Recycling device for hydrogen peroxide production hydrogenation tail gas

Abstract

The utility model discloses a hydrogen peroxide production hydrogenation tail gas recycling device, which belongs to the technical field of hydrogenation tail gas recycling devices and comprises a hydrogenation tower, a hydrogenation tail gas outlet of the hydrogenation tower is connected with a hydrogenation tail gas condenser, and the hydrogenation tail gas condenser is connected with a hydrogenation tail gas condensate receiving tank. A gas phase outlet at the top of the hydrogenated tail gas condensate receiving tank is connected with a hydrogenated tail gas coalescer, a liquid phase at the bottom of the hydrogenated tail gas coalescer is connected with an oil separation tank, a gas phase outlet at the top of the hydrogenated tail gas coalescer is connected with a waste liquid incinerator, and the other path of the gas phase outlet at the top of the hydrogenated tail gas condensate receiving tank is connected with a low-pressure torch; according to the device, aromatic hydrocarbon in tail gas is recycled and enters the waste liquid incinerator, meanwhile, hydrogen is separated out to serve as fuel of the low-pressure torch, resources are saved, and the environment is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogenation tail gas recovery and utilization devices, and specifically relates to a hydrogenation tail gas recovery and utilization device produced by hydrogen peroxide. Background Art

[0002] Hydrogen peroxide, also known as hydrogen peroxide, is an important inorganic compound. It is also known as the "greenest and cleanest" chemical because its decomposition products are only water and oxygen, which is pollution-free to the environment. It is currently widely used in papermaking, textiles, sewage treatment, organic synthesis, electronics, metallurgy and other fields. At present, the anthraquinone process uses 2-ethylanthraquinone (EAQ) as a carrier, heavy aromatics and trioctyl phosphate as a mixed solvent to form a working fluid, and palladium as a catalyst to alternately hydrogenate and oxidize EAQ. The production process includes four steps: hydrogenation reaction, oxidation reaction, extraction and post-treatment. Among them, the hydrogenation reaction is that EAQ is reduced to 2-ethylhydroanthraquinone by hydrogen under palladium catalysis. Among them, tail gas is generated in the hydrogenation reaction process.

[0003] Most of the exhaust gas components in the hydrogenation process are hydrogen, and some hydrogen peroxide manufacturers directly discharge it. According to statistics, the impact of hydrogen emissions on the climate is 11 times more serious than that of carbon dioxide. Therefore, direct emissions of hydrogen exhaust gas not only pollute the environment, but also cause waste of raw materials.

[0004] The existing tail gas treatment device only treats the hydrogenated tail gas produced by the hydrogenation tower, but ignores the hydrogenated tail gas entrained in the hydrogenation receiving tank. In addition, the tail gas treatment device simply condenses and collects the tail gas, and then releases the remaining gas into the atmosphere. The remaining gas is mixed with flammable gases such as hydrogen and aromatics. Directly releasing it into the atmosphere will cause energy waste, environmental pollution, and low energy utilization rate. Utility Model Content

[0005] In order to solve the above-mentioned deficiencies of the prior art, the utility model provides a device for recycling hydrogenated tail gas produced by hydrogen peroxide, and its technical solution includes:

[0006] A hydrogenation tower, wherein the hydrogenated tail gas outlet of the hydrogenation tower is connected to a hydrogenated tail gas condenser, the hydrogenated tail gas condenser is connected to a hydrogenated tail gas condensate receiving tank, the gas phase outlet at the top of the hydrogenated tail gas condensate receiving tank is connected to a hydrogenated tail gas coalescer, the liquid phase at the bottom of the hydrogenated tail gas coalescer is connected to a grease trap, the gas phase outlet at the top of the hydrogenated tail gas coalescer is connected to a waste liquid incinerator, and another gas phase outlet at the top of the hydrogenated tail gas condensate receiving tank is connected to a low-pressure flare.

[0007] Furthermore, a stop valve a is provided on the line between the hydrogenation tower and the hydrogenation tail gas condenser.

[0008] Furthermore, a stop valve b is provided on the line between the hydrogenated tail gas condenser and the hydrogenated tail gas condensate receiving tank, the liquid phase outlet at the bottom of the hydrogenated tail gas condensate receiving tank is connected to a grease trap, and a ball valve a, a quick opening valve a, an observation mirror a, and a ball valve b are provided on the line between the hydrogenated tail gas condensate receiving tank and the grease trap.

[0009] Furthermore, a stop valve c, a solenoid valve a, a stop valve d and a stop valve g are provided on the line between the hydrogenated tail gas condensate receiving tank and the hydrogenated tail gas coalescer, and a stop valve e is also connected in parallel on the line; a stop valve f and a stop valve h are provided on another pipeline connected to the low-pressure flare, and a quick-opening valve b is connected in parallel on the pipeline connected to the hydrogenated tail gas coalescer.

[0010] Furthermore, a solenoid valve b, a quick-cut valve a, a check valve and a stop valve j are arranged on the pipeline between the hydrogenation tail gas coalescer and the waste liquid incinerator.

