悬浮床催化精馏合成支链烷基苯的模拟

Suspension catalytic distillation (SCD) has been developed recently as an innovative technology in catalytic distillation. In this paper, a brief introduction to SCD is given and an equilibrium stage (EQ) model is developed to simulate this new process for synthesis of linear alkylbenzene (LAB) from benzene and 1-dodecene.Since non-ideality of this reaction system is not strong, EQ model developed could be applied to it successfully.Simulation results agree well with experimental data, and indicate some characteristics of SCD process as an advanced technology for the production of LAB: 100% conversion of olefins, low temperature (90-100℃) and low benzene/olefin mole ratio.     

在VPO催化剂上丁烷选择氧化的质谱研究

The selective oxidation of n-butane to maleic anhydride(MA) on a vanadium-phosphorus oxide (VPO) catalyst was studied using on-line gas-chromatography combined with mass spectrometry(GC-MS) and transient response technique.The reaction intermediates,butene and furan,were found in the reaction effuent under near industrial feed condition (3% butane 15% O2),while dihydrofuran was detected at high butane concentration (12% butane,5%O2).Some intermediates of MA decomposition were also identified.Detection of these intermediates shows that the vanadium phosphorus oxides are able to dehydrogenate butane to butene,and butene further to form MA.Based on these observations,a modified scheme of reaction network is proposed.The transient experiments show that butane in the gas phase may directly react with oxygen both on the surface and from the metal oxide lattice,without a proceeding adsorption step.Gas phase oxygen can be adsorbed and transformed to surface lattice oxygen but it can not participate in selective oxidation.Adsorbed oxygen leads to deep oxidation,while lattice oxygen leads to selective oxidation.     

乙烯环氧化反应的动态特性与反应器的动态操作(Ⅰ)——基元过程序列结构与动力学

利用动态响应方法,对乙烯在银催化剂上环氧化反应的基元过程序列结构和动力学进行了系统的实验和模型化研究,为从理论上考察这一反应体系在浓度强制振荡条件下的时间平均性能与基元过程动力学的相互关系,为建立适当的模型来描述浓度强制振荡过程提供了必要的条件.     

BαCO3/Lα2O3催化剂低温甲烷氧化偶联及床层热点效应

以BαCO3和不同的镧化合物作为催化剂组分，分别采用干混法和湿混法制备了BαCO3质量含量为2．5％-15％的BαCO3/Lα2O3催化剂，在微型固定床反应器上评价了催化剂的甲烷氧化偶联反应性能，考察了反应条件对催化剂性能的影响，以及催化剂床层中的热点效应，采用XRD和TPR对催化剂的结构和性能进行了表征。结果表明，不同方法制备的BαCO3/Lα2O3催化剂在较低炉温的条件下都具有好的甲烷氧化偶联反应性能，其中湿混法制备的10％BαCO3/Lα2O3催化剂性能最好，在烷氧比为2，反应气体空速为36000mL·g^-1·h^-1的条件下，反应炉温在125℃时甲烷氧化偶联反应仍能平稳进行。存在于催化剂床层的热点是维持甲烷氧化偶联反应的关键。不同方法制备的BαCO3/Lα2O3催化剂其物相和氧化还原性能也有一定的差别。     

铜基催化剂上甲醇合成的动态反应动力学

Adsorption, surface reaction and process dynamics on the surface of a commercial copper-based cata-lyst for methanol synthesis from CO/CO2/H2 were systematically studied by means of temperature programmed desorption (TPD), temperature programmed surface reaction (TPSR), in-situ Fourier transform-inferred spectroecopy(FTIR) and stimulus-response techniques. As a part of results, an elementary step sequence was suggested and a group of ordinary differential equations (ODEs) for describing transient conversations relevant to all species on the catalyst surface and in the gas phase in a micro-fixed-bed reactor was derived. The values of the parameters referred to dynamic kinetics were estimated by fitting the solution of the ODEs with the transient response data obtained by the stimulus-response technique with a FTIR analyzer as an on-line detector.     

反应器系统综合可得区法的研究进展

本文综述分析了反应器系统综合可得区法的研究进展,指出了该领域的进一步发展趋势。     

白钨矿型(ABO4)氧化物催化剂的尿素燃烧法制备工艺研究

研究了白钨矿型ABO4(A=碱土金属、过渡金属、镧系金属、主族金属离子等;B=Mo、W)氧化物催化剂的尿素燃烧法制备工艺,考察了燃烧剂尿素的用量、燃烧温度等制备条件与氧化物纯度的关系.结果表明,尿素燃烧法可以获得A位离子为Mg、Ca、Sr、Ba、Cr、Mn、Co、Ni、Zn、Cd、Al的纯AMoO4白钨矿型氧化物催化剂和A位离子为Mg、Ca、Sr、Ba、Mn、Co、Ni、Zn、Cd的纯AWO4白钨矿型氧化物催化剂,A位离子为La、Ce时,得到混合氧化物.     

YSBH-02分子筛催化剂上异丙醇与苯气相烷基化反应的研究

对YSBH-02型分子筛催化剂上异丙醇与苯常压气相烷基化合成异丙苯的工艺过程进行了实验研究。以单因素实验法考察了温度(200～340℃)，苯／醇摩尔比(4．5～15．5)和液相空速(5～50h^-1)对烷基化反应的影响，并基于正交实验设计综合考察了温度、苯／醇比和液相空速对烷基化规律和产物分布的影响。结果表明，YSBH-02型分子筛催化剂对异丙醇与苯气相烷基化具有良好的催化活性和选择性；较为适宜的烷基化条件为：温度280℃，苯／醇摩尔比13：1，液相空速9h^-1。     

化学反应器的稳定性问题(Ⅱ)——管式反应器的稳定性与敏感性

对于放热反应,尤其是气相和气固相强放热反应,定态稳定性和参数敏感性是管式反应器设计、操作中一个十分重要而有趣的课题。本文以若干简单模型为例,简要地说明了管式反应器稳定性和敏感性的基本概念、分析方法与实际应用。     

关于固定床传热的研究

一、前言 自Colburn发表固定床传热的早期论文,至今五十年来,这一领域的研究工作主要沿着两大方向进展。一方面某些作者试图从理论上弄清每种传热机理(传导、对流和辐射)的贡献,而把固定床传热视为是各种传热机理按某种形式的迭加结果。他们提