精馏

N-methylacetamide was used as entrainer in separating acetic acid from water with extractive distillation ,and the interaction mechanism in this process was studied by using the density functional theory.

文献[1-4]认为萃取精馏分离乙酸水溶液过程中萃取剂与乙酸之间的氢键作用改变了溶液中乙酸和水的活度系数关系，从而改变了两者之间的相对挥发度，使得水和乙酸的分离变得相对容易。

A side stream is recycled to the external feed stream of the column through an equilibrator as an internal feed stream.

塔的一侧线流股经过一个平衡反应器完成平衡反应后，作为内部进料流股与原外部进料混合后重新进入精馏塔内进行分离操作。

The numerical algorithm which can provide better stability,accuracy and efficiency in computing time was developed to solve complex cryogenic distillation problems. A side stream was sent to an equilibrator as an internal feed stream and then mixed with the external feed stream of the column.

塔的一股侧线出料流股经过一个平衡反应器完成平衡反应后，作为内部进料流股，与原外部进料混合后重新进入精馏塔内进行分离操作。

It plans to produce 100000 ton of DME a year. Its technological route: it will use coal as material, adopt etherealization technology, sulfur transferring technology, NHD dehydrated sulfur、dehydrated carbon technology,methane technology,etc.

三、生产规模：年产二甲醚10万吨；技术路线，以煤为原料，采用德士古水煤浆加压气化技术；耐硫全低变变换技术；NHD脱硫、脱碳净化技术；甲烷化技术；浆态床液相合成二甲醚及其配套精馏技术。

Reactive distillation for synthesizing ethyl acetate was taken as an example to demonstrate the proposed simulation and optimization methods.

以合成乙酸乙酯的反应精馏过程为例说明上述模拟和优化方法。

The mass purity of ethylamine, diethylamine and triethylamine were at least 0.995, 0.995 and 0.998 respectively, which meets the commercial requirements.

精馏后产品的质量纯度满足一乙胺不低于0.995，二乙胺不低于0.995，三乙胺不低于0.998的要求。

Extractive distillation; industry process; simulation calculation; experiment research

萃取精馏；工业过程；模拟计算；实验研究

There are some researches about the regular batch extractive distillation, most of which are based on laboratory-scale.

关于常规间歇萃取精馏的研究成果较多，但大多是基于实验室规模的研究。

Solvent selection is the key problem for extractive distillation.

溶剂的选择是萃取精馏的核心。

It is important to study the influence of salt on vaporliquid equilibrium for the extractive distillation with addition of salt.

研究盐对气液平衡的影响，对开发加盐萃取精馏技术非常重要。

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。