分馏

With this standard method, simultaneous quantification of DMC, MPC, DPC, phenol and anisole can be achieved accurately, which provide the standard methods for evaluation of different catalysts and control of the reaction process. The microwave-aided catalytic technique was applied in the transesterification of DMC and phenol.

分别以苯甲酸乙酯和丙酮为内标物，实现了对酯交换反应塔釜产品和塔顶馏分的同时定量，为评价催化剂活性的高低和工艺条件的优劣提供了标准化分析方法。

It is separated into a few fractions which boil over different ranges of temperature.

它按沸点的几个温度范围分成少数几种馏分。

But because of its high moisture content, high oxygen content and some impurity, biomass tar needs to be purified or modified before using it as bunker oil.

生物质焦油150℃以下下层馏分的主要含量为羧酸类和酚类物质等多种有机化合物，具有较高的综合利用潜力。

The production of value-added products based on butene oligomerization is one of the effective ways to improve the comprehensive utilization of four carbon fraction.

以丁烯齐聚为基础生产高附加值产品是提高碳四馏分化工综合利用率，为企业挖潜增效的有效途径之一。

Raney nickel catalyst was used in hydrogenation of the turpentine and c-pinane,t-pinane,camphene and isocamphane and some other monoterpane s were determined.

用雷尼镍为催化剂对松节油进行了加氢实验，获得顺蒎烷、反蒎烷、莰烷、异莰烷等单萜烷类化合物，采用气相色谱"反吹、微流控"技术的色谱-质谱分析方法，测得了它们的保留时间和质谱图，为进一步研究原油或抽提物轻馏分中单萜烷类化合物的地球化学意义提供了一些基础性数据。

1 M packed with Mellapak SM-250 under vacuum in batch process to obtain fractions rich in such components as pinenes, camphene, limonene as well as p-cymene, terpenol s, respectively.

松轻油先用碱液进行预处理，再用工业SM-250型孔板波纹填料塔(300mm、高10.1m)，以真空间歇操作方式进行一次性精馏分离，分别得到富含蒎烯、莰烯、苧烯及对-伞花烃、萜烯醇等的馏分。

From the gas chrom atography, report th e percentages of lim onene and carvone in

和香芹酮的百分含。用蒸馏法分这些组份的效有多高呢？在任何一个馏

In the ESI+ mode the compound isolated from fraction III/9 showed a pseudo-molecular ion of m/z 261 ([M + 1]+) as well as sodium and potassium adducts with m/z 283 and m/z 299, respectively, thus suggesting a molecular mass of 260 Da.

在 ESI+模式下，从子馏分 III/9中提取出来的化合物分别出现了伪分子离子 m/z 261 ([M + 1]+)和纳钾加合物 m/z 283 and m/z 299，这样就暗示了260 Da 的分子质量。

Demands on middle-distillates selectivity have become increasingly severe; and a key problem to improve catalyst technology is how to achieve objectives for maximum middle-distillates selectivity To assess the catalytic performance of hydrocracking catalysts, a new laboratory method using decane as the model compound was develo...

本文首先建立了一种以正癸烷为模型化合物的微反评价方法，其中微反转化率与中型活性呈线性关系；采用回归方程可以拟合出中间馏分油选择性。

Gas chromatographic analysis for thermal dimerization mixture of pyrolytic C5 fraction was carried out by using capillary column.

用毛细管柱对裂解C5馏分二聚反应混合物进行了色谱分析。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。