Carboxylic acid purification

Try at a high temperature of the water, slowly add acidic precipitating carboxylic acid products.Pay attention to the preparation of the initial stage at different temperatures.
(EDTA sodium saline solution needs to be precipitated at a higher temperature acidified, you can refer to it.)

You can try adding alkaline salt solution to the crystal in the acid. If it is very thin, as long as it is a solid, you can try to filter or plate filter

Try the carboxylic acid to use ammonia water into salt and then free the crystal. You can try

Add a large amount of water backflow or proper temperature dissolving, which is really insoluble. It is dissolved with alcohol -solution, such as 20, 30 times, and the prerequisite is not ester.

If it is not good, you can use a centrifugal machine