Hydrogenation tail gas recycling device for anthraquinone method hydrogen peroxide production

Abstract

The application discloses a circulating device for hydrogenation tail gas of hydrogen peroxide produced by an anthraquinone method, which comprises a hydrogenation tail gas cooler (2) connected with a hydrogenation tower (1), a gas-liquid separator (3) connected with the hydrogenation tail gas cooler (2), an aromatic hydrocarbon recovery tank (4) connected with the gas-liquid separator (3), a tail gas filter (5) connected with the gas-liquid separator (3), a tail gas circulating compressor (6) connected with the tail gas filter (5), a circulating gas cooler (7) with an air inlet connected with the tail gas circulating compressor (6) and an air outlet connected with the hydrogenation tower (1) through a pipeline, and a hydrogen supplement pipe (8) connected with the connecting pipeline of the circulating gas cooler (7) and the hydrogenation tower (1). The technical scheme provided by the application can recycle the tail gas of the hydrogenation tower.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen peroxide production technology, and in particular to a hydrogen peroxide hydrogenation tail gas recycling device for the anthraquinone process. Background Technology

[0002] Hydrogen peroxide is an oxidant with wide applications in the chemical industry. Currently, industrially, hydrogen peroxide is generally produced using the anthraquinone process. In this process, 2-ethylanthraquinone, 2-butylanthraquinone, 2-pentylanthraquinone, or mixtures thereof are typically used as a carrier, and a mixture of heavy aromatics, trioctyl phosphate, o-methylcyclohexyl acetate, tetrabutylurea, or diisobutylmethanol is used as a solvent. The carrier and solvent are combined in a specific ratio to form the working solution. The working solution circulates in the system in the order of hydrogenation, oxidation, extraction, and post-treatment, producing hydrogen peroxide. In the hydrogenation step, the working solution undergoes a hydrogenation reaction under the action of a catalyst to obtain a hydrogenated solution. In the oxidation step, the hydrogenated solution reacts with oxygen to obtain an oxidized solution. In the extraction step, hydrogen peroxide in the oxidized solution is extracted with water to obtain crude hydrogen peroxide; the working solution flowing out of the extraction step is called the raffinate. In the post-treatment step, the raffinate undergoes dehydration, hydrogen peroxide removal, and regeneration of degradation products before entering the working solution storage tank, completing one cycle.

[0003] Depending on the reactor type used in the hydrogenation process, the anthraquinone process for producing hydrogen peroxide can be divided into fixed-bed and fluidized-bed processes. Currently, most hydrogen peroxide production plants in my country use the traditional fixed-bed process. Compared with the fixed-bed process, the fluidized-bed process has advantages such as uniform gas-liquid-solid three-phase mixing, good catalyst dispersion, high catalyst utilization, and good mass and heat transfer. It also has higher hydrogenation efficiency and less degradation of effective anthraquinone, making it suitable for large-scale hydrogen peroxide plants.

[0004] Currently, the exhaust gas from hydrogenation towers is directly emitted after being treated by an in-tower demister. Because hydrogenation reactions typically occur at high temperatures, the exhaust gas often contains high concentrations of gaseous aromatics. This direct emission not only pollutes the environment but also leads to significant losses of aromatics and hydrogen, resulting in a double waste of resources and economic benefits.

[0005] If a hydrogen peroxide hydrogenation tail gas recycling device can be developed for the anthraquinone process, the tail gas of the hydrogenation tower can be effectively utilized, thus achieving efficient resource recovery and utilization. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hydrogen peroxide hydrogenation tail gas recycling device for the anthraquinone process, which can realize the recycling of the tail gas of the hydrogenation tower.

[0007] To solve the above-mentioned technical problems, the present invention provides a hydrogen peroxide hydrogenation tail gas circulation device for the anthraquinone process, comprising a hydrogenation tail gas cooler connected to a first medium inlet and a hydrogenation tower, a gas-liquid separator connected to a feed inlet and a first medium outlet of the hydrogenation tail gas cooler, an aromatic hydrocarbon recovery tank connected to the liquid outlet of the gas-liquid separator, a tail gas filter connected to an inlet and an outlet of the gas-liquid separator, a tail gas circulation compressor connected to an inlet and an outlet of the tail gas filter, and a circulation gas cooler connected to an inlet and an outlet of the tail gas circulation compressor, the outlet of which is connected to the hydrogenation tower via a pipeline; a hydrogen supply pipe is connected to the connecting pipeline between the circulation gas cooler and the hydrogenation tower.

[0008] As a preferred improved technical solution, the anthraquinone process hydrogen peroxide hydrogenation tail gas recycling device provided by this utility model has a gas-liquid separator as the cyclone separator.

