FIELD: chemistry.
SUBSTANCE: method of purifying maleic anhydride involves heating molten initial crude product to 60-65°C and then cooling to 53-54°C and filtering at temperature of 51.5-53°C. Filtration is carried out on a filter with hole size of 0.01-0.05 mm and the molten mass is thermally processed in an atmosphere of dry inert gas or in sealed conditions in an atmosphere of dry inert gas.
EFFECT: high technological effectiveness of the process owing to its short duration and use of lower temperature parametres and higher degree of purification of maleic anhydride.
1 cl, 1 ex
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