Method for separating alkylnaphthalene

• US 6,153,808 A
• Filed: 10/02/1998
• Issued: 11/28/2000
• Est. Priority Date: 10/03/1997
• Status: Expired due to Fees

• Current Assignee: Klaus Schmidt
• Original Assignee: Klaus Schmidt
• Inventors: Matsuda, Masaaki, Matsumoto, Yonezo, Kumazawa, Midori, Nakashima, Hisako, Yamamoto, Koji, Yoshida, Shingo, Motoyuki, Masahiro
• Primary Examiner(s): YOON, TAE H
• Application Number:
  US09/165,097
• Time in Patent Office: 788 Days
• Field of Search: 95/88, 95/84, 95/237, 585/821, 585/825
• US Class Current: 585/821
• CPC Class Codes: C07C 15/24 containing two rings
• CPC Class Codes: C07C 7/12 by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers
• CPC Class Codes: C08G 63/189 containing a naphthalene ring

Abstract

In a method for separating at least one alkylnaphthalene from a stock mixture containing at least two alkylnaphthalenes selected from the group consisting of monoalkylnaphthalenes and dialkylnaphthalenes, a column packed with an optically active chromatographic packing is used for separation. The method can effectively separate a variety of alkylnaphthalenes from a mixture thereof.

Claims

1. A method for separating at least 2,6-dimethylnaphthalene from 2,7-dimethylnaphthalene contained in a stock mixture containing at least two alkylnaphthalenes comprising passing said stock mixture through a column packed with an optically active chromatographic packing material.

2. The method according to claim 1, wherein said optically active chromatographic packing support comprises at least one derivative selected from the group consisting of cellulose tris(4-methylbenzoate), cellulose tris(4-ethylbenzoate), cellulose tris(5-methylbenzoate), cellulose tris(3,5-dimethylphenylcarbamate), cellulose tris(3,5-diethylphenylcarbamate), ruthenium trisphenanthroline and mixtures thereof.

3. The method according to claim 2, wherein said support is an inorganic support having a particle size of 5 to 300 μ

m and pores of a diameter in a range of 20 to 1,000 angstroms.

4. The method according to claim 3, wherein said inorganic support is selected from the group consisting of silica gel, alumina, zeolite, and bentonite.

5. The method according to claim 1, wherein said stock mixture contains a mixture of monoalkylnaphthalene isomers and dialkylnaphthalene isomers.

6. The method according to claim 1, wherein said stock mixture comprises 2,6-dimethylnaphthalene, 2,7-dimethylnaphthalene and one or more alkylnaphthalene selected from the group consisting of 2,3-dimethylnaphthalene, 1,2-dimethylnaphthalene, 1,3-dimethylnaphthalene, 1,4-dimethylnaphthalene, 1,5-dimethylnaphthalene, 1,6-dimethylnaphthalene, 1,7-dimethylnaphthalene, 1,8-dimethylnaphthalene, 1-methylnaphthalene, and 2-methylnaphthalene.