共查询到19条相似文献,搜索用时 312 毫秒
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《化工进展》2016,(3)
镍配合物是一类重要的乙烯齐聚催化剂,由于具有活性高、反应条件温和及选择性高等优点,在α-烯烃的合成方面已显示出良好的应用前景。本文综述了近年来国内外乙烯齐聚合成α-烯烃用镍配合物催化剂最新研究进展,从配体的分子结构进行分类,重点阐述了亚胺吡啶配体镍配合物催化剂和吡唑配体镍配合物催化剂的研究现状,包括配体的结构、取代基效应及工艺条件等对催化活性和产物分布的影响,同时对其他类型的配体包括甲臜、膦-唑啉、噻吩及双核结构、树枝状结构催化剂的开发现状也进行了简要的介绍。研究镍配合物的精细结构对催化剂活性和α-烯烃选择性的影响,对设计具有工业化应用前景的高碳α-烯烃催化剂具有重要意义。 相似文献
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合成了配合物氯化2-乙酰基-1,10-菲咯啉缩2,6-二乙基苯胺合铁(Ⅱ),以甲苯为溶剂,甲基铝氧烷为助催化剂,催化乙烯齐聚制备线型α-烯烃.催化剂表现出高活性和对α-烯烃的高选择性.考察了反应温度、n(Al)/n(Fe)、反应压力和催化剂浓度等对催化剂活性和齐聚产物分布的影响. 相似文献
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α-烯烃齐聚制PAO催化剂的研究进展 总被引:5,自引:0,他引:5
对近年来α-烯烃齐聚反应合成PAO(聚α-烯烃润滑油基础油)的催化剂的研究进展进行了综述。介绍了AlCl3体系、BF3体系、Ziegler-Natta体系与酸性离子液体等几种类型的催化剂,评价了各种催化剂的优缺点,并提出了今后烯烃齐聚反应催化剂的发展方向。 相似文献
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合成了配合物氯化2-乙酰基-1,10-菲咯啉缩2,6-二异丙基苯胺合铁(Ⅱ),以甲苯为溶剂,甲基铝氧烷(MAO)为助催化剂,催化乙烯齐聚制备线型α-烯烃。催化剂表现出高活性和对α-烯烃的高选择性。考察了反应温度、n(Al)/n(Fe)和反应压力等对催化剂活性和齐聚产物分布的影响。 相似文献
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以1-癸稀为主要原料,BF3为主催化剂,采用齐聚反应获得聚α-烯烃合成润滑油(PAO),为了获得较高含量的三聚物、四聚物的齐聚产品,研究了反应温度、反应时间以及助催化剂对PAO产品分布的影响,结果表明,最佳的反应条件为:反应温度为25℃,反应时间为4 h,助催化剂选择正丁醇。以此条件获得的产品基本符合美国石油学会(API)聚α-烯烃合成润滑油指标要求。 相似文献
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乙烯齐聚催化剂研究进展 总被引:1,自引:0,他引:1
乙烯齐聚是合成直链低碳α-烯烃最先进的方法,直链低碳α-烯烃可用于生产低密度聚乙烯和高密度聚乙烯等多种精细化学品。本文综述了乙烯齐聚催化体系的研究进展,重点介绍了镍、锆、钛催化剂的组成以及反应时间、反应温度、溶剂、助催化剂等因素对乙烯齐聚活性和选择性的影响,并讨论了典型镍的催化机理。 相似文献
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Deoxygenation of methyl esters and triglycerides was studied for production of either α-olefins or diesel components. The reactions were carried out in a reactive distillation fashion in which products are quickly removed from the reaction mixture in flowing He. The effects of He flow rate, reaction temperature, active component and support were studied. PtSnK supported on silica was found to be the best catalyst for selective production of α-olefins. Palm kernel oil and coconut oil were also deoxygenated to produce α-olefins or diesel components, depending on reaction conditions. 相似文献
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Deepak Chandran Chang Hun Kwak Jae Min Oh In Yong Ahn Chang-Sik Ha Il Kim 《Catalysis Letters》2008,125(1-2):27-34
A set of structurally modulated salicylaldimine cobalt(II) complexes have been synthesized and utilized them for ethylene oligomerizations in combination with various organoaluminum cocatalysts. All catalyst systems yielded α-olefins with butenes as major product. The catalytic activity and product distribution were affected by the catalytic structure and reaction conditions. The formation of active species in these complexes under oligomerization conditions was investigated by UV-VIS spectroscopy and the results matched well with oligomerization results. 相似文献
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P. M. Bakker 《European Journal of Lipid Science and Technology》1974,76(11):501-504
Preparation of Modified Carboxylic Acids from α-Olefins by Hydroxycarbonylation The hydroxycarbonylation of α-olefins to carboxylic acids was investigated. Yields around 95% were achieved using NiJ2 as catalyst at temperatures of ca. 200°C and carbon monoxide pressure of 30 atm. and higher for 3–7 hrs. The acids are composed mainly of isomers having 2-methyl branching as well as the normal ones and the 2-ethyl acids. Ca. 95% of the NiJ2 is recovered from the reaction product by washing with water. 相似文献
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以1-癸烯为原料,分别采用AlCl3/TiCl4和氯化铝催化体系进行了合成1-癸烯齐聚化合物的研究。研究结果表明两催化剂均可实现1-癸烯齐聚化合物的合成,但两者聚合度有差异,考虑后续处理和环境污染问题,宜采用AlCl3/TiCl4催化体系,并初步确定该反应体系最佳反应温度为40℃、反应时间为4h;齐聚反应动力学过程测试表明,随着齐聚反应的进行,CH2双键逐步减少同时伴随CH不断的生成和消耗,均呈现出同步下降趋势,表明齐聚反应过程中存在着α-烯烃的歧化反应,且歧化产物参与了齐聚反应;连续在线各官能团红外谱图分析反映出的可能反应过程与以最终反应产物的信息来推断反应过程研究文献报道基本吻合。 相似文献
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Comparative data on the molecular weight distribution of polymers obtained by polymerization of ethylene, propylene and 1-hexene, and copolymerization of ethylene with α-olefins over the titanium-magnesium catalysts (TMC) in the absence and presence of hydrogen are presented. In contrast to the ethylene polymerization, in the cases of propylene and 1-hexene polymerization and copolymerization of ethylene with α-olefins, the hydrogen addition is characterized by noticeable narrowing of the molecular weight distribution (MWD) due to lower contribution of the MWD component with high molecular weight. This result is an evidence of the increased reactivity of TMC active sites producing high molecular weight poly-α-olefins and copolymers of ethylene with α-olefins in the chain transfer reaction with hydrogen. It is suggested that the increased reactivity of these sites in the transfer reaction with hydrogen appears after the 2,1-addition of α-olefin to the growing polymer chain. 相似文献