Preparation method for preparing paraxylene catalyst by virtue of alkylation of methanol

Abstract

The invention discloses a method for preparing a paraxylene catalyst by virtue of alkylation of methanol. The method adopts Pt(acac)2, Fe(acac)2, Cu-BTC, tetrahydrofuran, borane-tetrahydrofuran complex, Cu(NO3)2.3H2O and BTC as main raw materials, adopts a super-critical metal compound as a precursor under the effect of supercritical carbon dioxide serving as a fluid medium, adoptes a Cu-BTC porous material as a carrier, and adopts boranes as a reducing agent to react, thus obtaining a pours material loaded binary or multi-element nano alloy catalyst. By virtue of the alkylation reaction of the methanol, paraxylene is obtained, so that an isomeration step in the traditional process is omitted, the technological route is shortened, and the single-course yield of the paraxylene is greatly increased.

Description

technical field [0001] The invention relates to a fluidized bed catalyst for producing p-xylene with high selectivity in the alkylation of benzene and methanol and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] P-xylene is an extremely important bulk chemical raw material, mainly used in the production of terephthalic acid and dimethyl terephthalate. Due to the rapid development of my country's polyester industry, the consumption of p-xylene has also increased rapidly. In industry, p-xylene is generally produced by separating aromatics from petroleum cracking products, disproportionating toluene, or transalkylating heavy aromatics. Because these methods produce a large amount of benzene by-product, and the economic value of benzene is low, it affects p-xylene to a certain extent. Economics of the toluene production process. The traditional method mostly adopts fixed bed technology, the bed temperature is not unifo...

AI Technical Summary

Problems solved by technology

In industry, p-xylene is generally produced by separating aromatics from petroleum cracking products, disproportionating toluene, or transalkylating heavy aromatics. Because these methods produce a large amount of benzene by-product, and the economic value of benzene is low, it affects p-xylene to a certain extent. Economics of Toluene Preparation Process

The traditional method mostly adopts fixed bed technology, the bed temperature is not uniform, the catalyst is poor in stability, easy to deactivate and difficult to regenerate. value, so the cost is high; the preparation and modification steps of the catalyst are cumbersome and expensive

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