ultraresonance screen

The two kinds of overazeotropic process through absorption of NO2 and followed distillation to produce concentrated nitric acid which were developed in Russia and Spain are introduced,followed by comparison on energy consumption and comments on both process.

介绍了俄罗斯和西班牙超共沸酸精馏法制取浓硝酸工艺,对2种工艺进行了能耗比较和评述。

In this paper,the stability of propene is briefly described with hyperconjugation;the activity of α H in propene is explained with inductive effect and conjugative effect:the different elctronegativity between C sp2 and C sp3 ,and the stability of active intermediate——allyl free redical.

通过诱导效应和共轭效应及超共轭效应对丙烯及烯丙基自由基稳定性的分析 ,从理论上解释了丙烯的稳定性及其α-H的活泼性 。