查询词典 separation

The merits of this process were easy separation of benzaldehyde no use of chloride compounds and poisonous heavy metal.

该工艺产物分离简便，不使用含氯原料和有害的重金属，苯甲醛可达食品级标准。

In this paper,the detailed preparation process of gas chromatographic column for separating benzene series was introduced,the optimum column temperature and flow rate of carried gas were selected for separation the mixture of cyclohexane,benzene and toluene,and the column performance has been studied in respects to column efficiency and separating size.

本文主要介绍了气相色谱柱的详细制备过程，并以环已烷、苯和甲苯的混合物的分离为例，选择了最佳的操作条件。同时从柱效率和分离度两方面考察了该色谱柱的柱性能。

Through to extract and separate fir benzine extracturm,it is receive bornyl acetate , initially study the separation craft technologies.

通过对巴山冷杉石油醚浸膏的提取分离得到了乙酸龙脑酯，初步探索了其提取分离工艺。

Separation ; extraction distillation ; relative volatility ; benzol chloride

分离；萃取蒸馏；相对挥发度；氯甲苯

Methods 4-Hydroxy- benzonitrile was treated with sodium hydrogen sulfide and anhydrous magnesium chloride in dimethyl formamide to give thioamide, which was then directly cyclized with ethyl 2-chloroacetoacetate without separation to give ethyl 2-(4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(2) in one-pot; then 2 was formylated with Duff reaction adopting hexamethylenetetramine in trifluoroacetic acid to give ethyl 2-(3-formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(3); finally, the target compound was obtained by the treatment of 3 with hydroxylamine hydrochloride and sodium formate in formic acid.

采用"一勺烩"方法，以4-羟基苯甲腈为起始原料，首先与硫氢化钠和无水氯化镁在N，N-二甲基甲酰胺中反应，所得中间体不经分离，直接加入2-氯乙酰乙酸乙酯进行环合反应，得到2-(4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（2）；然后通过六亚甲基四胺/三氟乙酸进行Duff反应，得到2-(3-甲酰基-4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（3）；再经盐酸羟胺/甲酸/甲酸钠体系脱水得到目标化合物。

The experiment showed that this separation method is feasible and benzyl benzoate with purity about 90% and fluorenone products with purity of more than 85% were obtained. Furthermore the effects of tower top pressure, temperatures of tower top and bottom, reflux ratio on product purity were analyzed.

试验表明该方法是切实可行的，并获得了纯度为90%左右的苯甲酸苄酯产品和85%以上的苏酮产品；同时探讨了塔顶压强、塔顶和塔釜温度、回流比变化对产品纯度的影响，获得了试验条件下的最佳操作条件。

In 1932,Berle ＆ Means systematically identified the separation of corporate ownership and management in public corporations.

美国学者Bede和Means于1932年系统地分析了在公众公司中存在的公司所有与公司经营相分离的现象后，在经济学和公司法学中都产生了重大的影响。

The modern corporation, as Berle and Means first mentioned in 1932, is characterized by separation of ownership and control.

Berle 和 Means（1932）首次提出，现代公司的特征是所有权和控制权分离，即股东和代理人之间的委托代理关系由此产生。

With such separation, there will be some divergence between the agent's pursuit of self-serving strategies and those strategies that would enhance the welfare of the principal Berle and

在这种分离下，代理人追逐私利的策略和那些可能增加委托人福利的策略相分歧。

In contrast to what Berle and Means said about the listed corporation confronted with the separation of the ownership and control rights, the modern enterprise has a concentrated equity ownership structure and the large shareholders with the control rights.

与伯利和米恩斯所强调的上市公司面临所有权与经营权分离不同，现代企业的股权相当集中，普遍存在着掌握公司控制权的大股东，由此产生了大股东对中小股东的掠夺行为。

After explaining total design of automated test system for microcircuit , the thesis introduces GPIB standard .

文章在说明了微电路模块自动测试系统的总体设计后，对GPIB标准进行了介绍。

He interceded in my behalf.

他替我说情。