共查询到20条相似文献,搜索用时 46 毫秒
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简单介绍了工业化生产环氧丙烷的方法及其优缺点,对近年来Cu基和Cu-Ag双金属催化剂上丙烯氧气直接环氧化制环氧丙烷的研究进展进行了详细的总结,重点介绍了催化剂的微观结构、修饰剂选择、双金属协同作用等与环氧化反应性能之间的关联,初步探讨了丙烯环氧化的反应机理,并对该研究方向进行了展望。 相似文献
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于剑昆 《化学推进剂与高分子材料》2007,5(2):13-17
详细介绍了用分子氧作氧化剂使丙烯直接环氧化来制备环氧丙烷的工艺。该直接法工艺又分为一体化法、氧气直接氧化法和氢氧直接氧化法3种,介绍了工艺中所用的催化剂,同时比较了各方法的优缺点。 相似文献
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对环氧丙烷生产技术的现状及新动向进行了综述,提出以Si-Ti分子筛为催化剂的丙烯直接环氧化法是今后发展的方向。 相似文献
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《精细化工原料及中间体》2008,(6)
1,2-环氧丙烷的制备方法本发明涉及1,2-环氧丙烷的制备方法,其是向填充有环氧化固体催化剂的环氧化反应器供给有机过氧化物和丙烯,通过环氧化反应连续制备1,2-环氧丙烷的方法,该方法含有下述丙烯前处理步骤。丙烯前处理步骤:对供给环氧化反应器的丙烯的至少一部分进行处理的步骤,是除去丙烯中含有的含氧有机化合物的步骤。 相似文献
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研究了异丙醇作为溶剂时,TS-1催化丙烯H2O2环氧化反应过程主副反应动力学,分析了丙烯压力、温度等因素对反应的影响,发现当温度低于40℃、丙烯压力为0.3MPa时,环氧丙烷的收率达到75%,可以采用异丙醇法制H2O2与丙烯环氧化集成。 相似文献
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氯丙醇减压皂化生产环氧丙烷*刘家祺孙广智刘禾(天津大学化工系,天津300072)(天津化工设计院,天津300193)氯丙醇减压皂化生产环氧丙烷*刘家祺孙广智刘禾(天津大学化工系,天津300072)(天津化工设计院,天津300193)关键词氯丙醇环氧丙... 相似文献
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环氧丙烷与二氧化碳合成碳酸丙烯酯 总被引:1,自引:0,他引:1
介绍了PC的性质、应用情况和生产工艺。通过对影响合成PC的主要因素和机理的讨论,指出催化剂和溶剂是影响PC收率的重要因素,较高的压力对提高产品的选择性有利。 相似文献
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丙烯的市场现状及其预测 总被引:1,自引:0,他引:1
概述了丙烯的工业来源、主要用途、供需现状,对当前丙烯超紧的形势和将来的供需状况进行了分析和预测,并提出了增产丙烯的具体途径。同时对我国丙烯的供需现状进行了简要的说明。 相似文献
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介绍了年产7万吨聚丙烯装置主要工艺设备--环行管状反应器仿真培训模型的建立。 相似文献
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合成了四苯基铁卟啉并用于催化丙烯环氧化合成环氧丙烷,考察了共还原剂种类、催化剂浓度、共还原剂用量、反应时间、反应温度、反应压力对实验的影响。该反应适宜的条件为1.74×10~(-5)mol/L催化剂TPPFe~(Ⅲ)Cl;1.31×10~(-4)mol/L助催化剂3-吲哚乙酸;共还原剂丙烯醛,n(正丁醛)∶n(丙烯)=1∶1.2;溶剂二氯甲烷,n(二氯甲烷)∶n(丙烯)=15.45;反应温度98℃;反应压力1.65 MPa;反应时间1.8 h。在该条件下,丙烯的转化率为35.04%,环氧丙烷的收率和选择性分别达34.28%和97.83%。 相似文献
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Selective Oxidation of Propylene to Propylene Oxide by Molecular Oxygen over Ti-Al-HMS Catalysts 总被引:1,自引:0,他引:1
Ti- and Al-containing hexagonal mesoporous silicas (HMS) were synthesized at ambient temperature using dodecylamine as surfactant, and the resultant compounds were used as catalysts for the oxidation of propylene by molecular oxygen. Ti-Al-HMS, which was prepared by reaction of Ti(iso-OC3H7)4, Al(iso-OC3H7)3 and SiOC2H5)4 in an alcohol-aqueous solution in the presence of dodecylamine, showed 47.8 of conversion and 30.6 of selectivity for propylene oxide (PO) at 523K. The yield of PO over Ti-Al-HMS (14.6) was much higher than those over Ti-HMS (1.3) and Al-HMS (0.9) at the same reaction conditions. Ti-Al-HMS was also found to be more effective for PO formation than the supported catalysts (Ti/Al-HMS and Al/Ti-HMS) prepared by impregnation method. These results indicated that the simultaneous existence of Ti and Al in HMS was very important for improving the yield of PO from the oxidation of propylene, and the synthesis method influenced the catalytic activity of the Ti- and Al-containing HMS catalysts. 相似文献
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The direct oxidation of propylene to propylene oxide (PO) using molecular oxygen has many advantages over existing chlorohydrin and hydroperoxide process, which produce side products and require complex purification schemes. Recent advances in liquid-phase and gas-phase catalytic oxidation of propylene in the presence of only molecular oxygen as oxidant and in absence of reducing agents are summarized. Liquid-phase PO processes involving soluble or insoluble Mo, W, or V catalysts have been reported which provide moderate conversions and selectivities, but these likely involve autoxidation by homogeneous chain reactions. Gas-phase PO catalysts have been mostly Ag-, Cu-, or TiO2-based substances, although other compositions such as Au-, MoO3-, Bi-based catalysts and photocatalysts have also been suggested as possibilities. The Ag catalysts differ from those used for ethylene oxide production in having high Ag contents and numerous additives. The additives are solid-phase alkali metals, alkaline earth metals, and halogens, with the most common substances being NaCl and CaCO3. Nitrogen oxides in the form of gas-phase species or nitrates have also been found to be effective in enhancing PO production. Direct epoxidation by surface nitrates is a possibility. Titania catalysts supported on silicates have also been reported. These have higher PO selectivities at high conversion than silver catalysts. 相似文献