Hydrogen peroxide production tail gas treatment system

Abstract

The utility model discloses a hydrogen peroxide production tail gas treatment system, which relates to the technical field of tail gas treatment and comprises a gas adsorption tank internally provided with an adsorbent capable of adsorbing aromatic hydrocarbon; the tail gas header pipe is connected with the gas adsorption tank; the low-pressure steam conveying pipeline is connected with the gas adsorption tank; the emptying pipeline is connected with the gas adsorption tank; one end of the first condenser is connected with the gas adsorption tank; the recovery pipeline is connected with the other end of the first condenser; the wastewater adsorber is connected with the low-pressure steam conveying pipeline and the recovery pipeline; one end of the second condenser is connected with the wastewater adsorber, and the other end is connected with the recovery pipeline; one end of the circulating water tank is connected with the wastewater adsorber, and the other end is connected with the circulating water station; the cutting devices are arranged at the joints of the treatment system; according to the hydrogen peroxide production tail gas treatment system, efficient adsorption and desorption of aromatic hydrocarbon in oxidized tail gas can be achieved, the aromatic hydrocarbon is recycled, emission of tail gas and waste water is reduced, and the hydrogen peroxide production efficiency and benefits are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to a tail gas treatment system for hydrogen peroxide production. Background Art

[0002] Hydrogen peroxide is an important industrial chemical widely used in textile, paper, electronics, medicine and other industries. In the production process of hydrogen peroxide, oxidation tail gas containing aromatic hydrocarbons such as benzene, toluene, xylene, etc. is generated. These aromatic hydrocarbons are not only harmful to the environment and human body, but also valuable chemical raw materials, so they need to be effectively recovered and utilized.

[0003] At present, the commonly used methods for treating oxidized tail gas include absorption, adsorption, catalytic combustion, etc. Among them, the absorption method is a simple and easy method, which mainly uses water or other solvents to dissolve and separate the aromatic hydrocarbons in the tail gas, and then recovers them by distillation or extraction.

[0004] However, the disadvantages of this method are high solvent consumption, low recovery efficiency, and large equipment investment and operating costs. Utility Model Content

[0005] The utility model aims to provide a hydrogen peroxide production tail gas treatment system, which can realize efficient adsorption and desorption of aromatic hydrocarbons in oxidation tail gas, recover aromatic hydrocarbons and reduce the discharge of tail gas and wastewater, thereby improving the efficiency and benefits of hydrogen peroxide production.

[0006] The above-mentioned optimized structure of the utility model is realized by the following technical scheme: a hydrogen peroxide production tail gas treatment system, including a gas adsorption tank, in which an adsorbent capable of adsorbing aromatic hydrocarbons is arranged;

[0007] An exhaust manifold connected to the gas adsorption tank;

[0008] A low-pressure steam delivery pipeline connected to the gas adsorption tank;

[0009] A venting pipeline connected to the gas adsorption tank;

[0010] A first condenser, one end of which is connected to the gas adsorption tank;

[0011] A recovery pipeline connected to the other end of the first condenser;

[0012] A wastewater adsorber connected to both the low-pressure steam delivery pipeline and the recovery pipeline;

[0013] A second condenser, one end of which is connected to the wastewater adsorber, and the other end of which is connected to the recovery pipeline;

[0014] A circulating water tank, one end of which is connected to the wastewater adsorber, and the other end of which is connected to the circulating water station;

[0015] The cutting device is arranged at each connection of the processing system, and can realize the connection and cutting between each circuit of the processing system.

[0016] In some embodiments, the gas adsorption tank includes an air intake pipe connected to the exhaust manifold and the first condenser;

[0017] An air outlet pipe is connected to the low-pressure steam delivery pipeline and the venting pipeline.

[0018] In some embodiments, a purge pipeline is also included, connected to the air outlet pipe.

[0019] In some embodiments, the recovery line includes a separation tank connected to the first condenser and the second condenser;

[0020] A waste water tank connected to the first condenser, the second condenser, and the separation tank;

[0021] An aromatics storage tank is connected to the separation tank.

[0022] In some embodiments, the wastewater adsorber comprises

[0023] A wastewater inlet pipe connected to the low-pressure steam delivery pipeline and the wastewater tank;

[0024] The wastewater outlet pipe is connected to the second condenser.

