NaOH-Al2O3/GO catalyst and anisole catalytic synthesis thereof

Abstract

The invention discloses a NaOH-Al2O3 / GO catalyst and anisole catalytic synthesis thereof. Graphene oxide (GO) prepared by a modified Hummrs method serves as a carrier, hydrothermal method is used forloading Al2O3 nanoparticles, and then NaOH is loaded at a high temperature to prepare the NaOH-Al2O3 / GO catalyst. The GO in the catalyst can effectively prevent the agglomeration of the Al2O3 nanoparticles, the nanoparticles can in turn reduce the interlayer force of the GO, the GO has a large specific surface area, so that the loaded catalytic active components are greatly increased, and catalytic activity is further improved; and meanwhile the NaOH loaded in the catalyst provides alkalinity for the catalyst (dimethyl carbonate accelerates the reaction with phenol under alkaline conditions).Therefore, the catalyst is used for catalyzing the reaction between the dimethyl carbonate and the phenol, the yield of the anisole is greatly increased, the environmental protection pressure is reduced, the cost of raw materials can also be lowered, and the environmental protection and economic requirements of industrial anisole production are met.

Description

technical field [0001] The invention belongs to the technical field of preparation of anisole, in particular to a kind of NaOH-Al 2 o 3 / GO catalyst and its catalytic method for synthesizing anisole. Background technique [0002] Anisole has an anise-like aromatic odor and is widely used in organic synthesis reactions. Anisole is prepared from phenol and a methylating reagent under alkaline conditions. Traditionally, anisole is prepared by reacting methylating reagents such as dimethyl sulfate, methanol, and methyl iodide with phenol. Wherein, although the production process with dimethyl sulfate as raw material has good reactivity, a large amount of acid will be produced in the reaction process, which will not only pollute the environment, but also increase the processing cost, and dimethyl sulfate itself is a highly toxic substance . Using methyl iodide as a raw material has high reactivity, but methyl iodide itself is expensive, so it is not the first choice in terms ...

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Problems solved by technology

[0003] Dimethyl carbonate (DMC) is also a kind of common methylation reagent, because it also contains active groups such as methyl group and carbonyl group, and the preparation cost is relatively low, its own toxicity is low, and safety is higher, so it can be used as an ideal Alternatives, but the problem is that compared with dimethyl sulfate or methyl iodide, although it has advantages in terms of economy and environmental protection, its reactivity is lower and the yield of anisole is lower

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