Treatment device for gas discharged by safety valve of etherification reaction kettle
The gas leaked from the etherification reactor safety valve is treated in series by connecting the absorption tower and the cooler, which solves the problem of direct emissions that harm health, and achieves safe and efficient gas treatment and low-cost operation.
Patent Information
- Application Number
- CN202422716630.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-11-07
AI Technical Summary
The gas leaked from the safety valve of the etherification reactor is directly discharged into the atmosphere, endangering human health and may cause safety accidents. The existing technology cannot effectively deal with these harmful gases.
The gas discharged from the safety valve of the etherification reactor is treated with at least two stages of absorption tower, and the gas discharged from the safety valve of the etherification reactor is sprayed to make the gas contact with the absorbent in the countercurrent, and a cooler is set up in the first stage of absorption tower to cool down, and finally the emission standards are met through the activated carbon adsorption device.
It realizes efficient and harmless treatment of gas discharged from the etherification reactor safety valve, ensures the safety of the reactor operation, and reduces environmental pollution and operating costs.
Smart Images
Figure CN223276096U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of separation using physical or chemical methods, in particular to a device for processing gas discharged from a safety valve of an etherification reactor. Background Art
[0002] When using the slurry process to produce methyl cellulose ether and its derivatives, the temperature of the etherification reactor can reach 90°C, and the pressure is normally below 0.8 MPa. The etherification reactor is generally equipped with a safety valve, which trips to relieve pressure when the internal pressure is too high. The gas released by the etherification reactor safety valve contains harmful gases such as toluene, isopropyl alcohol, methyl chloride, and propylene oxide. Because the exhaust port of the etherification reactor safety valve is directly exposed to the atmosphere, the direct discharge of these harmful gases into the atmosphere not only poses a threat to human health but may also cause other safety accidents. Utility Model Content
[0003] The utility model provides a gas treatment device for a safety valve of an etherification reactor, which aims to perform harmless treatment on the gas discharged from the safety valve of the etherification reactor and improve the safety of the etherification reactor during operation.
[0004] The technical solution adopted by the utility model is as follows: a gas treatment device for the discharge of a safety valve of an etherification reactor comprises at least two absorption towers, the absorption towers of each stage are arranged in series, an air inlet is provided at the bottom of each absorption tower and an exhaust port is provided at the top, the exhaust port of the previous absorption tower is connected to the air inlet of the next absorption tower through an air passage pipe, at least one of the air passage pipes is provided with a valve, the air inlet of the first absorption tower is connected to an air inlet pipe for being connected to the safety valve of the etherification reactor, the exhaust port of the last absorption tower is connected to an external discharge pipe, and the external discharge pipe is provided with an adsorption device; a waste discharge pipe is provided at the bottom of each absorption tower, a valve is provided on the waste discharge pipe, an absorbent circulation outlet and an absorbent circulation inlet are respectively provided at the bottom and top of each absorption tower, and one end of the absorbent circulation outlet located inside the absorption tower is also connected to a spraying device, the absorbent circulation inlets and outlets of each absorption tower are respectively connected through an absorbent circulation pipe, and a circulation pump and at least one valve are provided on the absorbent circulation pipe, and a cooler is also provided on the absorbent circulation pipe of the first absorption tower.
[0005] The gas discharged from the safety valve of the etherification reactor is relatively hot. The cooler is used to cool the absorbent in the first-stage absorber, thereby cooling the discharged gas within the first-stage absorber. To improve the cooler's cooling efficiency on the absorbent, the cooler is further positioned on the absorbent circulation pipeline between the liquid outlet of the circulation pump of the first-stage absorber and the absorbent circulation inlet, and the cooler is arranged near the absorbent circulation inlet.
[0006] The cooler should be suitable for cooling liquids. For example, the cooler may be a water-cooled cooler equipped with a cooling water supply pipe and a cooling water supply pipe. The absorbent circulation pipe between the cooler and the absorbent circulation inlet is provided with an insulation layer. The water-cooled cooler, the cooling water supply pipe, and the cooling water supply pipe are also provided with insulation layers.