[0011] Furthermore, it is characterized in that a ball valve c, a quick-cut valve b, an observation mirror b and a ball valve d are arranged on the pipeline between the hydrogenated tail gas coalescer and the grease trap.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The hydrogenated tail gas separated by the gas-liquid separator in the hydrogenation tower is condensed and the aromatics are recovered through the hydrogenated tail gas condensate receiving tank. It can be freely switched into two routes, one to the low-pressure flare and the other to the waste liquid incinerator. The exhaust gas passes through the hydrogenated tail gas agglomerator to further recover the aromatics and then enters the waste gas incinerator, fully recovering the aromatics in the tail gas. At the same time, hydrogen is fully utilized as fuel, realizing the recovery of aromatics in the hydrogenated tail gas and the utilization of combustible gas hydrogen, reducing the pollution of the hydrogenated tail gas to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the process of the utility model.

[0015] Figures: 1. Hydrogenation tower; 2. Stop valve a; 3. Hydrogenation tail gas condenser; 4. Stop valve b; 5. Hydrogenation tail gas condensate receiving tank; 6. Ball valve a; 7. Quick-opening valve a; 8. Observation mirror a; 9. Ball valve b; 10. Stop valve c; 11. Solenoid valve a; 12. Stop valve d; 13. Stop valve e; 14. Stop valve f; 15. Stop valve g; 16. Quick-opening valve b; 17. Stop valve h; 18. Hydrogenation tail gas coalescer; 19. Solenoid valve b; 20. Quick-cut valve a; 21. Check valve; 22. Stop valve j; 23. Ball valve c; 24. Quick-cut valve b; 25. Observation mirror b; 26 Ball valve d; 27. Waste liquid incinerator; 28. Grease trap. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0017] Example

[0018] like Figure 1 As shown:

[0019] A device for recycling hydrogenated tail gas produced by hydrogen peroxide comprises a hydrogenation tower 1, wherein the hydrogenated tail gas outlet of the hydrogenation tower 1 is connected to a hydrogenated tail gas condenser 3, the hydrogenated tail gas condenser 3 is connected to a hydrogenated tail gas condensate receiving tank 5, the gas phase outlet at the top of the hydrogenated tail gas condensate receiving tank 5 is connected to a hydrogenated tail gas coalescer 18, the liquid phase at the bottom of the hydrogenated tail gas coalescer 18 is connected to a grease trap 28, the gas phase outlet at the top of the hydrogenated tail gas coalescer 18 is connected to a waste liquid incinerator 27, and another gas phase outlet at the top of the hydrogenated tail gas condensate receiving tank 5 is connected to a low-pressure flare.

[0020] The hydrogenated tail gas separated by the gas-liquid separator in the hydrogenation tower 1 is condensed in the hydrogenated tail gas condenser 3, and then the aromatic hydrocarbons are recovered through the hydrogenated tail gas condensate receiving tank 5. The hydrogenated tail gas condenser 3 adopts a shell and tube heat exchanger and uses chilled water as the condensation medium. Since the main components of the hydrogenated tail gas are hydrogen and gaseous hydrogenated liquid, most of which are heavy aromatic hydrocarbons in the hydrogenated liquid, the hydrogenated tail gas enters the hydrogenated tail gas condenser 3 and exchanges heat with the chilled water (temperature is about 10°C) for cooling. The gaseous hydrogenated liquid in the hydrogenated tail gas is condensed into liquid. Hydrogen is a non-condensable gas and is still in gaseous state. The hydrogen and the liquid hydrogenated liquid enter the hydrogenated tail gas condensate receiving tank 5 together.

[0021] The hydrogen in the hydrogenated tail gas condensate receiving tank 5 is transported to the low-pressure flare through the gas phase outlet at the top of the hydrogenated tail gas condensate receiving tank 5 as fuel for the low-pressure flare. The liquid hydrogenated liquid enters the hydrogenated tail gas agglomerator 18 for storage and then is transported to the waste liquid incinerator 27 for incineration. The residual liquid in the hydrogenated tail gas agglomerator 18 enters the oil separator 28 for oil separation treatment.

[0022] A stop valve a2 is provided on the line between the hydrogenation tower 1 and the hydrogenation tail gas condenser 3 , which can be used to disconnect the line between the hydrogenation tower 1 and the hydrogenation tail gas condenser 3 .

[0023] A stop valve b4 is provided on the line between the hydrogenated tail gas condenser 3 and the hydrogenated tail gas condensate receiving tank 5, which is used to disconnect the line between the hydrogenated tail gas condenser 3 and the hydrogenated tail gas condensate receiving tank 5. The liquid phase outlet at the bottom of the hydrogenated tail gas condensate receiving tank 5 is connected to the oil separator 28. The residual liquid in the hydrogenated tail gas condensate receiving tank 5 enters the oil separator 28 for oil separation treatment. A ball valve a6, a quick opening valve a7, an observation mirror a8, and a ball valve b9 are provided on the line between the hydrogenated tail gas condensate receiving tank 5 and the oil separator 28. The observation mirror a8 can observe the material transportation situation in the line, and the ball valve a6, the quick opening valve a7, and the ball valve b9 are used to control the rapid opening or closing of the line.

