P-methoxybenzeneacetonitrile was prepared in 34. 8% yield starting from anisole, via chloromethylation, cyanogenation and fractional distillation.

以苯甲醚为原料,经过氯甲基化,氰化反应后,通过获得对甲氧基苯腈,总收率为34.8%。

Rectification technology is a popular separating technique, which plays a very important role in oik and fats industry.

术是现代物质传递理论在过程工业分离领域中非常重要应用方法。

The quality of green oxane can be up-graded by addition of acid followed by distillation or by p...

对青叶烷加酸再或长期贮存,可以高产品质量。

The distillation system design of isomeric dichlorotoluene and its production process are given in detail in this paper.

详细讨论了二氯甲苯异构体塔系统工程设计与生产过程。

Energy-saving ethanol dehydration techniques to produce dehydrated alcohol mainly included four measures as azeotropy distillation, extraction distillation, absorptive process and membrane separation.

摘要节能型脱水制备无水方法主要有4种：共沸法、萃取法、吸附法和膜分离法。

The separation of three-component system of cyclohexane,cyclo-hexene and benzene by extract rectification with a mixed solvent,comprising hexyl dicyanide and dimethyl acetylamine has been studied.

选用己二腈-二甲基酰胺组成混合溶剂，对环己烷、环己烯和苯组成三元体系进行了萃取。

The main factors that influence the extractive distillation were researched such as the theoretical plate number, feedboard, solvent ratio, reflux ratio, the temperature of solvent.

通过计算考察了理论板数、进料位置、溶剂比、回流比、萃取剂温度等主要影响因素改变对萃取过程影响,为工业应用供理论与实践基础。

With the carbonium 5 separation unit as an example, the operational performance and the energy saving effects of the thermal-ly coupled distillation was simulated and analyzed for the nonideal system.

以碳五分离装置为例,对热偶塔用于非理想体系操作特性和节能效果进行了模拟分析与研究。