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

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

1Jiangsu 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

2Jiangsu 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; Revised: 16 Jul 2018; Accepted: 17 Jul 2018; Available online: 14 Nov 2018; Published: 4 Dec 2018.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2018 by Authors, Published by BCREC Group under http://creativecommons.org/licenses/by-sa/4.0.

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Abstract

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. 

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Keywords: Modified zeolite; 1-Methylnaphthalene, Isomerization; Crystallization; 2-Methylnaphthalene
Funding: National Natural Science Foundation of China (31770629) and National Nonprofit Institute Research Grant of CAFINT (CAFYBB2017SY031)

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Section: Original Research Articles
Language : EN
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