Process for the preparation of 2,6-dimethylnaphthalene

Details Process for the preparation of 2,6-dimethylnaphthalene Process for the preparation of 2,6-dimethylnaphthalene

B - Operations, Transporting

01

J

B01J 29/70 (2006.01) B01J 29/90 (2006.01) B01J 38/56 (2006.01) C07C 2/66 (2006.01) C07C 2/86 (2006.01) C07C 5/27 (2006.01) C07C 6/12 (2006.01) C07C 15/24 (2006.01)

Patent

CA 2323305

A highly selective process is described for preparing 2,6-dimethylnaphthalene which comprises reacting a naphthalene hydrocarbon selected from naphthalene, methylnaphthalenes, dimethylnaphthalenes, trimethylnaphthalenes, polymethyl-naphthalenes, and/or their mixtures with one or more benzene hydrocarbons selected from benzene, toluene, xylenes, trimethylbenzenes, tetramethylbenzenes, pentamethylbenzene and/or hexamethylbenzene, under at least partially liquid phase conditions and in the presence of a catalytic composition comprising a zeolite belonging to the MTW structural type and at least one element selected from P, B and Si. The process is preferably carried out in the presence of a methylating agent.

On décrit un procédé hautement sélectif de synthèse du 2,6-diméthylnaphtalène, lequel consiste à faire réagir un hydrocarbure de naphtalène choisi parmi un naphtalène, des méthylnaphtalènes, des diméthylnaphtalènes, des triméthylnaphthalènes, des polyméthyl-naphtalènes et/ou leurs mélanges avec un ou plusieurs hydrocarbures de benzène choisis parmi le benzène, le toluène, les xylènes, les triméthylbenzènes, les tétraméthylbenzènes, le pentamthylbenzène et/ou l'hexaméthylbenzène, dans des conditions de phase au moins partiellement liquide et en présence d'une composition catalytique comprenant un zéolite appartenant au type structural MTW et au moins un élément choisi parmi P, B et Si. Le procédé est de préférence mis en oeuvre en présence d'un agent de méthylation.

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