三维气相色谱法分析碳二加氢组分

采用三阀-四柱-三检测器-三通道气相色谱法对碳二加氢混合组分的分析进行了研究,对仪器重复性、准确性进行了考察,在此基础上,对传统采用的体积(摩尔)外标法的影响因素进行了探讨,在此基础上提出一种新的分析方法—质量归一化法,该方法避免了进样速率(压力)对分析结果的影响,具有更强的实用性和准确性。     

碳二加氢催化剂的现状分析及开发建议

介绍了碳二选择加氢除乙炔工艺概况及反应原理；分析了国内外碳二选择加氢催化剂的研制开发动向；提出了兰化公司开发碳二选择中氢催化剂的开发构想。     

碳二加氢催化剂选择性快速评价法及其应用

从理论推导得出碳二加氢催化剂选择性快速评价法,并用此方法对三种碳二加氢催化剂选择性进行评价,并指出此快速评价法的独特应用。     

碳二加氢反应器的先进控制

通过对反应器串级控制投用，达到了优化操作，降低乙烯损失 ，增加了乙烯收率。     

碳四组分对碳二加氢系统的影响

论述了碳二加氢进料C4组分含量较高的原因及其对反应器的影响,提出了避免反应器飞温和出口漏炔的方法,减少乙烯损失,提高经济效益,节能降耗。     

乙烯装置碳二加氢新型催化剂的应用

对乙烯装置碳二加氢新型催化剂ＢＣ－Ｈ－２０ＡＩ开发进行了论述,并对催化剂的实际工业应用进行分析描述,同时分析了该催化剂工业应用中活性及选择性的情况,最后做了进一步的评价及经济分析。     

LY—268A碳二加氢催化剂工业应用

介绍了ＬＹ－２６８Ａ碳二加氢催化剂的特点及使用效果,从而得出该催化剂基本具备了替代Ｇ－８８Ｃ的条件。     

乙烯装置碳二前加氢工艺技术分析

本文对前脱丙烷分离流程中的前加氢工艺及采用的催化剂的选择性进行技术分析,对茂名乙烯前加氢系统的实际运行进行了简要评价,并对其优化操作进行原则性分析。     

新型碳二加氢催化剂G-58C在乙烯装置上的应用

通过对碳二加氢反应器的调优操作,摸索出了新型碳二加氢催化剂适合齐鲁乙烯装置的最佳操作条件,使反应器的乙烯增量明显提高。     

碳二加氢催化剂的工业应用

在对进口G-58 C和国产LY-C2-02催化剂在兰州石化乙烯装置碳二加氢单元二段反应器的工业应用数据进行分析和比较的基础上,考察了改进型LY-C2-02催化剂的工业应用性能。结果表明:与G-58C催化剂相比,改进型LY-C2-02催化剂具有活性和选择性比较高、操作弹性范围宽、操作稳定等特点,完全适应6000 h-1空速的工艺条件,综合性能与G-58C催化剂水平相当;LY-C2-02催化剂具备替代进口G-58C型催化剂的能力,对实现碳二加氢催化剂国产化、降低乙烯装置成本、增加效益有一定的现实意义。     

粗苯加氢反应系统异常原因分析及改进措施

针对精苯装置苯加氢系统自投料开车以来在生产中存在的问题进行了分析，从操作和设计等方面采取了相应的改进措施，确保了装置的长周期、安全、稳定运行，取得了良好的经济效益。     

