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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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直链烯烃生产能力及合成工艺概况 总被引:4,自引:0,他引:4
叙述了目前国内外α-烯烃和直链内烯烃的生产能力及合成工艺发展概况。国内α-烯烃生产主要以蜡裂解工艺为主,总生产能力约26万t/a,少量采用U0P公司的Pacol/Alkyle法生产的直链内烯烃。国外α-烯烃生产以乙烯齐聚法为主要合成工艺,总生产能力约212万t/a。国外UOP Pacol直链内烯烃生产直链烷基苯能力约108万t/a。我国UOP Pacol直链内烯烃生产直链烷基苯能力约24万t/a。蜡裂解装置生产的α-烯烃产品质量差,污染严重,难于综合利用。我国的线型低密度聚乙烯及高密度聚乙烯装置随着生产的高档化,高碳烯烃共聚的需求量及产量必须以较高的增长率增长,而我国尚无高碳烯烃生产能力,此领域将是Shop烯烃很好的市场。 相似文献
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叙述了目前国内外α-烯烃和直链内烯烃的生产能力及合成工艺发展概况.国内α-烯烃生产主要以蜡裂解工艺为主,总生产能力约26万t/a,少量采用UOP公司的Pacol/Alkyle法生产的直链内烯烃.国外α-烯烃生产以乙烯齐聚法为主要合成工艺,总生产能力约212万t/a.国外UOP Pacol直链内烯烃生产直链烷基苯能力约108万t/a.我国UOP Pacol直链内烯烃生产直链烷基苯能力约24万t/a.蜡裂解装置生产的α-烯烃产品质量差,污染严重,难于综合利用.我国的线型低密度聚乙烯及高密度聚乙烯装置随着生产的高档化,高碳烯烃共聚的需求量及产量必须以较高的增长率增长,而我国尚无高碳烯烃生产能力,此领域将是Shop烯烃很好的市场. 相似文献
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本文介绍国内α-烯烃的发展现状和实际应用前景,指出我国发展以乙烯齐聚生产α-烯烃和提高蜡裂解α-烯烃质量的重要性,加速发展α-烯烃在聚乙烯共聚单体、高碳醇和表面活性剂、合成润滑油及增塑剂醇等方面的应用,可取得明显经济效益和社会效益。 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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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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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献