1,5-Dimethylnaphthalene → 1,5-Dimethyltetralin

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The dimethylnaphthalene isomer mixture as a raw material introduced to the distillation column (1) for purification of low boiling point materials are a mixture comprising isomers rich in 1,5-DMN, and high boiling point and low boiling point hydrocarbons, which are produced from dehydrogenation of 1,5-DMT. Further, the mixture further comprises 2,6-DMN, 1,6-DMN, 1,5-DMN and other materials, which are recycled to a distillation column after separation and purification for crystallization, in the amounts as depicted in the following Table 1, respectively.

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