[0024] The line between the hydrogenated tail gas condensate receiving tank 5 and the hydrogenated tail gas coalescer 18 is provided with a stop valve c10, a solenoid valve a11, a stop valve d12 and a stop valve g15, and the line is also connected in parallel with a stop valve e13. The stop valve c10, the solenoid valve a11, the stop valve d12 and the stop valve g15 control the opening or closing of the line. When the stop valve c10 fails, the stop valve g15 automatically opens to allow the material to be transported through this line. The other line connected to the low-pressure torch is provided with a stop valve c10, a solenoid valve a11, a stop valve d12 and a stop valve g15. A stop valve f14 and a stop valve h17 are installed, and a quick-opening valve b16 is connected in parallel on the pipeline of the hydrogenation tail gas coalescer 18. The other route is opened or closed through the stop valve f14 and the stop valve h17. When a pipeline failure occurs or the waste liquid incinerator 27 operates abnormally, resulting in pipeline pressure buildup, when the pressure triggers the interlock, the quick-opening valve b16 automatically opens, and then the quick-opening valve a20 closes, thereby switching the process to the low-pressure torch, and the interlock is set to manual reset to ensure production safety.

[0025] The pipeline between the hydrogenation tail gas coalescer 18 and the waste liquid incinerator 27 is provided with a solenoid valve b19, a quick-cut valve a20, a check valve 21 and a stop valve j22, and the opening or closing of the circuit is controlled by the combination of the above valves.

[0026] The pipeline between the hydrogenation tail gas coalescer 18 and the oil separator 28 is provided with a ball valve c23, a quick-cut valve b24, an observation mirror b25 and a ball valve d26. The observation mirror b25 observes the transportation of materials in the line, and the ball valve c23, the quick-cut valve b24 and the ball valve d26 control the opening or closing of the line.

Claims

1. A device for recycling hydrogenated tail gas from hydrogen peroxide production, comprising a hydrogenation tower (1), characterized in that: The hydrogenated tail gas outlet of the hydrogenation tower (1) is connected to the hydrogenated tail gas condenser (3), the hydrogenated tail gas condenser (3) is connected to the hydrogenated tail gas condensate receiving tank (5), the top gas phase outlet of the hydrogenated tail gas condensate receiving tank (5) is connected to the hydrogenated tail gas coalescer (18), the bottom liquid phase of the hydrogenated tail gas coalescer (18) is connected to the oil separator (28), the top gas phase outlet of the hydrogenated tail gas coalescer (18) is connected to the waste liquid incinerator (27), and the other gas phase outlet of the top gas phase outlet of the hydrogenated tail gas condensate receiving tank (5) is connected to a low-pressure flare.

2. The device for recycling hydrogenated tail gas produced by hydrogen peroxide according to claim 1, characterized in that: A stop valve a (2) is provided on the line between the hydrogenation tower (1) and the hydrogenation tail gas condenser (3).

3. The device for recycling hydrogenated tail gas produced by hydrogen peroxide according to claim 1, characterized in that: A stop valve b (4) is provided on the line between the hydrogenated tail gas condenser (3) and the hydrogenated tail gas condensate receiving tank (5); a liquid phase outlet at the bottom of the hydrogenated tail gas condensate receiving tank (5) is connected to a grease trap (28); and a ball valve a (6), a quick-opening valve a (7), an observation mirror a (8), and a ball valve b (9) are provided on the line between the hydrogenated tail gas condensate receiving tank (5) and the grease trap (28).

4. The device for recycling hydrogenated tail gas produced by hydrogen peroxide according to claim 1, characterized in that: A stop valve c (10), a solenoid valve a (11), a stop valve d (12) and a stop valve g (15) are provided on the line between the hydrogenated tail gas condensate receiving tank (5) and the hydrogenated tail gas coalescer (18), and a stop valve e (13) is also connected in parallel to the line. A stop valve f (14) and a stop valve h (17) are provided on another pipeline connected to the low-pressure flare, and a quick-opening valve b (16) is connected in parallel to the pipeline of the hydrogenated tail gas coalescer (18).

5. The device for recycling hydrogenated tail gas from hydrogen peroxide production according to claim 1, characterized in that: A solenoid valve b (19), a quick-cut valve a (20), a check valve (21) and a stop valve j (22) are provided on the pipeline between the hydrogenation tail gas coalescer (18) and the waste liquid incinerator (27).

6. The device for recycling hydrogenated tail gas from hydrogen peroxide production according to claim 1, characterized in that: A ball valve c (23), a quick-cut valve b (24), an observation mirror b (25) and a ball valve d (26) are provided on the pipeline between the hydrogenated tail gas coalescer (18) and the oil separator (28).

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