Patent ID: 6706939
Filing Date: 2004-03-16
Classification: C07C

Abstract:
A method for concentrating 2,6-dimethylnaphthalene in a dimethylnaphthalene isomer mixture in which o-xylene contains the 2,6-dimethylnaphthalene and 2,7-dimethylnaphthalene, comprising:the step of supplying the dimethylnaphthalene isomer mixture to an adsorption column packed with Y-type zeolite, wherein the value of (u1/3/&egr;)dâˆ’5/3 is 14 (m5/3 sâˆ’1/3 kgâˆ’1) or more, where u represents linear velocity (m/s) of the dimethylnaphthalene isomer mixture supplied to the adsorption column, &egr; represents packing density (kg/m3) of the Y-type zeolite, and d represents grain size (m) of the Y-type zeolite.