共查询到18条相似文献,搜索用时 312 毫秒
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对催化精馏过程模拟的平衡级模型、非平衡级模型和非平衡池模型3个常用的稳态模型及其求解方法进行了综述,并简要分析了各模型和求解方法的优缺点,讨论了催化精馏过程模拟的稳态模型及其求解方法未来的发展方向。 相似文献
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反应精馏及其研究进展 总被引:13,自引:0,他引:13
反应精馏是化学反应和精馏分离耦合在一个设备中进行的操作。简述了反应精馏技术,介绍了稳态均相反应精馏过程模拟的平衡级模型、非平衡级模型、非平衡池模型、统计模型、微分模型以及相应的计算方法,并指出了今后的研究方向。 相似文献
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基于非平衡级和拟均相假设,建立了乳酸提纯反应精馏新工艺实验装置的动态机理模型.通过改进的数值计算方法提高了模型的求解效率,设计并实现了包含物性估算系统的模型仿真平台,以促进新工艺的工业化应用.利用仿真平台对新工艺装置进行了动态特性分析,在此基础上设计了两种单端质量控制方案:直接物料平衡和间接物料平衡方案.在不同类型和幅度的过程扰动下,分析比较了两种控制方案的调节性能.结果表明直接物料平衡方案控制品质优于间接物料平衡方案,可在不同扰动情况下满足过程的产品质量和转化率的联合控制要求.非平衡级动态机理模型能够反映反应精馏过程的动态特性,分析发现反应精馏过程有着独特的过程特性,基于机理模型的仿真平台是分析反应精馏特性的有效工具. 相似文献
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引 言近年来 ,在传统催化精馏的基础上提出了一种悬浮床催化精馏的新技术[1,2 ] .悬浮床催化精馏不仅继承了传统催化精馏具有的节省投资、提高反应转化率和选择性、操作条件易控制等优点 ,而且克服了催化剂元件的预制、装卸、更换比较麻烦的缺点 .因此 ,悬浮床催化精馏被认为是一种具有研究价值和应用前景的新技术 ,将其应用于负载杂多酸催化的苯与十二烯的烷基化反应已经过小试验证[2 ] .目前 ,催化精馏的模拟研究大都采用非平衡级数学模型[3~ 5] .因为平衡级模型与工业实际精馏塔的运行结果常常不甚相符 ,已经不能准确模拟催化精馏因反… 相似文献
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催化精馏法合成乙二醇单甲醚的模拟研究 总被引:2,自引:0,他引:2
提出以环氧乙烷和甲醇为原料,应用催化精馏技术合成乙二醇单甲醚的工艺方法.采用基于非平衡级模型的模拟方法,考察关键操作参数对目的产物选择性和收率的影响,并得到优化的操作条件为400 kPa,377 K,甲醇和环氧乙烷流量均为0.078 mol/s,再沸比9,反应段高度1.8 m,提馏段高度3.2 m.建立了中试规模的催化精馏塔对模拟结果进行了验证.结果表明,采用催化精馏法合成乙二醇单甲醚,在优化条件下乙二醇单甲醚收率达到93%以上.实验结果与模拟结果吻合良好,表明模拟方法可靠. 相似文献
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乳酸提纯反应精馏新工艺非平衡级稳态模拟 总被引:2,自引:2,他引:0
Purification of lactic acid by reactive distillation (RD) is a novel technology which has many excellent characteristics compared with traditional technologies. This paper presented a non-equilibrium model for lactic acid purification RD pilot column. An Improved Separation Efficiency Function (ISEF) was proposed based on de-coupling and pseudo-homogenous assumptions, which greatly improved the solving efficiency and made this model suitable for practical application. Simulation results were consistent with the experiments in different conditions, and the simulation results outperformed the simulator ASPEN PLUS in which the equilibrium stage assumptions were adopted. The static characteristics of the pilot setup were also investigated. The analysis result could help to accelerate the commercialization of the lactic acid purification RD technology. 相似文献
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催化蒸馏合成乙二醇乙醚的过程模拟 总被引:17,自引:1,他引:17
修正了非平衡级速率模型,使之能适用于催化蒸馏过程的模拟.此催化蒸馏塔的精馏段和提馏段为一般的填料塔结构,而反应段为CR&L公司提出的特定结构的催化剂填充层.采用专门测定此特殊结构的催化剂填充层的气膜和液膜传质系数关联式来计算反应段中的传质速率,用Onda的关联式计算精馏段和提馏段填充层中的传质速率.结合在NKC-01分子筛催化剂上环氧乙烷与乙醇反应的动力学方程式,采用Newton-Raphson技术完成了催化蒸馏合成乙二醇乙醚过程的模拟,结果是令人满意的. 相似文献
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Feng WANG Ning ZHAO Junping LI Fukui XIAO Wei WEI Yuhan SUN 《Frontiers of Chemical Engineering in China》2008,2(4):379-384
A new improved tri-diagonal method was developed for the non-equilibrium stage model of the catalytic distillation by coupling
consumptive reaction coefficient. The reactions in the distillation column were divided into generative reaction and consumptive
reaction. The non-equilibrium stage model was introduced for the catalytic distillation process of the dimethyl carbonate
(DMC) synthesis by urea methanolysis over solid based catalyst, and the improved tri-diagonal method was used to solve the
model equations. Comparison of predicted results with experiment data shows that the mean relative error of the yield of DMC
was 3.78% under different conditions such as different operating pressures and reaction temperatures. The improved tri-diagonal
matrix method could avoid the negative values of the liquid compositions during the calculations and restrain the fluctuation
of compositions by slowing down the variations of the values in the iteration. The modeling results show that the improved
tri-diagonal method was appropriate for system containing a wide range of boiling point components and a different rate of
reactions.
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Translated from Petrochemical Technology, 2007, 36(11): 1128–1133 [译自: 石油化工] 相似文献
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Jie He Baoyun Xu Weijiang Zhang Cuifang Zhou Xuejia Chen 《Chemical Engineering and Processing: Process Intensification》2010
The production of n-butyl acetate by transesterification of methyl acetate with n-butanol, catalyzed by acidic ion-exchange resin NKC-9, was experimentally investigated in a homemade catalytic distillation column with a diameter of 80 mm. A non-equilibrium stage model for describing the catalytic distillation process was established and solved with Newton-Homotopy method. The effect of feeding mode, reflux ratio, material molar ratio and number of reactive sections on the conversion of methyl acetate was investigated. The experimental results agree well with those obtained by the theoretical simulation calculations, indicating the accuracy and reliability of the non-equilibrium model. It can be concluded that the non-equilibrium model established in this paper can provide theoretical guidance for the further process design and optimization. 相似文献
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针对催化蒸馏法干气制乙苯过程,建立非平衡级模型,并进行了计算机模拟.结果表明,非平衡级模型可用于模拟催化蒸馏法干气制乙苯过程,模拟结果与试验值吻合较好.以模拟结果为依据,考察了各工艺条件的影响,并提出了催化蒸馏法干气制乙苯过程适宜的工艺条件. 相似文献
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This paper presents an improved three-dimensional non-equilibrium mixing pool model.It is a simplified form of the original model and is more practical for applications.The simulation re-sults show that the industrial scale distillation tray columns can be described closely by the improvedmodel.The effects of model parameters,such as the number of mixing pools,the point efficiencyand flow pattern,on separation are analyzed quantitatively. 相似文献