System and method for safe decomposition of hydrogen peroxide

Abstract

The application provides a system and method for safe decomposition of hydrogen peroxide. The system comprises a buffer tank, which comprises a liquid inlet, a liquid outlet and a gas outlet, and the liquid inlet is connected to the reaction liquid outlet of an oxidation reaction system using hydrogen peroxide as an oxidant, and the liquid outlet is connected to a downstream separation system, which is used to receive the reaction liquid containing hydrogen peroxide and decompose the hydrogen peroxide therein, discharge oxygen-containing tail gas, and output the deoxygenated reaction liquid to the downstream separation system. The method is to use the above-mentioned system to safely decompose hydrogen peroxide. The system and method can ensure that the hydrogen peroxide that has not been completely converted in the reaction liquid is completely converted into oxidation and discharged in the buffer tank between the oxidation reaction system and the downstream separation system, so that the deoxygenated reaction liquid will not explode even if there is flammable gas in the downstream separation system when it is sent to the downstream separation system, thereby improving the safety of operation.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment, specifically relating to a system and method for the safe decomposition of hydrogen peroxide. Background Technology

[0002] Hydrogen peroxide, as a green chemical, produces and uses virtually no pollution and has wide applications as an oxidant. However, although hydrogen peroxide itself is non-flammable and relatively stable, it can react with combustibles, releasing a large amount of heat, and poses a risk of decomposition and oxygen production, especially when in contact with incompatible impurities. Therefore, in oxidation reactions using hydrogen peroxide as an oxidant, if the reaction is incomplete, the reaction liquid output from the oxidation reaction system will contain hydrogen peroxide. When this hydrogen peroxide enters the downstream separation system, it will produce oxygen at an uncontrollable rate. If flammable gases are present in the downstream separation system, there is a risk of internal explosion. Current treatment processes cannot solve these technical problems. Summary of the Invention

[0003] The first objective of this invention is to provide a system for the safe decomposition of hydrogen peroxide, which can safely decompose hydrogen peroxide in a reaction solution containing hydrogen peroxide into oxygen and remove it, and output the deoxygenated reaction solution for delivery to a subsequent separation system.

[0004] The second objective of this invention is to provide a method for the safe decomposition of hydrogen peroxide, which utilizes the aforementioned system to safely decompose hydrogen peroxide in a reaction solution containing hydrogen peroxide into oxygen and remove it, and output the deoxygenated reaction solution for delivery to a subsequent separation system.

[0005] To achieve the first objective of this invention, the following technical solution is adopted:

[0006] A system for the safe decomposition of hydrogen peroxide, the system comprising a buffer tank, the buffer tank including a liquid inlet, a liquid outlet, and a gas outlet, wherein the liquid inlet is connected to the reaction liquid outlet of an oxidation reaction system using hydrogen peroxide as an oxidant, and the liquid outlet is connected to a downstream separation system for receiving the reaction liquid containing hydrogen peroxide from the oxidation reaction system and decomposing the hydrogen peroxide therein, discharging oxygen-containing tail gas, and outputting the deoxygenated reaction liquid to the downstream separation system.

[0007] The system for the safe decomposition of hydrogen peroxide of the present invention preferably includes a buffer tank further comprising an air inlet connected to a nitrogen replenishment unit for replenishing nitrogen from the nitrogen replenishment unit to dilute the oxygen produced during decomposition.

[0008] The system for the safe decomposition of hydrogen peroxide of the present invention preferably includes a nitrogen replenishment unit comprising a nitrogen replenishment pipeline connected to the inlet of the buffer tank for replenishing nitrogen therein; preferably, a first pressure regulating valve is provided on the nitrogen replenishment pipeline to form a first pressure control loop for controlling the flow rate of nitrogen replenished into the buffer tank; preferably, a first flow limiting orifice plate is provided on the first pressure control loop, and the first flow limiting orifice plate is arranged in parallel with the first pressure regulating valve.

[0009] In the system for the safe decomposition of hydrogen peroxide of the present invention, preferably, a first pressure indicator controller is also provided on the top of the buffer tank and is electrically connected to the first pressure regulating valve. The first pressure indicator controller is used to measure the pressure in the buffer tank and convert it into a current signal that is linearly related to the pressure measurement value and send it to the first pressure regulating valve to control its opening.

[0010] The system for the safe decomposition of hydrogen peroxide of the present invention preferably includes a nitrogen replenishment unit that further includes a pipeline nitrogen line connected to the nitrogen replenishment line for replenishing nitrogen through the pipeline network.

[0011] The system for the safe decomposition of hydrogen peroxide of the present invention preferably includes a nitrogen replenishment unit that further includes a nitrogen storage tank and a nitrogen pipeline. The two ends of the nitrogen pipeline are respectively connected to the nitrogen storage tank and the nitrogen replenishment pipeline, for replenishing nitrogen through the nitrogen storage tank.

[0012] The system for the safe decomposition of hydrogen peroxide of the present invention preferably includes a second pressure regulating valve on the nitrogen pipeline of the storage tank, forming a second pressure control loop for controlling the nitrogen output flow rate of the nitrogen storage tank.

[0013] The system for the safe decomposition of hydrogen peroxide of the present invention preferably includes a second pressure indicator controller on the nitrogen pipeline of the storage tank, which is located downstream of the second pressure regulating valve along the gas flow direction and is electrically connected to the second pressure regulating valve. The second pressure indicator controller measures the pressure in the nitrogen pipeline of the storage tank and converts it into a current signal that is linearly related to the pressure measurement value, which is then sent to the second pressure regulating valve to control its opening.

[0014] The system for safe decomposition of hydrogen peroxide of the present invention preferably includes a pressure reducing valve in the second pressure control circuit. One end of the pressure reducing valve is located at the inlet end of the second pressure regulating valve, and the other end is located downstream of the second pressure indicating controller along the gas flow direction, for reducing pressure and diverting the nitrogen pipeline of the storage tank.

[0015] The system for the safe decomposition of hydrogen peroxide of the present invention preferably further includes an oxygen-containing tail gas pipeline, the two ends of which are respectively connected to the buffer tank and a downstream gas treatment system, for outputting the oxygen-containing tail gas from the buffer tank to the downstream gas treatment system.

[0016] The system for the safe decomposition of hydrogen peroxide of the present invention preferably includes a flow regulating valve on the oxygen-containing tail gas pipeline to form a flow control loop for controlling the flow rate of the oxygen-containing tail gas output from the buffer tank; preferably, a second flow limiting orifice plate is provided on the flow control loop, and the second flow limiting orifice plate is connected in parallel with the flow regulating valve.

