分馏的

Vegetable compound wax for emulsion explosive was prepared by mixing vegetable wax with 5th vacuum cuts, 4th foot oil from raw paraffin, crystallite wax and petroleum resin at 120℃ and stirring for 60 minutes. The effect of raw material components on the performance of compound wax was investigated.

以植物蜡与减五线馏分油、减四线蜡下油、微晶蜡和石油树脂为原料，在120℃下加热熔化并搅拌60min条件下，制备了植物型乳化炸药专用复合蜡，并考察了原料组分变化对复合蜡各种性能的影响。

When no more water separates, distill off the solvent and distill the aldimine.

当收集的水不再增加时，将溶剂蒸馏掉，收集醛亚胺馏分。

Deacidification test for lube distillates by a compound solventwas introduced.

一种复合脱酸溶剂被用于润滑油馏分的脱酸实验。

As can be seen in Fig. 5, dipropyl ether will be recovered in the distillate using 1-pentanol, N,N-dimethylformamide and 2-ethoxyethanol as entrainers and butyl propionate is the only entrainer studied that inverts the volatility of the azeotropic mixture.

从图 5可以看出，使用1-戊醇、N，N-二甲基甲酰胺和2-乙氧基乙醇作为共溶剂时二丙醚将在馏分中回收，丙酸丁酯是唯一与共沸混合物挥发性相反的共溶剂。

A piperylene based petroleum resin was modified by the monoolefin fraction from C_5 separation unit.

采用 C5分离装置得到的 C5单烯烃馏分对间戊二烯石油树脂进行改性。

A polarographic procedure is described for the determination of elemental sulfur in petroleum fractions and products.

提出了采用示波极谱法测定馏分油及石油产品中元素硫的方法。

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。

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。

Results showed that the high content of TFs could be obtained by collection the fractions of special zones of column chromatography when crude TFs used as raw material, NAK as adsorbent and the elutes were concentrated by vacuum evaporator and freeze-dried.

结果表明：以茶黄素粗品为原料，NKA为柱填充料，收集解吸液一定区段的馏分，真空浓缩、冷冻干燥，即可制得高含量茶黄素制品，得率为48.04％，茶黄素总量大于15％。

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。

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。