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Method for using CuSAPO-11 molecular sieve for preparation of 2,6-dimethylnaphthalene

A technology for the catalytic preparation of dimethylnaphthalene, which is applied in the direction of molecular sieve catalysts, including molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of poor stability and high activity of 2,6-DMN selective catalysts, and achieve Ease of large-scale production, high reactivity, and high specific surface area

Inactive Publication Date: 2016-05-11
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the technical problem that the existing molecular sieve catalyst used in the preparation method of 2,6-dimethylnaphthalene is difficult to have both high activity and high selectivity of 2,6-DMN and poor stability of the catalyst , providing a method for the catalytic preparation of 2,6-dimethylnaphthalene using CuSAPO-11 molecular sieves

Method used

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  • Method for using CuSAPO-11 molecular sieve for preparation of 2,6-dimethylnaphthalene

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Embodiment 1

[0035] A kind of method utilizing CuSAPO-11 molecular sieve to catalyze the preparation of 2,6-dimethylnaphthalene in the present embodiment comprises the following steps:

[0036] 1) Preparation of CuSAPO-11 molecular sieve:

[0037] a. At 30°C, add aluminum isopropoxide and silica sol to 50% phosphoric acid aqueous solution, stir for 3 hours, then add di-n-propylamine and copper nitrate to the phosphoric acid aqueous solution, and stir for another 2 hours to obtain the reaction Mixture, the mol ratio of described aluminum isopropoxide, silica sol, phosphoric acid, di-n-propylamine and copper nitrate consumption is 0.5:0.05:0.6:0.1:0.05;

[0038] b. Sealing and crystallizing the reaction mixture prepared in step a in a polytetrafluoroethylene-lined stainless steel reactor, the crystallization temperature is 170°C, and the crystallization time is 24h;

[0039] c. Cooling the crystallized reactant in step b to room temperature, and repeatedly washing and separating with deioni...

Embodiment 2

[0048] A kind of method utilizing CuSAPO-11 molecular sieve to catalyze the preparation of 2,6-dimethylnaphthalene in the present embodiment comprises the following steps:

[0049] 1) Preparation of CuSAPO-11 molecular sieve:

[0050] a. At a temperature of 100°C, add aluminum isopropoxide and silica sol to an aqueous phosphoric acid solution with a concentration of 85%, stir for 3 hours, then add di-n-propylamine and copper nitrate to the aqueous phosphoric acid solution, and stir for another 2 hours to obtain a reaction Mixture, the mol ratio of described aluminum isopropoxide, silica sol, phosphoric acid, di-n-propylamine and copper nitrate consumption is 2:0.6:2.0:1.0:0.1;

[0051] b. Sealing and crystallizing the reaction mixture prepared in step a in a polytetrafluoroethylene-lined stainless steel reactor, the crystallization temperature is 200°C, and the crystallization time is 48h;

[0052] c. Cooling the crystallized reactant in step b to room temperature, and repeat...

Embodiment 3

[0061] A kind of method utilizing CuSAPO-11 molecular sieve to catalyze the preparation of 2,6-dimethylnaphthalene in the present embodiment comprises the following steps:

[0062] 1) Preparation of CuSAPO-11 molecular sieve:

[0063] a. At a temperature of 60°C, add aluminum isopropoxide and silica sol to a phosphoric acid aqueous solution with a concentration of 75%, stir for 3 hours, then add di-n-propylamine and copper nitrate to the phosphoric acid aqueous solution, and stir for another 2 hours to obtain a reaction Mixture, the mol ratio of described aluminum isopropoxide, silica sol, phosphoric acid, di-n-propylamine and copper nitrate consumption is 1.5:0.3:1:0.5:0.08;

[0064] b. Sealing and crystallizing the reaction mixture prepared in step a in a polytetrafluoroethylene-lined stainless steel reactor, the crystallization temperature is 180°C, and the crystallization time is 35h;

[0065] c. Cooling the crystallized reactant in step b to room temperature, and repeate...

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Abstract

The present invention belongs to the technical field of preparation of 2,6-dimethylnaphthalene, and particularly relates to a method for using CuSAPO-11 molecular sieve for preparation of 2,6-dimethylnaphthalene. The method solves the technical problems that high activity and high 2,6-DMN selectivity of a molecular sieve catalyst used in 2,6-dimethylnaphthalene preparation methods in the prior art are difficult to achieved at the same time and stability of the catalyst is poor. The catalyst used in the method is the silicon phosphate copper and aluminum molecular sieve CuSAPO-11, a copper salt is added into a process for synthesis of silicon phosphate aluminum molecular sieve SAPO-11 by use a hydrothermal synthetic method for further synthesis of the new type silicon phosphate copper and aluminum molecular sieve CuSAPO-11. The molecular sieve catalyst has suitable acid property, high specific surface area and large mesoporous pore size, so that the molecular sieve catalyst shows higher catalytic activity in the alkylation reaction of naphthalene, the molecular sieve catalyst has high 2,6-dimethylnaphthalene selectivity, and the ratio of 2,6-dimethylnaphthalene to 2,7-dimethylnaphthalene is high.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of 2,6-dimethylnaphthalene, and in particular relates to a method for catalytically preparing 2,6-dimethylnaphthalene by using CuSAPO-11 molecular sieves. Background technique [0002] Polyethylene naphthalate (PEN) is one of the fastest-growing polymer materials in recent years. Due to its superior physical and mechanical properties, heat resistance, gas barrier properties, optics and chemical stability, it is used in food Industries such as packaging films, aerospace and atomic energy materials have a wide range of applications. 2,6-Dimethylnaphthalene (2,6-DMN) is an important monomer raw material for the preparation of PEN, but the large-scale production and application of PEN are seriously restricted due to its long industrialization route and high cost. Therefore, the research and development of a new 2,6-DMN production process and the reduction of the production cost of 2,6-DMN...

Claims

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Application Information

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IPC IPC(8): C07C15/24C07C2/86B01J29/85
CPCB01J29/85C07C2/864C07C2529/85C07C15/24
Inventor 王潇潇刘振民李鹏卫贤贤郭少青
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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