Do your distillation under high pressure or low pressure.
在高压或低压下进行提纯。
This is important because a high pressure drop would mean that more energy is required to drive the vapour up the distillation column.
这一点很重要，因为如果压力下降太大，就意味着需要更多能量来推动蒸气上升。
The advantage and disadvantage of the five recycling methods, direct heating, direct aqueous vapor, indirect aqueous vapor, reduced pressure distillation, precipitation method, is discussed.
探讨了直接加热法、直接水蒸汽法、间接水蒸汽法、减压蒸馏、酒精沉淀等五种回收方法的优缺点。
It is reveal by GC analysis that the purity of the TMP, treated by reduced pressure distillation and recrystallization in acetic ester, approximates to that of the reagent grade TMP.
GC分析结果表明：采用减压蒸馏及乙酸乙酯重结晶并用的方法精制的TMP纯度接近于试剂级TMP。
The distillation conditions including overhead pressure, reflux ratio for the recovery of 1,2- propylene glycol were studied.
本文还研究了精馏的一些操作条件对1，2-丙二醇精制过程的影响（塔顶压力、回流比等）。
Veratryl alcohol was synthesized through the reduction of sodium borohydride from veratraldehyde with isopropanol as solvent, followed by solvent extraction and distillation under reduced pressure.
以藜芦醛为主要原料、异丙醇为溶剂，经硼氢化钠还原、溶剂萃取、减压精馏得到产物藜芦醇。
This paper introduced a new type and special structured vacuum pump unit suitable for dry type reduced-pressure distillation.
本文介绍适用于干式减压蒸馏的特殊结构真空抽气设备。
In the low pressure distillation columns, the variation of pressure may severely affects the operating performance of the distillation processes.
在低压精馏塔中，塔内压力变化会严重影响精馏塔的操作特性。
An Introduction to a closed water-saving equipment by recycle water, it may resolve the problem of water waste resulted from distillation, circumfluence, negative-pressure filtration, etc.
介绍了一种可解决化学实验室因蒸馏、回馏、减压抽滤等基本操作引起的，大量冷却水流失问题的封闭式循环节水装置。
The reduced pressure distillation experiment on the liquid paraffin was done and the Engler distillation curve was obtained.
进行了石蜡油的减压蒸馏实验，得到了恩氏蒸馏曲线。
The standard method with atmospheric pressure correction for distillation test of coking benzene products is studied. The distillation range of coking benzene products is defined.
研究了焦化苯类产品蒸馏试验的气压补正标准方法，对焦化苯类产品的馏程范围进行了定义。
The high-purity MPC standard sample was obtained by reduced pressure distillation and the removal of minor phenol with dilute sodium hydroxide solution.
反应产物经减压精馏、碱洗、水洗、干燥等精制处理，得到了纯度较高的M PC标准品。
Pressure distillation used in acetaldehyde production can save energy markedly.
将加压蒸馏技术应用于乙醛生产，节能效果显著。
With very good air-tightness, can conduct reaction under negative pressure and easily assemble distillation, reflow device.
有很好的气密性可在负压下反应方便地组装成蒸馏回流装置。
A new hydration process of water and ethylene oxide by reaction distillation to produce glycol in high pressure was studied.
对反应蒸馏法水合环氧乙烷生产乙二醇的工艺进行了模拟。
The article describes a new PSA (Pressure Swing Adsorption) gas separation process for removing and retrieving the valuable components from PVC fractional distillation tail gas.
主要介绍了变压吸附气体分离技术治理PVC分馏尾气并回收其中有效组分的新工艺。
In order to study the evaporation of ethanol-gasoline, experimental investigation had been carried out on distillation range and saturated steam pressure with different ethanol content.
考察了乙醇体积分数对乙醇汽油馏程及饱和蒸汽压的影响，对乙醇汽油的蒸发性进行了研究。
The process flow and production practice of air-distillation and reduced-pressure distillation for tar in Jigang coking plant are introduced.
介绍了济钢焦化厂焦油常、减压蒸馏的工艺流程、生产实践。
Garlic plant volatile was extracted by steam distillation under reduced pressure, and the chemical components were determined by GC-MS analysis.
采用减压水蒸气蒸馏法提取出蒜苗挥发物，用GC - MS法分析鉴定其化学成分。
The headspace gathered more ester compounds in aroma composition than that of reduced pressure distillation.
顶空法富集的芳香成分中酯类化合物含量较减压蒸馏富集法高。
Existing methanol 4-tower distillation process mainly includes pre-distillation column, pressurize distillation column, normal pressure distillation column and recovery column.
现有的甲醇四塔精馏工艺流程主要包括预精馏塔、加压精馏塔、常压精馏塔以及回收塔。
The oil is extracted with suitable solvent from the oil treated with homogenizer. After removing the solvent by reduced pressure distillation, the oil is obtained finally.
本文使用分散机匀浆，利用溶剂提取油料中的油脂，再经减压旋蒸除掉溶剂，得到油脂。
The cause of packing efficiency loss and "efficiency hump" at high-pressure distillation is summarized and analyzed on the basis of the most recently experimental results.
介绍了填料塔高压蒸馏领域的最新研究成果 ，并从压力对体系物理化学性质、流体流动及分布的影响出发 ，分析了压力对填料塔高压蒸馏的影响。
Well-tried function of DMC as an additive on gasoline, covering its octane number, oxygen content, calorific value, vapor pressure, distillation range, freezing point, solubility in water etc.
就碳酸二甲酯对汽油的调合辛烷值、氧含量、热值、蒸汽压、馏程、凝固点、溶水性等性质的影响进行了研究。实验表明，DMC作为汽油添加剂具有良好的前景。
Well-tried function of DMC as an additive on gasoline, covering its octane number, oxygen content, calorific value, vapor pressure, distillation range, freezing point, solubility in water etc.
就碳酸二甲酯对汽油的调合辛烷值、氧含量、热值、蒸汽压、馏程、凝固点、溶水性等性质的影响进行了研究。实验表明，DMC作为汽油添加剂具有良好的前景。
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