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Method for catalyzed synthesis of 2,6-dimethylnaphthalene by using ion liquid

A technology of ionic liquid and catalytic preparation, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the difficulties and side effects of 2,6-dimethylnaphthalene Many products, complicated process, etc., to achieve the effect of short reaction time, easy separation and simple operation

Inactive Publication Date: 2012-06-13
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the complex process, many by-products and poor selectivity of 2,6-dimethylnaphthalene in the existing method for preparing 2,6-dimethylnaphthalene, and to separate 2,6-dimethylnaphthalene from the product Based on the difficult problem of naphthalene, a method for the highly selective preparation of 2,6-dimethylnaphthalene catalyzed by ionic liquids is provided

Method used

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specific Embodiment approach 1

[0013] Specific embodiment one: in this embodiment, the method of 2,6-dimethylnaphthalene is as follows: methylnaphthalene, transfer alkylating agent and solvent are mixed, then add 10% of the total weight of the mixed solution to the mixed solution ~75% ionic liquid catalyst, under the protection of inert gas, react for 0.5 hours to 8 hours at a temperature of 10 ° C to 50 ° C, then cool to room temperature, and then decant the upper layer of the reaction liquid in the layered reaction liquid 2,6-dimethylnaphthalene is obtained by separation; wherein the molar ratio of the methylnaphthalene to the transalkylation agent is 1:0.5-3, and the molar ratio of the methylnaphthalene to the solvent is 1:5-30; The transalkylating agent is 1,2,4,5-tetramethylbenzene; the solvent is cyclohexane, n-hexane or decahydronaphthalene.

[0014] In this embodiment, the reaction solution is naturally separated under cooling conditions, and the ionic liquid catalyst is in the lower layer.

specific Embodiment approach 2

[0015] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the methylnaphthalene is 2-methylnaphthalene. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the described methylnaphthalene is a mixed methylnaphthalene, wherein the mixed methylnaphthalene is composed of β-methylnaphthalene and α-methylnaphthalene according to 2~4 : 1 molar ratio of the composition of the mixture. Others are the same as in the second embodiment.

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Abstract

The invention discloses a method for preparing 2, 6-dimethylnaphthalene by ionic liquid catalysis, relating to a method for preparing dimethylnaphthalene by ionic liquid catalysis. The invention solves the problems in the existing method for preparing 2, 6-dimethylnaphthalene that: the process is complex, byproducts are numerous, the selectivity of the 2, 6-dimethylnaphthalene is poor and separating the 2, 6-dimethylnaphthalene from products is difficult. The method comprises the following steps: methylnaphthalene, an alkyl transfer agent and a solvent are mixed; then, the ionic liquid catalyst occupying 10 to 75 percent of the total weight of the mixed solution is added in the mixed solution; reaction is carried out under the protection of inert gas at the temperature of 10 to 50 DEG C for 0.5 to 8h; after that, the mixed solution is cooled to room temperature; and the 2, 6-dimethylnaphthalene is obtained through separation after the decantation of an upper layer of the reaction solution in layered reaction solution. The selectivity of the 2, 6-dimethylnaphthalene obtained by adopting the method is 66.4 to 100 percent; no multi-methylnaphthalene byproducts such as trimethyl-naphthalene and the like are generated; and the method for preparing 2, 6-dimethylnaphthalene has simple process and low production cost.

Description

technical field [0001] The invention relates to a method for preparing dimethylnaphthalene by catalyzing an ionic liquid. Background technique [0002] The 2,6-naphthalene dicarboxylic acid obtained by oxidation of 2,6-dimethylnaphthalene (2,6-DMN) is the key raw material for the production of new polyester polymer material polyethylene naphthalate (PEN). PEN has excellent comprehensive properties. It not only has the characteristics of polyethylene terephthalate (PET), but also has almost all properties better than PET. Widely used in manufacturing industry, building components, fibers, insulating materials, films, disks, beverage bottles, films for food packaging, aerospace and atomic energy materials, etc. It is one of the fastest developed and applied polymer materials in the past 10 years. [0003] BP Amoco Company of the United States is the earliest enterprise in the world to realize the large-scale production of 2,6-DMN. It uses xylene as raw material to synthesize ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/14C07C2/00B01J31/02
Inventor 吴伟肖林飞徐敏王瑜武光
Owner HEILONGJIANG UNIV
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