distillation GRE专八托福

the distillation of water.

水的净化

fractional distillation

分, 分解(法)

essential oils obtained by distillation or expression.

通过或压榨提炼的香精油。

The refined product with high purity is obtained by vacuum distillation of crude benzal chloride.

将制得的苄叉二氯粗品进行真空精得到高纯度的精品;

Conclusion Comparing with those of steam distillation,the contents of undecane,nonane increased by SPME;

结论与水气法比,固微萃取法得到的十一烷、壬烷等烷烃的含量增加;

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。

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精塔系统的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。

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。

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。

The troubles with liquid distributor in distillation tower in oxozone production are analyzed. Improving measures are put forward.

介绍双氧水生产中精塔内液体分布器在生产操作中存在的问题,并提出了改进措施。

Conclusion: Comparing with those of steam distillation, the contents of undecane、nonane、α-Cubebene increased by SPME;

结果：与水气法比，固微萃取法得到的十一烷、壬烷、α-荜澄茄油烯等的含量增加；

The energy consumption of azeotropy distillation was low but its energy-saving effects were inferior to that by multiple-effects extraction distillation.

共沸精法能耗低,节能效果不如多效萃取精,共沸精和多效萃取精都需对塔压进行控制;

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细粉体。

Traditional steaming and distillation in the production of alcohol with amylum as raw materials have disadvantages such as higher consumption of energy and inequable gelatinization quality for amylum.

用淀粉原料生产酒精,传统的煮工艺能源消耗很高,淀粉糊化质量参差不齐;

During the course of the experiment, the student will be exposed to fractional distillation under vacuum, gas chromatography, refractometry, polarimetry, and IR absorption spectroscopy.

气色层分析，折光率的测定，旋光度的测定和红外吸收光谱。

The water distillation-extractor was used for extracting the volatile oil of Sagina japonica.The average volatile oil yield obtained was0.08%;

采用水气方法提取漆姑草挥发油,测得漆姑草挥发油的含量为0.08%;