Method for isomerizing dimethylnaphthalene
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsMakoto Takagawa, Ryusuke Shigematsu, Kazuo Nagagata
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Abstract
There is disclosed a method for isomerizing dimethylnaphthalene (DMN) in liquid phase under atmospheric pressure by using a catalyst comprising hydrogen-form mordenite which has a molar ratio of silica to alumina (SiO.sub.2 /Al.sub.2 O.sub.3 ratio) of at least 100 and is molded by incorporating alumina as the molding aid therein. According to the above method, the objective 2,6-DMN minimized in the contents of impurities can stably be produced in high selectivity and high yield under mild reaction conditions for a long period of time, while side reactions and deterioration of the catalyst are suppressed to a minimum.
Claims14
A method of isomerizing dimethylnaphthalene which comprises isomerizing dimethylnaphthalene at a temperature of no more than 270.degree. C. in a liquid phase in the presence of a molded catalyst composition which consists essentially of (i) mordenite which is substantially in a hydrogen form, said mordenite having a molar ratio of silica to alumina of at least 150, said mordenite having a total content of alkali metals and alkaline earth metals of no more than 1% by weight, expressed in terms of each of the alkali metals and alkaline earth metals, and (ii) alumina as a molding aid.
Dependencies are inferred from the claim text.