分馏

Comparative taste profile analysis using the model chicken broth as savory matrix, followed by LC-MS and NMR experiments, led to the discovery of the kokumi principle in subfraction IV/10 as .

使用鸡汤作为含香基质，对比性味觉概况分析按照 C-MS 和 NMR 实验进行，在子馏分 IV/10 中发现 kokumi 原理是。

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

Comparing with marine oils in the adjacent areas, all crude oils in Hade 4 oil field (except for HD401 well) have following peculiarity: very similar in the composition of light hydrocarbon fraction, and the distribution of of phytane-series isoprenoid alkanes, high concentration in steranes, terpanes and their aromatized compounds, as well as rearranged steranes; low concentration of gammacerane, 24-norcholestanes and 24-rearranged steranes, and low C〓 regular steranes C〓/(C〓+C〓+C〓＜20%; 3-methyl steranes and 27-norcholestane predominated, respectively; very low concentration of dinosterane and 4-methyl steroid.

分析表明，与相邻地区海相原油比较，除最南端的HD401井原油外，其它井区原油均具有下述特点：轻烃馏分组成十分接近、植烷系列类异戊烯烷烃分布较为一致、甾萜类和芳香甾萜类环状化合物浓度较高、重排甾烷丰度较高、伽马蜡烷含量低、规则甾烷组成中C〓丰度低C〓/(C〓+C〓+C〓＜20％、甲基甾烷中以3-甲基甾烷为主、甲藻甾烷和4-甲基甾烷丰度极低、降胆甾烷中以27-降胆甾烷为主、24-降胆甾烷和24-重排降胆甾烷丰度低。

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。

At present, diesel oil plays a more and more important role in the various kinds of fuel. But compare to gasoline, diesel oil has a high rate of sulfur compound. The sulfur compound is existed mainly as thiphene and thiphene ramification. These kinds of sulfur compounds are not easy to remove by adding hydrogenation. Thats why diesel oil has a high rate of sulfur compound. So it makes profound desulfurization a hot topic and a difficult problem in and outside the country. This paper takes dibenzonthiophene as a model to study the profound desulfurization of diesel oil with the help of biology and the oxygenating desulfurization under the condition of ultrasonic and microwave.

目前，柴油在燃料油中占的比重越来越大，而柴油较汽油馏分重，其硫化物主要以噻吩及噻吩衍生物的形式存在，这类硫化物用加氢的方法难以脱除，使柴油的含硫量较高，因此柴油的深度脱硫是国内外研究的热点和难点，本文以二苯并噻吩作为模型化合物，考察微生物的协同条件下对柴油的深度脱硫，超声波条件和微波条件下的氧化脱硫，并对超声波条件和微波条件下柴油的深度脱硫进行了对比。

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。

The oil yield of six types of Huadian oil shales were measured on a Fischer assay retort,and the factors which effected the results of Fischer assay of oil shale were investigated,such as heating rate,particle size,final retorting temperature and retorting persistent time.

结果表明，页岩油的产率随着挥发分含量的增大而增加，在一定范围内提高升温速率，页岩油产率增大，但升温速率过快，反而使页岩油产率降低；终温在500℃~510℃，持温时间20 min的条件下，产油率最高，继续增加干馏终温和持续时间对产油率影响不大；同时适宜的粒度可以适当提高页岩油的产率。

Petroleum as it is found in the earth is a combination of several fractions.

地下发现的石油是由几种馏分组成的混合物。

Each of the fractions is still a mixture of many different compounds.

每一种馏分仍然是许多不同化合物的混合物。

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。

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。