查询词典 purity

So the process is offered using isomerization with separation. 1,2,4-trimethylbenzen is converted to 1,3,5-trimethylbenzen by isomerization. By means of precise distillation mesitylene is separated from products of isomerization as much as possible with high purity. 1,2,4-trimethylbenzen is recycled, at last , more mesitylene is produced and the productive cost is much lower .

为此，本文将催化异构化技术和精密精馏技术结合起来，通过异构化将偏三甲苯转化为均三甲苯，通过精密精馏技术将产物中均三甲苯最大限度的分离出来，得到很高的产品纯度，同时偏三甲苯循环使用，提高了均三甲苯的产量，降低了均三甲苯的生产成本。

Finally, with the language of VB, the process of extractive rectification was simulated with the method of tri-opposite angles matrix and the effect was researched the ratio of raw and solvent, theory plate number and the feed position of raw and the solvent on the purity of mesitylene was studied.

编制VB程序，结合三对角矩阵法模拟萃取精馏过程，并考察了回流比、溶剂比、理论塔板数、溶剂及原料进料位置对萃取分离效果的影响，为下一步的小试提供了数据基础。

Per,the application and production situation of high purity methanol at home and abroad were introduced.

高纯甲醇是一种重要的化工溶剂。

It is a classical chemical process for production of methyl acetate. But by the limits of. the formation of azeotropes in the process,we can't obtain hign purity methyl acetate by normal unit operation.

醋酸甲酯的制备是一种经典的化学过程，但由于反应过程中形成共沸物的限制，通过常规的单元操作不能够得到高纯度的醋酸甲酯。

It is a classical chemical process for production of methyl acetate. But by the limits of. the formation of azeotropes in the process, we cant obtain hign purity methyl acetate by normal unit operation.

醋酸甲酯的制备是一种经典的化学过程，但由于反应过程中形成共沸物的限制，通过常规的单元操作不能够得到高纯度的醋酸甲酯。

Over a solid acid catalyst, the reaction in which methanol and formaldehyde are condensed into mathylal is reversible. This reaction tends to be completion by reactive distillation and the high-purity methylal product can be obtained.

在固体酸催化剂作用下，由甲醇、甲醛缩合生成甲缩醛，该反应为可逆反应，采用催化精馏技术可使反应趋于完全，并得到高纯度甲缩醛产品。

The purity of foreign DNA plays an important role for the success of microinjection.

本文介绍用氯化钠密度梯度离心的方法制备用于显微注射的外源DNA片段。

The purity of MSCs were identified with the spindle-fibroblastic morphology by microphotograph an...

成人骨髓MSCs抑制K562细胞的生长，提示其可能有潜在的抗肿瘤作用，但其作用机制如何有待于进一步探讨。

I take notice that he's fat, bald, and with a pleasing complexion of mildness and purity on his peaceful face.

我注意到他身材肥胖，秃了顶，在他那安详的面容上带着一种讨人喜欢的温和纯朴的表情。

But I might learn something of mindlessness, something of the purity of living in the physical senses and the dignity of living without bias or motive.

但是我可以学到一点儿悠然自得，追随自己的感官需要，不带任何动机，任何偏见，这样单纯而高贵的生活。

Anna: No, I've got a hangover.

不是，我昨晚宿醉了。

We head into the mountains in Su's new Land Cruiser, stop for lunch at a scenic restaurant and then hang around drinking beer and eating fruit as two of his employees attempt to lure the birds with a tape recording of the fowl's mating call.

我们坐上苏的巡逻车向山顶出发，在一家风景优美的餐馆吃了中饭。然后我们喝着啤酒吃着水果四处逛。