[0017] The system for safe decomposition of hydrogen peroxide of the present invention preferably includes a flow indicator controller on the oxygen-containing exhaust gas pipeline, which is located upstream of the flow regulating valve along the gas flow direction and is electrically connected to the flow regulating valve. The flow indicator controller measures the flow rate of the oxygen-containing exhaust gas in the oxygen-containing exhaust gas pipeline and converts it into a current signal that is linearly related to the flow rate of the oxygen-containing exhaust gas, which is then sent to the flow regulating valve to control its opening.

[0018] The system for the safe decomposition of hydrogen peroxide of the present invention preferably further includes an oxygen analyzer unit and a selection processor;

[0019] The signal receiving end of the selection processor is electrically connected to the flow indicator controller, and the signal transmitting end of the selection processor is electrically connected to the flow regulating valve. The flow indicator controller is electrically connected to the flow regulating valve through the selection processor. The signal receiving end of the oxygen analyzer unit is connected to the top of the buffer tank, and the signal transmitting end of the oxygen analyzer unit is connected to the signal receiving end of the selection processor. This is used to detect and analyze the oxygen content of the oxygen-containing exhaust gas in the buffer tank using the oxygen analyzer unit, and convert it into a current signal that is linearly related to its oxygen content. Then, the selection processor receives the current signals from the oxygen analyzer unit and the flow indicator controller, selects one of them according to the maximum allowable oxygen content, and sends the selected current signal to the flow regulating valve to control and adjust its opening. Specifically, when the oxygen content represented by the current signal sent by the oxygen analyzer unit is greater than the maximum allowable oxygen content, the selection processor selects the current signal sent by the oxygen analyzer unit to control the flow regulating valve; when the oxygen content represented by the current signal sent by the oxygen analyzer unit is less than or equal to the maximum allowable oxygen content, the selection processor selects the current signal sent by the flow indicator controller to control the flow regulating valve.

[0020] The system for the safe decomposition of hydrogen peroxide of the present invention preferably includes an oxygen analyzer unit connected in series with an oxygen analyzer group and a median selector. The oxygen analyzer group includes three oxygen analyzers connected in parallel, which are used to detect and analyze the oxygen content in the buffer tank and convert it into three current signals that are linearly related to the oxygen content, which are then sent to the median selector. The median selector then selects the current signal that represents the median oxygen content and sends it to the selection processor.

[0021] To achieve the second objective of this invention, a method for the safe decomposition of hydrogen peroxide is also provided. This method utilizes the aforementioned system to safely decompose hydrogen peroxide; specifically, it includes:

[0022] The reaction solution containing hydrogen peroxide is passed into the buffer tank for safe decomposition of hydrogen peroxide and output of oxygen-containing tail gas. The deoxygenated reaction solution is then sent to the downstream separation system for further processing.

[0023] Preferably, the decomposition within the buffer tank includes the following steps:

[0024] (1) While the hydrogen peroxide-containing reaction solution is introduced into the buffer tank for safe decomposition of hydrogen peroxide, nitrogen is supplied to the buffer tank through the nitrogen supply line to dilute the oxygen produced by decomposition; preferably, the flow rate of nitrogen supplied to the buffer tank is adjusted by the first pressure regulating valve; preferably, when the first pressure regulating valve fails, nitrogen is supplied to the buffer tank through the first flow limiting orifice plate; preferably, the pressure in the buffer tank is measured by the first pressure indicating controller and converted into a current signal that is linearly related to the pressure measurement value and sent to the first pressure regulating valve to control its opening.

[0025] (2) While the buffer tank outputs oxygen-containing tail gas, the flow rate of the oxygen-containing tail gas output from the buffer tank is controlled by the flow regulating valve; preferably, when the flow regulating valve fails, the oxygen-containing tail gas is output from the buffer tank through the second flow limiting orifice plate; preferably, the flow indicator controller is used to measure the flow rate of the oxygen-containing tail gas in the oxygen-containing tail gas pipeline and convert it into a current signal that is linearly related to the flow rate of the oxygen-containing tail gas and send it to the flow regulating valve to control its opening.

[0026] The present invention provides a method for the safe decomposition of hydrogen peroxide. Preferably, in step (1), nitrogen is introduced into the nitrogen replenishment pipeline through the nitrogen pipeline network to replenish nitrogen into the buffer tank through the pipeline network.

[0027] The present invention provides a method for the safe decomposition of hydrogen peroxide. Preferably, in step (1), nitrogen is introduced into the nitrogen replenishment pipeline through the nitrogen storage tank and the nitrogen pipeline of the storage tank to replenish nitrogen into the buffer tank through the nitrogen storage tank; preferably, the nitrogen output flow rate of the nitrogen storage tank is controlled by the second pressure regulating valve; preferably, the pressure in the nitrogen pipeline of the storage tank is measured by the second pressure indicating controller and converted into a current signal that is linearly related to the pressure measurement value and sent to the second pressure regulating valve to control its opening; preferably, the pressure reducing valve is used to reduce the pressure and divert the nitrogen pipeline of the storage tank.

[0028] In the method for the safe decomposition of hydrogen peroxide according to the present invention, preferably, in step (2), the oxygen analyzer unit detects and analyzes the oxygen content in the buffer tank and converts it into a current signal that is linearly related to the oxygen content and sends it; then, the selection processor receives the current signals from the oxygen analyzer unit and the flow indicator controller respectively, selects one of them according to the maximum allowable oxygen content, and sends the selected current signal to the flow regulating valve to control and adjust its opening; wherein, when the oxygen content represented by the current signal sent by the oxygen analyzer unit is greater than the maximum allowable oxygen content, the selection processor selects the current signal sent by the oxygen analyzer unit. The current signal controls the flow regulating valve; when the oxygen content represented by the current signal sent by the oxygen analyzer unit is less than or equal to the maximum allowable oxygen content of the system, the selection processor selects the current signal sent by the flow indicator controller to control the flow regulating valve; preferably, in the oxygen analyzer unit, the oxygen analyzer group detects and analyzes the oxygen content in the buffer tank, and converts it into three current signals that are linearly related to its oxygen content to be sent to the median selector, and then the median selector selects the current signal that represents the median of its oxygen content to be sent to the selection processor as the flow signal of the oxygen analyzer unit.

[0029] The beneficial effects of this invention are as follows:

[0030] (1) The system and method for safe decomposition of hydrogen peroxide of the present invention, by setting a buffer tank between the oxidation reaction system and the downstream separation system, can ensure that the hydrogen peroxide that is not completely converted in the reaction liquid from the oxidation reaction system is completely converted into oxidized and discharged in the buffer tank, so that when the deoxygenated reaction liquid is sent to the downstream separation system, even if there is flammable gas in the downstream separation system, it will not explode, thus improving the safety of operation.

