Fuji Oil Company Limited

Yoshitaka Satou

Toshio Tsutsui

Osamu Kubota

Shinichi Okada

Masaki Fujii

Takumi Sasaki

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.

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Sodegaura, Japan

Yoshitaka Satou