I am synthesizing choline geranate, an ionic liquid.
Before synthesis, I need to recrystallize geranic acid (85%), but I am having difficulty understanding the recrystallization method.
According to the research paper, recrystallization should be performed at -80°C.
To achieve this, I set up a water bath with acetone and dry ice to maintain -80°C and prepared a saturated solution of geranic acid in acetone at a 7:3 ratio. This allowed me to observe a solid precipitate forming through recrystallization.
However, I am unsure how to remove the acetone and isomers in this process. When I tried using filter paper for filtration, the geranic acid quickly dissolved.
Since this is my first time conducting this experiment, I would appreciate any advice on how to proceed with this step.
First you can generate data of Metastable Zone Width (MSZW) of crystallization and estimate the cooling rate.
Hi Minseok Oh
This is a slightly strange issue. If you absolutely have to do the recrystallization at -80 degC, then your solid product will likely redissolve if you try to filter at room temperature. So you need to do the filtration as close to -80 degC as possible, which if you don't have the proper special equipment may be very difficult.
However, I see that geranic acid has a melting point of 185 degC. With such a high melting point, there should be other solvent systems (systems preferably, not single solvents) that should make the recrystallization possible at a more "humane" temperature. I would recommend that you do a literature search of methods of synthesis and purification of geranic acid, which is not a rare compound. I think you'll find more "friendly" methods.
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