查询词典 p-dimethylaminoazo-benzene

Tetrachloroterephthalic acid was prepared by chlorinating terephthalic acid, oleumsolvent and iodine catalyst. Tetrachloroterephthalic acid was acylated by sulphurous oxychloride in the presence of DMF to form tetrachloroterephthaloyl chloride. The acyl chloride product was fluorinated by potassium fluoride and esterified by methanol to synthesize dimethyl tetrafluoroterephthalate. The ester was reduced with potassium borohydride and lithium chloride to give tetrafluoroterephthalyl alcohol. The above product was bromated in the hydrobromic acid to obtain 4-bromomethyl-2,3,5,6-tetrafluoro-benzene methanol. 4-Methyl-2,3,5,-6-tetrafluorobenzene ethanol was obtained by reducing the bromide with magnesium. In the exist of DCC and DMAP, tefluthrin was got by the condensation reaction between 4-methyl-2,3,5,6-tetrafluoro-benzene methanol and-(1RS,3RS)- 3-(2- chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl cycolpropanecar-boxylate acid.

对苯二甲酸与氯气在碘存在下以发烟硫酸为溶剂进行氯化制备四氯对苯二甲酸；再以DMF为催化剂与二氯亚砜反应生成四氯对苯二甲酰氯；以氟化钾为氟化剂，环丁砜为溶剂置换氟化，再与甲醇酯化得到四氟对苯二甲酸甲酯；以KBH4-LiCl为还原剂二甲醚为溶剂反应制得四氟对苯二甲基苄醇；以氯苯为溶剂在溴化氢溶液中溴化得到溴化产物；在乙醇溶液中经镁粉还原得到4-甲基-2，3，5，6-四氟苄醇；甲基苄醇与功夫酸在催化剂二环己基碳二亚胺和4-二甲氨基吡啶作用下缩合得到七氟菊酯，总收率达43.6%。

The isosteric heats of benzene in CoAlPO〓-5 showed a slight variation with the loadings due to the weak interactions between benzene molecules in the channels, which reflected an energetically uniform surface within the CoAlPO〓-5 channels.

苯分子在CoAlPO〓-5分子筛中的等容吸附热随吸附量变化不大，表明CoAlPO〓-5分子筛的孔道比较均匀，且吸附质分子之间的相互作用很弱。

The content of benzene compounds extracted by methane dichloride from the leavy surfaces of trees inside the factory areas reached to 88. 33 mg/kg, the levels of benzene, methylbenzene and dimethylbenzene were 36. 680 mg/kg, 10. 22 mg/kg and 41.43 mg/kg respectively in the coking factories.

厂区内植物叶片表面二氯甲烷提取物中苯系物含量高达88.33mg/kg，其中苯36.680mg/kg，甲苯10.22mg/kg，二甲苯41.43mg/kg。

A dynamic generating toxic gas system and a nose-only exposure system were used for the pharmacokinetic study of inhaled environmental contaminants for benzene, toluene, xylene, ethylbenzene,chlorobenzene, styrene, isopropyl benzene, tetrachloroethylene, nonane and methylcyclohexane in male guinea pig.

用动态配气设备和鼻式吸入方式染毒，采用雄性豚鼠对环境中10种挥发性污染物(苯、甲苯、对二甲苯、乙基苯、氯代苯、苯乙烯、异丙苯、四氯乙烯、甲基环己烷和壬烷混合物)的吸入动力学进行了研究。

The catalytic transformation pathway can change to decrease the yield of hydrogen and yield methyl-contained sulfides such as methyl mercaptan, dimethyl sulfide and dimethyl disulfide, but overlarge concentration of methanol would holdback the transformation of isobutyl mercaptan. The transformation of isobutyl mercaptan was favorable if the volume ratio of methanol and benzene was 0.2.The addition of methanol assume certain effect on the catalytic cracking of di-n-butyl sulfide in solvent benzene but without changing the cracking reaction mechanism of di-n-butyl sulfide.

甲醇也可以使异丁硫醇的催化转化路径发生改变降低硫化氢的产率，生成甲硫醇、甲硫醚及二甲基二硫化物等含甲基硫化物，但甲醇的浓度过高会抑制异丁硫醇的转化，在反应体系中当甲醇的体积占到溶剂苯体积的20%时对异丁硫醇的转化较为有利；甲醇的添加对丁硫醚在溶剂苯中的催化裂化有一定影响，但没有改变丁硫醚的裂解反应历程。

ResultsThe major occupational hazardous factors in the project were coke dust, carbon monoxide, benzopyrene, benzene soluble matter and noise. The detection results showed that MAC of benzopyrene on coke pushed side, TWA of benzene soluble matter of two posts and noise level of coke griddle were overproof the rest were eligible.

结果 该扩建项目主要职业病危害因素是焦炭尘、一氧化碳、苯并芘、苯溶物、噪声等；检测结果示焦侧苯并芘的最高接触浓度、炉盖工、出炉工苯溶物的时间加权平均浓度及输焦振筛的噪声强度超标，其余检测点检测结果均符合国家职业卫生标准。

An approach based on the graph theory is used to study the relationship between bo- iling points of normal alkyl benzene s and its molecular structure,and a quantitative relation is devel- oped which can be used to characterize the structure-property relationship and to prediet the boitingpoints of normal alkyl benzene s.

本文用图论方法探讨了烷基苯的沸点与其分子结构之间的关系，提出一个既能合理表征烷基苯沸点与分子结构关系，又能准确预测沸点的定量关系式。

The adsorption isotherms of benzene and propene at different temperatures and 1× 10－3～5.0 kPa show that at low pressure and high temperature, the loadings of propene are significantly lower than those of benzene.

在压力范围1×10－3～5.0 kPa，不同温度下苯与丙烯在分子筛内吸附等温线的模拟结果表明，在较高温度、较低压力下丙烯的吸附量要小于苯的吸附量。

This paper reports the experimental equipment and technology parameter for the synthesis of diisopropylbenzene and triisopropylbenzene by catalytic alkylation between benzene and propene, the conversion of benzene is more than 98%,the selectivity of diisopropylbenzene and triisopropylbenzene is more than 40% and 36% respectively.

报道了苯与丙烯催化烷基化合成二异丙苯和三异丙苯的实验装置与工艺条件，苯的转化率达98%以上，二异丙苯的选择性≥40%，三异丙苯的选择性≥36%，经分离后可获得纯度≥95%的二异丙苯和三异丙苯产品，所提供的合成工艺基本上无污染，在国内外具有先进的技术。

It takes heavy alkyl benzene as source material to synthesize alkyl benzene sulfonic acid through SO 3 falling film sulfurization technique and neutralization and re allocation.

介绍了以抚顺洗化厂的重烷基苯为原料经切割筛选，采用SO3 降膜式磺化工艺合成出烷基苯磺酸，再经中和、复配，研制出了性能稳定的烷基苯磺酸盐。

Green function defined inphase space differs from one in coordinate space by its struc-ture which exhibits nonlocatity in coordinates and oscillatorybehavior with respect to momenta.

在相空间中定义的Green函数不同于通常坐标空间的Green函数，在结构上显示出对坐标的高度非局域性，而对动量则显示出振荡行为。

The upper front part of a saddle;a saddlebow.

前鞍桥马鞍前面的上部分；前鞍桥