[0025] In some embodiments, a wastewater pump is connected to the bottom of the wastewater tank, and the wastewater pump is connected to the wastewater inlet pipe and a sewage pipe.

[0026] In some embodiments, a clean water pump is connected between the circulating water tank and the circulating water station.

[0027] In some embodiments, the gas adsorption tank is connected to the circulating water tank, and a spray pump is provided between the discharge port of the circulating water tank and the gas adsorption tank.

[0028] In some embodiments, a backwash pump is connected between the feed inlet of the circulating water tank and the discharge outlet of the circulating water tank.

[0029] In some embodiments, a buffer tank is further connected between the first condenser and the recovery pipeline.

[0030] In summary, the utility model has the following beneficial effects:

[0031] This hydrogen peroxide production tail gas treatment system can efficiently adsorb and desorb aromatic hydrocarbons in the oxidation tail gas, realize the recovery and utilization of aromatic hydrocarbons, and improve the efficiency and benefits of hydrogen peroxide production; and use the wastewater adsorber to adsorb dissolved organic matter in the wastewater, reduce wastewater discharge, protect the environment, and at the same time recycle the adsorbed wastewater to save water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural diagram of the utility model.

[0033] In the figure: 1. gas adsorption tank; 2. tail gas main; 3. low-pressure steam transmission pipeline; 4. venting pipeline; 5. first condenser; 6. recovery pipeline; 61. separation tank; 62. wastewater tank; 63. aromatics storage tank; 7. wastewater adsorber; 8. second condenser; 9. circulating water tank. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] refer to Figure 1 A hydrogen peroxide production tail gas treatment system includes a gas adsorption tank 1, a tail gas main pipe 2, a low-pressure steam transmission pipeline 3, a venting pipeline 4, a first condenser 5, a recovery pipeline 6, a wastewater adsorber 7, a second condenser 8, a separation tank 61, a wastewater tank 62, an aromatics storage tank 63, a circulating water tank 9 and the like.

[0036] The gas adsorption tank 1 is provided with an adsorbent capable of adsorbing aromatic hydrocarbons; the adsorbent may be a resin capable of selectively adsorbing aromatic hydrocarbons in the oxidized tail gas; it includes an air inlet pipe and an air outlet pipe, the air inlet pipe is connected to the tail gas main pipe 2 and the first condenser 5; the air outlet pipe is connected to the low-pressure steam delivery pipeline 3 and the venting pipeline 4.

[0037] The tail gas main pipe 2 is connected to the oxidation tail gas outlet of the hydrogen peroxide production device at one end and to the gas adsorption tank 1 at the other end; it is used to transport the oxidation tail gas to the gas adsorption tank 1 for adsorption treatment.

[0038] The low-pressure steam delivery pipeline 3 is connected to the low-pressure steam source at one end and to the gas adsorption tank 1 at the other end, and is used to deliver low-pressure steam to the gas adsorption tank 1 to desorb the aromatic hydrocarbons adsorbed on the adsorbent and output them with the steam flow.

[0039] The venting pipeline 4 has one end connected to the gas adsorption tank 1 and the other end connected to the atmosphere; the tail gas of the adsorbed aromatic hydrocarbons can be vented.

[0040] The first condenser 5 is connected to the gas outlet pipe of the gas adsorption tank 1 at one end and to the recovery pipeline 6 at the other end, and can condense the steam gas flow output from the gas adsorption tank 1, so that the recovery pipeline 6 can separate and collect the aromatic hydrocarbons and water therein.

[0041] The recovery pipeline 6 includes a separation tank 61, a wastewater tank 62, and an aromatics storage tank 63. The separation tank 61 is connected to the first condenser 5, the second condenser 8, and the separation tank 61; the condensate output from the first condenser 5 and the second condenser 8 can be separated into oil and water, the separated aromatics can be transported to the aromatics storage tank 63 for recovery, and the separated wastewater can be transported to the wastewater tank 62 for treatment;

[0042] The wastewater tank 62 is connected to the first condenser 5, the second condenser 8, the separation tank 61 and the wastewater adsorber 7; the wastewater output from the separation tank can be collected and transported to the wastewater adsorber 7 for treatment;

[0043] The aromatics storage tank 63 is connected to the separation tank 61, and can collect the aromatics output from the separation tank 61 and transport them to an external pipeline for utilization.