[0031] (2) The system and method for safe decomposition of hydrogen peroxide of the present invention supplements nitrogen through the flow control loop of the buffer tank to the downstream oxygen-containing waste gas and the first pressure control loop of the buffer tank, so as to ensure that the oxygen-containing phase generated by the decomposition of unreacted hydrogen peroxide in the buffer tank is continuously sent to the downstream gas treatment system after being diluted by nitrogen; if the oxygen content increases under abnormal operating conditions, the flow rate of oxygen-containing tail gas to the downstream gas treatment system is increased through the oxygen analyzer unit, and the nitrogen replenishment rate is increased accordingly to improve the oxygen dilution rate in the system.

[0032] (3) The system and method for safe decomposition of hydrogen peroxide of the present invention improves the reliability of nitrogen source and nitrogen replenishment by setting a bypass for the second pressure control circuit (i.e., in the second pressure control circuit, a pressure reducing valve is set in parallel with the second pressure regulating valve).

[0033] (4) The system and method for safe decomposition of hydrogen peroxide of the present invention, by setting a flow bypass in the flow control loop for the transport of oxygen-containing waste gas from the buffer tank to the downstream (i.e., in the flow control loop, a second flow limiting orifice plate is set in parallel with the flow regulating valve), and setting a bypass in the first pressure control loop for nitrogen replenishment of the buffer tank (i.e., in the first pressure control loop, a first flow limiting orifice plate is set in parallel with the first pressure regulating valve), avoids the risk of the first pressure regulating valve, the second pressure regulating valve and the flow regulating valve failing to transport oxygen-containing waste gas from the buffer tank, or the system failing to replenish nitrogen, thereby leading to the risk of system pressure buildup or increased oxygen content. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the system for the safe decomposition of hydrogen peroxide according to one embodiment of the present invention. Detailed Implementation

[0035] The technical solution and its effects of the present invention will be further described below with reference to specific embodiments / examples and accompanying drawings. The following embodiments / examples are only for illustrating the content of the present invention, and the invention is not limited to the following embodiments or examples. Simple modifications made to the present invention based on the concept of the present invention are all within the scope of protection claimed by the present invention.

[0036] This invention provides a system for the safe decomposition of hydrogen peroxide, such as... Figure 1 As shown, the system includes a buffer tank 1, which has an inlet, an outlet, and a gas outlet. The inlet is connected to the reaction liquid outlet of the oxidation reaction system using hydrogen peroxide as an oxidant, and the outlet is connected to a downstream separation system. The system receives the reaction liquid containing hydrogen peroxide from the oxidation reaction system, decomposes the hydrogen peroxide, discharges oxygen-containing tail gas, and outputs the deoxygenated reaction liquid to the downstream separation system.

[0037] The present invention relates to a system for the safe decomposition of hydrogen peroxide. By setting a buffer tank between the oxidation reaction system and the downstream separation system, it can ensure that the incompletely converted hydrogen peroxide from the reaction liquid in the oxidation reaction system is completely converted into oxidized hydrogen peroxide in the buffer tank and discharged. This ensures that the deoxygenated reaction liquid will not explode when it is sent to the downstream separation system, even if there is flammable gas in the downstream separation system, thus improving operational safety.

[0038] In one implementation, such as Figure 1 As shown, the buffer tank 1 also includes an air inlet, which is connected to a nitrogen replenishment unit for replenishing nitrogen from the nitrogen replenishment unit to dilute the oxygen produced by decomposition inside, thereby preventing the oxygen concentration inside the buffer tank 1 from being too high and causing danger when sending the oxygen-containing exhaust gas to the downstream gas treatment system.

[0039] In one implementation, such as Figure 1 As shown, the nitrogen replenishment unit includes a nitrogen replenishment pipeline 201, which is connected to the air inlet of the buffer tank 1 for replenishing nitrogen therein.

[0040] In a preferred embodiment, a first pressure regulating valve 202 is provided on the nitrogen replenishment pipeline 201 to form a first pressure control loop for controlling the flow rate of nitrogen replenished into the buffer tank 1.

[0041] The present invention provides a system for the safe decomposition of hydrogen peroxide. By supplementing nitrogen through the first pressure control loop of the buffer tank 1, the system ensures that the oxygen-containing phase generated by the decomposition of unreacted hydrogen peroxide in the buffer tank is continuously sent to the downstream gas treatment system after being diluted with nitrogen.

[0042] In a preferred embodiment, such as Figure 1 As shown, a first flow-limiting orifice plate 203 is provided on the first pressure control circuit, and the first flow-limiting orifice plate 203 is connected in parallel with the first pressure regulating valve 202.

[0043] The present invention relates to a system for the safe decomposition of hydrogen peroxide. By setting a bypass in the first pressure control loop for nitrogen replenishment in the buffer tank (i.e., in the first pressure control loop, a first pressure regulating valve is connected in parallel with a first flow limiting orifice plate), the system avoids the risk of nitrogen replenishment failure due to the first pressure regulating valve, which could lead to an increase in the oxygen content of the system.

[0044] In one implementation, such as Figure 1As shown, a first pressure indicator controller 208 is also provided on the top of the buffer tank 1, and it is electrically connected to the first pressure regulating valve 202. The first pressure indicator controller 208 is used to measure the pressure in the buffer tank 1 and convert it into a current signal that is linearly related to the pressure measurement value and send it to the first pressure regulating valve 202 to control its opening, thereby controlling the flow rate of nitrogen to be supplied to the buffer tank 1.

[0045] In one implementation, such as Figure 1 As shown, the nitrogen replenishment unit also includes a pipeline nitrogen line 204, which is connected to the nitrogen replenishment line 201 and is used to replenish nitrogen through the pipeline.

[0046] In one implementation, such as Figure 1 As shown, the nitrogen replenishment unit also includes a nitrogen storage tank 205 and a nitrogen pipeline 206. The two ends of the nitrogen pipeline 206 are connected to the nitrogen storage tank 205 and the nitrogen replenishment pipeline 201, respectively, for replenishing nitrogen through the nitrogen storage tank 205. This allows the nitrogen storage tank to be activated to supply nitrogen when the nitrogen supply from the pipeline is insufficient or interrupted, thus preventing insufficient or interrupted nitrogen replenishment from failing to dilute the oxygen in the buffer tank 1 in time, which could lead to a high oxygen content in the buffer tank 1 and cause a hazard.

[0047] In one implementation, such as Figure 1 As shown, a second pressure regulating valve 207 is installed on the nitrogen pipeline 206 of the storage tank to form a second pressure control loop, which is used to control the nitrogen output flow rate of the nitrogen storage tank 205.

[0048] In one implementation, such as Figure 1 As shown, a second pressure indicator controller 209 is also provided on the nitrogen pipeline 206 of the storage tank. It is located downstream of the second pressure regulating valve 207 along the gas flow direction and is electrically connected to the second pressure regulating valve 207. The second pressure indicator controller 209 measures the pressure in the nitrogen pipeline 206 of the storage tank and converts it into a current signal that is linearly related to the pressure measurement value. The current signal is then sent to the second pressure regulating valve 207 to control its opening, thereby controlling the nitrogen output flow rate of the nitrogen storage tank.

