Novel hydrogenation system for preparing hydrogen peroxide by anthraquinone process

Abstract

According to the technical scheme, the novel hydrogenation system comprises a working solution inlet pipe and a hydrogen inlet pipe, the working solution inlet pipe and the hydrogen inlet pipe are connected to the top of a gas-liquid mixer, and a bottom outlet of the gas-liquid mixer is connected with a bottom inlet of a hydrogenation tower; a top outlet of the hydrogenation tower is connected with a side inlet of the gas-liquid separator, a bottom outlet of the gas-liquid separator is connected to a next working section, and an emptying pipeline is arranged at the top of the gas-liquid separator. The hydrogenation tower has the beneficial effects that the feeding and discharging modes of the hydrogenation tower are changed, the phenomenon of bias flow of a working solution in the hydrogenation tower is reduced, a catalyst is fully soaked in the working solution, the utilization rate of the catalyst is improved, the hydrogen efficiency of the hydrogenation solution is improved by 5-15%, and the yield of hydrogen peroxide is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of chemical industry relates to the production of hydrogen peroxide, concretely is a kind of hydrogenation system of anthraquinone method preparation hydrogen peroxide device. BACKGROUND

[0002] At present, the vast majority of domestic hydrogen peroxide production device is using anthraquinone method fixed bed process, using 2-ethylanthraquinone as carrier, C9~C10 heavy aromatic hydrocarbon, trioctyl phosphate, ortho-methylcyclohexyl acetate, four kinds of butyl urea are used as solvent to prepare working fluid, hydrogenation, oxidation, extraction, purification and other processes are obtained industrial grade hydrogen peroxide product.

[0003] In the process of anthraquinone method fixed bed production hydrogen peroxide, working fluid and hydrogen are usually entered hydrogenation tower from top, and bottom discharge, at this time, due to catalyst caking and other reasons, working fluid will appear bias flow phenomenon, at this time, working fluid is unevenly distributed in hydrogenation tower, part of catalyst cannot play effect, hydrogenation liquid hydrogen efficiency is reduced, and hydrogen peroxide production is reduced. SUMMARY

[0004] In view of the problems that catalyst caking is caused by working fluid and hydrogen top feeding and bottom discharging in the prior art, working fluid bias flow leads to hydrogen peroxide production reduction, the utility model provides a new hydrogenation system for anthraquinone method preparation hydrogen peroxide, and the technical scheme is as follows: working fluid inlet pipe and hydrogen inlet pipe are connected to the top of gas-liquid mixer, the bottom outlet of gas-liquid mixer is connected to the bottom inlet of hydrogenation tower, the top outlet of hydrogenation tower is connected to the side inlet of gas-liquid separator, the bottom outlet of gas-liquid separator is connected to the next section, and the top of gas-liquid separator is provided with vent pipe.

[0005] As a preferred scheme, the height of the hydrogen inlet pipe is higher than that of the working fluid inlet pipe, to prevent working fluid from entering the hydrogen inlet pipe.

[0006] As a preferred scheme, the bottom inlet of the hydrogenation tower is provided with a filter screen.

[0007] As a preferred scheme, the bottom outlet of the gas-liquid separator is connected to the working fluid inlet pipe in parallel, and a circulating pump is arranged on the pipeline.

[0008] As a preferred scheme, a hydrogen inlet valve is arranged on the hydrogen inlet pipe.

[0009] As a preferred scheme, a vent valve is arranged on the vent pipe.

[0010] As a preferred scheme, the gas-liquid mixer, hydrogenation tower and gas-liquid separator are all provided with heating jackets.

[0011] The utility model has the advantages that:

[0012] The utility model improves the feeding and discharging mode of the hydrogenation tower, reduces the phenomenon of working liquid bias flow in the hydrogenation tower, fully soaks the catalyst by the working liquid, improves the utilization rate of the catalyst, makes the hydrogen efficiency of the hydrogenation liquid improve 5-15%, and improves the output of hydrogen peroxide. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is system structure schematic diagram of the utility model.

[0014] In the drawing: 1, working liquid inlet pipe; 2, hydrogen inlet pipe; 201, hydrogen inlet valve; 3, gas-liquid mixer; 4, hydrogenation tower; 5, gas-liquid separator; 6, filter screen; 7, circulating pump; 8, venting pipeline; 801, venting valve; 9, heating jacket. DETAILED DESCRIPTION

[0015] The utility model will be further described in detail below according to the drawings and specific embodiments.

