共查询到18条相似文献,搜索用时 187 毫秒
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二氧化硅负载羧甲基纤维素铂络合物催化氢化苯甲酸乙酯性能 总被引:2,自引:0,他引:2
合成了一种天然高分子催化剂———二氧化硅负载羧甲基纤维素铂络合物 (简写为Si CMC Pt) ,并研究了它对苯甲酸乙酯的催化加氢反应。结果表明 ,所合成的催化剂可以在 60~ 70℃、0 .1MPa下 ,以 1 0 0 %的收率将苯甲酸乙酯转化为环己基甲酸乙酯。多次重复使用后 ,该催化剂的催化性能基本没有改变。 相似文献
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本文以无水乙醇为溶剂,铟/氯化铵为催化剂,高效催化合成了对氨基苯甲酸乙酯,确定的最佳反应条件为,对硝基苯甲酸乙酯:氯化铵:铟=1:5:0.5,反应温度为回流温度,反应时间为两小时,反应收率在95%左右。 相似文献
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固体超强酸SO4^2—/ZrO2催化合成对羟基苯甲酸乙酯 总被引:6,自引:0,他引:6
以固体超强酸SO4^2-/ZrO2为催化剂合成了对羟基苯甲酸乙酯,并研究了催化剂等条件对反应的影响,在最佳反应条件下,酯收率达到80.1%。 相似文献
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TiO2/SO4^2——Al2O3催化合成对硝基苯甲酸乙酯的研究 总被引:1,自引:0,他引:1
以复合固体超强酸为催化剂,合成了对硝基苯甲酸乙酯,通过正交试验,考察了原料配比,催化剂用量、反应时间等因素对产物收率的影响,确定了酯化最佳条件:酸/醇比1:5,反应时间2h,催化剂用量为反应物质量的4%,该条件下,产物收率达97.6%。 相似文献
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催化合成对羟基苯甲酸乙酯的研究 总被引:8,自引:0,他引:8
研究了用磷钨酸为催化剂,以苯作带水剂,由地羟基苯甲酸、无水乙醇合成对羟基苯甲酸乙酯,并考察了诸因素对收率的影响。找出了最佳的反应条件。 相似文献
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以苯甲酸乙酯与水合肼反应得苯甲酰肼、再与2-氯-7-甲基喹啉得到目标产物8-甲基-1-苯基-[1,2,4]三唑[4,3-a]喹啉,其结构经1HNMR确认。考察了水合肼用量对苯甲酰肼产率的影响、不同溶剂对8-甲基-1-苯基-[1,2,4]三唑[4,3-a]喹啉产率的影响。结果表明,水合肼与苯甲酸乙酯摩尔比为2.1制备苯甲酰肼结果最佳,正丁醇作溶剂制备8-甲基-1-苯基-[1,2,4]三唑[4,3-a]喹啉效果更好。 相似文献
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Piotr Sobota 《Polymer-Plastics Technology and Engineering》2013,52(5-6):493-510
Most of the research in the field of olefin polymerization is focused on TiC1, catalysts on a specially prepared MgCl, support. In order to combine a high polymer yield with good stereoselectivity, a complexed cocatalyst is used. Most frequently it is a mixture of AIEtzCl or AlEt, with an electron donor such as tetrahydrofuran (THF) or ethyl benzoate for ethylene and propylene polymerization, respectively. 相似文献
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Jantip Suesat Thanarak Mungmeechai Potjanart Suwanruji Waraporn Parasuk John A Taylor Duncan A S Phillips 《Coloration Technology》2011,127(4):217-222
A series of azo disperse dyes was synthesised and the purified, synthesised dyes were characterised by proton nuclear magnetic resonance, thin‐layer chromatography and melting point measurement. The spectroscopic properties of the dyes in solution were studied by dissolving the dyes in ethyl acetate and methyl benzoate. These were seen as mimicking the environment of the dye when inside dyed poly(lactic acid) and poly(ethylene terephthalate), respectively. Reflectance spectra of the dyes on both polyester substrates were also measured in order to correlate with the spectroscopic properties of the dyes in solution. The absorbance spectra of the dyes in solution exhibited a hypsochromic (lower wavelength of maximum exhaustion) shift when dissolved in ethyl acetate, compared with methyl benzoate. The occurrence of this yellow shift was attributed to the lower polarity of ethyl acetate compared with methyl benzoate. The colour of the dyes in ethyl acetate solution was also brighter and stronger (higher molar extinction coefficients) than that in methyl benzoate. Most of the synthesised dyes exhibited high levels of exhaustion onto the two polyester fabrics. However, the visual colour yields, for those dyes having approximately the same high level of exhaustion, were different, the dyed poly(lactic acid) being stronger (higher K/S value) as well as being yellower and a trace brighter than the dyed poly(ethylene terephthalate). This difference correlated well with the solvatochromic study of the dyes in ethyl acetate and methyl benzoate solution. 相似文献
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对甲苯磺酸催化合成苯甲酸乙酯 总被引:9,自引:0,他引:9
用对甲苯磺酸作苯甲酸和乙醇直接酯化合成苯甲酸乙酯的催化剂,可以克服硫酸作催化剂时易腐蚀设备、产生大量废酸等缺点.研究了催化剂用量、原料配比及反应时间对酯化反应的影响,试验结果表明:对甲苯磺酸是酯化反应的优良催化剂,在较优化的反应条件下酯化率可达96%以上,产品香气特征突出,符合折光指标和感官评价要求,适应环境保护需要,适合工业推广. 相似文献