氨合成催化剂使用总结

介绍了中海石油化学股份有限公司化肥二部A-110-1、A-110-1-H型氨合成催化剂的装填,还原情况,并对需要注意的问题做了分析。结合催化剂的组成和性能就如何延长催化剂的使用寿命做了全面总结。     

氨合成催化剂运行情况总结

介绍了氨合成催化剂的运行情况,对最初使用的A110-1H型催化剂部分更换为A301、A-10H后的运行情况进行了比较。     

氨合成催化剂使用总结

介绍中海石油化学股份有限公司化肥二部A110-1、A110-1H型氨合成催化剂的装填、还原情况,并对需要注意的问题做了分析.结合催化剂的组成和性能就如何延长催化剂的使用寿命做了全面总结.     

季铵盐催化合成7,7-二氯双环[4.1.0]庚烷

研究了季铵盐A-1催化二氯卡宾与环己烯的加成反应,考察了不同相转移催化剂的催化活性、反应温度、催化剂用量、反应时间对产物7,7-二氯双环[4.1.0]庚烷收率的影响.在优化反应条件(即反应温度为50C,反应时间为5 h)下,以季铵盐A-1为相转移催化剂,产率可达94.0%.实验证明,季铵盐A-1的催化活性要优于其他短碳链的季铵盐和聚乙二醇,并且在分离过程中不乳化,使产物易于分离纯化.     

我厂110kV总降的技术改造

1 技改内容 (1)将3台SW4-110Ⅱ小车型少油断路器改为LW11A-110/1600 SF6断路器.     

A110-1H/A110-1型催化剂在卧式氨合成塔上的应用

根据A110-1H/A110-1型催化剂在塔西南化肥厂卧式氨合成塔上的应用,总结了在卧式合成塔应用110-1H/A110-1型催化剂的一些体会,提出了更换同类型催化剂的具体操作方法。     

ZA-5型与ZA-5-H型氨合成催化剂的生产及性能

介绍了ZA - 5型与ZA - 5 -H型氨合成催化剂生产工艺。ZA - 5型是一种多助剂Fe1-xO基熔铁氨合成催化剂 ,具有易还原的特性。同等条件下的检测结果表明 ,ZA - 5型催化剂活性高于A110 - 1型、74- 1型及AC型催化剂 ;ZA - 5 -H型预还原催化剂活性高于A110 - 1-H型及 74- 1-H型催化剂     

A301型氨合成催化剂物理化学性能

系统研究了A301型氨合成催化剂还原前、后的物化性能和宏观结构,并与传统熔铁催化剂作了比较.研究结果表明,催化剂的比表面积和孔结构是在还原脱氧过程中产生的,还原前的催化剂可视为无孔隙的致密固体.A301的比表面积和α-Fe晶粒度与A110-2相同,但α-Fe表面积和碱表面积比A110-2小,而酸表面积比A110-2大.A301的堆密度和颗粒密度均比A110-2大,但真密度比A110-2小.A301催化剂的孔容积、孔隙率和孔径都比传统催化剂小,这与Nielsen A的研究结果不一致.Fe_(1-x)O对基的A301催化剂活性的提高,不是因为它的比表面积或孔径增大,也不是因为它的含铁量增加,而是由于Fe_(1-x)O还原得到的α-Fe的表面性质(例如酸表面积增大)和表面结构发生变化,使比活性提高之故.     

A110-1型氨合成催化剂应用总结

介绍了A110-1型氨合成催化剂的装填和还原情况.在生产操作中,应通过维护热稳定性、控制催化剂层温度和适宜的氢氮比、防止催化剂毒物侵入等措施,以延长催化剂的使用寿命.     

相转移催化氧化法合成硝基苯甲酸

研究了季铵盐 A- 1催化高锰酸钾氧化邻、对硝基甲苯 ,合成邻、对硝基苯甲酸的反应。考察了不同相转移催化剂的催化活性 ,催化剂用量、反应温度、反应时间、KMn O4 用量和反应体系酸碱性对反应的影响。在优化反应条件 ,即以季铵盐 A- 1为相转移催化剂 ,高锰酸钾与硝基甲苯摩尔比为 2 .5∶ 1 ,反应温度为 95°C,反应时间为 3h,在中性条件下进行反应 ,邻位、对位产物收率分别可达 95 %、92 %。实验表明 ,季铵盐 A- 1对于高锰酸钾氧化硝基甲苯合成硝基苯甲酸的反应 ,是一种优良的相转移催化剂     

重整原料脱硫保护剂的研究和工业应用

贵金属重整催化剂对重整原料油中的含硫量有严格要求。重整原料脱硫保护剂按活性组分分为碱土金属化合物脱硫剂、NiO/MgO/Al₂O₃及MnO/Al₂O脱硫剂、ZnO脱硫剂和以镍为活性组分的脱硫剂。综述了国内外各种重整原料油脱硫保护剂的开发和使用情况， 介绍了西北化工研究院开发的新型TCS-18脱硫保护剂的性能和工业应用。     

