共查询到20条相似文献,搜索用时 140 毫秒
2.
绿色合成,作为当代有机合成发展的一个重要学科前沿,已成为化学发展的一个方向。从催化剂、绿色溶剂、合成手段、合成方法、计算机辅助绿色合成等方面综述了近年来国内外实现绿色合成的有效途径,并对绿色合成的目标进行了探讨。参考文献35篇。 相似文献
3.
4.
5.
6.
7.
介绍了甲醇,异丁烯合成甲基叔丁基醚的催化剂,热力学,动力学。综述了合成MTBE的主原原料异丁烯的生产过程,并总结了甲醇,异丁醇和甲醇,叔丁醇合成了MTBE的研究开发进展,参考文献16篇。 相似文献
8.
9.
10.
11.
12.
13.
维生素K3电化学反应机理的紫外光谱电化学研究 总被引:4,自引:0,他引:4
用薄层池循环伏安法和现场薄层池紫外光谱电化学法研究了维生素K3(VK3)在铂电极上的电化学反应机理。薄层池循环伏安实验结果表明:VK3的电化学反应为二步1e准可逆过程,现场薄层池紫外光谱电化学的实验结果和Nernst图解分析表明:电解还原反应的最后产物为2-甲基-1,4-萘酚。该反应偶合有前行化学反应;还原产物经电解氧化的产物为2-甲基-1,4-萘酚。该反应偶合有前行化学反应;还原产物经电解氧化的 相似文献
14.
《Journal of Coordination Chemistry》2012,65(9):1530-1540
The reaction between boron trifluoride methanol complex and sodium methoxide in methanol solution was investigated using conductivity as the reaction indicator. The reaction conditions were examined and a mechanism of this reaction was proposed. Moreover, proper reaction conditions were proposed for boric acid preparation using this reaction. 相似文献
15.
16.
17.
Yu Ping Song Yuanfeng Yuan Qinghua Wang Leilei Li Jianming Qiu Nanyuan 《化学物理学报(中文版)》2005,18(4):573-576
The principle and experimental law of testing sets to test reaction temperature change were introduced. Using “powder sputtering plane thin-film SnO2/CeO2 alcohol sensor”, the reaction temperature change was tested and the law of versus gas concentration was given by the inserting method. The rate equation of surface reaction was deduced and reaction probability of surface molecule was calculated. The general reaction rate equation includes two kinds of experiential formula—hyperbolic and power function formula and the concept of molecule reaction probability is minor, which in general is 10-3-10-5. 相似文献
18.
In the present study, the reaction kinetics of polybutylene terephthalate (PBT) and epoxy system was studied by a novel rheological method. The reaction process was determined by rheological test and the results showed that there were three stages in the reaction between PBT and epoxy, which were reaction-controlling stage (stage I), reaction-stagnation stage (stage II) and diffusion-controlling stage (stage III). In addition, the stage I was selected to study the reaction kinetics by the rheological method. The results showed that the reaction between PBT and epoxy could be classified as a pseudo-first-order reaction due to the excessive amount of epoxy group. Furthermore, the reaction apparent activation energy of the stage I determined by the rheological method was 143 kJ/mol. To confirm these results, the reaction kinetics was also evaluated by the endgroup determination method, and the results showed that the reaction could also be classified as a pseudo-first-order reaction. Moreover, the apparent activation energy of the reaction was 116 kJ/mol, which was similar to that of the value obtained by the rheological method. 相似文献
19.
20.
本文以纳米TiO2为催化剂,UV-LED(=365 nm)为紫外光源,在自制的恒温石英玻璃光催化反应器中成功实现了芳香醛的非均相光催化缩醛反应.以乙醇等作为溶剂和反应物,快速高效和高选择性地合成了苯甲醛二乙基缩醛(BDA).在光强为0.6 mw/cm2,苯甲醛初始浓度为0.05 mol/L,催化剂TiO2(P25)用量为5.0 g/L,反应时间为15 min的条件下,苯甲醛二乙缩醛的产率可达99.86%.研究表明,氧气的存在是顺利发生光催化缩醛反应的重要条件.反应液pH值、醇溶剂种类及苯环对位取代基等因素都会对光催化缩醛反应速率和产率产生影响.pH值及醇溶剂的pKa越小,缩醛反应速率越快.苯环上对位取代基会抑制缩醛反应的进行,其中供电子取代基相对吸电子取代基更有利于缩醛反应进行.结合实验,提出了光催化缩醛反应的机理. 相似文献