What are the reasons why extraction layering is difficult to separate? What if it’s the emulsification mechanism?
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We have encountered difficulties in separating layers during extraction in our production process; we would like to know the real reason What is the mechanism of emulsification?
The choice of extractant is not appropriate; it is partially miscible with the solvent in the original solution
Reply to 1# zongdaxun: Adjust the pH level properly, and add some deionized water!
1. The stirring is too intense； 2. Presence of impurities (this is the most difficult issue; filtering can help, but heterogeneous filtration is very slow) ； 3. The solvent dissolves the product, reducing the density difference between the two phases. Such as water and toluene; if the product dissolves in toluene, then the density of toluene increases and becomes similar to that of water, making it difficult to separate them. In such cases, saturated salt water must be added to increase the density of the water layer ； Another example is dichloromethane and water: if the product dissolves in water, the density of water increases, making it difficult to separate it from dichloromethane. In such cases, it is necessary to reduce the density of water, which is achieved by adding more water. Also, after mixing, it needs to be left to stand for a while, at least 30 minutes. Emulsification mechanism: Upon the addition of surfactants, due to their amphiphilic nature, these surfactants tend to adsorb and accumulate at the oil-water interface, thereby reducing the interfacial tension and altering the state of the interface. This allows the \"oil\" and \"water\" liquids, which otherwise cannot mix together, to be combined; one of the liquid phases breaks down into numerous particles that are dispersed within the other phase, resulting in an emulsion.