溶剂

The process includes the following steps: dissolving bromine in halogenated hydrocarbon, dropping the bromine solution into reactant system comprising pentabromo toluene, halogenated hydrocarbon, free radical initiator and hydrogen peroxide at 50-65 deg.c, and heating to 60-78 deg.c for reflux reaction until the reactant system becomes transparent; filtering the resultant to obtain solid product, washing with carbon tetrachloride and water separately and vacuum drying to obtain pentabromo benzyl bromide.

具体步骤为：将五溴甲苯、卤代烃、自由基引发剂和过氧化氢组成的反应体系加入到三颈瓶中，将0.07～0.1mol的溴溶于50ml卤代烃配成溶液，在50-65℃温度下滴加到反应体系中，滴加时间为50-70分钟，然后升温至60-78℃温度下回流反应，至反应体系逐渐变透明，且不再产生气泡时，将所得产物过滤，得到固体产物，分别用CCl 4 和水洗涤，真空干燥，即得到五溴苄基溴；其中，五溴甲苯与溴的摩尔比为1∶0.7-1∶1.0，溴与过氧化氢的摩尔比为1∶1.0-1∶1.4，自由基引发剂加入量为五溴甲苯重量的1-10％，卤代烃的加入量为反应体系体积的40％-100％，所用溶剂可以直接进行下一批反应，不需要更换溶剂或蒸馏提纯。

Celery seed essential oils were extracted for tobacco casing by different methods including supercritical carbon dioxide fluid extraction(SFE-CO_2), simultaneous water distillation-solvent extraction and organic solvent extraction.

应用超临界CO2流体萃取(SFE-CO2)、同步水蒸气蒸馏-溶剂萃取和有机溶剂提取方法提取芹菜籽中的香味成分，对不同提取方法制备的芹菜籽精油进行了得率、制备工艺、闻香评价、化学组成和卷烟加香应用效果等方面的对比研究。

The photoinduced cis-trans isomerization reaction occurs after photo-irradiation of this compound, and the rate of conversion depends strongly on the polarity of solvents used.

八 研究了C5位联有含氮茋的三芳基-2-吡唑啉化合物(TPP15)的光物理行为，发现：该化合物在不同极性溶剂中的荧光量子产率值呈倒钟形状，这与在不同极性溶剂中邻近效应的大小以及吡唑啉环和含氮芪基团间的电子转移的难易程度有关。

Business card printing and membership card making business major movements of hazardous wastes: there are 7 mediumso waste, waste containing chromium, copper-bearing waste, waste containing mercury, lead-containing waste, scrap and waste halogenated organic solvents.

制卡和会员卡制作行业危险废物主要有7种：感光材料废物、含铬废物、含铜废物、含汞废物、含铅废物、废卤化有机溶剂、废有机溶剂。

A study on thermal denaturation of hen egg-white lysozyme was carried out by differential scanning calorimetry and modulated temperature differential scanning calorimetry. It was found that DSC profiles of HEWL were dependent on heating rates and concentrations of enzyme as well as cosolvent.

利用差示扫描量热和温度调制差示扫描量热研究了鸡蛋白溶菌酶在纯水及二甲基亚砜/水混合溶剂中的热变性过程，探讨了酶的浓度、扫描速率和共溶剂的含量对热变性行为的影响规律。

Transition metal borides and inorganic boron-containing compounds, such as TiB〓, BN, B〓C and BP, are one of the most important groups for application in high-temperature performance, electronics and catalysts. Traditionally, they were prepared by high-temperature reactions; however, the products were beyond nanometer scale.

中文题名溶剂热合成硼化物及非金属含硼化合物纳米材料副题名外文题名论文作者谷云乐导师钱逸泰学科专业无机化学研究领域\研究方向学位级别博士学位授予单位中国科学技术大学学位授予日期2003 论文页码总数70页关键词纳米材料硼化物溶剂热合成馆藏号BSLW /2003 /O613 /6 硼化物、非金属含硼化合物功能材料（如硼化钛、氮化硼、碳化硼和磷化硼等）通常具有高硬度、高熔点、机械强度大、高温化学稳定性好等一系列优良性能，有些还具有奇异的光、电、磁、热学性能和催化活性，是一类最富潜力的非氧化物高温结构材料、电子材料和催化材料。

The solvent was removed under vacuum shortly after the addition was compleated and replaced by 1-Methyl-2-pyrrolidinone (5 mL) followed by t-butylamine (5 mL, 47.5 mmol).

加完后真空除去溶剂，然后加入1-甲基-2-吡咯烷酮(5 mL)作为溶剂，再加入叔丁胺。

In the solvent in pigment solvent level (including chemical stability and physical stability) is the key to success or failure of confecting innovativeink.

在溶剂里，颜料的耐溶剂程度（包括化学稳定性和物理稳定性）是配制油墨成败的关键。

Based on the previous experiments, we choose CNTs/CdS core-shell nanowires as inorganic materials and poly(benzyl-ether) dendrons with thiol functionalities as organic solubilizer. The solubility of CNTs/CdS core-shell nanowires in normal solvents was expected to improve through chemical interactions between core-shell nanowires and solubilizer. The enhanced solubility can improve facility in processability. It also provides a new application method in nanomaterials.

本论文在课题组原有工作的基础上，以制备可溶、易加工的有机-无机复合纳米材料为应用目标，选择具有自己课题组研究特色的CNTs/CdS核壳纳米线结构作为无机材料，选择带巯基的聚苯甲醚树枝状分子作为有机增溶剂，通过带巯基的聚苯甲醚树枝状分子对CNTs/CdS核壳纳米线的化学作用，改善了核壳纳米线在常用有机溶剂中的溶解性能，为材料的湿法加工提供了基础，也为类似纳米材料的应用开拓了一种新的方法。

A polyurethane depainting agent which uses dichloromethane as the main raw material was prepared and the optimum recipe for its secondary solvents and activators was found.

最佳配方；漆膜；二氯甲烷；溶剂；脱除；技术开发；聚氨酯；活化剂；脱漆剂；深度加工；研制了以二氯甲烷为主原料的聚氨酯脱漆剂，并筛选出其中次溶剂、活化剂等的最佳配方。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！