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Study on the Modeling of the Reactor for Ethanol Dehydration to Ethylene

Author: ZhouMinYan
Tutor: ChenXiaoChun
School: Beijing University of Chemical Technology
Course: Chemical processes
Keywords: Ethylene Ethanol Fixed - bed reactor One-dimensional model Two-dimensional model Modeling
CLC: TQ221.211
Type: Master's thesis
Year: 2008
Downloads: 297
Quote: 0
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Abstract


Oil resources crisis will have tremendous impact on petroleum-based raw materials ethylene industrial the biomass fermentation ethanol can be used as raw materials for ethylene production , and has a renewable , non-renewable oil to the dehydration of ethanol to ethylene technology roadmap the development has created opportunities. Ethanol to ethylene technology roadmap has been widespread concern at home and abroad . In this paper, a heterogeneous catalytic fixed bed tube integral reactor , experimental study on the kinetics of catalytic dehydration of ethanol to ethylene activated alumina , the macro - dynamics model , the main reactions and side effects of kinetic equations do not : - r B = 1.065 × 10 3 e -47.116 10 3 / RT ( 1-x) 1.23 ,-r c = 10.158 × e -67.598 × 10 3 / RT (1-x) 0.8473 . The establishment of a fixed bed catalytic reactor is one-dimensional and two-dimensional quasi - homogeneous model to calculate the relevant physical parameters and reactor model parameters , orthogonal collocation method , the two-dimensional partial differential equations are converted into ordinary differential equations , and then use the Runge - Kutta method to solve it. Simulation results show that : the ethanol dehydration of ethylene is an endothermic reaction , as the reaction proceeds , the reaction tube axial temperature slightly lower , but the temperature difference will not exceed 4 ° C ; the radial temperature difference is small , substantially at 5 ° C . Ether byproduct is very small , the mole fraction of no more than 0.4% at 410 ℃ . A two - dimensional simulation results with a wiki present consistent , on the concentration gradient in the radial direction of the catalytic bed and temperature gradient is very small, and therefore can be basically a one-dimensional model to simulate this reactor .

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic hydrocarbons > Unsaturated lipid hydrocarbon > Monoolefins > Ethylene
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