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

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...

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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 molecular sieves synthesized by traditional electric heating and microwave heating methods to prepare 2,6-DMN, which is of great significance

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