茂金属聚乙烯催化剂工业应用研究

北京化工研究院合成了50余种新型茂金属化合物,在茂金属催化剂均相乙烯聚合的系统研究基础上,深入研究了载体茂金属催化剂的制备方法和制备条件等因素与载体催化剂性能的关系,研制出性能优异的载体茂金属催化剂。采用载体茂金属催化剂进行了浆液法和气相法乙烯聚合中试研究,还进行了茂金属聚乙烯树脂的加工应用研究,树脂性能与国外同类产品相当。     

JT-4和JT-1G型加氢催化剂的预硫化

介绍了清江石化有限责任公司制氢装置应用JT-4和JT-1G型加氢催化剂的硫化过程以及硫化过程中对相关工艺条件的操作控制经验。     

二甲醚一步法合成技术研究进展

综述了从合成气直接制取二甲醚的催化剂、固定床工艺和浆态床工艺的研究状况 ,对比了 5种催化剂的组成和性能 ,介绍了日本钢管公司 (NKK)和美国空气产品化学品公司开发的浆态床工艺进展情况     

Oxidative dehydrogenation of ethane over alkali‐metal doped sulfated zirconia catalysts

Alkali‐metal doped sulfated zirconia catalysts were tested for the oxidative dehydrogenation of ethane into ethene. The effects of metal precursor compounds and acidic anion promoters on the catalytic activity in this reaction were studied. It was found that sulfation of zirconia increases the selectivity of ethane towards ethene. Lithium‐, sodium‐, and potassium‐doped sulfated zirconia catalysts showed quite different activities in this reaction. Sulfated zirconia doped with lithium catalysts were found to be effective for the oxidative dehydrogenation of ethane, giving over 90% selectivity to ethene and 25% ethene yield at 650 °C. © 1999 Society of Chemical Industry     

Decolourisation of dyes and dyehouse effluent in a bubble‐column reactor by heterogeneous catalytic ozonation

The decolourisation of aqueous solutions of dyes by ozonation with various heterogeneous catalysts using a bubble‐column reactor was investigated. The catalysts studied were hydrated alumina, activated carbon and ferric oxide supported on silica. The optimum catalyst concentration and pH for decolourisation were determined in each case. Hydrated alumina and silica‐supported ferric oxide showed excellent catalytic activity under acidic conditions, whereas activated carbon was found to be effective under both acidic and alkaline conditions. In addition to studying the effect on individual dyes, tests were carried out on effluent from a commercial dyeing unit. The reaction kinetics in the presence of various catalysts were also monitored. Copyright © 2005 Society of Chemical Industry     

超低固汞触媒在电石法氯乙烯生产中的应用

介绍了超低固汞触媒在内蒙古亿利化学工业有限公司氯乙烯装置上的应用,指出超低固汞触媒可以有效降低氯化汞消耗量,进而降低汞的排放。超低固汞触媒催化活性与低汞触媒活性相当,可以满足现有装置的生产要求。     

Control of molecular weight distribution (MWD) for polyethylene catalyzed over Ziegler-Natta/Metallocene hybrid catalysts

Two types of inorganic supports, MgCl₂ and SiO₂, for the impregnation of catalysts were prepared by the recrystallization and sol-gel methods, respectively. The Ziegler-Natta/Metallocene hybrid catalysts were prepared in order to control the molecular weight (Mw) and the molecular weight distribution (MWD) during ethylene polymerization. The polyethylene produced by the hybrid catalysts can control the Mw and the MWD of polymer, showing two melting temperatures and a bimodal MWD, corresponding to products arising from each of the individual catalysts. This suggests that these hybrid catalysts acted as individual active species and produced a blend of polymers. This paper was presented at the 8th APCChE (Asia Pacific Confederation of Chemical Engineering) Congress held at Seoul between August 16 and 19, 1999.     

Low-Temperature Catalytic Decomposition of N2O

Theoretical Foundations of Chemical Engineering - A series of oxide catalysts modified with potassium cations, 1–5% K2О/CoFe2O4, with a spinel structure were obtained via...     

Deactivation of CuZn Catalysts Used in Glycerol Hydrogenolysis to Obtain 1,2-Propanediol

Different CuZn catalysts were prepared by coprecipitation method with Cu/Zn atomic ratio of 0.2, 0.4, 1.0, 2.5 and 6.0. Monometallic Zn and Cu catalysts and a bimetallic catalyst (Cu/Zn?=?2.5) prepared by physical mixture of the precursors were also studied. These catalysts were tested in the glycerol hydrogenolysis reaction and the higher yields to 1,2-propanediol were achieved for Cu/Zn atomic ratio?≥?1 samples. The deactivation of a representative catalyst (Cu/Zn?=?1) was evaluated and its yield to 1,2 propanediol decreases until ca 40% after five runs. To explain this behavior, fresh and used catalysts were characterized by different techniques. Chemical analysis of solid catalysts and liquid reaction medium confirmed the leaching of Zn species under our reaction conditions. This process promotes Cu sintering which is proposed as the actual reason of the observed deactivation in the glycerol hydrogenolysis for this catalytic system.