丁烯酸丁酯

During the reaction of alkylation, general contained 0.2%~2.0% butadiene will produce viscous heavy composite materials, which will raise final boiling point of alkylate and decrease octane, what is more, it will react with acid to produce corresponding ester, which will increase the consumption of acid, Therefore, we must remove butadiene by selective hydrogenation, at the same time, it will convert some of 1- butane to 2- butane by isomerization and raise octane of alkylate.

一般含有0.2%~2.0%的丁二烯，其在烷基化反应中，可生成一种分子量很高的粘稠重质迭合物，使烷基化油的干点升高，辛烷值降低，并且它还和酸反应生成相应的酯而加大酸耗量。因此必须经过选择性加氢除掉丁二烯，同时，将部分1-丁烯异构化为2-丁烯，以提高烷基化油的辛烷值。

Water,glycerin,rosa centifolia flower water,butylene glycol,centaurea cyanus flower water,peg-40 hydrogenated castor oil,propylene glycol,ppg-26-buteth-26,phenoxyethanol,methylparaben,sorbic acid,benzophenone-4,pentadecalactone,citrus aurantium dulcisoil,panthenol,menthyl lactate,sodium hydroxide,glycyrrhiza glabraroot extract,aesculus hippocastanumseed extract,citrus aurantium amaraoil,allantoin,limonnene,linalool,blue 1(ci 42090),yellow 5ci 19140

水，甘油，千叶蔷薇花水，丁烯二醇，矢车菊花水，PEG-40氢化蓖麻油，丙二醇，PPG-26-丁醇聚醚-26，苯氧乙醇，对羟基苯甲酸甲酯，山梨酸，二苯甲酮-4，环十五内酯，甜橙油，泛醇，乳酸孟酯，氢氧化钠，甘草根萃取，七叶树籽萃取，苦橙油，尿囊素，柠檬精油，芳樟醇，蓝，黄水：几乎所有护肤品成分第一位都是水。

Cis-3-hexen-1-ol, butyl acetate, ethyl butyrate, hexanal, trans-2-Hexen-1-al, propyl propionate that consists of green leaf volatiles and cymene were the most attractive compounds.

顺-3-己烯醇、乙酸丁酯、丁酸乙酯、丙酸丙酯及伞花烃等对光肩星天牛具有较强的正趋性反应。

Diethyl fumarate was synthesized with fumaric and alcohol as raw materials and sodium acid sulfate as catalyst.

富马酸二乙酯(又名反丁烯二酸二乙酯，Diethylfumarate，简称DEF)是一种用途广泛的有机合成中间体[1，2]。

ConclusionThe main components of essential oils are 2,4-bis(1,1-dimethylethyl) phenol (4.4%), tetradecanoic acid (6.96%), n-hexadecanoic acid (7.69%), 9,12-cctadecadienoic acid (6.37%), hexadecanoic acid-2-hydroxy-1- ethyl ester (4.79%) and octadecanoic acid-2-hydroxy-1- ethyl ester (4.77%), respectively.

结论阿给炭挥发油的主要成分为2，4-二树丁基苯酚（4.4％）、十四酸（6.96％）、n-十六酸（7.69％）、-9，12-十八碳二烯酸（6.37％）、软脂酸-2-羟基-1-羟甲基乙酯（4.79％）、硬脂酸-2-羟基-1-羟甲基乙酯（4.77％）。

Ethyl alcohol, 3-methyl-4-oxo- pentanoic acid, acetic acid butyl ester, 2-methyl-butanoic acid ethyl ester, diethyl phthalate,-2,4-Decadienal were the same volatiles d from the 10 cultivars.

其中共有组6种，为乙醇、3-甲基-4-羰基戊酸、乙酸丁酯、2-甲基丁酸乙酯、邻苯二甲酸二乙酯、-2，4-癸二烯醛。

A four-ball tester was used to evaluate the load carrying and antiwear properties of bismuth dibutyldithiocarbamate,bis-dibutyldithiocarbamates(V7723),sulfurized isobutylene,molybdenum ester non sulfur and phosphorus in a mineral oil respectively and their synergistic effects.

利用四球试验机评价了二丁基二硫代氨基甲酸铋与二丁基二硫代氨基甲酸酯(V7723)、硫化异丁烯和非硫磷钼酸酯添加剂的极压和抗磨性能，以及它们之间的极压和抗磨协同作用。

As superplasticizer , a series of comb-shaped copolymers of polycarboxylic acid were synthesized by polyoxyethylene allyl methyl diether, maleic anhydride, and styrene with different initiators,and esterified with PEO-n.

以聚氧乙烯甲基烯丙基二醚、顺丁烯二酸酐、苯乙烯等为共聚单体，采用不同引发剂，合成了一系列聚羧酸型梳状共聚物超分散剂，并以PEO n单酯化得酯化产物，研究了共聚物的结构、组成、添加量等对水泥粒子分散性能的影响。

The influence factors such as amount of catalyst,molar ratio of maleic anhydride to n-butanol,and reaction time on the yield of dibutyl maleate were discussed.

以La2(SO4)3/SiO2为催化剂，顺丁烯二酸酐和丁醇为原料，合成内增塑剂顺丁烯二酸二丁酯，探讨了催化剂用量，酐醇物质的量比以及反应时间等对收率的影响。

But in fermented juice, the most of volatile components is esters, about 74.92%, the propanoic acid, 2-hydroxy-, butyl ester is 64.36%.

而在诺丽鲜果中脂肪酸是主要的挥发性成分，占总挥发性成分43.34%，十八烯酸就占了20.34%；在诺丽发酵汁中主要的挥发性成分是酯类，占了总挥发性成分的74.92%，而2-羟基丙酸丁酯就占了64.36％。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。