[0007] In order to facilitate monitoring of the cooling condition of the absorbent by the cooler, a thermometer is further provided on the absorbent circulation pipeline between the absorbent circulation inlet of the first-stage absorption tower and the outlet of the cooler.
[0008] In order to facilitate the replenishment and recovery of absorbent in the absorption tower, further: the absorbent circulation pipeline at the liquid inlet end of the circulation pump of at least one first-level absorption tower is connected to an absorbent replenishment pipe, the other end of the absorbent replenishment pipe is connected to the absorbent storage tank, and a valve is also provided on the absorbent replenishment pipe; the absorbent circulation pipeline at the liquid outlet end of the circulation pump of at least one first-level absorption tower is connected to an absorbent recovery pipe, the other end of the absorbent recovery pipe is connected to the absorbent recovery tank, and a valve is also provided on the absorbent recovery pipe.
[0009] In order to increase the contact area between the absorbent and the released gas, specifically: each level of absorption tower is a packed absorption tower.
[0010] The adsorption device is used to absorb the adsorbable components that have not been completely absorbed by the absorption towers at each level, so that the gas meets the emission standards. Specifically: the adsorption device is an activated carbon adsorption device.
[0011] In order to avoid backflow of the absorbent in the absorption tower, a one-way valve is further provided on the absorbent circulation pipeline of each absorption tower.
[0012] The bottom of each absorption tower is an absorbent storage chamber. In order to facilitate the monitoring of the absorbent inventory and pH in the absorbent storage chamber, it is further provided that: the bottom of each level of absorption tower is an absorbent storage chamber, at least one level of absorption tower is provided with a liquid level gauge at the bottom, and at least one level of absorption tower is provided with a pH meter at the bottom.
[0013] The etherification reactor safety valve release gas treatment device does not require long-term operation and is only used under specific conditions. To achieve rapid startup of the etherification reactor safety valve release gas treatment device, the etherification reactor safety valve release gas treatment device further includes a controller and a pressure transmitter for monitoring the pressure of the etherification reactor. The pressure transmitter is connected to the controller via telecommunication. The circulation pumps of each absorption tower are also connected to the controller via telecommunication. The cooler and valves on the gas pipeline are also connected to the controller via telecommunication.
[0014] The beneficial effects of the present invention are as follows: the gas discharged from the safety valve of the etherification reactor enters the absorption towers of each stage connected in series through the air inlet pipe, the gas contacts the absorbent in the absorption tower in countercurrent (the flow direction of the gas is low in and high out, and the flow direction of the absorbent is high in and low out), and the absorbent is fully contacted with the gas in the absorption tower by spraying. According to the components of the gas discharged from the safety valve of the etherification reactor, the absorbent of each stage can be selected in a targeted manner, and the gas is processed by the absorption towers of each stage in turn, and finally subjected to adsorption treatment by the adsorption device, so as to meet the high-altitude emission standards. The temperature of the gas discharged from the safety valve of the etherification reactor is relatively high and is discharged quickly. If the discharged gas is directly cooled, the cooling efficiency is low. Therefore, the present invention sets a cooler on the absorbent circulation pipeline of the first-stage absorption tower, and achieves the purpose of quickly cooling the discharged gas by cooling the absorbent of the first-stage absorption tower. Each level of absorption tower adopts appropriate absorbent, which can achieve high-efficiency absorption of the released gas and ensure that the absorbed product has no pollution to the environment, ensuring the safety of the etherification reactor during operation and achieving low-cost operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The utility model is a schematic diagram of an embodiment of a gas treatment device for a safety valve of an etherification reactor.
[0016] Figure numerals: absorption tower 1, air inlet 1-1, air outlet 1-2, waste pipe 1-3, absorbent circulation pipe 1-4, circulation pump 1-5, absorbent replenishing pipe 1-6, absorbent recovery pipe 1-7, liquid level meter 1-8, pH meter 1-9, air inlet pipe 2-1, air passage pipe 2-2, external discharge pipe 2-3, etherification reactor 3, safety valve 3-1, adsorption device 4, cooler 5, cooling water upstream pipe 5-1, cooling water downstream pipe 5-2, absorbent storage tank 6, absorbent recovery tank 7, one-way valve 8, pressure transmitter 9. DETAILED DESCRIPTION
[0017] The present invention will be further described below with reference to the accompanying drawings.
