这些香料都是以草酸二乙酯与相应的醇为原料，通过酯交换反应来合成的。
This flavour is synthesized by the ester interchange using diethyl oxalate and relative alcohol as materials.
提出了以高氯酸为催化剂，分析纯乙酸乙酯为介质，乙酰化法测定伯、仲醇的实验条件，实现了对经典方法的改进，简化了操作程。
The experimental condition of acetylating method for determining priminary alcohol and secondary alcohol catalyzed by perchloric acid in the medium of analytically pure ethylacetate is proposed.
由硬脂酸乙酯与蔗糖在无毒溶剂丙二醇存在下进行酯交换反应，合成了硬脂酸蔗糖酯。
The ethyl stearate react with sucrose and to synthesize the sucrose fatty acid ester in the poisonless solvent (propanediol).
介绍了世界乙二醇、精对苯二甲酸、 聚对苯二甲酸乙二酯及其纤维、瓶用树脂等聚酯产业链的生产新动向和需求预测。
The article gives an account of the new production trends and demand forecast of the world's PET industry chain in EG, PTA, PET and its fiber and bottle grade resin.
考察了催化剂处理方式、醇酸比、催化剂用量、反应时间对合成乙酸乙酯的影响及催化剂重复使用的活性。
The effects of catalyst treated methods, catalyst quantity, reaction time, acid-alcohol ratio and catalyst length-of-live are studied in batch synthesis of acetic ether.
由硬脂酸乙酯与蔗糖在无毒溶剂丙二醇存在下进行酯交换反应，合成了硬脂酸蔗糖酯。
The poison methyl alcohol has been replaced by alcohol to react with Stearic acid and to synthesize the ethyl stearate.
采用直接酯化法，将山梨酸与四种醇反应，合成了山梨酸甲酯、乙酯、丙酯、丁酯。
Methyl, ethyl, propyl and butyl sorbates were synthesized by esterification of sorbic acid with four kinds of alcohol respectively.
在气相色谱上，乙酰乙酸甲酯、乙酰乙酸乙酯、3-氧代戊酸甲酯与醇在无任何催化剂存在下，发生酯交换反应。
Gas chromatography(GC) as a chemical reactor, methyl acetoacetate, ethyl acetoacetate, and methyl(3-oxo) pentanoate can undergo transesterfication with various alcohols without any catalyzers.
阐述了乙二醇的几个主要合成方法，着重介绍了合成乙二醇的新技术方法：碳酸亚乙酯法。
The main synthetic methods of ethylene glycol was described. The ethylene glycol was synthesized by ethylene carbonate that is a new method which was importantly introduced.
利用正交试验研究了酯交换法制备卤虾油脂肪酸乙酯的工艺，分析了催化剂用量、反应温度、反应时间、无水乙醇用量等对醇解率的影响。
Meanwhile the influence of the amount of catalyst alkali ethylate and absolute alcohol, the temperature and time of reaction on interesterification was studied.
为了解决这个限制，一个低分子量增塑剂如甘油数量，山梨醇，柠檬酸三乙酯使用。
To remedy this limitation, a number of low molecular weight plasticisers such as glycerol, sorbitol and triethyl citrate are used.
由于环保要求的提高，醇基硅酸乙酯的使用受到限制， 硅溶胶的应用越来越广泛。
The use of alcoholic ethyl silicate would be restricted and the silica sol would be more and more extensive because of the more strict environmental protection requirement.
采用乙酸乙酯为溶剂，粉状活性炭吸附精制异山梨醇粗品，得出适宜的精制条件，其精制品质量符合USP2 4版质量标。
Using ethyl acetate as solvent, isosorbide can be refined with actived carbon, the suitable condition can be obtained and the product quality meets the quality standard of USP24.
在白酒标样分析中，使得乙醛、甲醇、乙酸乙酯的色谱峰能够分开，比现有的聚乙二醇（PEG-20M）柱的分析方法更为便捷。
The separation of methanol, acetaldehyde and ethyl acetate in the standard liquor sample on the monolithic column is much more convenient than that on PEG-20M columns.
为了增强其应用过程中抗穿透、撕裂的能力，采用玻璃纤维或聚萘二酸乙二 醇酯或聚酰亚胺薄膜增强。
Glass fiber or polyethylene naphthalate (PEN) or polyimide film is adopted to strengthen the penetration resistance and the tear resistance in the process of application.
在我们的合成方法中，先从-苯乙醇开始合成了-苯乙基氯，再用丙二酸二乙酯的烯醇盐离子进行亲核取代。
First we synthesized the -phenylethyl chloride from -phenylethyl alcohol. Then it was substituted by enolate anion of diethyl malonate and converted to ester.
木薯淀粉产业：30万吨木薯燃料乙醇项目、柠檬酸、赖氨酸项目，酒精乙烯、环氧乙烷、醇醚、醋酸乙酯等项目。
Cassava starch: project of Producing 300,000t Cassava Ethonel, Citric acid and Lysine, Ethene, EO, ether, acetic acid projects and so on.
干酒中脂肪酸乙酯的相对含量高于冰酒（P〈0．05）；高级醇在冰酒中的相对含量高于干酒（P〈0．05）；
The relative contents of ethyl lactate, ethyl hexanoate, ethyl octanoate, ethyl decanoate, diethyl succinate and monoethyl succinate are higher in sea buckthorn dry wine than in ice wine (P < 0.05) ;
干酒中脂肪酸乙酯的相对含量高于冰酒（P〈0．05）；高级醇在冰酒中的相对含量高于干酒（P〈0．05）；
The relative contents of ethyl lactate, ethyl hexanoate, ethyl octanoate, ethyl decanoate, diethyl succinate and monoethyl succinate are higher in sea buckthorn dry wine than in ice wine (P < 0.05) ;
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