distillation 托福GRE专八

1.Studies indicate that chymist coprecipitation annexed azeotropic distillation can better prevent from hard-agglomeration and obtains homodisperse nanoparticle.

研究表明，在共沉淀法中辅以共沸过程，可以较好地防止粉体的硬团聚，得到分散均匀的纳米级超粉体。

2.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,通过精获得对甲氧基苯乙腈,总收率为34.8%。

3.Codistillation is distillation which is performed on mixtures in which the two compounds are not miscible.

共是对由不易混合的两种化合物组成的混合物进行的。

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

详了二氯甲苯异构体精塔系统的工程设计与生产过程。

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

对青叶烷加酸再精或长期贮存,可以提高产品质量。

6.Definition: Nutmeg oil is obtained by steam distillation of the dried and crushed kernels of Myristica fragrans Houtt.

本品为肉豆蔻科植物肉豆蔻树Myristica fragrans Houtt.压碎的新鲜果仁经水气获得的挥发油。

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

摘要节能型乙醇脱水制备无水乙醇的方法主要有4种：共沸精法、萃取精法、吸附法和膜分离法。

8.By fuming with sulfuric-phosphoric acid mixture the residual hydrofluoride was then expelled，and boron was finally determined by curcumin spectrophotometry after distillation.

同时，对所拟溶样条件下所得硼的分析结果是否为全硼问题进行了进一步探，结果证实，所拟溶样条件下硼的测定结果为全硼。

9.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.

通过计算考察了理板数、进料位置、溶剂比、回流比、萃取剂温度等主要影响因素的改变对萃取精过程的影响,为工业应用提供理与实践基础。

10.To prepare Muxiang shunqi oral liquid,steam distillation,diacolation and decoction methods were adopted and compared. The results show that the steam distillation is the best process.

采用水汽提取法、渗漉法和煎煮法制备木香顺气口服液。通过成品的理化性质及薄层色谱的比较,确定水汽提取法为最佳工艺,并确定最佳流程。

11.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,对热偶精塔用于非理想体系的操作特性和节能效果进行了模拟分析与研究。