查询词典 nitration

Students should grasp the classification of the nitration reactions and its industrial application, the main nitration reagents and the nitration method, the classification of the sulfonation reactions, the function of sulfo group and its in the industrial application, sulfonating agents and its industrial application, the separation method for the sulfonated compounds, the widespread applicationof diazonium and the coupled reactions and its in the industry specially employed in the dyes and the pigments synthesis

掌握硝化反应的分类及其在工业上的应用。掌握主要的硝化试剂和硝化方法。掌握磺化反应得分类、磺酸基的作用及其在工业上的应用。掌握磺化剂其在工业上的应用。了解磺化物得分离方法。掌握重氮化及偶合反应及其在工业上特别是在染料和颜料合成中的广泛应用。

Its main synthesis method is nitration of guaiacol by fuming nitric acid and glacial acetic acid as nitration agent.

它的合成目前主要采用愈创木酚硝化法，以发烟硝酸和冰醋酸混酸做硝化剂。

The para-/ortho- product isomer ratio is 6.2 for the nitration of chlorobenzene at 18℃ for 8h with n/n(NH4NO3)=5. The para-/ortho- product isomer ratio is 14.0 for the nitration of bromobenzene at 0℃ for 8h with n/n(NH4NO3)=5. The pars-product, p-nitrobromobenzene, from the nitration of bromobenzene in [HSO4] under 0℃ precipitates with 98% purity, which facilitates the separation of the pure isomert.

其中氯苯在18℃下反应8h，三氟乙酸酐/硝酸铵为4时产物的对邻比达到6.2，而溴苯在0℃下反应8h，TFAA/硝酸铵为5时产物的对邻比可达到14.0，并且生成的对硝基溴苯可以从反应液中析出，得到对硝基溴苯含量为98%的产物。

Prolonging nitration time and increasing reaction temperature would promote the formation of dinitro products while shortening the nitration time and decreasing reaction temperature would promote the formation of mono-nitro products.

延长反应时间和提高反应温度有利于二硝化产物的形成，缩短反应时间和降低反应温度有利于单硝化产物的形成。

The effects of all kinds of factors, just like calcination temperature of niobic acid catalysts, nitration reaction time, nitration reaction temperature, recovered catalyst, acetic anhydride and concentration of nitric acid were studied by gas chromatography.

研究了催化剂焙烧温度、硝化反应时间、硝化反应温度、有无醋酸存在、硝酸浓度、催化剂的重复使用等因素对甲苯硝化反应影响。

The article combines domestic and international research, mix from small environment theory, microbiology theory the generation mechanism that intermediate child theory just faces synchronous nitration to turn over nitrify undertook summing up, analysed synchronous nitration to turn over the implementation condition of nitrify and influencing factor.

文章结合国内外探究，从微环境理论、微生物学理论和中间产物理论方面对同步硝化反硝化的产生气理进行了综述，并分析了同步硝化反硝化的实现条件和影响因素。

The results show high selectivity when the temperature is controlled at 50 CC , and the nitrated reaction time is 90 mm, toluene is nitrated by using 95% nitric acid as nitrating reagent at the presence of acetic anhydride, 1.0g silicotungstic acid catalyst is calcinated at 300℃ for 1.5h. The o/p (ratio of ortho to paro isomer of toluene nitration) ratio is 0.89 in product distribution of toluene nitration, lower than 1.67 using sulfonitric acid as catalyst. The yield of products is 91.6%.

结果表明，在醋酐存在条件下，以CCl4为溶剂，以质量分数为95%的硝酸为硝化剂，反应温度控制在50℃，反应60 min， 1.0g经300℃焙烧1.5h后的硅钨酸催化剂，对甲苯表现出强的区城选择性，甲苯硝化产物o/p值（甲苯硝化产物邻位和对位异构体的质量比）达0.89，较硝硫混酸的1.67显著降低，产物收率达到91.6%。

It was also found that protein tyrosine nitration could induce cell injury further. Tyrosine nitration induced by high glucose was different from extrinsic factors. It could be speculated that protein was nitrated selectively to generate nitrotyrosine in diabetic vascular complications.

研究发现：蛋白质硝化可以进一步加强细胞损伤的程度，而高浓度的糖和外源性硝化试剂导致的细胞蛋白硝化有所不同，其原因可能是在糖尿病血管并发症中蛋白质是有选择地发生硝化反应的。

The results showed that BSA could be nitrated and oxidized by hemin-NO2--H2O2 system in all tested buffers, and the pH influence on BSA nitration was contrary to that of BSA oxidation: in pH range of 6.0-8.0, protein nitration was decreased with the increasing of pH, while protein oxidation was significantly increased.

实验结果表明，在五种缓冲溶液中，氯高铁血红素均能够有效催化NO2--H2O2体系引起的牛血清白蛋白的硝化和氧化，并且其导致的BSA硝化程度和氧化程度随pH值变化趋势相反：硝化程度随pH值的升高而降低；氧化程度随pH的升高而升高。

Learn nitration ability of violet acid, preparation of violet acid, nitration operation, the separate of nitratoin production and the disposal of waste acid.

了解混酸的硝化能力及混酸配制、硝化操作，硝化产物的分离及废酸处理。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。