乙酯

The wastewater from gum benzion production contains benzaldehyde, cyanide, gum benzoin and ethyl benzoate. When the cyanide is determined by isonicotinic acidpyrazalon method, the ethyl benzoate is distilled and goes into NaOH absorption liquid with cyanide in the process of predistillation, because its boiling point is low. Thus the absorption liquid produces a great deal of foam and feculence.

摘要］有机化工产品安息香生产废水中含有苯甲醛、氰化物、安息香和苯甲酸乙酯，在用异烟酸吡唑啉酮法对其进行氰化物测定时，由于油酯类的沸点较低，在预蒸馏过程中被蒸出和氰化物一起进入NaOH吸收液，使得吸收液产生大量泡沫和沉淀，严重干扰后续比色测定。

A new type of difunctional initiator (benzyl dibromide, ethyl dibromoacetate) was proposed in this paper and used to synthesize poly based triblock copolymers such as PSt-PBA-PSt, PMMA-PBA-PMMA.

本论文提出一种新型ATRP双官能团引发剂(如α，α-二溴化苄、α，α-二溴乙酸乙酯)，并用聚合反应速度法、GPC法、核磁分析法进行双官能度的验证，并通过两步聚合合成以聚丙烯酸酯为中间嵌段、苯乙烯或甲基丙烯酸甲酯为两端嵌段的ABA型三嵌段共聚物。

The composites were characterized by transmission electron microscopy, dynamic light scattering, differential scanning calorimeter, Fourier transform infrared and X-ray diffraction.

用两步水热法以钛酸丁酯和硅酸乙酯为原料制备了具有高光催化活性的高温稳定的TiO2-SiO2复合纳米粉体。

Methods The propylbridged biferrocenyl substituted pyridazinone was synthesized by the reaction of propylbridged biferrocene with ethyl succinyl chloride, and then condensed with hydrazine hydrate.

双二茂铁丙烷先与丁二酸单乙酯酰氯发生酰化反应，生成的1，4酮酸酯再与水合肼缩合得到含有双二茂铁丙烷的哒嗪酮衍生物。

The maximal yield of ethyl lactate has reached up to 82%.

在适宜的工艺条件下乳酸乙酯的酯化率达到82%。

When lactide was purified byethyl acetate for 4 times, it was pure enough to polymerize to be PLA.

以乙酸乙酯作为重结晶溶剂，当重结晶次数达到四次后，其纯度已达到丙交酯聚合的基本要求。

The company is committed to the wholesale, retail chemical products, including: industrial toluene, xylene, white oil methanol, ethyl, n-butyl, C ketone, butanone, anti-Whitewater, cyclohexanone, etc. methylal more than 40 kinds of products, the average monthly sales volume over 4000 tons.

本公司主要致力于批发，零售化工产品，包括：工业用甲苯，二甲苯，白电油甲醇，乙酯，丁酯，丙酮，丁酮，防白水，环已酮，甲缩醛等40多种产品，平均月销量达4000多吨。

Jiangmen City, Czech Run Chemical Trading Co., Ltd. operating chemical raw materials, mainly toluene, xylene, a rough, crude dimethyl, mixed aromatics, mesitylene, crude Sanjia, mixed dimethoxy, methylal, n-butyl, B ester, n-butyl alcohol, isobutyl alcohol, vinyl acetate, styrene, butyl ether, cyclohexanone, 6 #, 120 #, 200 #, titanium dioxide, phthalic anhydride, DOP, isopropanol for Main Product, Quality Assurance , the price advantage of abundant supply.

江门市捷润化工贸易有限公司经营化工原料，主要为甲苯、二甲苯、粗甲、粗二甲、混合芳烃、三甲苯、粗三甲、混二甲、甲缩醛、正丁酯、乙酯、正丁醇、异丁醇、醋酸乙烯、苯乙烯、丁醚、环己酮、6#、120#、200#、钛白粉、苯酐、DOP、异丙醇为主营产品，质量保证，价格优势，货源充足。

The effects of reaction time and the amount of the catalyst on the ester yield were investigated with sodium bisulfate monohydrate green catalyst.

苯甲酸乙酯制备是典型的有机实验，本文采用自行设计的回流－吸水反应装置，一水硫酸氢钠为绿色催化剂，考察了反应时间、催化剂用量对酯化反应产率的影响。

The analysis of the components and contents of volatile material indicated that fruit of apples treated with 2 and 4ml/kg of ethanol increased the content and kinds of the characteristic volatile and improved flavor and quality in apple, while the fruit treated with 6ml/kg of ethanol produced higher contents of volatile material and developed off-flavor. Fruit of'Yar'pear treated with 2 and 4ml/kg of ethanol increased the sweet taste and aroma, but higher ethanol concentration showed off-flavor.

对苹果挥发性物质成分的分析表明，2及4ml/kg的乙醇处理增加了苹果特征风味挥发性物质的组分及含量，使水果呈现果香和花香，改善了苹果的品质，而6ml/kg的乙醇处理也能增加苹果果香，但由于强烈果香味的乙酸乙酯等组分在所增加的挥发性物质中所占比例较大，果实呈现浓烈的果香，并使果实的在口中的余味较差，在感官评价中稍差。2和4ml/kg的乙醇处理增加鸭梨甜味，并具有清爽的果香味，而高剂量的乙醇处理余味较差。4ml/kg乙醇处理，在挥发性物质组分数量上与对照差异不大，但却使乙醇形成酯类增加，使鸭梨果实呈现浓郁的果香。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。