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    • 70. 发明专利
    • JPH05255139A
    • 1993-10-05
    • JP8593492
    • 1992-03-09
    • C07B61/00B01J29/70C07C5/27C07C15/24B01J29/28
    • PURPOSE:To enable isomerization between serial compounds using fine particles of pentasil crystalline aluminosilicate as a catalyst, and obtain 2,6-, 2,7- dimethylnaphthalene(DMN) in high yield. CONSTITUTION:Pentasil crystalline aluminosilicate catalyst comprising more than 50vol.%, preferably 80vol.% of particles smaller than 5mum secondary particle size is used as a catalyst to effect isomerization of DMN at 250 to 600 deg.C, preferably 300 to 500 deg.C under the normal pressure to 100kg/cm , preferably 1 to 20kg/cm . DMN has 10 kinds of isomers, which are classified into 4-series: (A): 2,6-, 1,6-, and 1,5-isomers, (B) 2,7-, 1,7-, and 1,8-isomers, (C) 2,3-, 1,3-, and 1,4-isomers, and (D) 1,2-isomer and it has been said that the isomerization between different series is difficult. The catalyst has enabled the isomerization between the different series.