Process for preparing 2-methylnaphthalene

Details Process for preparing 2-methylnaphthalene Process for preparing 2-methylnaphthalene

1992-08-10

1993-09-07

Pal, Asok

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

With hydrocarbon recycle from later to earlier synthesis

585478, 585481, C07C 527, C07C 706

Patent

active

052431134

ABSTRACT:
An economically advantageous process for preparing 2-methylnaphthalene is provided. The process comprises the steps of azeotropically distilling a 1-methylnaphthalene-containing oil with ethylene glycol to produce a denitrified oil; subjecting the denitrified oil to an isomerization to promote an isomerization from 1-methylnaphthalene to 2-methylnaphthalene and produce an isomerization product; and recovering 2-methylnaphthalene from the isomerization product. The process may further comprise the step of hydrodesulfurizing or hydrogenating a portion or all of the denitrified oil to produce a hydrodesulfurized or hydrogenated product so that the product alone or the product together with the non-hydrodesulfurized or hydrogenated oil can be subjected to the subsequent isomerization step. Catalytic life of the isomerization catalyst is markedly prolonged to enable a production of 2-methylnaphthalene at a high yield.

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Salinas et al. App. Catalysis, vol. 9 (1984) pp. 109-117.

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