Method for preparing 2,6-dimethyl naphthalene by alkylation reaction of MgAPO-11 molecular sieve catalytic naphthalene

A molecular sieve catalyzed naphthalene and alkylation reaction technology, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of shortening crystallization time, facilitating large-scale production, and appropriate strength

Inactive Publication Date: 2013-08-28
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no report about the use of MgAPO-11 molecular sieves in the preparation of 2,6-DMN. For the first time, we used MgAPO-11 m

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  • Method for preparing 2,6-dimethyl naphthalene by alkylation reaction of MgAPO-11 molecular sieve catalytic naphthalene
  • Method for preparing 2,6-dimethyl naphthalene by alkylation reaction of MgAPO-11 molecular sieve catalytic naphthalene
  • Method for preparing 2,6-dimethyl naphthalene by alkylation reaction of MgAPO-11 molecular sieve catalytic naphthalene

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specific Embodiment approach 1

[0026] Specific embodiment one: the method for preparing 2,6-dimethylnaphthalene by the alkylation reaction of naphthalene catalyzed by MgAPO-11 molecular sieve in this embodiment is realized according to the following steps:

[0027] 1. Put 20-40 mesh MgAPO-11 molecular sieves into the constant temperature zone of the stainless steel reaction tube of the fixed-bed microreactor, activate it for 2 hours at a temperature of 550°C and a nitrogen flow rate of 10ml / min, and then cool down to 350-450 ℃, and the activated MgAPO-11 molecular sieve is placed in the catalyst bed of the fixed-bed microreactor;

[0028] 2. Mix naphthalene, alkylating agent and solvent in a molar ratio of 1: (2-4): (6-12) to make a raw material liquid, then use a metering pump to continuously inject the raw material liquid into the catalyst of the fixed-bed microreactor Alkylation reaction between the bed layer and the activated MgAPO-11 molecular sieve, the reaction temperature is 350-450°C, the pressure ...

specific Embodiment approach 2

[0029] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the magnesium source of MgAPO-11 molecular sieve described in step one is Mg(NO 3 ) 2 ·6H 2 O or Mg(CH 3 COO) 2 4H 2 O. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that MgO and Al in the MgAPO-11 molecular sieve described in step one 2 o 3 The molar ratio is (0.01~0.40):1. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for preparing 2,6-dimethyl naphthalene by alkylation reaction of MgAPO-11 molecular sieve catalytic naphthalene. The method comprises the following steps of: I, activating an MgAPO-11 molecular sieve; and II, mixing naphthalene with an alkylation reagent and a solvent to prepare a feed solution, and carrying out alkylation reaction on the feed solution and the activated MgAPO-11 molecular sieve catalytic naphthalene to obtain the 2,6-dimethyl naphthalene. According to the method for preparing 2,6-dimethyl naphthalene by alkylation reaction of MgAPO-11 molecular sieve catalytic naphthalene, the used MgAPO-11 molecular sieve is synthesized by adopting a conventional electric heating method or a microwave heating method; the alkylation reaction of the MgAPO-11 molecular sieve catalytic naphthalene can be used for overcoming the defects that the homogeneous catalysts including anhydrous AlCl3 and the like are difficult to separate from the product, severe in device corrosion and severe in environment pollution, so that the reaction activity and 2,6-DMN (Dimethylnitrosamine) selectivity are higher, the 2,6-/2,7-DMN ratio and anti-carbon deposition capacity are higher. Moreover, the reaction products and the catalysts are easy to separate. Besides, the method is simple to operate and convenient for large-scale production.

Description

technical field [0001] The present invention relates to a method for preparing 2,6-dimethylnaphthalene (abbreviated as 2,6-DMN), in particular to the preparation of MgAPO-11 molecular sieve catalyzed by the alkylation of naphthalene synthesized by traditional electric heating method and microwave heating method 2,6-Dimethylnaphthalene method. Background technique [0002] Aluminum phosphate series molecular sieves are a new class of molecular sieves developed by Union Carbide Corporation in the early 1980s. They have good adsorption, thermal stability and hydrothermal stability, but because their skeleton structure is electrically neutral, they do not have ionic The surface acidity of the exchange performance is extremely weak, so its application is greatly limited. Substituting different metals Me (such as Si, Fe, Co, Mn, Mg, etc.) for Al in the framework of aluminum phosphate molecular sieves can greatly improve its acidity and catalytic performance without changing the f...

Claims

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Application Information

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IPC IPC(8): C07C15/24C07C2/88B01J29/84
Inventor 吴伟刘敏肖林飞徐宏玺刘洋
Owner HEILONGJIANG UNIV
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