[0044] The wastewater adsorber 7 includes a wastewater inlet pipe 71 and a wastewater outlet pipe 72. The wastewater inlet pipe 71 is connected to the low-pressure steam delivery pipeline 3 and the wastewater tank 62; the wastewater outlet pipe 72 is connected to the second condenser 8 and the feed port of the circulating water tank 9; the discharge port of the circulating water tank 9 is connected to the circulating water station; a clean water pump is connected between the circulating water tank 9 and the circulating water station; the wastewater output from the wastewater tank 62 can be adsorbed and treated, and the adsorbed wastewater can be transported to the circulating water tank 9 for recycling, which can be used as a gas The wastewater treatment system can be sprayed and recycled for the next time; and after the wastewater adsorber 7 is saturated, the steam transported by the steam transport pipeline 3 can be used to blow off and regenerate the wastewater adsorber 7, and the blown off tail gas is condensed by the second condenser 8 to form a condensate, which is collected in the separation tank 61 for oil-water separation, and the oil phase is recovered to the aromatics storage tank 63, and the water phase is sent to the wastewater tank 62, and the water phase is pumped into the wastewater inlet pipe 71 through the wastewater pump connected to the bottom of the wastewater tank 62, and finally flows to the circulating water tank 9 for recycling. The wastewater pump is also connected to a sewage pipe, which can discharge the wastewater in the system after the operation is completed.

[0045] A second condenser 8, one end of which is connected to the wastewater adsorber 7, and the other end of which is connected to the recovery pipeline 6;

[0046] The cutting device is arranged at each connection of the processing system, and can realize the connection and cutting between the various lines of the processing system. The cutting device can be a cutting valve arranged at each connection of the processing system. The cutting valve can be a hydraulic control valve or other control valve suitable for this system.

[0047] In some embodiments, the gas outlet pipe is connected to a purge pipeline, which may include a purge motor, and can deliver gas to the gas adsorption tank 1 to dry the adsorbent after desorption to prevent the adsorbent from being damp and affecting the adsorption effect.

[0048] In some embodiments, the gas adsorption tank 1 is connected to the circulating water tank 9, and a spray pump is provided between the discharge port of the circulating water tank 9 and the gas adsorption tank 1. During the regeneration process of the adsorbent steam in the gas adsorption tank 1, the gas adsorption tank 1 can be sprayed to initially cool down and reduce the cooling pressure of the first condenser 5.

[0049] In some embodiments, a backwash pump is connected between the feed port of the circulating water tank 9 and the discharge port of the circulating water tank 9 to clean the circulating water tank 9 .

[0050] In some embodiments, a buffer tank is further connected between the first condenser 5 and the recovery pipeline 6. After passing through the first condenser 5, the condensate enters the buffer tank to form a liquid seal, thereby preventing the steam from entering the recovery pipeline 6 without being condensed.

[0051] In some embodiments, the cut-off device can be connected to an intelligent control program to achieve automated control. The pipeline can be automatically switched by setting the adsorption and regeneration time to avoid excessive organic matter content in the exhaust gas after the resin is saturated with adsorption, thereby ensuring the stability and reliability of exhaust gas treatment.

[0052] The specific working principle is as follows:

[0053] The gas adsorption tank 1, the tail gas main pipe 2 and the venting pipe 4 are connected by the cutting device, the tail gas main pipe 2 transports the oxidized tail gas to the gas adsorption tank 1 for desorption, and the desorbed oxidized tail gas is discharged through the venting pipe 4;

[0054] When the adsorbent in the gas adsorption tank 1 is saturated, the cut-off device is adjusted to connect the gas adsorption tank 1, the low-pressure steam delivery pipeline 3, the first condenser 5, the buffer tank, the recovery pipeline 6, and the circulating water tank 9. The low-pressure steam delivery pipeline 3 delivers steam into the gas adsorption tank 1. The adsorbent is desorbed and regenerated under the action of the steam, and the initial cooling is achieved through the spraying action of the circulating water tank 9. After the condensation action of the first condenser 5, a condensate is formed. The condensate passes through the separation tank 61 for oil-water separation, and the oil phase is recovered to the aromatics storage tank 63, and the water phase is stored in the wastewater tank 62.

