The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 1990
Filed:
Aug. 02, 1989
Yoshimi Shiroto, Yokohama, JP;
Mitsunori Shimura, Yokohama, JP;
Kenji Shimokawa, Yokohama, JP;
Yoshio Fukui, Tokyo, JP;
Sachio Asaoka, Yokohama, JP;
Hiroto Tajima, Kamakura, JP;
Kazuaki Ueda, Kawasaki, JP;
Yakudo Tachibana, Kasukabe, JP;
Kazuhiko Tate, Yokohama, JP;
Hiroaki Taniguchi, Kuki, JP;
Chiyoda Corporation, both of, JP;
NKK Corporation, both of, JP;
Abstract
A process for the production of 2,6-diisopropylnaphthalene is disclosed wherein an isopropylation reaction mixture containing isopropylated naphthalenes is subjected to transalkylation with a triisopropylnaphthalene-containing mixture to obtain a mixture containing mono-, di- and tri-isopropylnaphthalenes which is then separated into a first fraction containing monisopropylnaphthalenes, a second fraction containing diisopropylnaphthalenes and a third fraction containing triisopropylnaphthalenes. The first and third fractions are recycled to the above system, while the second fraction is subjected to separation treatments for the recovery of 2,6-diisopropylnaphthalene. The second fraction from which 2,6-diisopropylnaphthalene has been removed is subjected to transalkylation with naphthalene to obtain a monoisopropylnaphthalene-rich mixture which is to be fed to the isopropylation step.