查询词典 catalyst

The effects of the kind and amount of solvent used, reaction time and the amount of catalyst and acetylation reagent on the reaction were studied.

讨论了溶剂体系及用量、反应时间、催化剂用量、酰基化试剂用量等对反应的影响。

In this paper, acetylsalicylic acid has been synthesized by microwave radiation, taking anhydrous sodium carbonate as catalyst.

本论文采用微波方法合成阿司匹林，用无水碳酸钠作催化剂，研究了微波在有机合成中的应用及其加热原理。

A new catalyst for methanol synthesis was prepared by alternant precipitation between acid and alkali.

采用酸-碱交替沉淀法制备了一种新型的低压甲醇合成催化剂。

The effect of ratio of hydroxyl acid, amount of catalyst and reaction time to the yield of sioamyl propionate were investigated.

探讨了醇酸物质的量比、催化剂用量、反应时间对丙酸异戊酯产品收率的影响。

The influences of water carrier, catalyst and the ratio of the acid to the alcohol on esterification were studied.

讨论了带水剂、催化剂、醇酸比等因素对酯合成的影响。

Effects of reaction temperature,reaction time and mole ratio of nitric acid to aromatic hydrocarbons on performance of the catalyst were investigated.

实验结果表明，磷钨酸对低沸点芳烃液相硝化反应具有显著的催化活性，在优化的条件下，苯、甲苯和氯苯的转化率分别为98.0%，99.5%，100.0%。

The factors influencing on the reaction such as dosage of catalyst, molar ratio of acid to alcohol and reaction time were investigated.

考察了催化剂用量、酸醇物质的量比、带水剂用量以及反应时间等因素对产率的影响。

The effects of various amount of molar ratio of acrylic acid to octadecyl alcohol,amount of catalyst and inhibitor,reaction temperature and time on the synthesis were investigated.

研究了丙烯酸与十八醇的摩尔比、催化剂和阻聚剂的质量分数、反应温度及反应时间对反应的影响，并用红外光谱对产物进行了表征。

The result of experiment indicates that the inversion ratio of acid is 89%, product accords with standard of our country, also catalyst can be used repeatedly, which doesn't pollute environment.

结果表明，催化剂用量为醋酸的40%，酸醇摩尔比为1：1.1，反应时间为1.5h，酸的转化率达89%，产品符合国家标准要求，并且催化剂可重复使用，对环境无污染。

The effects of various amount of molar ratio of acrylic acid to octadecyl alcohol, amount of catalyst and inhibitor, reaction temperature and time on the synthesis were investigated. The production was further verified with IR.

研究了丙烯酸与十八醇的摩尔比、催化剂和阻聚剂的质量分数、反应温度及反应时间对反应的影响，并用红外光谱对产物进行了表征。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。