查询词典 chemical synthesis

Description of project: PCC is produced by carbonation, with limestone as raw material. It is mainly used as filler in the manufacturing procedure of rubber, plastics, paper and paints, inks and other industrial produces. Meanwhile, it could be applied to the production of daily chemical products such as tooth powder, toothpaste cosmetics, as well as the organic synthesis, metallurgy, glass, asbestos and ect.

项目概述：轻质碳酸钙是以石灰石为原料，用碳化法制得，主要用于橡胶、塑料、造纸和涂料、油墨等工业中作填充剂，并可用于牙粉、牙膏、化妆品等日用化工制品中，还可以用于有机合成、冶金、玻璃和石棉生产中。

The new research progress in synthesis of p aminophenol by chemical reduction,catalytic hydrogenation,electrochemical reduction and carbonic oxide reduction from nitrobenzene was reviewed.

评述了硝基苯化学还原法、催化加氢法、电化学还原法和一氧化碳还原法等合成对氨基苯酚的最新研究进展，认为对硝基苯还原法新技术的深入研究有利于医药和染料等行业的进一步发展，具有很好的社会和经济效益。

Betulin, a naturally occurring triterpene, available in abundance up to 10% dry weight of bark from white birch bark, seems to be an ideal starting material for the synthesis of betulinic acid.During a discovery effort from natural resources, in order to seek new biologically active compounds, reaearch on chemical modifications of valuable precursors have been demonstrated to be an effective path to resolve the water solubility problem and increase bioavailability.

从自然界寻找先导活性化合物，再进行结构修饰，试图提高其活性，降低其毒副作用，并提高其水溶性，是创新药物的一条重要思路，而且在新药研制中也得到了很好的应用并取得了显著的成绩。

The present invention belongs to the field of chemical technology, and is a kind of supported tungstic acid catalyst for multiphase catalytic oxidation and synthesis of glutar aldehyde from cyclopentene.

本发明属于化工技术领域，是一种新型的环戊烯多相催化氧化合成戊二醛的负载型钨酸催化剂。

Cyclopentene catalytic oxidation synthesis techniques which had good prospect were introduced with great emphasis,and positive significance of establishing large-scaled chemical plant of glutaraldehyde near the locality of raw material specially in north of China,was pointed out.

着重介绍了前景看好的环戊烯催化氧化合成工艺方法，指出在接近原料产地，特别是中国北方地区建立规模化戊二醛生产装置，具有积极的意义。

Diatomite is a suitable raw material for the synthesis of zeolites due to its chemical composition.

对于天然矿物的开发利用一直受到广泛的重视，硅藻土因其本身的化学组成，非常适合于作为合成沸石的原料。

The first asymmetric synthesis of trans-β-hydroxy-γ-butyrolactones:-(3R, 4R, 5S)-4-(1-acetoxy-isopropyl)-3-hydroxy-butyrolactone 65a was achieved starting from isobutylaldehyde through nine steps. The key steps involve the construction of three chiral carbon centers by the Sharpless's asymmetric epoxidation and Substrate directable chemical reaction.

以异丁醛为起始原料，经过九步反应首次设计合成了具有三个手性中心的trans-β-羟基-γ-丁内酯：-（3R，4〓，5S）-4-（1-乙酰氧基-异丙基）-3-羟基-丁内酯65a，关键步骤是Sharpless不对称环氧化和底物定向不对称合成反应。

The synthesis of divinyl liquid crystalline monomer 4-undecenyloyloxybenzoyl-4'-allyloxybenzoyl-p-benzenediol bisate and network polymers was described. The chemical structures of the synthesized monomer and network polymers were confirmed by FT-IR spectrum.

以双烯类液晶单体4-十一烯酰氧基苯甲酸-4'-烯丙氧基苯甲酸对苯二酚双酯为交联剂，通过与聚矽氧烷接枝反应，合成了系列网络聚合物P1~P5。

Natural gas is important chemical material and is used as feed to produce synthesis ammonia,methanol and ethyne .

天然气是化工的重要原料，以天然气为原料生产合成氨、甲醇、乙炔三大产品。

This paper introduced the typical application of glyoxylic acid in the synthesis of fine chemical products and the basic manufacture method.

本文介绍了乙醛酸在精细化学品合成中的典型应用和乙醛酸的基本生产方法，并比较了不同生产方法的各自特点，同时分析了乙醛酸的市场情况，指出了高质量乙醛酸将具有良好的市场前景。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失