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:
Mar. 20, 2001
Filed:
Nov. 04, 1998
Toshio Tsutsui, Chuo-ku, JP;
Takumi Sasaki, Chuo-ku, JP;
Yoshitaka Satou, Sodegaura, JP;
Osamu Kubota, Sodegaura, JP;
Shinichi Okada, Sodegaura, JP;
Masaki Fujii, Chuo-ku, JP;
Fuji Oil Company, Ltd., Tokyo, JP;
Abstract
A rational technical process for producing dialkylnaphthalenes from petroleum-derived starting materials which exist in abundance is established. The process for producing dialkylnaphthalenes contains the steps (1), (2), (3), and (4): (1) 1,step which is for catalytically hydrodealkylating a stock oil containing a substantial amount of naphthalene and/or alkylnapthalenes, separating a product oil form a product gas, and separating and recovering a fraction composed mainly of naphthalene and/or methylnaphthalene from the product oil; (2) 2,step which is for catalytically alkylating or catalytically transalkylating the fraction, recovered in the 1,step, composed mainly of naphthalene and/or methylnaphthalene directly without pretreatment for purification, with an alkylating agent or transalkylating agent to prepare alkylnaphthalenes; (3) 3,step which is for separating and recovering dialkylnaphthalenes from the alkylnaphthalenes obtained in the 2,step; and (4) 4,step which is for returning at least a part of the residual fraction, after the separation and recovery of dialkylnaphthalenes in the 3,step, as at least a part of the stock oil in the 1,step and/or at least part of the alkylating agent or transalkylating agent in the 2,step to the corresponding step.