[0016] EMBODIMENT

[0017] As Figure 1 The utility model discloses a novel hydrogenation system of hydrogen peroxide prepared by anthraquinone method, including working liquid inlet pipe 1 and hydrogen inlet pipe 2, working liquid inlet pipe 1 and hydrogen inlet pipe 2 are connected to the top of gas-liquid mixer 3, and the bottom outlet of gas-liquid mixer 3 is connected to the bottom inlet of hydrogenation tower 4, and the top outlet of hydrogenation tower 4 is connected to the side inlet of gas-liquid separator 5, and the bottom outlet of gas-liquid separator 5 is connected to the next section, and the top of gas-liquid separator 5 is provided with venting pipeline 8.

[0018] Further, the height of the hydrogen inlet pipe 2 is higher than the height of the working liquid inlet pipe 1, to prevent the working liquid from flowing into the hydrogen inlet pipe 2.

[0019] Further, the bottom inlet of the hydrogenation tower 4 is provided with a filter screen 6 to prevent the catalyst from entering the pipeline and causing blockage.

[0020] Further, the bottom outlet of the gas-liquid separator 5 is connected to the working liquid inlet pipe 1 in parallel, and a circulating pump 7 is arranged on the pipeline to pump a part of the hydrogenation liquid after gas-liquid separation into the gas-liquid mixer 3 for recycling.

[0021] Further, the hydrogen inlet valve 201 is arranged on the hydrogen inlet pipe 2 to control the pressure at the top of the gas-liquid mixer 3 to be 0.17-0.30 MPa by adjusting the opening degree of the hydrogen inlet valve 201.

[0022] Further, the venting valve 801 is arranged on the venting pipeline 8 to control the pressure at the top of the hydrogenation tower to be 0.10-0.23 MPa by adjusting the opening degree of the venting valve 801.

[0023] Further, the gas-liquid mixer 3, the hydrogenation tower 4, and the gas-liquid separator 5 are each provided with a heating jacket 9, which controls the temperature in the gas-liquid mixer 3, the hydrogenation tower 4, and the gas-liquid separator 5 to be 45-55°C.

[0024] The hydrogenation process in the anthraquinone method hydrogen peroxide production device using the above system has the following operation process: the working liquid and hydrogen enter the gas-liquid mixer 3 through the working liquid inlet pipe 1 and the hydrogen inlet pipe 2, are preheated to 45-55°C by the heating jacket 9, and the pressure at the top of the gas-liquid mixer 3 is controlled to be 0.17-0.30 MPa by the hydrogen inlet valve 201; the mixed working liquid enters the hydrogenation tower 4 from the bottom inlet through the filter screen 6, and the working liquid and hydrogen fully react in the presence of the catalyst to obtain a mixture of hydrogenated liquid and hydrogen; the mixture enters the gas-liquid separator 5 for gas-liquid separation, the hydrogen is vented after treatment, the pressure at the top of the hydrogenation tower 4 is 0.10-0.23 MPa by the vent valve 801, 30-60% of the hydrogenated liquid is pumped into the gas-liquid mixer 3 again by the circulating pump 7 for recycling, and the remaining hydrogenated liquid enters the subsequent oxidation process.

Claims

1. A novel hydrogenation system for producing hydrogen peroxide using the anthraquinone process, characterized in that, It includes a working liquid inlet pipe (1) and a hydrogen inlet pipe (2), which are connected to the top of the gas-liquid mixer (3). The bottom outlet of the gas-liquid mixer (3) is connected to the bottom inlet of the hydrogenation tower (4). The top outlet of the hydrogenation tower (4) is connected to the side inlet of the gas-liquid separator (5). The bottom outlet of the gas-liquid separator (5) is connected to the next section. An vent pipe (8) is provided at the top of the gas-liquid separator (5).

2. The hydrogenation system for producing hydrogen peroxide using the anthraquinone process according to claim 1, characterized in that, The height of the hydrogen inlet pipe (2) is higher than that of the working fluid inlet pipe (1) to prevent the working fluid from entering the hydrogen inlet pipe (2).

3. The hydrogenation system for producing hydrogen peroxide using the anthraquinone process according to claim 1, characterized in that, The bottom inlet of the hydrogenation tower (4) is equipped with a filter screen (6).

4. The hydrogenation system for producing hydrogen peroxide using the anthraquinone process according to claim 1, characterized in that, The bottom outlet of the gas-liquid separator (5) is connected to the working liquid inlet pipe (1) via a parallel pipe, and a circulation pump (7) is installed on the pipe.

5. The hydrogenation system for producing hydrogen peroxide using the anthraquinone process according to claim 1, characterized in that, The hydrogen inlet pipe (2) is equipped with a hydrogen inlet valve (201).

6. The hydrogenation system for producing hydrogen peroxide using the anthraquinone process according to claim 1, characterized in that, The venting pipe (8) is equipped with a venting valve (801).

7. The hydrogenation system for producing hydrogen peroxide using the anthraquinone process according to claim 1, characterized in that, The gas-liquid mixer (3), hydrogenation tower (4), and gas-liquid separator (5) are all equipped with heating jackets (9).

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