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首页> 外文期刊>Indian Journal of Chemistry, Section A. Inorganic, Physical, Theoretical & Analytical >Para-selective ethylation of t-butylbenzene with diethyl carbonate over mesoporous molecular sieves
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Para-selective ethylation of t-butylbenzene with diethyl carbonate over mesoporous molecular sieves

机译:介孔分子筛上叔丁基苯与碳酸二乙酯的对位选择性乙基化

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摘要

The vapour phase ethylation of t-butylbenzene (t-BB) with diethyl carbonate has been studied over mesoporous Al-MCM-41 (Si/Al = 50 and 90) and Al,Mg-MCM-41 [Si/(Al+Mg) = 50] from 200 to 400 deg C. The products are benzene, ethylbenzene (EB), p-diethylbenzene (p-DEB), p-t-butylethylbenzene (p-tBEB) and p-t-butylvinylbenzene (p-tBVB). t-Butylbenzene conversion increases with increase in temperature up to 300 deg C, but above this temperature it decreases. Ortho and meta-products are completely absent. Ethylbenzene is the product of ethylation of benzene and cracking of p-tBEB. The selectivity of para-t-butylated products is favoured at lower temperature while higher temperature favours ethylbenzene selectivity. The influence of time on stream is examined over Al-MCM-41 (50) and the results are discussed in this paper.
机译:在介孔Al-MCM-41(Si / Al = 50和90)和Al,Mg-MCM-41 [Si /(Al + Mg)上,研究了叔丁基苯(t-BB)与碳酸二乙酯的气相乙基化)= 50](200至400摄氏度)。产物为苯,乙苯(EB),对二乙苯(p-DEB),对丁丁基乙苯(p-tBEB)和对丁基乙烯基苯(p-tBVB)。叔丁基苯的转化率随温度的升高而增加,直至300摄氏度,但在此温度以上,它会降低。完全没有邻位和元产物。乙苯是苯乙基化和p-tBEB裂解的产物。在较低的温度下有利于对叔丁基化产物的选择性,而在较高的温度下有利于乙苯选择性。在Al-MCM-41(50)上检查了时间对流的影响,并在本文中讨论了结果。

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