How can a laboratory refine and purify small amounts of crude ethylene gas through distillation?
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We have now collected about 10 liters of crude ethylene gas in the laboratory using the ethanol dehydration method. Of these, the ethylene content is around 96%, while other impurity gases including ethane, propane, ether, acetaldehyde, butylene, etc., account for about 4% in total. I now want to purify this approximately 10L volume of crude ethylene gas in the laboratory to achieve a purity level suitable for polymerization, with a purity requirement of over 99.9%. Is there any good way? What distillation equipment can be used to achieve the goal?
For the distillation and purification of small amounts of crude ethylene gas, the following methods can be considered: 1. Conventional distillation: Using conventional distillation equipment, such as simple towers or segmented towers, to achieve separation through the difference in boiling points of various components. By gradually increasing the temperature based on the differences in boiling points of ethylene and other impurities, the purified product within different boiling point ranges is collected. 2. Efficient distillation: Use more advanced distillation equipment, such as distillation columns or counter-current cryogenic towers. By utilizing different fractionation zones and internal structures, the separation efficiency can be further improved, resulting in a higher degree of purification. 3. Liquid extraction: An appropriate solvent is used to extract ethylene and other impurities from the gas phase into the liquid phase. The resulting solution is then processed through methods such as distillation to obtain pure ethylene. 4. Adsorbent method: Utilize specific adsorbents (such as activated carbon or molecular sieves) to adsorb and remove impurities. By selecting different adsorbents, selective adsorption of ethylene and other gases can be achieved to achieve purification. The appropriate method needs to be chosen based on the specific conditions and resources of the laboratory. For the production of ethylene with higher purity, multiple methods can be combined to achieve the desired purity levels. .
Does anyone who is an expert in distillation know what should be done?
In atmospheric distillation, how can crude ethylene be liquefied first? A very low temperature is required! It needs to be many degrees below the normal boiling point of ethylene. The energy consumption is very high! Is there a better method that is more advanced, has lower energy consumption, and can purify ethylene to 99.9% purity? :handshake
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