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The Mathematical Simulation of an Annual Output of One Hundred Thousand Tons of Dimethyl Oxalate with an Annual Output of Fifty Thousand Tons Ethylene Glycol Shell and Tube Type Reactor

Author: WangYu
Tutor: FangDingYe；XiaoZhenPing
School: East China University of Science and Technology
Course: Chemical Engineering
Keywords: glycol Methyl nitrite dimethyl oxalate Shell and tube type reactor reactor simulation
CLC: TQ223.162
Type: Master's thesis
Year: 2012
Downloads: 170
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Abstract


As China’s coal resources are relatively abundant, from coal to generate synthesis gas, synthesis gas to generate ethylene glycol has become the most promising industrial process route in our country.Firstly,the CO gas-phase catalyticed coupling of dimethyl oxalate,then,the dimethyl oxalate hydrogenated to generate ethylene glycol.In this paper,the mathematical simulation of the two shell and tube type reactor of catalytic coupling of CO gas generated dimethyl oxalate and hydrogenation of ethylene glycol dimethyl oxalate have been studied.And obtained the distribution of the bed temperature difference and concentration difference.Then,simulated the effect of the reaction operating conditions on the results.Firstly,established one-dimensional and two-dimensional mathematical model of the CO gas-phase catalytic coupling reactions to generate dimethyl oxalate. In a typical operating conditions, the initial temperature is 403K, the initial pressure is 0.5MPa, mixed gas flow is 98055Nm3/h.The results showed that the conversion rate of methyl nitrite is about 0.57. And the bed temperature decreases along the radial direction.But along the axis,the bed temperature increases at the beginning,then to flatten,finnally it decreased.And the annual production of dimethyl oxalate is about one hundred thousand tons per year. And then studied the effect of operating conditions(such as initial temperature, initial pressure, catalyst particle size and gas flow) on the results of this reaction. The results show that the radial bed temperature and the concentration difference have less change compared to one-dimensional model results.Secondly, established one-dimensional mathematical model of the dimethyl oxalate hydrogenated to generate ethylene glycol. In a typical operating conditions, the initial temperature is 463K, the initial pressure is 2.5MPa, the liquid space velocity is 0.55 t/ (m3cat.h),the mixed gas flow is 142927Nm3/h and the hydrogen ester is 60. The results show that the conversion of dimethyl oxalate reached 0.988, the selectivity of ethylene glycol reached 0.938,The annual production of ethylene glycol is about 49,000 tons.And the bed temperature gradually increased along the axial. And then studied the effect of operating conditions(such as initial temperature, initial pressure, the shell temperature, catalyst particle size and gas flow) on the results of this reaction.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic alcohols (alcohols, hydroxy compounds) and its derivatives > Aliphatic alcohol > Polyols > Diols
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