How to solve the swelling phenomenon in the product precipitation process
The situation encountered is as follows:
Have you ever encountered the phenomenon of swelling in the product precipitation process, and the swelling is particularly powerful, I tried to recrystallize and refine with a single solvent and a mixed solvent, but the precipitation process is still swelling, just like the colloid, looking at The same as a sponge. Filtration is also difficult to filter, the product itself is very pure, the liquid phase content is greater than 98%, and there is experience to give advice.
User answers:
One: According to the truth, the crystallization process is not going to happen. It seems that it is related to the purity of the solvent, and it is caused by some impurities in the solvent. I only offer one possibility, and it is something that others often don't think. The reagents used are analytically pure and should not be caused by solvent purity.
Two: In this case, there should be a problem with the crystal form of the precipitate that causes a lot of solvent to be wrapped. If it cannot be solved by adjusting the stirring and cooling rate, it is recommended to replace the solvent to make other crystal forms to improve the shape.
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