Operation process for hydrogenation reaction of anthraquinone work liquid during hydrogen perioxide production

Abstract

The present invention is operation process for hydrogenation reaction of anthraquinone work liquid during hydrogen peroxide production, and belongs to the field of hydrogen peroxide producing anthraquinone process technology. In a fixed bed reactor loaded with Pd / Al2O3 catalyst, anthraquinone work liquid and hydrogen are added from the top of the reactor. The method features the continuous addition of hydrogen, the periodical addition of anthraquinone work liquid in the period of 10-400 s, circulating fissionability of 0.1-0.9, reactor temperature of 40-70 deg.c and pressure of 101.3-400.0 KPa. The present invention has the advantages of easy control of the operation condition, raised reactor efficiency, obviously raised reaction conversion rate and selectivity.

Description

technical field [0001] The invention relates to an operation method for the hydrogenation reaction of anthraquinone working liquid in the production of hydrogen peroxide. It belongs to the technology of producing hydrogen peroxide by anthraquinone method. Background technique [0002] The production technology of hydrogen peroxide is mainly the automatic oxidation method of anthraquinone derivatives (anthraquinone method for short). Typical chemical reaction formula of anthraquinone method, see (1) and (2). [0003] [0004] where R is an alkyl group [0005] The reaction process is to hydrogenate the alkylanthraquinone in the working solution (the working solution is a solution of alkylanthraquinone dissolved in a suitable organic solvent) with hydrogen in the presence of a catalyst to generate the corresponding alkylhydroanthraquinone (see reaction Formula 1). After the hydroanthraquinone in the solvent is separated from the catalyst, it ...

AI Technical Summary

Problems solved by technology

The problem with this method of operation is that there is partial wetting of the catalyst particles in the fixed bed reactor, and the liquid phase is unevenly distributed in the axial and radial directions.

For the partial wetting phenomenon of catalyst particles, the gas phase must overcome the gas-liquid and liquid-solid mass transfer resistance in the wet part; in the non-wet part, the gas phase is more likely to be effectively transferred, so the reaction rate is increased, and it also leads to the reaction. Reduced selectivity

The uneven distribution of the liquid phase axis and radial direction will lead to low efficiency of local utilization of the reactor

The overall result is that due to the partial wetting of the catalyst particles or the partial non-wetting of the reactor, the reaction conversion rate and selectivity are low, and the effective anthraquinone is severely degraded, thus restricting the increase in production capacity

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