馏分

Based on the shortage of light fractions in Chinese crude oils, ethylene production hasto use various feedstocks.

基于我国原油中轻质馏分油少的特点，我国乙烯生产必须使用多种原料。

The aim of their efforts, an effective catalytic cracker to convert crude oil into gasoline, using a fluidised bed.

这场努力的目标，是使用流化床催化裂化器把原油转化为汽油。因此，第一步就要将原油分割成更易处理的馏分。

With gas chromatographic and mass spectrum analysis technology,the chemical composition of biomass tar and its distillation s were analyzed.

主要采用色谱-质谱联机成分分析法对生物质焦油及其馏分试样进行成分分析。

ASTM D3227-02a Standard Test Method for Sulfur in Gasoline, Kerosine, Aviation Turbine, and Distillate Fuels.

电位差法测定汽油、煤油航空汽轮机燃料及馏分燃料中硫醇态硫含量的试验方法。

The residue is then cooled and acidified with dilute hydrochloric acid. The toluene layer is separated off, washed with water and distilled. Toluene and other low-boiling fractions first distil over and finally pure diethyl phenylmalonate is obtained boiling at 165-166°C, under 20 mm. pressure and having m.p. 16 °C. The yield is 85% of the theoretical.

剩余物冷却然后用稀盐酸酸化，分理出甲苯层，用水洗涤，然后蒸馏，甲苯和其他低沸点馏分先被蒸馏出来，最后获得20毫米压力下沸点为165-166摄氏度的二乙基苯基丙二酸酯，其熔点为16摄氏度，理论收率为85%。

Fractions can be composed from superscripts and/or subscripts plus the fraction slash.

馏分组成可以由上标和/或下标再加上部分斜线。

The naphthenic acids in 200~430℃ distillate of Liaohe crude oil were separated by column chromatogram and anion exchange resin.

采用柱色谱和阴离子交换树脂法分离出辽河200~430℃馏分油中的环烷酸。

Raffinates, steam-cracked C4 fraction cuprous ammonium acetate extn, C3-5 and C3-5 unsatd

含饱和及不饱和C3-5但不含丁二烯的残油，来自蒸汽裂解C4馏分的

Catalytic thermal cracking technology, making use of VGO and residue as feedstock and solid acid catalyst which consists of ZSM-5 zeolite as major activity components, is a new process of producing low-carbon olefines composed of ethylene and propylene mainly under certain condition in FCC plant.

催化热裂解技术是以减压馏分油和渣油为原料，使用以ZSM-5分子筛为主要活性组元的固体酸催化剂，在催化裂化装置上，在一定的工艺条件下生产乙烯和丙烯为主的低碳烯烃的一项新工艺。

Washing oil distillate from coal tar is rich in such valuable organic chemical materials as quinoline,α-methyl-naphthalene,β-methyl-naphthalene, diphenyl, indole, acenaphthene, fluorene, etc.

煤焦油洗油馏分中富含喹啉、α-甲基萘、β-甲基萘、联苯、吲哚、苊、芴等宝贵的基本有机化工原料，介绍了这些组分的分离提取及其在精细化工中的应用，煤焦油的深加工对资源综合利用及精细化工的发展具有重要意义。

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。