Process for the purification and preparation of acrylic acid or methacrylic acid
   
   

Acrylic acid or methacrylic acid is purified by crystallization to obtain crystals and a mother liquor, by a process in which the crystals are washed with a wash liquid containing the acid and having a temperature from 15 to 40 C. Furthermore, a process for the preparation of acrylic acid or methacrylic acid comprises the abovementioned purification process.

 
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