[0049] In one implementation, such as Figure 1 As shown, a pressure reducing valve 210 is also provided on the second pressure control circuit. One end of the pressure reducing valve 210 is located at the inlet end of the second pressure regulating valve 207, and the other end is located downstream of the second pressure indicating controller 209 along the gas flow direction, for reducing pressure and diverting the nitrogen pipeline 206 of the storage tank.

[0050] The present invention provides a system for the safe decomposition of hydrogen peroxide. By setting a bypass in the second pressure control loop (i.e., in the second pressure control loop, a pressure reducing valve is set in parallel with the second pressure regulating valve), the system avoids the inability to replenish nitrogen due to a failure in the second pressure control loop, thereby improving the reliability of the nitrogen source and the replenishment of nitrogen.

[0051] In one implementation, such as Figure 1 As shown, the system also includes an oxygen-containing exhaust gas pipeline 301, with its two ends connected to the buffer tank 1 and the downstream gas treatment system, respectively, for outputting the oxygen-containing exhaust gas from the buffer tank 1 to the downstream gas treatment system.

[0052] In one implementation, such as Figure 1 As shown, a flow regulating valve 302 is installed on the oxygen-containing exhaust gas pipeline 301 to form a flow control loop, which is used to control the flow rate of the oxygen-containing exhaust gas output from the buffer tank 1, so as to output the oxygen-containing exhaust gas in time and avoid system pressure buildup.

[0053] In one implementation, such as Figure 1 As shown, a second flow limiting orifice plate 303 is provided on the flow control loop, and the second flow limiting orifice plate 303 is arranged in parallel with the flow regulating valve 302.

[0054] The present invention relates to a system for the safe decomposition of hydrogen peroxide. By setting a flow bypass in the flow control loop for the transport of oxygen-containing waste gas from the buffer tank to the downstream (i.e., in the flow control loop, a second flow limiting orifice plate is set in parallel with the flow regulating valve), the system avoids the risk of system pressure buildup caused by the failure of the flow regulating valve to transport oxygen-containing waste gas from the buffer tank.

[0055] In one implementation, such as Figure 1 As shown, a flow indicator controller 304 is also provided on the oxygen-containing exhaust gas pipeline 301. It is located upstream of the flow regulating valve 302 along the gas flow direction and is electrically connected to the flow regulating valve 302. The flow indicator controller 304 measures the flow rate of the oxygen-containing exhaust gas in the oxygen-containing exhaust gas pipeline 301 and converts it into a current signal that is linearly related to the flow rate of the oxygen-containing exhaust gas. This signal is then sent to the flow regulating valve 302 to control its opening, thereby further controlling the flow rate of the oxygen-containing exhaust gas output from the buffer tank 1.

[0056] In one implementation, such as Figure 1 As shown, the system also includes an oxygen analyzer unit 305 and a selection processor 306;

[0057] The signal receiving end of the selection processor 306 is electrically connected to the flow indicator controller 304, and the signal transmitting end of the selection processor 306 is electrically connected to the flow regulating valve 302. The flow indicator controller 304 is electrically connected to the flow regulating valve 302 through the selection processor 306. The signal receiving end of the oxygen analyzer unit 305 is connected to the top of the buffer tank 1, and the signal transmitting end of the oxygen analyzer unit 305 is connected to the signal receiving end of the selection processor 306. This allows the oxygen analyzer unit 305 to detect and analyze the oxygen content of the oxygen-containing exhaust gas in the buffer tank 1, converting it into a current signal linearly related to its oxygen content. Then, the selection processor 306 is used to... The selection processor 306 receives current signals from the oxygen analyzer unit 305 and the flow indicator controller 304, selects one of them according to the maximum allowable oxygen content, and sends the selected current signal to the flow regulating valve 302 to control its opening. Specifically, when the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is greater than the maximum allowable oxygen content, the selection processor 306 selects the current signal sent by the oxygen analyzer unit 305 to control the flow regulating valve 302; when the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is less than or equal to the maximum allowable oxygen content, the selection processor 306 selects the current signal sent by the flow indicator controller 304 to control the flow regulating valve 302.

[0058] Those skilled in the art will understand that in this invention, oxygen content refers to the concentration of oxygen in the gas; maximum permissible oxygen content refers to the maximum permissible oxygen concentration in the system, exceeding which will result in dangers such as explosion.

[0059] This invention uses a selection processor 306 to select current signals from the oxygen analyzer unit 305 and the flow indicator controller 304. When the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is greater than the maximum allowable oxygen content, the selection processor 306 selects the current signal sent by the oxygen analyzer unit 305 to control the flow regulating valve 302. When the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is less than or equal to the maximum allowable oxygen content, the selection processor 306 selects the current signal sent by the flow indicator controller 304 to control the flow regulating valve 302. Therefore, when the oxygen content increases under abnormal operating conditions, the oxygen analyzer unit 305 increases the flow rate of oxygenated exhaust gas to the downstream gas treatment system, increasing the oxygen dilution rate in the system and reducing the oxygen content. Simultaneously, the nitrogen replenishment rate can also be increased accordingly to increase the oxygen dilution rate in the system and reduce the oxygen content.

[0060] In one implementation, such as Figure 1As shown, the oxygen analyzer unit 305 is equipped with an oxygen analyzer group and a median selector connected in series. The oxygen analyzer group includes three oxygen analyzers connected in parallel. The oxygen analyzer group is used to detect and analyze the oxygen content in the buffer tank 1 and convert it into three current signals that are linearly related to the oxygen content. These signals are then sent to the median selector. The median selector selects the current signal that represents the median oxygen content and sends it to the selection processor 306, thereby avoiding data errors caused by the malfunction of one of the oxygen analyzers.

[0061] This invention also provides a method for the safe decomposition of hydrogen peroxide, the method comprising using the aforementioned system to safely decompose hydrogen peroxide; such as Figure 1 As shown, it specifically includes:

[0062] The reaction solution containing hydrogen peroxide is passed into the buffer tank 1 for safe decomposition of hydrogen peroxide and output of oxygen-containing tail gas. The deoxygenated reaction solution is then sent to the downstream separation system for further processing.

[0063] The present invention provides a method for the safe decomposition of hydrogen peroxide. By setting up a buffer tank between the oxidation reaction system and the downstream separation system, it is possible to ensure that the incompletely converted hydrogen peroxide from the reaction liquid in the oxidation reaction system is completely converted into oxidized hydrogen peroxide and discharged in the buffer tank. This ensures that the deoxygenated reaction liquid will not explode when it is sent to the downstream separation system, even if there is flammable gas in the downstream separation system, thus improving operational safety.

