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反应精馏是为增强反应与精馏效果而将两种单元操作进行耦合的多功能新技术。因既有化学反应又有精馏过程,反应精馏过程需考虑气液相平衡、气液质量传递、催化剂内扩散(非均相反应精馏)以及动力学等因素的相互作用,导致该过程存在定态多重性、动力学复杂性。文章系统地综述了近年来国内外科研工作者对反应精馏实验和理论的研究进展,分析了反应精馏技术工业应用中存在的关键问题,并对未来的发展方向进行了展望。 相似文献
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The steady-state simulation of reactive distillation columns using the conventional Naphtali-Sandholm (NS) method is studied. Results for methyl acetate and MTBE columns show that the method effectively solves the highly non-linear MEH equations. In the MTBE system, three distinct steady states are obtained as the Newton step factor is decreased from high to low values. The versatility of the method in handling different column specifications and its application for preliminary control studies is also demonstrated. A novel feature of the work is the inclusion of reaction conversion as a possible column specification. The specification of reaction conversion and product purity provides a direct means for obtaining operating conditions for high purity and high conversion column operation. 相似文献
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反应精馏技术的研究现状及应用进展 总被引:1,自引:0,他引:1
反应精馏是化学反应和精馏过程耦合为一体的单元操作,已成为当今的重要研究领域。本文对反应精馏技术的研究现状及其应用进行了综述,介绍了反应精馏塔及催化剂,对催化剂床中传质及流体力学特征,数学模型和反应精馏塔设计方程进行了总结;同时介绍了反应精馏技术的应用现状及其可能的应用领域. 相似文献
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反应精馏技术的研究现状及应用 总被引:5,自引:0,他引:5
对反应精馏技术的研究现状及其应用进行了综述,介绍了反应精馏塔及催化剂,对催化剂床中传质及流体力学特征,数学模型和反应精馏塔设计方程进行了总结;同时介绍了反应精馏技术的应用现状及其可能的应用领域。 相似文献
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反应精馏过程中的场协同分析 总被引:1,自引:0,他引:1
应用唯象理论,分析了反应精馏过程中各种场(如温度场、浓度场、化学势场等)之间的协同关系,以及同一场内不同分量之间的协同关系。提出了在多场协同条件下质量通量和热量通量的唯象表达式以及相应的传质和传热系数。从而揭示了该过程中传质、传热以及化学反应之间的相互影响规律,为强化该过程提供了理论依据。 相似文献
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反应精馏技术的研究现状及其应用 总被引:20,自引:0,他引:20
本文对反应精馏技术的研究现状及其应用进行了综述。介绍了反应精馏塔及催化剂,对催化剂床中传质及流体力学特性、数学模型和反应精馏塔设计方程进行了总结;同时介绍了反庆精馏技术的应用现状及其可能的应用领域。 相似文献
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Oren M. Becker Marvin Silverberg Avinoam Ben-Shaul 《Israel journal of chemistry》1990,30(1-2):179-188
The kinetics of surface chemical reactions depend critically on the lateral distribution of the adsorbed reactants. In some cases, the adsorbates are aggregated into islands and the rate of reaction is strongly influenced by the structural (sizes and shapes) and energetic (lateral interaction potentials) characteristics of the aggregated overlayer. Adsorbate aggregation or segregation on surfaces may be induced by a variety of mechanisms, three important types of which are briefly discussed here. The first process is driven by strong lateral interactions between the adsorbed particles, which favor their organization in an ordered two-dimensional phase, but because of kinetic constraints the system only reaches a long-lived metastable state characterized by finite islands with highly ramified edges. A somewhat more complex aggregation-segregation process, in a system comprised of two interacting adsorbate species, is also described, and the consequences with respect to surface reaction kinetics are demonstrated. The second aggregation process reflects (Eden-type) island formation during adsorption of molecules from the gas phase. More specifically, these islands result from the so-called (extrinsic) precursor-mediated chemisorption mechanism. Finally, we discuss the segregation of adsorbed reactants induced by the bimolecular annihilation reaction A + B → 0, under steady-state conditions. Unlike in the first example, this segregation process takes place even in the absence of adsorbate interactions (except for the reactive A-B interaction) and is most pronounced in the absence of particle diffusion. 相似文献
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文章采用Aspen Plus对反应精馏法生产醋酸丁酯过程进行稳态模拟。对塔板数、进料位置及进料比进行了优化,得到了精馏塔理论板上的温度、汽(液)相流量组成分布和再沸器热负荷。结果表明进料位置和进料比对年总成本TAC影响很大。该计算对反应精馏法合成醋酸丁酯工艺的设计和操作具有实际意义。 相似文献
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丁烯异构反应精馏动态模型和开车过程模拟 总被引:2,自引:0,他引:2
建立了以严格的相平衡计算为基础的2-丁烯反应精馏制1-丁烯的过程动态模型,其中各组分的逸度和活度用RKS方法和Scatchard-Hildebrand方程计算.在模拟计算时用差分方法求解塔板的能量衡算方程,用可变阶数Numerical Differentiation Formulas(NDFs)方法求解全塔的组分物料衡算方程.比较了开车时不同的阀门线性调节时间对过程变量的影响.结果表明,所建立的模型能很好地反映反应精馏过程的动态特性,开车时可先进行全回流操作,之后直接将进出料阀门瞬间开至设定值. 相似文献