共查询到20条相似文献,搜索用时 109 毫秒
1.
介绍了器内预硫化和器外预硫化两种加氢催化剂预硫化技术,阐述了催化剂预硫化反应原理,并对硫化剂进行了比选,讨论了干法硫化和湿法硫化两种器内预硫化技术的特点。干法硫化技术主要适用于分子筛含量较高的加氢催化剂,而湿法硫化技术主要适用于加氢精制类催化剂。通过对比器内预硫化与器外预硫化技术的优缺点,并对国内外器外预硫化技术研究现状进行了综述,认为器外预硫化技术具有开工时间短、环境污染小等优点,必将逐渐替代现有的器内预硫化技术成为加氢催化剂预硫化的主要技术,将是加氢催化剂预硫化技术未来研究发展的方向。 相似文献
2.
3.
4.
5.
6.
7.
加氢处理催化剂器外预硫化技术研究与展望 总被引:1,自引:0,他引:1
预硫化是活化氧化态加氢处理催化剂的重要过程。本文着重综述了加氢处理催化剂器外预硫化技术的研究成果并与器内预硫化进行对比。讨论了应用于不同加氢处理技术特别是加氢脱硫过程获得的认识。阐述和分析了主要器外预硫化技术的优缺点以及相关的硫化机理、活性中心模型。最后介绍了作者单位开发的EPRES技术所取得的进展,其技术优势以及在中国的工业化应用。 相似文献
8.
陈建 《精细与专用化学品》2007,15(16):38-39
采用中国石化抚顺石油化工研究院EPRES器外预硫化技术生产的FH—UDS器外预硫化催化剂,近期在中国石化上海石化分公司330万t/a柴油加氢装置上应用成功。此前这种器外预硫化催化剂已在中国石化齐鲁石化分公司260万t/a柴油加氢装置应用成功,2套装置的成功应用标志着EPRES器外预硫化技术已经成熟。 相似文献
9.
器外预硫化技术是把硫在器外加入到催化剂中、并转化为金属硫化物,在不同条件下比较,预硫化催化剂比常规硫化催化剂活性较高。 相似文献
10.
对加氢催化剂的器内与器外两种预硫化处理技术的优缺点进行了简单的说明,对当前两种技术在实际生产的应用现状也进行了叙述,推测器外预硫化技术将来会是加氢催化剂预硫化技术的发展方向。 相似文献
11.
Shu-Ichi Niwa Fujio Mizukami Shigemi Isoyama Tohru Tsuchiya Kazuo Shimizu Sumi Imai Juichi Imamura 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1986,36(5):236-246
Ruthenium catalysts were prepared in different alcohols by a chemical mixing technique, characterised by the preparation of a homogeneous solution containing catalyst components, and the uniform coagulation of the solution through hydrolysis. The technique has the potential for controlling the surface area of the catalysts and for making them porous. The ruthenium catalysts were much more effective for the partial hydrogenation of benzene to cyclohexene (maximum cyclohexene yield, 31.4%) in the absence of any poison such as alkali metal hydroxide or transitional metal sulphate in the reaction solution. 相似文献
12.
评述了国外催化剂市场上近年来出现的新型催化剂的特点和使用效果,包括加氢脱硫炼油催化剂、炼油催化添加剂、链烯烃聚合催化剂以及尾气净化催化剂。并对世界催化剂市场上的新技术,如混相催化技术、Popy lur工艺、OATS技术、Unipol单反应器技术平台等进行了简要的介绍。环保法规的严厉也推动了相关催化剂和催化技术的发展。 相似文献
13.
14.
15.
Synthesis of propylene glycol methyl ether over amine modified porous silica by ultrasonic technique
《Catalysis communications》2007,8(3):437-441
Amine modified porous silica were synthesized by ultrasonic technique under mild conditions. The samples, which were characterized by BET, 29Si NMR spectra, element analysis and indicator dye adsorption, exhibited promising catalytic properties towards the synthesis of propylene glycol methyl ether from methanol and propylene oxide. They had both high yields and reusability in the reaction, indicating that ultrasonic technique was effective for the preparation of organically modified silica catalysts. Furthermore, the possible reaction mechanism was proposed for the synthesis of propylene glycol methyl ether over such type of catalysts. 相似文献
16.
17.
18.
In the present review of our study, it is shown that the CVD technique using Co(CO)3NO provides a novel characterization technique of hydrodesulfurization (HDS) catalysts combined with the catalyst preparation. The resultant CVD or designed catalysts are very appropriate for the determination of the CoMoS structure and reaction mechanism due to a selective formation of CoMoS. The CVD technique is also very effective to prepare highly active HDS catalysts, since full promotion of MoS2 particles can be achieved. The CVD technique can be applied to estimate the surface structure of supported Co(Ni)–MoS2 catalysts. In addition, the designed catalysts can be used to understand the nature of the support and additives in terms of the intrinsic activity of CoMoS. Thus the information from the CVD technique is unique and invaluable for the development of highly active HDS catalysts. 相似文献
19.
生物柴油的生产技术 总被引:41,自引:0,他引:41
综述了生物柴油生产的原料、催化剂和生产工艺等相关研究进展。介绍了生物柴油的生产几乎可以采用所有的天然油脂作为原料,原料的来源对其性质有一定的影响。目前生物柴油工业化生产工艺主要是均相的酸、碱催化酯交换反应,很多都是在常压、低温下进行。均相酸碱催化剂的优点是反应转化率高,但是废催化剂会带来环境问题。非均相催化剂和酶催化剂则是目前研究的热点,固体碱、固定化酶等催化剂可以很容易从反应产物中分离出来。高温高压技术、超临界技术等被用于酯交换反应过程,反应可以在数分钟内完成。高速乳化技术、超声技术及微波技术等反应强化手段可以改善酯交换过程中的传质过程,有利于不完全互溶的醇油两相进行反应。 相似文献
20.
Frank R. Hartley 《Polymer International》1984,16(4):199-204
The technique of γ radiation grafting is shown to be of value in functionalising mechanically strong, chemically simple and chemically inert polymers such as polypropylene. The technique leads to the incorporation of several functional groups at a single site on the polymer which is of value in creating a three-dimensional catalytically active site. Such sites enable the local environment to further enhance the natural selectivity arising from the molecular nature of a metal complex catalyst. Accordingly, supported metal complex catalysts prepared in this way have higher selectivities than their homogeneous analogues. The approach is illustrated by reference to cobalt and rhodium(I) olefin hydroformylation catalysts; in both cases the supported catalysts show greater selectivity towards the formation of normal as opposed to branched aldehydes than their homogeneous analogues. 相似文献