Process for production of dimethyltetralin
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsShinji Ozawa, Makoto Takagawa, Kenji Dnamasa
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Abstract
There is disclosed a process for producing dimethyltetralin consisting of 1,5-, 1,6- and 2,6-dimethyltetralin which comprises cyclizing 5-tolyl-penta-2-ene in gaseous state in the presence of diluent by the use of a catalyst comprising a crystalline aluminosilicate and a carrier and optionally a molding assistant. The abovementioned process is capable of producing industrially useful dimethyltetralin as the starting raw material for dimethylnaphthalene with high yield and high selectivity with minimized side reactions over a long stabilized period.
Claims14
A process for producing a dimethyltetralin product consisting essentially of 1,5-dimethyltetralin, 1,6-dimethyltetralin and 2,6-dimethyltetralin, which comprises cyclizing 5-tolyl-penta-2-ene in a gaseous state in the presence of a diluent with a catalyst comprising (i) a crystalline aluminosilicate selected from the group consisting of mordenite, X-type zeolite and Y-type zeolite and (ii) a carrier, the carrier being at least one member selected from the group consisting of carbon, silicon oxide, titanium oxide and zirconium oxide and the ratio of the crystalline aluminosilicate to the carrier is 0.01 to 0.5 by weight based on the carrier, a mole ratio of the diluent to the 5-tolyl-penta-2-ene as a starting material being larger than a value determined by the following equation:
- (P/exp(0.03 T-0.35))+1, wherein P is a reaction pressure in mmHg-absolute at which the cyclizing is carried out and T is a reaction temperature in .degree. C. at which the cyclizing is carried out.
Dependencies are inferred from the claim text.