	US 7,576,253 B2
	Method of separating dimethylnaphthalene isomers
Shinichi Nagao, Okayama (Japan); and Hiroshi Ogawa, Okayama (Japan)
Assigned to Mitsubishi Gas Chemical Company, Inc., Tokyo (Japan)
Appl. No. 11/722,605 PCT Filed Dec. 21, 2005, PCT No. PCT/JP2005/023482 § 371(c)(1), (2), (4) Date Jun. 22, 2007, PCT Pub. No. WO2006/068174, PCT Pub. Date Jun. 29, 2006.
Claims priority of application No. 2004-373979 (JP), filed on Dec. 24, 2004.
Prior Publication US 2008/0125615 A1, May 29, 2008
Int. Cl. C07C 7/12 (2006.01)

U.S. Cl. 585—828 [585/820; 585/822]

15 Claims

1. A method of separating a dimethylnaphthalene isomer, comprising:

passing a feedstock oil comprising a dimethylnaphthalene isomer mixture including an α,α-isomer, an α,β-isomer, and a β,β-isomer through an adsorbent layer A including mordenite zeolite together with a developing solvent;

passing a liquid which has been passed through the adsorbent layer A though an adsorbent layer B including zeolite Y;

passing an eluent through the adsorbent layer B to obtain an eluate; and

separating the α,β-isomer from the eluate.