二乙醚

The result of TLC shows that the three plants of Ajuga contain analogical chemical composition. three plants all contain luteolin.A. decumbens and A.nipponensis all contain esdysterone exclude A.dictyocar. But the latter contained higher amount than the former. TLC of A.dictyocar shows more differences. Thin-layer chromatography can sever as evidence to identificate them.

薄层色谱的结果表明，3种药材的乙醚提取液中均含有木犀草素，且化学成分基本一致；除网果筋骨草外，金疮小草和紫背金盘的正丁醇提取液中均含有蜕皮甾酮，而前者的含量较高，网果筋骨草的色谱与其余二种存在较大差异，薄层色谱法可以鉴别这3种药材。

It can be mutually dissolved with water, methanol, ethanol, amyl alcohol, phenol, glycerin and so on.

乙二醇闪点为116℃，沸点为197.6℃，燃点为121℃，常温下为无色透明粘稠液体，易吸潮，与水、甲醇、乙醇、戊醇、苯酚、甘油等互溶，微溶于乙醚。

The synthetic product was identified with mass spectroscopy and IR spectroscopy. The properties of PBZP were dompared with those of two useful photoinitiators, benzoin ethylether and benzophenone.

用质谱与红外光谱对产物作了鉴定，其性能与常用的紫外光敏剂苯偶姻乙醚及二笨甲酮进行了比较。

It hardly dissolves in water, glycol, and does not dissolve in ether, benzene and carbon tetrachloride.

难溶于水、乙二醇，不溶于乙醚、苯和四氯化碳等。

The influence of each condition on the reaction speed and yield was studied, and the optimal conditions were: the ratio of the amount of substance of aromatic amine and heptafluoro-isopropyl iodine was 1:1.1~1.5, the amount of substance of sodium dithionite, sodium bicarbonate, aniline compounds were respectively 1.1~1.3, the amount of substance of phase transfer catalyst TBAB and aniline compounds was 0.05~0.1, the concentration of aniline compound was 0.5~1.0 mol/L, reaction temperature was 10~20 ℃, and the solvent was aether.

最佳结果为：芳胺与七氟异丙基碘的物质的量比1：1.1~1.5，连二亚硫酸钠、碳酸氢钠与苯胺的物质的量分别为1.1~1.3，相转移催化剂四丁基溴化铵与苯胺的物质的量比在0.05~0.1，溶剂总用量使苯胺浓度在0.5~1.0 mol/L；反应温度10~20℃；溶剂采用乙醚。取代基供电子性越强，反应时间越短，产率越高；氨基的对位优先反应，氨基的邻位较难发生反应；且七氟异丙基总是优先取代在芳环电子云密度较高的位置上。

BARIUM CHLORIDE: Melting Point 962'C, It absorbsmoisture in air to form double hydrated salt.

白色晶体，有具毒，易溶于水，不溶于乙醇或乙醚中，氯化钡：熔点962'C，在空气中吸收水份形成二水结晶。

Coking and deactivation of zeolite catalysts in the synthesis of propylene glycol ethyl ether from propylene oxide and ethanol at lower reaction temperature were studied in this thesis.

本文选择反应物与生成物都含有氧原子的自环氧丙烷和乙醇合成丙二醇乙醚作为典型反应，研究较低温度下在沸石催化剂上反应过程中的的积炭失活规律。

Catalytic synthesis of phenetole by ethylation of phenol with diethyl carbonatein fixed bed reactor was investigated.

以碳酸二乙酯为乙基化试剂，与苯酚在气固相条件下催化合成苯乙醚。

Hydro-liquefactions of coal were carried out in a miniautoclave using diphenylmethane and phenetole as model compounds in tetralin solvent.

以二苯甲烷、苯乙醚为煤的模型化合物，以四氢萘为溶剂，进行中高压加氢液化实验，结合产物的气相色谱和质谱分析，考察了SO24-/ZrO2固体酸对煤直接液化的催化作用及加氢液化机理。

Keywords diethyl carbonate;phenol;phenetole;potassium carbonate;active carbon;ethylation;solid base catalyst

碳酸二乙酯；苯酚；苯乙醚；碳酸钾；活性炭；乙基化；固体碱催化剂

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。