带侧反应器反应精馏塔的苯氯化与氯苯精馏过程模拟研究

引入独立反应量概念建立了多侧线进料的带侧反应器的反应精馏塔平衡级模型,并运用Newton-Raphson法解该模型的MESH方程. 将该方法应用于苯氯化反应精馏过程模拟,模型具有很好的收敛效果. 在给定的模拟条件下,Cl2进料量为8 kmol/h时,产品氯化苯纯度达96.8%,最佳苯进料量为7.77 kmol/h. 模拟结果可用于指导苯氯化生产.     

复杂精馏构型的可控性研究

热泵辅助反应分隔壁精馏塔(HP-RDWC)将热泵技术与反应分隔壁塔相结合,集成了两种过程强化技术的优势.但由于HP-RDWC具有强耦合性和强非线性等特点,其控制方案的设计一直是研究重点之一.以HP-RDWC生产乙酸甲酯过程为研究案例,基于稳态过程的可控性指数筛选出兼具稳定性和鲁棒性的基础控制结构,为HP-RDWC的工业应用提供理论基础.     

Distillation with Chemical Reaction and Apparatus Selection

Abstract

Reactive distillation was studied practically and theoretically for the esterification of succinic anhydride with methanol to produce in a first step monomethyl succinate and in a second one dimethyl succinate and water. It was shown that simulations using the ASPEN PLUS rigorous distillation model RADFRAC corresponds with experimental data quite well. With this fundament further calculations were performed simulating several kinds of reactive and distillation equipment. On basis of this, an apparatus selection is made related on energy consumption and relative conversion. Key parameters, as reaction velocity for the reaction term and the relative volatility (α from 1.2 to 14), affect markedly the selection of the apparatus of choice. The reaction column is the apparatus of choice for fast reactions and high volatilities considering the energy input. For low relative volatilities the choice is between the reaction column or the reactor with evaporation, depending on whether operating costs or investment costs are taken into account.     

采用蒸馏和熔融结晶联合装置来提高MPBA的含量

熔融结晶技术已被广泛地运用了有机化工品的提纯,作为一种高效,低能耗,低污染的分离技术,其应用的领域在不断扩大,本文简述了通过蒸馏与熔融结晶技术的结合来提高ＭＰＢＡ（间苯氧基苯甲醛）含量的原理,工艺流程,装置性能及运行情况。     

乙烯淤浆聚合反应器的模型与模拟

建立了乙烯淤浆聚合反应器的多相全混流模型,描述了包括乙烯共聚合反应动力学、气液和液固传质、反应器传热在内的物理化学过程。通过模拟计算分析了聚合过程的控制步骤,得到了反应器生产能力与有关操作变量之间的关系,对某工业反应器的模拟结果表明计算值与生产数据具有很好的一致性。     

汽液液三相精馏全塔效率模型及分析

在探讨汽液两相精馏塔板效率模型及影响因素的基础上,在Ｏｌｄｅｒｓｈａｗ精馏塔内,对影响汽液液三相 精馏全塔效率的各种因素进行了深入研究,建立了基于泡沫工况下的汽液液三相精馏全塔效率模型,通过对实 测数据的关联,获得了上述模型参数。     

运用HYSYS对背包式反应精馏过程控制的仿真

利用化工模拟软件HYSYS对背包式反应与精馏苯氯化过程分别进行稳态和动态模拟,并在动态模拟的基础上,分析比较了3种不同控制策略在进料扰动情况下对苯氯化过程的控制效果.     

Gas Absorption with Chemical Reaction and Desorption in a Foam-bed Reactor

A general model of a foam-bed reactor involving simultaneous gas absorption, reaction, and desorption has been developed. The model considers all coupled processes in the reactor. The reactive gas absorption and desorption in the foam section have been simulated via analysis of a single foam film surrounded by limited gas pockets. The model includes a sub-model to find out concentration profiles inside the surface element. A modular approach has been used to simulate a single foam film to obtain transient concentration profiles of the gas-phase reactant A and product P. Effects of various kinetic, physicochemical, operating, and system parameters like reaction velocity, diffusion coefficient, solubility, contact time, and holdup on fractional absorption and desorption of gas are studied.     

甲醇装置精馏系统侧抽量高的原因分析及对策

针对中海化学80万t/a甲醇装置精馏系统侧抽量的采出一直高于设计量原因进行分析,并认真总结研究,提出解决办法。对降低侧抽量进行实施,找到降本增效的方法,并分析其效果。     

A New Configuration for a Fully Thermally Coupled Distillation Column with a Postfractionator and Separated Main Columns

The installation of a postfractionator into a fully thermally coupled distillation column (FTCDC) significantly improves the distillation column efficiency, but the column operation is more difficult than for the original FTCDC. A modified configuration of the postfractionator FTCDC having sectionalized main columns is proposed for operational improvement, and its performance is examined through the HYSYS simulation of a BTX fractionation process. By setting different pressures for the various sections of the main columns, the proposed distillation column facilitates easy vapor transfer between the sections without the need to utilize compressors. The outcome of a dynamic simulation on the column shows that the control of the column pressure is easily undertaken and the specifications of three products in the BTX process can be separately controlled to facilitate ease of column operation.     

用反应器和精馏塔外耦合方法合成环己烷的研究

改进了固定床和反应精馏合成环已烷的方法，提出了反应器与精馏塔外耦合的新方法。对其进行了理论分析，并通过间歇和连续实验加以验证。结果表明通过新方法不仅能获得高纯度的环已烷，而且克服了传统方法的不足，显示出具有流程短、热量直接利用高、操作稳定性好等特点。该方法尤其适应于强放热及受平衡控制的反应，对于反应物与产物形成共沸物的共沸体系也极具应用前景。     

反应精馏过程模拟优化的研究进展

反应精馏过程的数学模拟是反应精馏塔设计、放大、控制的基础。对反应精馏过程模拟模型、求解方法以及优化的研究进展进行了综述。     

Direct Synthesis of 1-Butanol from Ethanol in a Plug Flow Reactor: Reactor and Reaction Kinetics Modeling

Bio-ethanol is well known for its use as a gasoline additive. However, it can be blended in low portions to traditional gasoline although it has a corrosive nature. By taking advantage of modern continuous reactor technology and heterogeneous alumina catalysts, ethanol can be upgraded to 1-butanol in fixed beds. Butanol has more feasible properties as fuel component in comparison to ethanol. Mathematical modeling of reaction kinetics revealed a simple kinetic model could be used to describe the complex reaction process on a Cu/alumina catalyst. The reaction kinetics model is based on five parallel reactions in which ethanol reacts to 1-butanol, acetealdehyde, ethyl acetate, diethyl ether and diethoxyethane, respectively.     

Direct Synthesis of 1-Butanol from Ethanol in a Plug Flow Reactor: Reactor and Reaction Kinetics Modeling

Bio-ethanol is well known for its use as a gasoline additive. However, it can be blended in low portions to traditional gasoline although it has a corrosive nature. By taking advantage of modern continuous reactor technology and heterogeneous alumina catalysts, ethanol can be upgraded to 1-butanol in fixed beds. Butanol has more feasible properties as fuel component in comparison to ethanol. Mathematical modeling of reaction kinetics revealed a simple kinetic model could be used to describe the complex reaction process on a Cu/alumina catalyst. The reaction kinetics model is based on five parallel reactions in which ethanol reacts to 1-butanol, acetealdehyde, ethyl acetate, diethyl ether and diethoxyethane, respectively.

     

低变催化剂的副反应

分析了低温变换催化剂在生产过程中发生副反应的原因。提出降低副反应的措施。