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The test results showed that this synthetic kerosene fraction was mainly composed of paraffinic hydrocarbons and monocyclic naphthenic hydrocarbons, besides, only a minor amount of single-ring aromatic hydrocarbons was found, two-ring or three-ring aromatic hydrocarbons were non-detectable.

结果表明，从国产煤F-T合成燃料中截取的煤油馏分主要由链烷烃和一环环烷烃组成，油样中只含有极少的单环芳烃，没有双环和三环芳烃存在。

Selective hydrogenation for pentadiene in FCC C 5 fractions and hydroetherification of tertiary pentanes with methanol were investigated.

采用离子交换法制备了Pd/D0 0 5树脂催化剂，对催化裂化C5 馏分中戊二烯的选择性加氢和叔戊烯与甲醇的临氢醚化反应进行了研究。

A Pd /D005 resin catalyst was prepared by using ion exchangemethod.Selective hydrogenation for pentadiene in FCC C5 fractions and hydroetherification of tertiary pentanes with methanol were investigated.

采用离子交换法制备了Pd/D005树脂催化剂，对催化裂化C5馏分中戊二烯的选择性加氢和叔戊烯与甲醇的临氢醚化反应进行了研究。

A Pd /D005 resin catalyst was prepared by using ion exchange method.Selective hydrogenation for pentadiene in FCC C5 fractions and hydroetherification of tertiary pentanes with methanol were investigated.

摘 要：采用离子交换法制备了Pd/D005树脂催化剂，对催化裂化C5馏分中戊二烯的选择性加氢和叔戊烯与甲醇的临氢醚化反应进行了研究。

The application markets of three kinds of isoolefines(isoprene, cyclopentadiene ,piperylene) from the cracking C5 fractions and their downstream derivatives were reviewed.

着重评述了裂解C5馏分资源中3种异构烯烃(异戊二烯、环戊二烯和间戊二烯)及其下游衍生物的应用市场，并剖析了我国裂解C5资源的利用现状及应用前景。

Even carbon number alkenes, phthalic esters and nitrogen heteroatom-containing components were detected in the elution fractions, while such components were not detected without silica gel column separation, indicating that preseparation is very important for increasing the sensitivity of GC/MS analysis.

各洗脱馏分用GC/MS分析，其可测成分与直接检测相比，多检测出偶碳烯烃、邻苯二甲酸酯类和含氮化合物等，表明合适的预分离对提高GC/MS分析的灵敏度非常重要。

The interference of metal ions Fe(superscript 3+、Cu(superscript 2+)and so on in oil can be eliminated by using hydroxyl amino hydrochloric acid and sulfourea as masking agents.

以盐酸羟胺和硫脲作为掩蔽剂可消除Fe(上标 3+)、Cu(上标 2+)等离子的干扰，对大庆原油与锦西减四线馏分油中的钒进行测定，相对标准偏差不大于3.5%，加标回收率为

The results show that fractions of the hydrogenation residue are suitable for catalyzed cracking materials instead of cracking materials.

结果表明，加氢尾油的馏分不适宜作为裂解原料，可以作为催化裂化的原料。

The low-molecular-weight paraffins and olefins, as found in natural gas and refinery gases, and the simple aromatic hydrocarbons have so far been of the most interest because it is these individual species that can readily be isolated and dealt with.

大量化合物都有望得到、其中许多化合物正在生产。目前我们正在探索如何从石油的重质馏分中提炼数量可观的产品。

All of the other fractions showed only very low activity or were inactive.

其它所有的馏分只有很低的活性或不具活性。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。