A kind of production method of 1,4-naphthoquinone, adopted catalyst and its application

Abstract

The invention discloses a production method of 1,4-naphthoquinone, the catalyst used and its application. The method comprises: step 1, mixing liquid naphthalene with hot air, heating and vaporizing to obtain a naphthalene-air mixture; step 2 , the naphthalene-air mixture is input into the first reactor, and the catalytic oxidation reaction is carried out at 350-400°C by the first catalyst, and the gas residence time is 1-1.5 seconds; The aqueous solution of the product; Step 4, performing solid-liquid separation treatment, collecting the solid mixture and the liquid mixture respectively; Step 5, separating the solid mixture through solvent extraction and recrystallization to obtain 1,4-naphthoquinone. The production method of the present invention has low difficulty in controlling the concentration of naphthalene, high safety, low degree of deep oxidation, and high yield. The conversion rate of naphthalene is 95.5~99.7%, and the yields of the main reaction products 1,4-naphthoquinone and phthalic anhydride are 44% respectively. ~58%, total reaction yield ≥ 102%, total product yield ≥ 95%, broad application prospects.

Description

technical field [0001] The invention belongs to the field of fine chemical synthesis, and relates to a production method for preparing 1,4-naphthoquinone by catalytic oxidation in a fixed-bed reactor, a catalyst used and an application thereof. Background technique [0002] As an important new fine chemical product and organic synthesis intermediate, 1,4 naphthoquinone is mainly used in the synthesis of pharmaceuticals, pesticides, spices, dyes and other intermediates; in the fields of national defense, aviation and aerospace, it can be used for carbon fiber ablation-resistant compounding Raw materials for materials; in the field of large-scale integrated circuit semiconductors, the introduction of naphthoquinones has a unique regulator effect on the performance of high-end heat-resistant novolak epoxy resins and carbon-carbon composite materials; in the field of synthesizing pharmaceutical compounds with biological activity, it is very important The role of antibiotics, ant...

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Problems solved by technology

[0006] The purpose of the present invention is to solve defects such as the low conversion rate of naphthalene and the low production yield of 1,4 naphthoquinone in the prior art, and the three wastes are easy to produce, and provide a fixed-bed reactor catalytic oxidation system for vaporizing naphthalene below the boiling point temperature. , the production method of 4-naphthoquinone, on the premise that the naphthalene air ratio is 0.02~0.04, using the principle of variable partial pressure of the mixture gas vapor, the liquid naphthalene below the boiling point temperature is directly mixed with hot air, vaporized and catalyzed to produce 1,4-naphthoquinone The advanced production method (including naphthalene feeding method, first reactor, catalyst, water capture, second reactor waste gas treatment and post-treatment process), is suitable for industrial production, with high yield, low cost and environmental friendliness

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