Operation conditions for extraction
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The solvent is used to absorb the organic compounds in a mixture that contains organic substances (the product) and water into the solvent. Can this process be referred to as an extraction operation? Also, if so, is there any special relationship between this operation and PH? In our factory, after adjusting the pH to between 4 and 5, the solvent (containing organic substances) is at the top, the emulsified phase is in the middle, and the aqueous phase is at the bottom. If the PH is not below 5, it’s very difficult to achieve stratification! Please explain!
If it is extraction, an emulsified phase is present in between, which makes the process difficult to handle; it is even impossible to carry out on an industrial scale. Could the original poster explain the question more clearly – why is it necessary to adjust the pH value?
You’re referring to the extraction process. As for why to adjust the pH value, it depends on your specific situation – what solvents and products you are using; the acidity of the solution can affect the way these substances interact with water.
Reply to 4# *ngguanglueguo: The solvent is a mixture of methylcyclohexane and toluene in a 50% to 50% mass ratio. As for why the pH is adjusted, it is because at lower pH levels, the three components tend to separate into layers, which facilitates their separation. The product is an ester compound.
It should be said that you have three phases, which makes it inconvenient to operate. It’s just the oil phase (toluene, methylcyclohexane, and esters) and the water phase (water, esters); how can there be a third phase? How is the third phase removed from the system? How to control the two interfaces?
Reply to 1# formosapta: With the solvents, toluene, and esters you mentioned, surfactants are very likely to be formed, which in turn leads to the creation of an emulsified layer. This is a serious problem in production; if not addressed, it can even cause the shutdown of the enterprise