[0055] After the adsorbent is desorbed and regenerated, the cut-off device is adjusted to connect the wastewater tank 62, the wastewater adsorber 7 and the circulating water tank 9. The wastewater in the wastewater tank 62 is pumped into the wastewater adsorber 7 by the wastewater pump. The dissolved organic matter in the wastewater is removed by the wastewater adsorber 7. The treated wastewater is collected in the circulating water tank 9 and used as the next spray cycle for the gas treatment system.

[0056] When the wastewater adsorber 7 is saturated, the cut-off device is adjusted to connect the low-pressure steam delivery pipeline 3, the wastewater adsorber 7, the second condenser 8, the wastewater tank 62, and the circulating water tank 9. The low-pressure steam delivery pipeline 3 delivers steam to the wastewater adsorber 7, and the wastewater adsorber 7 is blown off and regenerated. The blown-off tail gas is condensed by the second condenser 8 to form a condensate, which flows into the separation tank 61 for oil-water separation, and the oil phase is recovered to the aromatics storage tank 63, the water phase to the wastewater tank 62, and then to the circulating water tank 9 under the action of the wastewater pump, and is used as the gas treatment system for the next spray cycle.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen peroxide production tail gas treatment system, characterized in that: It comprises a gas adsorption tank (1) in which an adsorbent capable of adsorbing aromatic hydrocarbons is arranged; An exhaust main pipe (2) connected to the gas adsorption tank (1); A low-pressure steam delivery pipeline (3) connected to the gas adsorption tank (1); A venting pipeline (4) connected to the gas adsorption tank (1); A first condenser (5), one end of which is connected to the gas adsorption tank (1); A recovery pipeline (6) connected to the other end of the first condenser (5); A wastewater adsorber (7) connected to both the low-pressure steam delivery pipeline (3) and the recovery pipeline (6); a second condenser (8), one end of which is connected to the wastewater adsorber (7), and the other end of which is connected to the recovery pipeline (6); A circulating water tank (9), one end of which is connected to the wastewater adsorber (7), and the other end of which is connected to a circulating water station; The cutting device is arranged at each connection of the processing system, and can realize the connection and cutting between each circuit of the processing system.

2. A hydrogen peroxide production tail gas treatment system according to claim 1, characterized in that: The gas adsorption tank (1) comprises an air intake pipe connected to the exhaust gas main pipe (2) and the first condenser (5); The air outlet pipe is connected to the low-pressure steam delivery pipeline (3) and the venting pipeline (4).

3. A hydrogen peroxide production tail gas treatment system according to claim 2, characterized in that: It also includes a purge pipeline connected to the air outlet pipe.

4. A hydrogen peroxide production tail gas treatment system according to claim 1, characterized in that: The recovery pipeline (6) comprises A separation tank (61) connected to the first condenser (5) and the second condenser (8); A waste water tank (62) connected to the first condenser (5), the second condenser (8), and the separation tank (61); The aromatics storage tank (63) is connected to the separation tank (61).

5. A hydrogen peroxide production tail gas treatment system according to claim 4, characterized in that: The wastewater adsorber (7) comprises A wastewater inlet pipe (71) connected to the low-pressure steam delivery pipeline (3) and the wastewater tank (62); The wastewater outlet pipe (72) is connected to the second condenser (8).

6. A hydrogen peroxide production tail gas treatment system according to claim 5, characterized in that: The bottom of the wastewater tank (62) is connected to a wastewater pump, and the wastewater pump is connected to the wastewater inlet pipe (71) and a sewage discharge pipe.

7. A hydrogen peroxide production tail gas treatment system according to claim 1, characterized in that: A clean water pump is connected between the circulating water tank (9) and the circulating water station.

8. A hydrogen peroxide production tail gas treatment system according to claim 1, characterized in that: The gas adsorption tank (1) is connected to the circulating water tank (9), and a spray pump is provided between the discharge port of the circulating water tank (9) and the gas adsorption tank (1).

9. A hydrogen peroxide production tail gas treatment system according to claim 1, characterized in that: A backwash pump is connected between the feed inlet of the circulating water tank (9) and the discharge outlet of the circulating water tank (9).

10. A hydrogen peroxide production tail gas treatment system according to claim 1, characterized in that: A buffer tank is also connected between the first condenser (5) and the recovery pipeline (6).

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