How to isolate / crystallize citric acid form water ?

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James Demers

Solubility in water is extremely high - saturated solutions contain more citric acid than water - so crystallization will lead to substantial losses.

The usual procedure is to precipitate the calcium salt, then convert back to the free acid. See attached patent.

Carlos Araújo Queiroz

You may want to check also the following related discussion: https://www.researchgate.net/post/How_can_I_extract_calcium_citrate_from_an_aqeueous_solution_containing_magnesium_citrate_and_calcium_citrate