Catalyst and preparation method thereof and regeneration method of anthraquinone degradation product

Abstract

The invention relates to the field of the regeneration of anthraquinone degradation products, and discloses a catalyst and a preparation method thereof and a regeneration method of a anthraquinone degradation product. The preparation method of the catalyst comprises the following steps that S1, activated alumina, an alkaline earth metal compound and an optional squeezing aid are mixed to obtain afirst dry material; S2, an acid solution and a silicon source are mixed to obtain a first liquid; S3, the first dry material and the first liquid are mixed and subjected to kneading, extruding and shaping, drying and roasting. The preparation method of the catalyst is simple and low in cost, can effectively improve the regeneration efficiency of the anthraquinone degradation product in a hydrogenperoxide working fluid containing 2-methyl cyclohexyl acetate, obviously reduces the accumulation of the anthraquinone degradation product in the working fluid, and increases the content of effectiveanthraquinone in the working fluid, thereby being conductive to improving the production efficiency.

Description

technical field [0001] The invention relates to the field of regeneration of anthraquinone degradation products, in particular to a catalyst, a preparation method thereof and a regeneration method of anthraquinone degradation products. Background technique [0002] As a recognized bulk green chemical, hydrogen peroxide is widely used in papermaking, printing and dyeing, chemical and other fields. In recent years, with the gradual commissioning of cyclohexanone ammoximation to caprolactam and propylene epoxidation to propylene oxide in China, the amount of hydrogen peroxide has shown a steady growth trend. At present, the method for large-scale production of hydrogen peroxide in industry is mainly the anthraquinone method. [0003] In the process of preparing hydrogen peroxide by anthraquinone method, heavy aromatic hydrocarbons are usually used as solvents for dissolving anthraquinone, and polar solvents such as trioctyl phosphate and o-methylcyclohexyl acetate are used as ...

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Problems solved by technology

However, the mechanical strength of the catalyst is relatively poor; on the other hand, the combination of the carrier and the active component is not firm, and the active component is easy to lose

[0006] CN105174299A discloses a catalyst with a two-layer or three-layer structure including silicon oxide, calcium oxide and alkali metal oxides, but the preparation process is relatively complicated, and layer-by-layer rolling ball forming has the problem of weak bonding between different shell layers, which causes shedding risk

[0007] The working liquid solvent system of traditional hydrogen peroxide production is heavy aromatics and trioctyl phosphate. Due to the low solubility of anthraquinone in it, the hydrogen efficiency is low. At present, many hydrogen peroxide devices in China have adopted the method of adding o-methylcyclohexyl to it. Acetate to improve the solubility of anthraquinone and thus improve the hydrogen efficiency

However, it has been found that o-methylcyclohexyl acetate will reduce the regeneration efficiency of clay or catalyst for degradation products

But how to improve catalyst for the regeneration efficiency of anthraquinone degradant in the hydrogen peroxide working fluid that contains o-methylcyclohexyl acetate, prior art does not have report

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