查询词典 reaction

The better technology has been obtained: taking water-EG as solvent 2-imidazolidinone was prepared. The molar ratio of the methanal (36%) to the formic acid (85%) is 1:2.8, reaction temperature is 95~100℃, reaction time is 16 h, taking cuprous chloride and triethylamine as catalyst, the molar ratio of the cuprous chloride and triethylamin to 2-imidazolidinone is 1.0% while 1,3-DMI was prepared.

较佳工艺条件为：制备2-咪唑啉酮时，以水－乙二醇混合作溶剂；制备1，3-DMI时，甲醛(36%)：甲酸(85%)摩尔比为1：2.8，反应温度95~100℃，反应时间16 h，氯化亚铜和三乙胺作催化剂，用量分别是2-咪唑啉酮摩尔数的1.0%。

The results showed that the optimal parameters of transesterification reaction were: molar ratio of methyl acetate to oil 14:1, 30% enzyme added based on oil weight, temperature 40℃ and reaction time 14 h.

研究结果表明，最佳酯交换条件为：脂肪酶Novozym 435加入量为棉籽油质量的30%，乙酸甲酯和棉籽油的摩尔比14：1，反应温度40℃，反应时间14 h。

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 invention discloses a method for synthesizing acetyl tributyl citrate, which uses tributyl citrate and acetic anhydride as reaction articles, uses naphthalenesulfonic acid methylal as the catalyst during the ester synthesis process, filtering the catalyst from reacted articles after reaction, water-washing, alkaline-washing, distilling the filtrate to obatin acetyl tributyl citrate.

本发明公开了一种合成乙酰柠檬酸三丁酯的方法，它以柠檬酸三丁酯、乙酸酐为反应物，在酯合成过程中用萘磺酸甲缩醛作催化剂，反应结束后，将催化剂从反应后的物料中过滤出来，滤液经水洗、碱洗、蒸馏获得乙酰柠檬酸三丁酯。

Density functional theory was applied to investigate the gas-phase reaction mechanism of chromium hydride removing from reaction of chromium cation and methylamine.

利用密度泛函理论重点研究了Cr+与CH3NH2反应生成CrH的气相反应机理。

The ab initio calculations have been performed on the reaction paths of 1, 1- and 1, 2-dehydrogenation of methylamine by the Intrinsic Reaction Coordinate method.

东北师范大学化学系。长春(130024)摘要：本文用内禀反应坐标法对甲胺的1，1-和1，2-脱氢反应途径进行了微观动力学解析。

The reaction of methyl bromide with methylamine to give dimethylammonium bromide is a typical SN2 reaction that shows second-order kinetics.

答：甲基溴与甲胺反应得到二甲基溴胺是一个典型的SN2反应，是动力学二级反应。

The influence of the amount of catalyst, reaction temperature, molar ratio of β-methylnaphthalene and olefins, reaction time and the amount of solvent has also been studied in detail.

详细考察了三氯化铝催化剂用量、反应温度、芳烯物质的量比、反应时间及溶剂用量对β-甲基萘与长链烯烃烷基化的影响。

A simple temperature-controlling microwave reaction apparatus was designed by using the domestic microwave oven and was used to study the carboxymethylation reaction of chitosan.

微波加热近年来被广泛应用在化学合成中[1-5]。

The effect of reaction temperature, reaction time and mineralizer concentrations on ZnS particles was discussed.

讨论了反应温度，反应时间，矿化剂浓度对ZnS纳米粒子尺寸和形貌的影响。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。