查询词典 methyl

It was concluded from the calculation that the results were satisfactory and the ratio of reflux to methyl acetate feed had less influence on the conversion of methyl acetate. It is good guide to the pilot experiment, and can provide the basis for the industrial design.

通过模拟计算得出了增大回流进料比不能有效强化醋酸甲酯水解的催化精馏过程的结论，为中试过程提供了有效的指导，也给工业化提供了依据。

The results showed that the optimum conditions were as follows: methyl alcohol as the solvent, the ratio of oil to methyl alcohol 1:2.0, extraction temperature 32℃, extracting 4 times for once 10min.

通过实验得到的最佳工艺条件为：以甲醇为溶剂，油与甲醇比为1：2.0，温度32℃，萃取次数4次，每次萃取时间10min。

However, it is to be noted that activity of sodium hydroxide with respect to the ester exchange reaction is not sufficient, and in order to improve the conversion rate of the waste edible oil to 90%, it is necessary to add methyl alcohol (stoichiometrically required amount of methyl alcohol is about 3 mole with respect to 1 mole of vegetable oil) and catalyst excessively.

不过，这是必须指出的活动氢氧化钠与尊重向酯交换反应是不足够的，并且为了提高转换率的废油脂至90 ％，这是必要的添加甲醇（ stoichiometrically要求金额甲醇约3摩尔与尊重，以1摩尔植物油）和催化剂过分。

GC ECD method was used to analyze the concentration of methyl chloride in atmospheric samples collected from different latitude. The experimental results show that the atmospheric concentrations of methyl chloride show a tendency to decrease towards the poles.

用GC ECD的方法对不同纬度氯甲烷浓度的分析研究表明，大气中氯甲烷的全球浓度表现出从赤道向两级递减的趋势。

DMC is a green chemical industry product which rapidly developed in the recent years, it can substitute for the organic chemical basic raw material such as the bigger toxic carbonyl chloride, methyl chloride, methyl chloroformate and so on, it is vital significance to the environmental protection.

碳酸二甲酯是近年来迅速发展起来的环境调和型绿色化工产品，它是可用于替代毒性较大的光气、氯甲烷、氯甲酸甲酯等物质的有机化工基本原料，对于环境保护具有重要意义。

Separation and recovery process principles of tail gases in producing dimethyl phosphite were introduced; Separation and recovery courses of hydrogen chloride and methyl chloride in tail gases were also analyzed. The percent recovery for hydrogen chloride and methyl chloride is over 99.9% and 93%, respectively, by using the process of combining stage recycle of solvent with lower temperature.

介绍了亚磷酸二甲酯生产中尾气回收的工艺原理，对尾气中氯化氢及氯甲烷的分离回收过程进行了分析；提出了采用吸收剂分段循环和降温相结合的回收工艺，将此工艺应用于3万t/a的亚磷酸二甲酯的生产装置的尾气回收上，可使氯化氢的回收率达99.9%，氯甲烷的回收率达93%以上，盐酸质量分数大于30%，尾气中氯甲烷的质量分数小于5%。

In our country, the acetone is mainly used to produce solvent, acetone cyanide alcohol / methyl methacrylate, methyl isobutyl ketone, bisphenol A, medicines and rubber additives.

国内丙酮主要用于溶剂、丙酮氰醇/甲基丙烯酸甲酯、甲基异丁基酮、双酚A、医药以及橡胶助剂等。

We described that the nitro group is a stronger electron withdrawing and meta activating characters than the imide group, the amino and hydroxy are both electron donating groups and had ortho, para activating characters. The methyl group might have a steric hindrance effect in this reaction. Our results indicated that methyl group at the ortho position of the amino group on the benzene ring, the steric hindrance effect became stronger.

另一方面，由产率上的结果来看，可以得知硝基为强力的拉电子基团，会减少邻位和对位胺基的电子密度比间位多；而氢氧基与胺基是供电子基团，会增加邻位和对位胺基的电子密度比间位多；甲基取代对反应则只有立体障碍的影响，而且与反应的氨基成邻位存在下影响最大。

The four fluorescence peaks are generated separately by the combined actions of the methyl parathion and the acetone. In methyl parathion molecule, there are the transition of n electrons in nitryl, the transition of π electronic structure formed by the oxygen atom and the benzene ring and the transition of n electrons in P=O group. In acetone molecule, there is the transition of n electrons in C=O group.

分析得到，四处荧光峰分别是溶剂丙酮分子中C=O上的n电子跃迁、硝基上的n电子跃迁、甲基对硫磷分子中氧原子与苯环形成的大共轭π电子结构跃迁以及P=S上的n电子跃迁共同作用产生。

The phase separation behavior of different nonsolvent additives (methyl ethyl ketone, glycol methyl ether and diethylene glycol) on PPESK casting solution was studied at 20℃according the linerized cloud point correlation.

结合线性浊点关系，根据浊点滴定试验，通过三元相图研究了20℃下非溶剂添加剂(丁酮，乙二醇甲醚，一缩二乙二醇)对PPESK铸膜液体系的相分离行为。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。