MALEIC ANHYDRIDE PURIFICATION METHOD

摘要

FIELD: chemistry. ^ SUBSTANCE: method of purifying maleic anhydride involves heating molten initial crude product to 60-65C and then cooling to 53-54C and filtering at temperature of 51.5-53C. 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