Preparation of 2-Methylnaphthalene from 1-Methylnaphthalene via Catalytic Isomerization and Crystallization

*Hao Sun -  Jiangsu Key Laboratory for Biomass Energy and Material, National Engineering Laboratory for Biomass Chemical Utilization, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry , Nanjing 210042, China
Kang Sun -  Jiangsu Key Laboratory for Biomass Energy and Material, National Engineering Laboratory for Biomass Chemical Utilization, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry , Nanjing 210042, China
Jianchun Jiang -  Jiangsu Key Laboratory for Biomass Energy and Material, National Engineering Laboratory for Biomass Chemical Utilization, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry , Nanjing 210042, China
Zhenggui Gu -  Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, College of Chemistry and Materials Science, Nanjing Normal University , Nanjing 210023, China
Received: 10 May 2018; Published: 4 Dec 2018.
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Large amounts of residual 1-methylnaphthalene are generated when 2-methylnaphthalene is extracted from alkyl naphthalene. In order to transform waste into assets, this study proposes a feasible process for preparing 2-methylnaphthalene from 1-methylnaphthalene through isomerization and crystallization. The 1-methylnaphthalene isomerization was carried out in a fixed-bed reactor over mixed acids-treated HBEA zeolite. The results showed that acidic properties of catalysts and reaction temperature were associated with the 2-methylnaphthalene selectivity, yield and catalytic stability. At a high reaction temperature of 623 K, the 2-methylnaphthalene yield was 65.84 %, and the deactivation rate was much lower. The separation of reaction products was then investigated by two consecutive crystallization processes. Under optimal conditions, the 2-methylnaphthalene purity attained 96.67 % in the product, while the yield was 87.48 % in the refining process. Copyright © 2018 BCREC Group. All rights reserved

Received: 10th May 2018; Revised: 16th July 2018; Accepted: 17th July 2018

How to Cite: Sun, H., Sun, K., Jiang, J., Gu, Z. (2018). Preparation of 2-Methylnaphthalene from 1-Methylnaphthalene via Catalytic Isomerization and Crystallization. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (3): 512-519 (doi:10.9767/bcrec.13.3.2650.512-519)

Permalink/DOI: https://doi.org/10.9767/bcrec.13.3.2650.512-519

 

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Keywords
Modified zeolite; 1-Methylnaphthalene, Isomerization; Crystallization; 2-Methylnaphthalene
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