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Selective Synthesis of 2,6-dimethylnaphthalene by Transalkylation in the Presence of Acid Ionic Liquids [C_nmim]Cl-AlCl_3

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Chemical Research in Chinese Universities 2011年第6期27卷 1010-1013页

作者： WU Guang WU Wei XIAO Lin-fei LIU Dan Heilongjiang Province College Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion School of Chemistry and Material Sciences Heilongjiang University Harbin 150080 P. R. China

A highly selective synthesis of 2,6-dimethylnaphthanlene（2,6-DMN） by transalkylation between 2-methylnaphthanlene（2-MN） and 1,2,4,5-tetramethylbenzene（TeMB） was performed with 1-alkyl-3-methylimidazo- lium aluminum chloride（[Cnmim]Cl-AlCl3） ionic liquids（ILs） as catalysts. The influences of the alkyl group as the organic cation, the acidic strength of [C4mim]Cl-AlCl3 ILs as well as the reaction conditions on the catalytic performance were investigated. [C4mim]Cl-AlCl3 ILs[x（AlCl3）=71%] exhibited high activity and selectivity toward 2,6-DMN. The selectivity to 2,6-DMN and the 2,6-DMN/2,7-DMN ratio reached up to 68.2% and 3.7：1, respectively. The UV-Vis spectrum of TeMB treated by different ILs shows that the protonated degree of TeMB dependeds on the acidity strength of ILs, which has a significant impact on the reaction results. The high protonated degree of TeMB is advantageous to enhancing the conversion of transalkylation and the large stereo-hindrance effect of TeMB is favorable to improving the selecivity to 2,6-DMN.

关键词： Ionic liquid 2 6-dimethylnaphthalene 1-Alkyl-3-methylimidazolium aluminum chloride Transalkylation

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Improved Stability and Shape Selectivity of 2,6-dimethylnaphthalene by Methylation of Naphthalene with Methanol on Modified Zeolites

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Modern Research in Catalysis 2014年第2期3卷 19-25页

作者： Ye Zhang Junpeng Feng Zhanjun Lyu Xuekuan Li Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan China

2,6-dimethylnaphthalene (2,6-DMN) is a key intermediate for polyethylene naphthalate synthesis. The selective synthesis of 2,6-DMN from naphthalene and methanol was carried out over different zeolites (HZSM-5, Hβ, HUSY and SAPO-11) modified by 0.1wt% PdO under atmospheric pressure. Among the adopted zeolites, SAPO-11 exhibits exceptional shape-selectivity and stability to synthesize 2,6-dimethylnaphthalene from methylation of naphthalene, due to the special pore structure of SAPO-11 which inosculated better with 2,6-dimethylnaphthalene than with 2,7-dimethylnaphthalene.

关键词： Naphthalene Methylation 2 6-dimethylnaphthalene Shape-Selective Stability PdO Modified Zeolites

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Methylation of 2-Methylnaphthalene with Methanol over NH_4 F and Pt Modified HZSM-5 Catalysts

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Chinese Journal of Chemical Engineering 2010年第5期18卷 742-749页

作者：赵亮郭新闻刘民王祥生宋春山 State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116012 China EMS Energy Institute and Department of Energy & Mineral Engineering Pennsylvania State University Park PA 16802 USA

Shape-selective methylation of 2-methylnaphthalene (2-MN) was carried out over NH 4 F and Pt modified HZSM-5 (SiO 2 /Al 2 O 3 = 83) catalysts in a fixed-bed down-flow reactor using methanol as methylating agent and 1,3,5-trimethylbenzene (1,3,5-TMB) as a solvent. Pt promoted HZSM-5 catalysts showed low concentration of coke-like polycondensed aromatics, NH 4 F modification decreased non-shape-selective acid sites. After Pt and NH 4 F co-modification, both conversion of 2-MN and selectivity to 2,6-DMN were improved. 6%NH 4 F/0.5%Pt/HZSM-5 catalyst exhibited 13.8% of 2-MN conversion with 6.2% of 2,6-DMN yield after 7 h time on stream (TOS), and 2,6-/2,7-DMN ratio of 1.7 after 10 h of TOS.

关键词： 2-methylnaphthalene methylation HZSM-5 2 6-dimethylnaphthalene NH 4 F/Pt/HZSM-5

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