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The model was used to understand influence of operating parameters on polymer properties and particle size distribution Comparison is also made between the two operating modes (normal and super-condensed) The developed framework is useful for simulating multi-monomer multi-site Ziegler-Natta type olefin fluidized bed polymerization reactors
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The fluidized‐bed model developed in this work is based on a steady‐state model incorporating interactions between separate bubble emulsion gas phase and emulsion solid polymer particles The model is capable not only of computing temperature and concentration gradients for bubble and emulsion phases calculating polymer particle mean
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Markets globally are demanding more high quality and clean polymers while polymer resin producers are looking to cut downtime which leads to production losses and represents significant costs Valves have a critical role in ensuring that the fluidized-bed type of gas-phase polymerization is stable flexible and controlled Any valve leakage poses both an
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The fluidized‐bed model developed in this work is based on a steady‐state model incorporating interactions between separate bubble emulsion gas phase and emulsion solid polymer particles The model is capable not only of computing temperature and concentration gradients for bubble and emulsion phases calculating polymer particle mean
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nanoparticles via plasma enhanced chemical vapor deposition (PECVD) and coating of polymer host particles in a fluidized bed in a single process The influence of the treatment time on the packing density and flow behavior of the powders is investigated Test specimen are produced to assess the influence of the treatment on the
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CHEMICAL ENGINEERING LABORATORY 3 CE 427 PACKED AND FLUIDIZED BED EXPERIMENT INTRODUCTION Packed and fluidized beds play a major role in many chemical engineering processes Packed-bed situations include such diverse processes as filtration wastewater treatment and the flow of crude oil in a petroleum reservoir In these cases the
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