Numerical Analysis for Performances of Membrane Reactor to Design A Combined Reaction System with Simultaneously Separation

膜反应器性能数值分析设计同时分离的组合反应系统

• 批准号: 11650800
• 负责人: FUKUHARA Choji
• 金额: $ 2.24万
• 依托单位: Hachinohe Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650800/
• 关键词: Membrane Reactor; Dehydrogenation of Ethylbenzene; Simulation; Reaction and Separation; Palladium Membrane; Nickel-Type Membrane; Hydrogen Permeability; 水素の選択的透過; パラジウム分散膜

A membrane reactor is a reaction system that provides higher productivity and separation cost reduction in the chemical reaction processes. Analyses of membrane reactors based on numerical simulation were mainly made using single-dimension models, which cannot express radial heat and concentration gradients. However, consideration of mass transfer and heat transfer in the radial direction is indispensable in reactions generating highly reaction heat in a membrane reactor, or in precise analysis of reactors.In this research, we developed a numerical simulator, taking into account the mass transfer and heat transfer in the axial and radial directions, to make an accurate analysis of temperature distribution and hydrogen permeation characteristics in a membrane reactor for ethylbenzene dehydrogenation.The results obtained in this research can be summarized as follows :The temperature distribution in the membrane reactor, using contour profile lines against the cross section, indicates a considerably rapid change in the temperature distribution in the reactor, because of dehydrogenation of ethylbenzene being a relatively large endothermic reaction. The result suggests that the hydrogen permeability for the membrane vary with the distance from the inlet.The case assuming the isothermal condition has a higher conversion than the one considering the temperature gradient The former expected value is relatively high and the difference between the values is gradually increased as the feed gas rate is increased. The results clearly demonstrate that consideration of the temperature distributions of the axial and radial directions in the reactor lead to an accurate expectation of the performance for membrane reactor with a highly reaction heat. The accuracy is considered to increase as the radius of the reactor tube is increased, and/or as the amount of thermal energy for the reaction is increased.

膜反应器是一种反应系统，可提供更高的生产率和化学反应过程中的分离成本降低。基于数值模拟的膜反应器的分析主要是使用单量度模型进行的，该模型无法表达径向热和浓度梯度。然而，考虑在膜反应器中产生高度反应热的反应或反应器的精确分析中，考虑到高度反应热是必不可少的。在这项研究中，我们考虑了轴向和辐射方向的质量传递和热传递，以对温度分布和氢化反应器进行准确的分析。在这项研究中获得的可以总结如下：使用针对横截面的轮廓轮廓线的膜反应器中的温度分布表明反应器中温度分布的变化很快，因为乙烯的脱氢作用是相对较大的吸热反应。结果表明，膜的氢通透性随距入口距离的距离而变化。假设等温条件的转化率高于考虑到温度梯度的转化率，以前的期望值相对较高，并且随着进料气速率的增加，该值之间的差异逐渐增加。结果清楚地表明，对反应器中轴向和径向方向的温度分布的考虑会导致对具有高反应热的膜反应器的性能的准确期望。随着反应器管的半径增加和/或反应的热能量增加，该精度被认为会增加。

项目成果

福原: "高伝熱性プレート型触媒反応システム"触媒. 42(1). 19-24 (2000)

福原：“高传热板式催化反应系统”，催化剂42(1)。

五十嵐: "マクロ特殊反応場の構築"化学工学. 63(4). 197-200 (1999)

五十岚：“宏观特殊反应场的构建”化学工程197-200（1999）。