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- The effects of pH、temperature and time of reaction on the ace-tyl contents of corn starch acetate were studied. 以玉米淀粉为原料、醋酸酐为改性剂,在水相体系中、碱性条件下合成了低取代度的玉米淀粉醋酸酯。
- By the computer simuates optimizes the technical process and shortens the time of reaction so as to heighten the turnout. 通过计算机仿真,优化工艺过程和缩短反应时间,提高反应得率。
- The quantity of sulphonating agent,time of reaction and tem-perature in reaction were studied.The best sulphonate condition was founded. 研究了磺化剂用量、磺化反应时间、反应温度对产物的影响,确定了双酚A较佳的磺化工艺条件。
- The temperature and time of reaction,solvent and the constitution of aldehydes have remarkable influences on condensation reaction. 并讨论了反应温度、反应时间、溶剂以及醛的结构对反应产率的影响。
- Meanwhile the influence of the amount of catalyst alkali ethylate and absolute alcohol,the temperature and time of reaction on interesterification was studied. 利用正交试验研究了酯交换法制备卤虾油脂肪酸乙酯的工艺,分析了催化剂用量、反应温度、反应时间、无水乙醇用量等对醇解率的影响。
- The forces of reaction made reform difficult. 反动势力给改革造成了困难。
- And it can be proved by the infrared spectrum.The effects of pH、temperature and time of reaction on the ace-tyl contents of corn starch acetate were studied. 通过红外光谱分析验证了该反应的发生,并探讨了反应介质酸度、温度、时间等反应条件对产品取代度的影响。
- It was a time of great tribulation. 那是一段充满苦难的时期。
- Have you made sure of the time of the train? 火车开车时间你搞清楚了吗?
- It's so changeable at this time of year. 这段时间天气变化无常。
- I'll make sure of the time of the flight. 我要核实一下这班飞机的时间。
- She stopped by just to pass the time of day. 她来串门只是为了打发时间。
- He will never fall away even in time of danger. 他即使在危急时刻也绝不会放弃原则。
- Water is short at this time of year. 每年这个时候缺水。
- His efforts were defeated by the forces of reaction. 他的努力被反动势力挫败。
- The experiment results indicate the optimum condition as follows:the acetic acid is 0.2 mol,the ratio of acetic and n-butanol is 1.3, the quantity of catalyst is 1.0 g,the time of reaction is 30 minutes,the yield of production is 94.09%. 最佳合成条件:以0.;2mol冰乙酸为准;醇酸摩尔比为1
- He played the man in the time of great trouble. 他在极为困难的时候显示出男子汉的气概。
- Moreover, the deactivation process of Pt/ZSM-5 catalyst was studied and the formula between the carbon amount and reaction time of Pt/ZSM-5 catalyst at the beginning of reaction and the formula about the coke velocity were obtained. 研究了Pt/ZSM-5催化剂的积炭失活历程,推导出该催化剂在反应初期的积炭量随反应时间的幂函数形式的关系式和积炭速率式。
- Do the time of the execution of the work suit you? 贵方觉得工程完成期限定得合适吗?
- Have you made certain of the time of the train? 火车开车时间你搞清楚了吗?