[0064] In one implementation, such as Figure 1 As shown, the decomposition within the buffer tank 1 includes the following steps:

[0065] (1) While the reaction liquid containing hydrogen peroxide is introduced into the buffer tank 1 for safe decomposition of hydrogen peroxide, nitrogen is added to the buffer tank 1 through the nitrogen replenishment pipeline 201 to dilute the oxygen produced by decomposition, thereby reducing the oxygen content of the gas in the buffer tank 1.

[0066] (2) While the buffer tank 1 outputs oxygen-containing tail gas, the flow rate of the oxygen-containing tail gas output from the buffer tank 1 is controlled by the flow regulating valve 302, thereby reducing the oxygen content of the gas in the buffer tank 1.

[0067] In one implementation, such as Figure 1As shown, in step (1), the flow rate of nitrogen gas supplied to the buffer tank 1 is adjusted by the first pressure regulating valve 202; preferably, when the first pressure regulating valve 202 fails, nitrogen gas is supplied to the buffer tank 1 by the first flow limiting orifice plate 203; preferably, the first pressure indicating controller 208 is used to measure the pressure in the buffer tank 1 and convert it into a current signal that is linearly related to its pressure measurement value and sent to the first pressure regulating valve 202 to control its opening.

[0068] In one implementation, such as Figure 1 As shown, in step (1), nitrogen is introduced into the nitrogen replenishment pipeline 201 through the nitrogen pipeline 204 in order to replenish nitrogen into the buffer tank 1 through the pipeline.

[0069] In one implementation, such as Figure 1 As shown, in step (1), nitrogen is introduced into the nitrogen replenishment pipeline 201 through the nitrogen storage tank 205 and the nitrogen pipeline 206, which is used to replenish nitrogen into the buffer tank 1 through the nitrogen storage tank 205. This allows the nitrogen storage tank to be activated to supply nitrogen when the nitrogen supply in the pipeline is insufficient or interrupted, thus avoiding insufficient or interrupted nitrogen supply and failure to dilute the oxygen in the buffer tank 1 in time, which could lead to a high oxygen content in the buffer tank 1 and cause danger. Preferably, the nitrogen output flow rate of the nitrogen storage tank 205 is controlled by the second pressure regulating valve 207. Preferably, the pressure in the nitrogen pipeline 206 is measured by the second pressure indicator controller 209 and converted into a current signal that is linearly related to the pressure measurement value and sent to the second pressure regulating valve 207 to control its opening. Preferably, the pressure reducing valve 210 is used to reduce the pressure and divert the nitrogen pipeline 206.

[0070] The system and method for the safe decomposition of hydrogen peroxide of the present invention have two main sources of nitrogen for the buffer tank. Under normal operating conditions, nitrogen from the nitrogen pipeline network is used as the source of nitrogen replenishment for the buffer tank. The pressure reducing valve at the outlet of the nitrogen storage tank and the second pressure control circuit do not activate, and the nitrogen from the nitrogen pipeline network is used as the nitrogen source for the buffer tank. If the nitrogen supply from the nitrogen pipeline network is interrupted, the nitrogen storage tank replenishes nitrogen to the buffer tank through the regulating action of the second pressure control circuit at its outlet. At the same time, the second pressure control circuit is equipped with a pressure reducing valve to avoid the risk of nitrogen interruption in the buffer tank caused by the failure of the second pressure control circuit. The nitrogen storage tank has a nitrogen capacity sufficient for at least half an hour of nitrogen use according to the user's needs to avoid the risk of excessive oxygen content caused by nitrogen interruption in the buffer tank.

[0071] In one implementation, such as Figure 1As shown, in step (2), when the flow regulating valve 302 fails, oxygen-containing tail gas is output from the buffer tank 1 through the second flow limiting orifice plate 303; preferably, the flow indicator controller 304 is used to measure the flow rate of oxygen-containing tail gas in the oxygen-containing tail gas pipeline 301, and converts it into a current signal that is linearly related to the flow rate of oxygen-containing tail gas and sends it to the flow regulating valve 302 to control its opening.

[0072] The system and method for the safe decomposition of hydrogen peroxide of the present invention continuously deliver oxygen-containing exhaust gas from a buffer tank to a downstream gas treatment system through a flow control loop. As the pressure decreases, nitrogen is added to the buffer tank using a first pressure control loop to ensure that the oxygen-containing exhaust gas in the buffer tank is continuously delivered to the downstream gas treatment system. At the same time, nitrogen is continuously added to maintain the system pressure while ensuring that the oxygen-containing exhaust gas is diluted to a safe concentration.

[0073] In one implementation, such as Figure 1 As shown, in step (2), the oxygen analyzer unit 305 detects and analyzes the oxygen content in the buffer tank 1 and converts it into a current signal that is linearly related to the oxygen content. Then, the selection processor 306 receives the current signals from the oxygen analyzer unit 305 and the flow indicator controller 304 respectively, selects one of them according to the maximum allowable oxygen content, and sends the selected current signal to the flow regulating valve 302 to control and adjust its opening. When the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is greater than the maximum allowable oxygen content, the selection processor 306 selects the current signal sent by the oxygen analyzer unit 305 to control the flow regulating valve 302. Thus, when the oxygen content increases under abnormal operating conditions, the oxygen analyzer unit 305 adjusts the opening of the flow regulating valve 302 to increase the flow rate of the oxygen-containing tail gas to the downstream gas treatment system, increase the oxygen dilution rate in the system, and reduce the oxygen content. Simultaneously, the nitrogen replenishment rate can be increased accordingly to improve the oxygen dilution rate in the system and reduce the oxygen content to a safe range; when the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is ≤ the maximum allowable oxygen content of the system, the selection processor 306 selects the current signal sent by the flow indicator controller 304 to control the flow regulating valve 302.

[0074] The present invention relates to a system and method for the safe decomposition of hydrogen peroxide. If, under abnormal operating conditions, the oxygen content in buffer tank 1 increases, the oxygen content of the oxygen-containing waste gas output from buffer tank 1 to the downstream gas treatment system can be detected by the oxygen analyzer unit 305. This oxygen content is then converted into a current signal linearly related to the oxygen content and sent to the selector processor 306. The selector processor 306 then sends the signal to the flow regulating valve 302 to control its opening. This is equivalent to controlling the flow regulating valve 302 through the oxygen analyzer unit 305, thereby increasing the output flow rate of the oxygen-containing exhaust gas from the buffer tank 1. Similarly, the system can also increase the nitrogen replenishment through pressure control, maintaining the system's pressure balance while rapidly diluting the oxygen in the system to a safe range.

[0075] In one embodiment, in step (2), the oxygen analyzer unit 305 uses the oxygen analyzer group to detect and analyze the oxygen content in the buffer tank 1, and converts it into three current signals that are linearly related to the oxygen content to be sent to the median selector. Then, the median selector selects the current signal that represents the median of the oxygen content to be sent to the selection processor 306, thereby avoiding data errors caused by the abnormality of one of the oxygen analyzers.

