查询词典 p-dimethylaminoazo-benzene

Optimum conditions are as follows: DMF is used as solvent, compound quaternary ammonium salt as catalyst, n(p-nitrochloro benzene):n=1: 1.2, m:m(p-nitrochloro benzene)=4%, m:m(p-nitrochloro benzene)1:1, and reacted under 155~160℃ for 18 h; reduction reaction is carried out in methanol with Raney nickel, which is used as catalyst; the raw product is added an antioxidant, and distilled simply under reduced pressure to obtain 4-fluoroaniline with excellence quality, purity is over 99.5%, total yield is 89.3%.

实验结果表明，氟化反应的最佳条件为：二甲基甲酰胺为溶剂、复合季铵盐为催化剂，n：n=1：1.2，m（催化剂：m=4%，m：m=1：1，于155~160℃下反应18h；还原反应在甲醇中进行，以阮内镍为催化剂；粗产品加入抗氧剂，减压条件下简单蒸馏得高品位的对氟苯胺。

Revealed high benzene electrophilic substitution reactions and not reacted reasons, strengthened the laws of scientific chemical benzene, helps people in-depth research and study of benzene and aromatics of the structure and nature.

揭示了苯容易发生亲电取代反应和不易发生加成反应的原因，增强了苯化学的规律性和科学性，有助于人们深入研究和学习苯乃至芳香烃类的结构和性质。

Results showed that using aluminum trichloride combined catalyst under the conditions of a catalyst dosage of 5%, a benzene/olefin molar ratio of 8, a reaction temperature of 60℃ and a reaction time of 6 h, the yield of alky-benzene reached 19.6% and the quality of the obtained alkylate was significantly improved as compared with coker gas oil.

结果表明，采用三氯化铝复合催化剂，在催化剂质量分数为5%、反应温度60℃、苯烯摩尔比为8、反应时间6 h的条件下，烷基苯收率达到19.6％，烷基化油的质量明显优于焦化柴油。

The tests of heavy metals and residual pesticides in Radix Curcumae show that Cu,Cd,Hg,Pb and As as well as dichlorodiphenyl trichloroethane, benzene hexachloride, pentachloronitro benzene etc.

通过对2002年、2003年郁金GAP基地所产药材的重金属及砷盐和农药残留量的检测，确定采用适合药材检测、GAP认可的《药用植物及制剂进出口绿色行业标准》为检测依据和限量标准。

Using solvent relief absorption gas Chromatography to estimate the concentration of the Benzene and benzene series in the room air.

采用气相色谱法测定室内空气中的苯和苯系物。

Objective To know the current status of the benzene series pollution in the indoor air in newly decorated houses in Beijing and analyze its dynamic changes in order to find the changes rule of benzene series level.

目的调查北京市居室内装修后苯系物的污染状况，分析苯系物浓度随各影响因素的变化，探讨苯系物的动态变化规律。

In this paper,the detailed preparation process of gas chromatographic column for separating benzene series was introduced,the optimum column temperature and flow rate of carried gas were selected for separation the mixture of cyclohexane,benzene and toluene,and the column performance has been studied in respects to column efficiency and separating size.

本文主要介绍了气相色谱柱的详细制备过程，并以环已烷、苯和甲苯的混合物的分离为例，选择了最佳的操作条件。同时从柱效率和分离度两方面考察了该色谱柱的柱性能。

If he were not so careless, he wouldn't have confused benzene with benzene.

如果她不那么粗心大意，他也会把笨混作挥发油用了。

Raw material respect: This week suffers the effect that crude oil, naphtha rises in price, market confidence restores, oil is moved on benzene price; Crude benzole suffers the cooking factory reduction of output, effect that is restricted to produce, output falls, crude benzole price rises considerably and supply of goods is nervous, follow closely of cooking benzene market rises, but suitable anhydride manufacturer receives goods apiration to lose a bit.

原料方面：本周受原油、石脑油价格上涨的影响，市场信心恢复，石油苯价格上调；粗苯受焦化厂减产、限产的影响，产量下降，粗苯价格大幅上升且货源紧张，焦化苯市场紧跟上涨，但偏苯三酸酐厂家接货意愿稍弱。

Benzene nitriles studied included parent benzene nitriles(cinnamonitrile,benzo nitrile,benzeneacetonitrile,isopropyl benzeneacetonitrile) and para-chloro ben zene nitriles(para-chloro cinnamonitrile,para-chloro benzonitrile,para-chloro be nzeneacetonitrile,para-chloroisopropyl benzeneacetonitrile).

所研究的苯腈类化合物包括苯腈类母体化合物(苯丙烯腈、苯甲腈、苯乙腈、异丙基苯乙腈)和对氯苯腈类化合物(对氯苯丙烯腈、对氯苯甲腈、对氯苯乙腈、对氯异丙基苯乙腈)。

The production moved off-Broadway to New York City, where she won the Joseph E. Calloway award for her performance, and was profiled in American Theater Magazine as one of ten young theater artists to watch.

生产提出过百老汇的新的纽约市，在那里她赢得了约瑟夫calloway奖，她的表现，并于异型在美国的战区杂志之一， 10战区的青年艺术家观赏。

It's a risk tradeoff, and I believe that adding test support code usually wins.

这是一个风险的权衡，我相信添加测试代码通常会占上风。