Preparation method and application of catalyst for preparing 2-methylnaphthalene/2, 6-dimethylnaphthalene from synthesis gas and naphthalene through one-step method

Abstract

The invention relates to a preparation method and application of a catalyst for preparing 2-methylnaphthalene / 2, 6-dimethylnaphthalene from synthesis gas and naphthalene through one-step method, which comprises the following steps: mixing one of ZnAlCrOx, ZnZrOx, InZrOx, ZnAlOx and ZnGaOx with a molecular sieve in equal mass, and tabletting to obtain the catalyst, being 20 ~ 40 meshes, for preparing 2-methylnaphthalene / 2, 6-dimethylnaphthalene from synthesis gas and naphthalene through one-step method. According to the invention, synthesis gas is converted into active intermediates such as methanol on a metal catalyst, and then the active intermediates and naphthalene are subjected to a methylation reaction at the acid site of a zeolite molecular sieve. Therefore, the invention for producing high-added-value chemicals through the methylation reaction of the synthesis gas and naphthalene has the advantages of short process route, high naphthalene conversion rate, high catalyst stability, high target product selectivity and the like, and is more economical and efficient.

Description

technical field [0001] The invention relates to the technical field of polycyclic aromatic hydrocarbons alkylation conversion into high value-added chemicals, in particular to the preparation of a catalyst for the one-step preparation of 2-methylnaphthalene / 2,6-dimethylnaphthalene from synthesis gas and naphthalene method and application. Background technique [0002] At present, the research on the alkylation of methanol and aromatic hydrocarbons has entered a relatively mature stage from the development of catalysts to the discussion of the reaction mechanism. Research further matures. However, there are still relatively few studies on the alkylation of PAHs. Because polycyclic aromatic hydrocarbons have more reactive sites, catalyst deactivation is more serious than monocyclic aromatic hydrocarbons. In recent years, due to the rapid development of new polymer materials, the demand for polycyclic aromatic hydrocarbons has gradually increased, making the research on poly...

AI Technical Summary

Problems solved by technology

Although the above-mentioned two-step technical route is relatively mature, there are the following problems: first, due to thermodynamic constraints, the equilibrium conversion rate of synthesis gas to methanol is low, and a large amount of raw material gas needs to be recycled, which increases the operating cost; second, methanol itself reacts (such as methanol to olefins) is easier to carry out than the methylation of methanol and naphthalene, so that a large amount of methanol fails to participate in the methylation reaction, resulting in a low single-pass conversion rate of benzene, and methanol is easy to generate a large amount of low Carbon deposition precursors such as carbon olefins make the catalyst easy to deactivate by carbon deposition

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