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Purification of 2,6-diisopropylnaphthalene by Static Melt Crystallization from a Mixture Containing diisopropylnaphthalene Isomers

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Chinese Journal of Chemistry 2007年第1期25卷 108-112页

作者：田正华贾宏敏赵桂利胡伟琪 School of Chemical Engineering Liaoning University of Science &Technology Anshan Liaoning 114044 China

2,6-diisopropylnaphthalene （2,6-DIPN）, as the precursor of important monomer 2,6-naphthalene dicarboxylic acid, could be produced by the shape-selective isopropylation of naphthalene with propene resulting in an isomeric mixture having different alkylation levels. Since the boiling points of DIPNs were very close and the differences of melting points in-between isomers were quite distinctive, the static melt crystallization was applied to separate and purify 2,6-DIPN from its isomers. 2,6-DIPN with purity ≥99% was produced through a process of three stages： crystallization→sweating→melting. The phase diagram of 2,6-DIPN-2,7-DIPN binary system was plotted to opti- mize the temperature control of crystallization. By repeated crystallization of melts with different concentration levels, the yield of pure 2,6-DIPN could be enhanced to 87%. No solvent was necessary. Keywords 2,6-diisopropylnaphthalene, static melt crystallization, crystallization rate, sweating rate, eutectic temperature

关键词： 2,6-diisopropylnaphthalene static melt crystallization crystallization rate sweating rate eutectic temperature

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Preparation of 2,6-diisopropylnaphthalene with recycled process of isomers

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Chinese Chemical Letters 2008年第4期19卷 390-394页

作者： Zheng Hua Tian Gui Li Zhao Hong Min Jia Ben Li Wei Qi Hu School of Chemical Engineering University of Science ＆ Technology Liaoning.Anshan 114051China

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 *** conversion of 92% and 2,6-DIPN selectivity of 64% were *** 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 propene 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.

关键词： 2,6-diisopropylnaphthalene Hydroisopropylation Static melt crystallization Intermolecular transalkylation Recycled process

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