烯烃

Influences of reaction temperature and space velocity on distribution and composition of the products were investigated.

我国车用汽油的85%来自催化裂化过程，催化裂化汽油在没有采取任何措施或工艺时烯烃的体积分数一般高达40%～60%，远高于35%的汽油新标准。

An improved simple method for carbon-carbon double bond cleavage by silica-supported potassium permanganate was described and a possible mechanism was proposed.

在无有机溶剂做介质的条件下，用硅胶吸附的高锰酸钾氧化6种难溶于水的液态烯烃，得到了双键发生断裂的氧化产物。

ASTM D1159-01 Standard Test Method for Bromine Numbers of Petroleum Distillates and Commercial Aliphatic Olefins by Electrometric Titration.

电化学滴定法测量石油馏分及商用脂族烯烃的溴值试验方法。

Ii is a process with low investment and great profit to use the C5 etherealization product as the blending component of gasoline with high octane number. The C5 fraction is cut from steam cracking and it's diolefins are saturated by selective hydrogenation.

裂解C5馏分选择性加氢饱和二烯烃后，醚化产物作为高辛烷值汽油调合组分是一条投资少、见效快的工艺路线。

The relationship between olefin content in gasoline and exhaust emission of gasoline engine is discussed.

讨论了汽油中的烯烃与发动机排放之间的关系。

Difunctional group reagents, which have metal and heteroatom linked to the olefinic carbon atoms, play an important role in organic synthesis, especially in developing many convenient methods for the stereoselective synthesis of substituted alkenes.

含金属或杂原子的双官能团试剂为取代烯烃的立体选择合成提供了许多方便方法，在有机合成中具有重要作用。

This will permit the production of TAME from the C5 iso-amylenes and some hexyl ethers from lighter C6 iso-olefins.

这将允许生产温驯从C5 iso amylenes 和一些己基的以太从更轻的C6 iso 烯烃。

The study of homogeneous olefin polymerization catalysts has been one of the most active research a...

均相烯烃聚合催化剂的研究是十多年来最活跃的研究领域之一。

Starting with the readily available isatin, two designated key cyclization precurors 25 and 26 were synthesized respectively by 5 steps and 6 steps reactions ,with Wittig reaction and Corey-Chaykorsky reaction as key steps.

以商品可得的吲哚醌为起始原料，分别经过5步和6步以Wittig烯烃化，Corey-Chaykorsky反应为关键步骤的合成路线，得到2个用于的环合反应的前体亚胺25和26。

Therefore, it isthe emphasis to enhance the thermal stability and improve their tolerance of rutheniumcarbene complexes in olefin metathesis at present.

因此，提高钌卡宾配合物的稳定性，改善其对较强配位能力官能团容忍性是目前烯烃交互置换反应研究的重点。

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。