Regeneration process of working solution in hydrogen peroxide production process by anthraquinone method

Abstract

The invention discloses a regeneration process of a working solution in a process for producing hydrogen peroxide by an anthraquinone method, and relates to the technical field of industrial production of hydrogen peroxide by the anthraquinone method, in particular to a regeneration technology for reducing a hydrogenated anthraquinone degradation product generated in a hydrogenation process into 2-ethyl anthraquinone. According to the method, the steps of absorbing and removing non-free water by using concentrated alkali and separating the alkali are replaced by the steps of removing the non-free water by using a flash evaporation physical method, so that the water content in the working solution contacted with the activated aluminum oxide can be low enough, and the service life of the activated aluminum oxide is fully guaranteed. In the process, the influence of alkali on the activated aluminum oxide is avoided, so that the activated aluminum oxide works under a neutral condition, theproperties of the activated aluminum oxide are stable, the loss is low, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of industrial production of hydrogen peroxide by anthraquinone method, in particular to the regeneration technology of reducing hydrogenated anthraquinone degradation products (such as anthrone, etc.) produced in the hydrogenation process to 2-ethylanthraquinone, and removing Process technology in which most of the water keeps the catalyst active. Background technique [0002] Industrial-scale production of hydrogen peroxide (H 2 o 2 ) is the anthraquinone method, which mainly includes hydrogenation reaction process, oxidation reaction process, extraction and purification process, and regeneration process (also called post-treatment process). [0003] The hydrogenation reaction mechanism is: under the catalysis of palladium (Pd), 2-ethylanthraquinone and 2-ethyltetrahydroanthraquinone react with hydrogen to generate 2-ethylhydroanthraquinone and 2-ethyltetrahydroanthraquinone respectively quinones. The w...

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Problems solved by technology

[0010] 1. The water removal (raffination separator, alkali tower) and alkali removal (alkali separator) equipment requires a large volume, the amount of working fluid used for initial filling is large, and there are many auxiliary equipment (need to cooperate with the alkali distillation system), Equipment investment cost is high, occupying a large area

[0011] 2. The working fluid is all treated with activated alumina, the consumption of activated alumina per unit of hydrogen peroxide is high, and the volume of clay bed that needs to be configured with activated alumina is relatively large (the volume of a single clay bed for a hydrogen peroxide plant of 100,000 tons / year is about 130m 3 or so, three beds), and the amount of activated alumina loaded is relatively large (a total of about 150t)

[0012] 3. Due to the alkaline environment, the service life of activated alumina is only about 1 to 2 months. The main reason is that the activated alumina at the bottom of the clay bed is severely pulverized.

[0013] 4. Using concentrated potassium carbonate solution as a water absorbent in the raffinate separator requires a large amount of potassium carbonate, and potassium carbonate needs to be replaced regularly, resulting in a large amount of waste potassium carbonate liquid

[0014] 5. After the concentrated potassium carbonate solution absorbs a large amount of water, it becomes a dilute potassium carbonate solution, and a large amount of steam needs to be wasted to concentrate the dilute potassium carbonate solution into a concentrated potassium carbonate solution for reuse

[0015] In short, the traditional regeneration process not only fails to meet the requirements of green production, but also is not conducive to saving production

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