METHOD FOR MANUFACTURING 2,6-DIMETHYLNPTHTHALENE

摘要

A method for producing a high purity 2,6-dimethylnaphthalene by subjecting a dimethylnaphthalene-containing mixture which contains 2,6-dimethylnaphthalen e to crystallization by cooling and then to solid-liquid separation, and washi ng the resultant solid with a solvent, characterized in that the solid-liquid separation step comprises expression filtration. Preferably, a pressure of 1 0 kg/cm2 or higher is employed for the expression filtration. The method can b e used for producing a high purity 2,6-dimethylnaphthalene from a DMN mixture containing 2,7-dimethylnaphthalene in an amount of 5 mass % or more as a starting material, and further for producing a high purity 2,6- dimethylnaphthalene from a DMN mixture having a 2,6-dimethylnaphthalene content of 25 mass % or less as a starting material.