Dichloromethane extraction problem
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Hello, seniors: Recently, I used methylene chloride to extract the organic phase in water, and the layers were obviously separated. However, the water content of the extracted organic phase is as high as 5%, while the solubility of water in methylene chloride is only 2% (at 20 degrees Celsius). What is going on?
What is the target substance for extraction? Is it a substance that is miscible with water, resulting in a high water content in methylene chloride after extraction?
The target substance for extraction is iminoethyl acetate, but it contains a lot of acid (HCL). This is also very strange.: The target substance (ethyl iminoacetate) was washed with water and then extracted with dichloromethane, so all the acid in it should be in the water phase, but the result is that the organic phase also contains a lot of acid, and the acidity can reach 2.5
There is an organic phase in methylene chloride, which is no longer pure and its solubility will change. It may also be due to incomplete layering and partial emulsification.
After extraction, it cannot simply be understood as mixing, and the physical and chemical properties will also change accordingly.
The mature equipment of continuous countercurrent extraction or continuous countercurrent washing will make the separation effect very good, that is, the oil will entrain less water and the water will entrain less oil. The effect is very obvious.
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