Regeneration system for raffinate in process for producing hydrogen peroxide by anthraquinone method

Abstract

The invention discloses a regeneration system for the raffinate in a process for producing hydrogen peroxide by an anthraquinone method and relates to the technical field of industrial production of hydrogen peroxide by an anthraquinone method. The regeneration system comprises a raffinate pipeline, a carclazyte bed and a regenerated liquid storage tank; according to the direction from the liquidinlet to the liquid outlet, a liquid outlet of the raffinate pipeline is sequentially connected with a coalescer, a primary flash evaporator, a secondary flash evaporator and a carclazyte bed feedingpump; a liquid outlet of the carclazyte bed feeding pump is connected with a tube pass liquid inlet of the heat exchanger, a tube pass liquid outlet of the heat exchanger is connected with the heater,a liquid outlet of the heater is connected with a liquid inlet of the carclazyte bed, a liquid outlet of the carclazyte bed is connected with a shell pass liquid inlet of the heat exchanger, and a shell pass liquid outlet of the heat exchanger is connected with the regenerated liquid storage tank; the first-stage flash evaporator is further connected with a first-stage condenser, and the first-stage condenser is connected with a first vacuum unit; the second-stage flash evaporator is further connected with a second-stage condenser, and the second-stage condenser is connected with a second vacuum unit; and the liquid outlet of the primary flash evaporator is connected with the regenerated liquid storage tank. The production cost can be saved, and the green production requirement can be guaranteed.

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 quinone. The wo...

AI Technical Summary

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 the clay bed that needs to be placed with activated alumina is relatively large (100,000 tons / year device is about 130m3, three beds), and the activity of the filling A large amount of alumina (a total of about 150t installed)

[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, and the activated alumina is easily lost.

[0013] 4. The volume of water and alkali removal equipment and regeneration equipment in the regeneration process of the traditional process is large, and the amount of working fluid used for initial filling is large

[0014] 5. The use of potassium carbonate in the raffinate separator as an adsorption dewatering agent 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

[0015] 6. Concentrated potassium carbonate absorbs a large amount of water and turns into 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 alkali for reuse

[0016] 7. In the regeneration process of the traditional process, because all the working fluid passes through the clay bed, and the service life is short, the consumption of alumina per unit of hydrogen peroxide is high

[0017] In short, the traditional regeneration process not only cannot meet the requirements of green production, but also is not conducive to saving production

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