Acetylene Hydrogenation on Au-Based Catalysts

Hydrogenation of acetylene has been investigated on Au/TiO₂, Pd/TiO₂ and Au-Pd/TiO₂ catalysts at high acetylene conversion levels. The Au/TiO₂ catalyst (avg. particle size: 4.6 nm) synthesized by the temperature-programmed reduction-oxidation of an Au-phosphine complex on TiO₂ showed a remarkably high selectivity to ethylene formation even at 100% acetylene conversion. Au/TiO₂ prepared by the conventional incipient wet impregnation method (avg. particle size: 30 nm), on the other hand, showed negligible activity for acetylene hydrogenation. Although the Au catalysts showed a high selectivity for ethylene, the acetylene conversion activity and catalyst stability were inferior to the Pd-based catalysts. Au-Pd catalysts prepared by the redox method showed high acetylene conversions as well as high selectivity for ethylene. Interestingly Au-Pd catalysts prepared by depositing Pd via the incipient wetness method on Au/TiO₂ showed very poor selectivity (comparable to mono-metallic Pd catalysts) for ethylene. High-resolution transmission electron microscopy (TEM) studies coupled with energy dispersive X-ray spectroscopy (EDS) showed that while the redox method produced bimetallic Au-Pd catalysts, the latter method produced individual Pd and Au particles on the support.     

乙炔前加氢反应器运行稳定性的研究

针对乙烯生产前脱丙烷前加氢工艺技术的特点,分析了影响乙炔前加氢反应器稳定性的因素,提出了工业生产中避免反应器波动的操作方法。     

乙炔选择加氢催化剂的研究

采用固定床连续流动反应器对12%Ni/CNF、0.5%Pd/CNF、0.5%Pd/α-Al2O33种催化剂上的乙炔加氢反应进行了研究。考察了反应温度、n(H2)/n(C2H2)以及总空速对反应的影响,得到了在n(H2)/n(C2H2)较宽的范围内乙炔加氢为乙烯具有良好选择性的催化剂0.5%Pd/CNF。在50℃,n(H2)/n(C2H2)=23,乙炔空速为106h-1时,乙炔转化率达100%,乙烯收率为64.8%,乙烯选择性为73.8%。     

DNT氢化反应控制系统的设计

设计了针对二硝基甲苯催化氢化反应的控制系统,采用计算机控制,实现反应器的温度、压力及流量等参数控制。催化剂与DNT采用比值控制,保证反应过程的工艺条件、提高其转化率,确保整个工艺过程安全可靠运行。     

Selective Hydrogenation of Acetylene in an Ethylene Stream in an Adiabatic Reactor

In earlier studies the behavior of single catalyst pellets of Pd on alumina has been investigated for the reaction of acetylene in an ethylene stream with hydrogen. Particle runaway, temperature over‐ and undershoots and chemically induced temperature oscillations have been observed. After that, the steady state and dynamic behavior of an adiabatic packed bed reactor has been studied experimentally. Temperature profiles of both the gas and solid phase as well as local temperature differences between the two phases were measured. Also here the temperature in the reaction zone exhibited oscillatory behavior. On addition of CO, the oscillations disappeared and the selectivity improved. For a given set of operating conditions, there existed a relatively small range of CO contents with good selectivity and satisfactory conversion. This range depends strongly on the inlet temperature. The dynamic response of the reactor to changes in the CO content showed a considerable wrong‐way behavior. This high sensitivity to fluctuations in the CO content, found for our experimental reactor, indicates a probable cause for a thermal runaway in industrial practice. Recommendations for a stable reactor operation are given.     

环己醇加氢反应失活的原因分析及对策

介绍一起己二腈混入精苯中造成环己醇加氢反应失活的事故，详细分析了事故的原因，并提出了防范对策。     

TA加氢反应过程分析

对加氢反应器进行了流体力学分析 ,对加氢反应条件进行了探讨 ,并对加氢反应器的增容能力和增容后的影响作了进一步的研究。     

Acetylene and Ethylene Hydrogenation on Alumina Supported Pd-Ag Model Catalysts

Adsorption and co-adsorption of ethylene, acetylene and hydrogen on Pd-Ag particles, supported on thin alumina films, have been studied by temperature programmed desorption (TPD). The TPD results show that adding of Ag to Pd suppresses overall hydrogenation activity but increases selectivity towards ethylene, i.e. similar to that observed on real catalysts. The results are rationalized on the basis of a complex interplay between surface and subsurface hydrogen species available in the system, whereby the latter species are the most critical for total hydrogenation of acetylene to ethane.