查询词典 solvent

Electropolar solvent such as THF may destroy the polyetherimide layer,while non-electropolar solvent such as petroleum ether cannot solve vinyl acetic acid cobalt.

极性溶剂如四氢呋喃会溶解PEI层，而非极性溶剂如石油醚又不能溶解丁烯酸钴。

Solvent-based alkaline media preferably contain organic amines, especially alkanolamines such as ethanolamine in an organic solvent.

溶剂型碱性介质中最好含有有机胺，特别是诸如乙醇胺醇胺在有机溶剂中。

Using ethylamine as a preswelling agent, a detailed study of the effect of solvent, amount of amine added, reaction time has been carried out. Among these the dielectric constant of the solvent has been found to be the most important factor.

以乙胺为预撑剂，详细考察了溶剂、胺的加入量、反应时间等因素的影响，发现溶剂的介电常数是影响这类晶体剥离和嵌入的最重要的因素。

In this paper, according to Fick's laws, a mathematical model of solvent diffusion in dry-jet wet-spinning process was established, and equations which can describe the solvent concentration distribution were derived.

通过Fick定律建立了纺丝液溶剂扩散的数学模型，得出了溶剂沿纤维原丝的径向分布，还讨论了各种因素对溶剂质量分数分布的影响。

So it has made the great progress. The method studied in this research from o-Dichlorobenzene is a ideal route to synthesize 2,4- dichlorofluorobenzene, which has temperate condition easy to control,safe process,low cost and good quality of products; The method of Phase transfer catalysis fluorination without solvent is better than present technology in presence of DMSO as solvent in many aspects; In a word,it is worth being promoted by the domestic correlative factories.

本课题所研究的以邻二氯苯为原料的2，4-二氯氟苯合成路线反应条件温和，工艺容易控制，生产安全，而且产品质量好，是比较理想的合成路线；以季胺盐为催化剂的无溶剂相转移催化氟化法与溶剂法相比具有明显的优势；通过实验确定的工艺条件对工业化生产有重要的指导意义，可提高以邻二氯苯为原料的工艺路线的市场竞争力。

The best yields are obtained if the ether solvent is distilled from the Grignard under vacuum and replaced with hydrocarbon solvent, such as benzene.

最好的产量得到醚溶剂，如果是从格氏蒸馏真空和烃类溶剂，如苯，取代。

The optimum temperature is 35℃ when solvent is hexane and 30℃ when solvent is butylacetate.

以已烷为溶剂时，最佳温度为 35℃，以乙酸丁酯为溶剂时，最佳温度为30℃。

Comparison of extracting temperature, solvent type, solvent-mycelial ratio and extracting time in water bath, the optimum extraction condition was determined as follows: immerge the mycelia powder in 5 time volume of 50% ethanol, reeling extraction at 50℃ for 60 minutes.

从不同水浴温度、浸提溶剂、浸提比例和浸提时间对核苷类物质影响的正交试验结果中可以发现，上述各个因素对核苷类物质的提取均有显著的影响。

Solvent extraction is accomplished by the addition of an immiscible solvent to the wastewater.

溶剂萃取是向废水中投加不溶于水的溶剂。

Because the carbonyl in its structure is with strongly absorb-electron effect, so it is a kind of non-proton polarity solvent with high boiling point, high flash point and low melting point, use conveniently for many processing operation such as filtration, distillation, solvent extraction, and so on; it is with very low toxicity, so the harm to human body is inappreciable, and reduce the environment pollution; due to its very strong dissolvability, it can dissolve organic matter, inorganic matter, resin, polymer, etc., and activate all kinds of reagent, mix to dissolve the other high boiling point solvents; it is with very good stability, it is stable under the hot strong alkali and acidity condition, it is with water-resistance and light, oxygen stability.

246℃ m.p：—20℃闪点121℃ flash point： 121℃分子式：C6H12N2O molecular formula： C6H12N2O 分子量128.18 molecular weight： 128.18 二、DMPU的化学性质 Chemical character of DMPU 其结构中由于羰基具有强烈的吸电子效应，因而它是一种非质子的极性溶剂，具有高沸点、高闪点、低熔点，在过滤、蒸馏、溶剂萃取等工艺操作中使用方便；毒性极低，对人体危害微不足道，也减少了对环境的污染；由于它具有极强的溶解性，能溶解有机物、无机物、树脂、聚合物等，并对各种试剂具有活化性质，还能与其它高沸点溶剂混溶；具有极好的稳定性，在热的强碱和酸性条件下都很稳定，还具有耐水性及对光、氧的稳定性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。