[0076] The present invention relates to a system and method for the safe decomposition of hydrogen peroxide. By setting a buffer tank between the oxidation reaction system and the downstream separation system, it can ensure that the incompletely converted hydrogen peroxide from the reaction liquid of the oxidation reaction system is completely converted into oxidized hydrogen peroxide in the buffer tank and discharged. Thus, when the deoxygenated reaction liquid is sent to the downstream separation system, even if there is flammable gas in the downstream separation system, an explosion will not occur, thereby improving operational safety.

[0077] like Figure 1 As shown, the system and method for the safe decomposition of hydrogen peroxide of the present invention, the process of safely decomposing hydrogen peroxide is as follows:

[0078] (1) While the hydrogen peroxide-containing reaction solution (e.g., from an oxidation reaction system producing propylene oxide) is introduced into the buffer tank 1 for safe decomposition of the hydrogen peroxide, nitrogen is simultaneously supplied to the buffer tank 1 through the nitrogen supply line 201 to dilute the oxygen produced during decomposition; during this period...

[0079] The flow rate of nitrogen gas supplied to the buffer tank 1 is adjusted by the first pressure regulating valve 202; the pressure in the buffer tank 1 is measured by the first pressure indicator controller 208 and converted into a current signal that is linearly related to the pressure measurement value and sent to the first pressure regulating valve 202 to control its opening; when the first pressure regulating valve 202 fails, nitrogen gas is supplied to the buffer tank 1 through the first flow limiting orifice plate 203.

[0080] When the nitrogen pipeline 204 is opened, nitrogen is introduced into the nitrogen replenishment pipeline 201 through the nitrogen pipeline 204 to replenish nitrogen into the buffer tank 1 through the pipeline network.

[0081] When the nitrogen pipeline 204 is interrupted, nitrogen is introduced into the nitrogen replenishment pipeline 201 through the nitrogen storage tank 205 and the nitrogen pipeline 206, so as to replenish the buffer tank 1 with nitrogen through the nitrogen storage tank 205; and the nitrogen output flow rate of the nitrogen storage tank 205 is controlled by the second pressure regulating valve 207; the pressure in the nitrogen pipeline 206 is measured by the second pressure indicator controller 209 and converted into a current signal that is linearly related to the pressure measurement value and sent to the second pressure regulating valve 207 to control its opening; when the nitrogen output flow rate of the nitrogen storage tank 205 is large, the pressure reducing valve 210 is used to reduce the pressure and divert the nitrogen pipeline 206.

[0082] (2) While the buffer tank 1 outputs oxygen-containing tail gas, the flow rate of the oxygen-containing tail gas output from the buffer tank 1 is controlled by the flow regulating valve 302; during this period,

[0083] The flow indicator controller 304 measures the flow rate of the oxygen-containing exhaust gas in the oxygen-containing exhaust gas pipeline 301 and converts it into a current signal that is linearly related to the flow rate of the oxygen-containing exhaust gas. This signal is then sent to the flow regulating valve 302 to control its opening. In the event of a failure of the flow regulating valve 302, the oxygen-containing exhaust gas is output from the buffer tank 1 through the second flow limiting orifice plate 303.

[0084] The oxygen analyzer unit 305 detects and analyzes the oxygen content in the buffer tank 1 and converts it into a current signal linearly related to the oxygen content. Then, the selection processor 306 receives current signals from both the oxygen analyzer unit 305 and the flow indicator controller 304, selects one based on the maximum allowable oxygen content, and sends the selected current signal to the flow regulating valve 302 to control its opening. Specifically, when the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is greater than the maximum allowable oxygen content, the selection processor 306 selects the current signal sent by the oxygen analyzer unit 305 to control the flow regulating valve 302; when the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is less than or equal to the system's maximum allowable oxygen content, the selection processor 306 selects the current signal sent by the flow indicator controller 304 to control the flow regulating valve 302.

[0085] Furthermore, in the oxygen analyzer unit 305, the oxygen analyzer group detects and analyzes the oxygen content in the buffer tank 1, and converts it into three current signals that are linearly related to the oxygen content, which are then sent to the median selector. The median selector then selects the current signal that represents the median oxygen content and sends it to the selection processor 306 as the flow signal of the oxygen analyzer unit 305.

[0086] The present application will be further illustrated below through specific embodiments and comparative examples.

[0087] Example 1 (S1)

[0088] A method for the safe decomposition of hydrogen peroxide, utilizing, for example Figure 1 The system shown is operated, and the method includes:

[0089] (1) While the hydrogen peroxide-containing reaction solution (e.g., from an oxidation reaction system producing propylene oxide) is introduced into the buffer tank 1 for safe decomposition of the hydrogen peroxide, nitrogen is simultaneously supplied to the buffer tank 1 through the nitrogen supply line 201 to dilute the oxygen produced during decomposition; during this period...

[0090] The flow rate of nitrogen gas supplied to the buffer tank 1 is adjusted by the first pressure regulating valve 202; the pressure in the buffer tank 1 is measured by the first pressure indicator controller 208 and converted into a current signal that is linearly related to the pressure measurement value and sent to the first pressure regulating valve 202 to control its opening; when the first pressure regulating valve 202 fails, nitrogen gas is supplied to the buffer tank 1 through the first flow limiting orifice plate 203.

[0091] When the nitrogen pipeline 204 is opened, nitrogen is introduced into the nitrogen replenishment pipeline 201 through the nitrogen pipeline 204 to replenish nitrogen into the buffer tank 1 through the pipeline network.

[0092] When the nitrogen pipeline 204 is interrupted, nitrogen is introduced into the nitrogen replenishment pipeline 201 through the nitrogen storage tank 205 and the nitrogen pipeline 206, so as to replenish the buffer tank 1 with nitrogen through the nitrogen storage tank 205; and the nitrogen output flow rate of the nitrogen storage tank 205 is controlled by the second pressure regulating valve 207; the pressure in the nitrogen pipeline 206 is measured by the second pressure indicator controller 209 and converted into a current signal that is linearly related to the pressure measurement value and sent to the second pressure regulating valve 207 to control its opening; when the nitrogen output flow rate of the nitrogen storage tank 205 is large, the pressure reducing valve 210 is used to reduce the pressure and divert the nitrogen pipeline 206.

[0093] (2) While the buffer tank 1 outputs oxygen-containing tail gas, the flow rate of the oxygen-containing tail gas output from the buffer tank 1 is controlled by the flow regulating valve 302; during this period,

[0094] The flow indicator controller 304 measures the flow rate of the oxygen-containing exhaust gas in the oxygen-containing exhaust gas pipeline 301 and converts it into a current signal that is linearly related to the flow rate of the oxygen-containing exhaust gas. This signal is then sent to the flow regulating valve 302 to control its opening. In the event of a failure of the flow regulating valve 302, the oxygen-containing exhaust gas is output from the buffer tank 1 through the second flow limiting orifice plate 303.

