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| Preparation of 2,6-diisopropylnaphthalene with recycled process of isomers |
| Zheng Hua Tian, Gui Li Zhao, Hong Min Jia, Ben Li, Wei Qi Hu |
| School of Chemical Engineering, University of Science & Technology Liaoning, Anshan 114051, China |
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Abstract 2, 6-Diisopropylnaphthalene (2, 6-DIPN), as the precursor of important monomer 2, 6-naphthalene dicarboxylic acid, was prepared by hydroisopropylation of refined naphthalene with propene over shape-selective catalyst.Naphthalene conversion of 92% and 2, 6-DIPN selectivity of 64% were obtained.Static melt crystallization was applied to separate and purify 2, 6-DIPN from its isomers, resulted in a product purity of ≥99%.The other isomers were converted into monoisopropylnaphthalene, which also reacted with propcne to form 2, 6-DIPN.A recycled process including hydroisopropylation, separation and transalkylation was established, the yield of 2, 6-DIPN based on naphthalene could be doubled by one cycle operation.
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Received: 24 October 2007
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| Fund:This project was supported by the Northeast Rejuvenation Strategy Foundation of Anshan City, China (No. 032042). |
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Corresponding Authors:
Zheng Hua Tian,E-mail address:cghtzh@mail.asptt.ln.cn
E-mail: cghtzh@mail.asptt.ln.cn
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