[0009] The technical solution provided by this utility model can recycle the exhaust gas of the hydrogenation tower, thereby achieving efficient recovery and utilization of resources. Attached Figure Description

[0010] The accompanying drawings are provided to further illustrate the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. In the drawings:

[0011] Figure 1 This is a schematic diagram of the structure of the hydrogen peroxide hydrogenation tail gas recirculation device for the anthraquinone process in an example. Implementation

[0012] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0013] like Figure 1 The anthraquinone process hydrogen peroxide production hydrogenation tail gas recycling device shown includes a hydrogenation tail gas cooler 2 connected to a first medium inlet and a hydrogenation tower 1; a gas-liquid separator 3 connected to a feed inlet and a first medium outlet of the hydrogenation tail gas cooler 2; an aromatic hydrocarbon recovery tank 4 connected to the liquid outlet of the gas-liquid separator 3; a tail gas filter 5 connected to an inlet and an outlet of the gas-liquid separator 3; a tail gas recycling compressor 6 connected to an inlet and an outlet of the tail gas filter 5; and a recycling gas cooler 7 connected to an outlet of the recycling compressor 6 and an outlet connected to the hydrogenation tower 1 via a pipeline. A hydrogen supply pipe 8 is connected to the pipeline connecting the recycling gas cooler 7 and the hydrogenation tower 1. Figure 1 As shown, the hydrogenation tower 1, hydrogenation tail gas cooler 2, liquid separator 3, aromatics recovery tank 4, tail gas filter 5, tail gas recirculation compressor 6, and recirculation gas cooler 7 are interconnected by pipelines.

[0014] As one example, such as Figure 1 The gas-liquid separator 3 in the anthraquinone process hydrogen peroxide hydrogenation tail gas recirculation device shown is a cyclone separator.

[0015] Working principle:

[0016] In the anthraquinone process for producing hydrogen peroxide, excessive hydrogenation depth can easily lead to degradation products. These degradation products reduce the effective anthraquinone content in the system and alter the properties of the working fluid, such as increasing density and viscosity, causing numerous adverse effects on the production process. Therefore, the hydrogenation depth in the anthraquinone process for hydrogen peroxide production is typically controlled at 50-60%. The hydrogenation tail gas contains hydrogen, nitrogen, and entrained aromatic hydrocarbons from the working fluid.

[0017] Unreacted hydrogen and nitrogen in hydrogenation tower 1 are cooled by tail gas cooler 2, where any aromatics are liquefied. The gas-liquid mixture enters gas-liquid separator 3 for separation, and the liquefied aromatics are recovered to aromatics recovery tank 4. The separated gas is filtered by tail gas filter 5 to remove entrained solid particles, ensuring the safe operation of subsequent tail gas recirculation compressor 6. The filtered gas is pressurized by tail gas recirculation compressor 6 and then sent to recirculation gas cooler 7 for further cooling. It is then mixed with high-purity hydrogen from the hydrogen supply system, and the mixed gas is evenly distributed into hydrogenation tower 1 through gas distributor at the bottom of the tower. The aromatics recovered in aromatics recovery tank 4 can be recycled and reused in the system.

[0018] Due to the high nitrogen content in the exhaust gas, the partial pressure of hydrogen in the mixed gas after mixing with high-purity hydrogen is significantly reduced, while the gas flow rate entering the hydrogenation tower increases substantially. This effectively improves the bubbling effect of the fluidized bed, resulting in a more uniform catalyst distribution within hydrogenation tower 1, thereby enhancing hydrogenation efficiency. Furthermore, the generation of degradation products is significantly reduced, further optimizing the stability and economy of the production process.

[0019] The technical solution provided by this utility model can effectively utilize the exhaust gas of the hydrogenation tower and achieve efficient resource recovery and utilization.

[0020] The above description is merely a preferred embodiment of this utility model and does not limit this utility model in any way. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for recycling hydrogen peroxide hydrogenation tail gas produced by the anthraquinone process, characterized in that, The system includes a hydrogenation tail gas cooler (2) connected to the first medium inlet and the hydrogenation tower (1), a gas-liquid separator (3) connected to the first medium outlet of the hydrogenation tail gas cooler (2) via the feed inlet, an aromatic recovery tank (4) connected to the liquid outlet of the gas-liquid separator (3), a tail gas filter (5) connected to the gas outlet of the gas-liquid separator (3) via the gas inlet, a tail gas recirculation compressor (6) connected to the gas outlet of the tail gas filter (5) via the gas inlet, and a recirculation gas cooler (7) connected to the gas outlet of the recirculation compressor (6) via the gas inlet and connected to the hydrogenation tower (1) via a pipeline; a hydrogen supply pipe (8) is connected to the connecting pipeline between the recirculation gas cooler (7) and the hydrogenation tower (1).

2. The anthraquinone process hydrogen peroxide hydrogenation tail gas recycling device according to claim 1, characterized in that, The gas-liquid separator (3) is a cyclone separator.

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