Method for refining dodecanedioic acid

The invention relates to a method for refining dodecanedioic acid and belongs to the technical field of preparation of chemical products. According to the method, the dodecanedioic acid is refined by using dodecanedioic acid produced by a biological fermentation method or an enzyme method as a raw material and alcohol as a solvent. The method particularly comprises the following steps: mixing the dodecanedioic acid and the alcohol; heating and decoloring, wherein heat is not preserved after heating to a certain temperature in the decoloring process; directly filtering; cooling, crystallizing and centrifuging the filtrate to obtain a centrifugal material; washing the centrifugal material with the alcohol; performing secondary centrifugation; and vacuum drying to obtain the dodecanedioic acid refined product. According to the method, the problem about the product quality of the dodecanedioic acid refined by the alcohol is solved, the single acid content and the total acid content of the dodecanedioic acid produ