[0095] The oxygen analyzer unit 305 detects and analyzes the oxygen content in the buffer tank 1 and converts it into a current signal linearly related to the oxygen content. Then, the selection processor 306 receives current signals from both the oxygen analyzer unit 305 and the flow indicator controller 304, selects one based on the maximum allowable oxygen content, and sends the selected current signal to the flow regulating valve 302 to control its opening. Specifically, when the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is greater than the maximum allowable oxygen content, the selection processor 306 selects the current signal sent by the oxygen analyzer unit 305 to control the flow regulating valve 302; when the oxygen content represented by the current signal sent by the oxygen analyzer unit 305 is less than or equal to the system's maximum allowable oxygen content, the selection processor 306 selects the current signal sent by the flow indicator controller 304 to control the flow regulating valve 302.

[0096] Furthermore, in the oxygen analyzer unit 305, the oxygen analyzer group detects and analyzes the oxygen content in the buffer tank 1, and converts it into three current signals that are linearly related to the oxygen content, which are then sent to the median selector. The median selector then selects the current signal that represents the median oxygen content and sends it to the selection processor 306 as the flow signal of the oxygen analyzer unit 305.

[0097] result:

[0098] The oxygen content of the oxygen-containing gas in the system (i.e., the oxygen-containing gas in buffer tank 1) is maintained within a safe range; no explosion or other danger occurs during the process of sending the oxygen-containing tail gas output from buffer tank 1 to the downstream gas treatment system.

[0099] The hydrogen peroxide content in the deoxygenated reaction liquid output from buffer tank 1 meets the process requirements and is maintained within a safe range; no explosion or other dangers occurred during the process of sending the deoxygenated reaction liquid output from buffer tank 1 to the downstream separation system.

[0100] As can be seen from Example 1 (S1), the system and method for safe decomposition of hydrogen peroxide of the present invention, by setting a buffer tank between the oxidation reaction system and the downstream separation system, can ensure that the hydrogen peroxide that is not completely converted in the reaction liquid from the oxidation reaction system is completely converted into oxidized hydrogen peroxide in the buffer tank and discharged. Thus, when the deoxygenated reaction liquid is sent to the downstream separation system, even if there is flammable gas in the downstream separation system, an explosion will not occur, thereby improving operational safety.

Claims

1. A system for the safe decomposition of hydrogen peroxide, characterized in that, The system includes a buffer tank (1), which includes an inlet, an outlet and a gas outlet. The inlet is connected to the reaction liquid outlet of the oxidation reaction system using hydrogen peroxide as an oxidant, and the outlet is connected to a downstream separation system. The system is used to receive the reaction liquid containing hydrogen peroxide from the oxidation reaction system, decompose the hydrogen peroxide therein, discharge oxygen-containing tail gas, and output the deoxygenated reaction liquid to the downstream separation system. The buffer tank (1) also includes an air inlet, which is connected to a nitrogen replenishment unit for replenishing nitrogen from the nitrogen replenishment unit to dilute the oxygen produced by decomposition inside. The system also includes an oxygen-containing exhaust gas pipeline (301), with its two ends connected to the buffer tank (1) and the downstream gas processing system, respectively, for outputting the oxygen-containing exhaust gas from the buffer tank (1) to the downstream gas processing system. The oxygen-containing exhaust gas pipeline (301) is equipped with a flow regulating valve (302) and a flow indicator controller (304). The system also includes an oxygen analyzer unit (305) and a selection processor (306). The signal receiving end of the selection processor (306) is electrically connected to the flow indicator controller (304), and the signal transmitting end of the selection processor (306) is electrically connected to the flow regulating valve (302).

2. The system according to claim 1, characterized in that, The nitrogen replenishment unit includes a nitrogen replenishment pipeline (201), which is connected to the inlet of the buffer tank (1) for replenishing nitrogen therein.

3. The system according to claim 2, characterized in that, A first pressure regulating valve (202) is provided on the nitrogen replenishment pipeline (201) to form a first pressure control loop for controlling the flow rate of nitrogen replenished into the buffer tank (1).

4. The system according to claim 3, characterized in that, The first pressure control circuit is provided with a first flow limiting orifice plate (203), which is connected in parallel with the first pressure regulating valve (202).

5. The system according to claim 3, characterized in that, The top of the buffer tank (1) is also provided with a first pressure indicator controller (208), which is electrically connected to the first pressure regulating valve (202) for measuring the pressure inside the buffer tank (1) using the first pressure indicator controller (208) and converting it into a current signal that is linearly related to its pressure measurement value and sending it to the first pressure regulating valve (202) to control its opening.

6. The system according to any one of claims 2-5, characterized in that, The nitrogen replenishment unit also includes a pipeline nitrogen line (204), which is connected to the nitrogen replenishment line (201) and is used to replenish nitrogen through the pipeline.

7. The system according to claim 6, characterized in that, The nitrogen replenishment unit also includes a nitrogen storage tank (205) and a nitrogen pipeline (206). The two ends of the nitrogen pipeline (206) are connected to the nitrogen storage tank (205) and the nitrogen replenishment pipeline (201) respectively, and are used to replenish nitrogen through the nitrogen storage tank (205).

8. The system according to claim 7, characterized in that, A second pressure regulating valve (207) is installed on the nitrogen pipeline (206) of the storage tank to form a second pressure control loop, which is used to control the nitrogen output flow of the nitrogen storage tank (205).

9. The system according to claim 8, characterized in that, A second pressure indicator controller (209) is also provided on the nitrogen pipeline (206) of the storage tank, and it is located downstream of the second pressure regulating valve (207) along the gas flow direction. It is electrically connected to the second pressure regulating valve (207) and is used to measure the pressure in the nitrogen pipeline (206) of the storage tank by means of the second pressure indicator controller (209), and convert it into a current signal that is linearly related to its pressure measurement value and send it to the second pressure regulating valve (207) to control its opening.

10. The system according to claim 9, characterized in that, The second pressure control circuit is also provided with a pressure reducing valve (210). One end of the pressure reducing valve (210) is located at the inlet end of the second pressure regulating valve (207), and the other end is located downstream of the second pressure indicating controller (209) along the gas flow direction, for pressure reducing and diverting the nitrogen pipeline (206) of the storage tank.

11. The system according to any one of claims 1-5 and 7-10, characterized in that, The flow regulating valve (302) is installed on the oxygen-containing tail gas pipeline (301) to form a flow control loop for controlling the flow rate of the oxygen-containing tail gas output from the buffer tank (1).

12. The system according to claim 11, characterized in that, The flow control loop is provided with a second flow limiting orifice plate (303), which is connected in parallel with the flow regulating valve (302).

