Heptane → 2,6-Dimethylnaphthalene

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of DMN isomers containing 2% by weight of 2,7-DMN, etc. as shown in Table 3 as the starting raw material was isomerized under liquid-phase flow system and atmospheric pressure at a reaction temperature of 220° C. at a WHSV of 1.0 hr-1 in the presence of a catalyst (alumina content of 20% by weight) prepared by molding with alumina, mordenite type H (silica/alumina molar ratio of 203, produced by Tosoh Corporation). The resultant isoiverization reaction product shown in Table 3 as reaction product (1) was incorporated with the same amount of n-heptane, heated to 80° C. to dissolve the reaction product and then cooled to 20° C. to precipitate crystal. The slurry containing the crystal was filtered by suction with a G2 glass filter, and the crystal thus obtained was rinsed with n-heptane cooled to 20° C. in an amount by weight half the reaction product. As a result, there was obtained 2,6-DMN crystal having the chemical composition given in Table 3 as "Crystal (1)" in a recovery rate of 64.2%. Here, the recovery rate is the percentage of the amount of 2,6-DMN in the resultant crystal based on the amount thereof in the starting raw material for crystallization.

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