Selection of solvents in refined products
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This post was last edited by zxh6267 on 2009-9-4 07:31. How to choose the appropriate solvent when refining products. Welcome to join the discussion. (What is the best solvent for 2-methylimidazole?) ）
This question seems quite general. If the goal is to extract a certain impurity, then a solvent that can dissolve the impurity without dissolving the main product is chosen (strictly speaking, an extractant). In the case of recrystallization, a solvent that can dissolve the product is selected; the solubility of the main product in this solvent varies significantly with temperature, which allows for recrystallization and purification. When some impurities have boiling points or melting points similar to those of the main product, or are even miscible with it, then a special solvent must be used to form new compounds from the impurity and the main product, so that they can be separated through distillation or fractional distillation, followed by the separation of the pure product
Since the materials are different, the solvents used must also be different； Since the properties of materials vary, the properties of the solvents used should also differ; it cannot be generalized!
What is the best solvent for 2-methylimidazole?
Although I have no experience with extraction or extractive distillation, the following principles are essential when selecting a solvent: 1. The solvent should allow for easy separation from the solute. 2. The solvent should have a high selectivity for dissolution.
1. Choose one with a strong ability to dissolve impurities and a weak ability to dissolve the product. 2. Choose one with high solubility at high temperatures, and whose solubility drops significantly as the temperature decreases. Choosing based on these two criteria should be fine.
4# lhb234 2-methylimidazole is soluble in water and alcohol. You can try using ethanol.
The functions of selecting a solvent are mainly as follows: 1. Recrystallization; 2. Removing impurities by heating with a solvent of low boiling point; 3. Dissolving the substances required, and removing unwanted substances through filtration; 4. Dissolving the unwanted substances and filtering out those that are needed
Use the principle of like dissolves like to choose the solvent you need! It’s best to have strong selectivity!
When selecting a solvent for the refining process, its purity must meet the required standards; otherwise, it serves no purpose. Alcohols can be chosen considering their solvency properties, while C3 propanol and C4 butanol are recommended due to their volatility and boiling points – values that are too low or too high are not suitable
You can try using DMSO (dimethyl sulfoxide).