13. The system according to claim 11, characterized in that, The flow indicator controller (304) is installed on the oxygen-containing exhaust gas pipeline (301), and it is located upstream of the flow regulating valve (302) along the gas flow direction. It is electrically connected to the flow regulating valve (302) and is used to measure the flow rate of the oxygen-containing exhaust gas in the oxygen-containing exhaust gas pipeline (301) by means of the flow indicator controller (304), and convert it into a current signal that is linearly related to the flow rate of the oxygen-containing exhaust gas and send it to the flow regulating valve (302) to control its opening degree.

14. The system according to any one of claims 1-5, 7-10 and 12-13, characterized in that, The flow indicator controller (304) is electrically connected to the flow regulating valve (302) via the selection processor (306), and the signal receiving end of the oxygen analyzer unit (305) is connected to the top of the buffer tank (1). The signal transmitting end of the oxygen analyzer unit (305) is connected to the signal receiving end of the selection processor (306), which is used to detect and analyze the oxygen content of the oxygen-containing exhaust gas in the buffer tank (1) using the oxygen analyzer unit (305), and convert it into a current signal that is linearly related to its oxygen content. Then, the selection processor (306) receives the signals from the oxygen analyzer unit (305) and the flow indicator controller (304). The selection processor (306) selects one of the current signals according to the maximum allowable oxygen content and sends the selected current signal to the flow regulating valve (302) to control its opening degree; wherein, when the oxygen content represented by the current signal sent by the oxygen analyzer unit (305) is greater than the maximum allowable oxygen content, the selection processor (306) selects the current signal sent by the oxygen analyzer unit (305) to control the flow regulating valve (302); when the oxygen content represented by the current signal sent by the oxygen analyzer unit (305) is less than or equal to the maximum allowable oxygen content, the selection processor (306) selects the current signal sent by the flow indicator controller (304) to control the flow regulating valve (302).

15. The system according to claim 14, characterized in that, The oxygen analyzer unit (305) is connected in series with an oxygen analyzer group and a median selector. The oxygen analyzer group includes three oxygen analyzers connected in parallel. The oxygen analyzer group is used to detect and analyze the oxygen content in the buffer tank (1) and convert it into three current signals that are linearly related to the oxygen content to be sent to the median selector. Then, the median selector selects the current signal that represents the median of the oxygen content to be sent to the selection processor (306).

16. A method for the safe decomposition of hydrogen peroxide, characterized in that, The method utilizes the system described in any one of claims 1-15 to safely decompose hydrogen peroxide; specifically, it includes: The hydrogen peroxide-containing reaction solution is passed into the buffer tank (1) for safe decomposition of hydrogen peroxide and output of oxygen-containing tail gas. The deoxygenated reaction solution is then sent to the downstream separation system for further processing.

17. The method according to claim 16, characterized in that, The decomposition within the buffer tank (1) includes the following steps: (1) While the reaction liquid containing hydrogen peroxide is introduced into the buffer tank (1) for safe decomposition of hydrogen peroxide, nitrogen is added to the buffer tank (1) through the nitrogen replenishment pipeline (201) to dilute the oxygen produced by decomposition. (2) While the buffer tank (1) outputs oxygen-containing tail gas, the flow rate of the oxygen-containing tail gas output from the buffer tank (1) is controlled by the flow regulating valve (302).

18. The method according to claim 17, characterized in that, In step (1), the flow rate of nitrogen gas supplied to the buffer tank (1) is adjusted by the first pressure regulating valve (202).

19. The method according to claim 18, characterized in that, In step (1), when the first pressure regulating valve (202) fails, nitrogen is added to the buffer tank (1) through the first flow limiting orifice plate (203).

20. The method according to claim 19, characterized in that, In step (1), the pressure inside the buffer tank (1) is measured by the first pressure indicator controller (208) and converted into a current signal that is linearly related to the pressure measurement value and sent to the first pressure regulating valve (202) to control its opening.

21. The method according to any one of claims 17-20, characterized in that, In step (2), when the flow regulating valve (302) fails, oxygen-containing tail gas is output from the buffer tank (1) through the second flow limiting orifice plate (303).

22. The method according to claim 21, characterized in that, In step (2), the flow indicator controller (304) measures the flow rate of the oxygenated tail gas in the oxygenated tail gas pipeline (301) and converts it into a current signal that is linearly related to the flow rate of the oxygenated tail gas, which is then sent to the flow regulating valve (302) to control its opening.

23. The method according to any one of claims 17-20 and 22, characterized in that, In step (1), nitrogen is introduced into the nitrogen replenishment pipeline (201) via the nitrogen pipeline (204) to replenish nitrogen into the buffer tank (1) through the pipeline network; and / or, In step (1), nitrogen is introduced into the nitrogen replenishment pipeline (201) through the nitrogen storage tank (205) and the nitrogen pipeline (206) to replenish nitrogen into the buffer tank (1) through the nitrogen storage tank (205); and / or, In step (2), the oxygen analyzer unit (305) is used to detect and analyze the oxygen content in the buffer tank (1) and convert it into a current signal that is linearly related to the oxygen content. Then, the selection processor (306) receives the current signals from the oxygen analyzer unit (305) and the flow indicator controller (304) respectively, selects one of them according to the maximum allowable oxygen content, and sends the selected current signal to the flow regulating valve (302) to control and adjust its opening. When the oxygen content represented by the current signal sent by the oxygen analyzer unit (305) is greater than the maximum allowable oxygen content, the selection processor (306) selects the current signal sent by the oxygen analyzer unit (305) to control the flow regulating valve (302). When the oxygen content represented by the current signal sent by the oxygen analyzer unit (305) is less than or equal to the maximum allowable oxygen content of the system, the selection processor (306) selects the current signal sent by the flow indicator controller (304) to control the flow regulating valve (302).

24. The method according to claim 23, characterized in that, In step (1), the nitrogen output flow rate of the nitrogen storage tank (205) is controlled by the second pressure regulating valve (207).

25. The method according to claim 24, characterized in that, In step (1), the pressure in the nitrogen pipeline (206) of the storage tank is measured by the second pressure indicator controller (209), and converted into a current signal that is linearly related to the pressure measurement value and sent to the second pressure regulating valve (207) to control its opening.

26. The method according to claim 25, characterized in that, In step (1), the nitrogen pipeline (206) of the storage tank is depressurized and diverted using a pressure reducing valve (210).

27. The method according to any one of claims 24-26, characterized in that, In step (2), the oxygen analyzer unit (305) uses the oxygen analyzer group to detect and analyze the oxygen content in the buffer tank (1), and converts it into three current signals that are linearly related to the oxygen content to be sent to the median selector. Then, the median selector selects the current signal that represents the median of the oxygen content to be sent to the selection processor (306).

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