[0018] The utility model is used to process the gas released from the safety valve of the etherification reactor, and the treated gas can be directly discharged. Figure 1As shown, the gas treatment device for the safety valve discharge of the etherification reactor of the present invention includes at least two stages of absorption towers 1, and the absorption towers 1 of each stage are arranged in series. When the amount of gas discharged by the safety valve 3-1 of the etherification reactor 3 is large, more stages of absorption towers 1 can be used in series. An air inlet 1-1 is provided at the bottom of each absorption tower 1 and an exhaust port 1-2 is provided at the top. The gas entering the absorption tower flows from bottom to top. The exhaust port 1-2 of the previous stage absorption tower 1 is connected to the air inlet 1-1 of the next stage absorption tower 1 through an air pipe 2-2, thereby realizing the series arrangement of the absorption towers 1 of each stage. The number of air pipes 2-2 is one less than the number of stages of the absorption tower 1, and at least one air pipe 2-2 is provided with a valve so that the corresponding air pipe 2-2 can be blocked. For example, in Figure 1 In the illustrated embodiment, the absorption tower 1 is a two-stage absorption tower 1, which is connected by a gas pipe 2-2. A valve is provided on the gas pipe 2-2, and the valve should be kept in a normally closed state. When the absorbent in the first-stage absorption tower 1 is a volatile substance, the absorbent in the first-stage absorption tower 1 (for example, isopropyl alcohol) can be prevented from volatilizing through the exhaust port 1-2 at the top.
[0019] The air inlet 1-1 of the first-stage absorption tower 1 is connected to an air inlet pipe 2-1, which is connected to the safety valve 3-1 of the etherification reactor 3. This pipe 2-1 allows the gas released from the safety valve 3-1 of the etherification reactor 3 to enter the first-stage absorption tower 1. The exhaust port 1-2 of the final-stage absorption tower 1 is connected to an exhaust pipe 2-3, which is equipped with an adsorption device 4. After being treated by each stage of the adsorption tower 1, the released gas enters the exhaust pipe 2-3, which can be connected to an overhead discharge device. The adsorption device 4 is used to absorb harmful components in the gas that have not been removed, ensuring that the discharged gas meets emission standards. For example, the adsorption device 4 is an activated carbon adsorption device.
[0020] Each absorber 1 is also equipped with an absorbent circulation outlet and inlet at the bottom and top, respectively. One end of the absorbent circulation outlet located within the absorber 1 is connected to a spraying device. Each absorber 1 is connected to the absorbent circulation outlet and inlet via an absorbent circulation pipeline 1-4. This pipeline is equipped with a circulation pump 1-5 and at least one valve. The circulation pump 1-5, typically a centrifugal pump, provides power for the circulation of the absorbent. After entering the absorber 1, the absorbent is sprayed downward through the spraying device, where it comes into countercurrent contact with the gas within the absorber 1, ensuring sufficient contact between the absorbent and the gas. To increase the contact area between the absorbent and the released gas, each absorber 1 is a packed absorber. The materials of the absorber 1 body and packing are designed to be compatible with methyl chloride, sodium hydroxide, and toluene. To prevent backflow of the absorbent within the absorbent circulation pipeline 1-4, each absorber 1 is also equipped with a one-way valve 8. One-way valve 8 prevents the absorbent from flowing back into circulation pump 1-5, which could affect its operation. For example, one-way valve 8 is installed at the liquid outlet of circulation pump 1-5. Each absorption tower 1 is provided with a waste pipe 1-3 at its bottom. This pipe is equipped with a valve that blocks the waste pipe 1-3. The valve allows the absorbent in the absorption tower 1 to reach a predetermined state before opening the waste pipe 1-3. The waste liquid discharged from the waste pipe 1-3 enters the wastewater treatment system. The waste pipes 1-3 of each absorption tower 1 can be connected to a main waste pipe, which then enters the wastewater treatment system.
[0021] The temperature of the gas discharged from the safety valve 3-1 of the etherification reactor 3 is relatively high, and the gas needs to be cooled to a temperature range suitable for removing harmful components through the adsorbent. A cooler 5 is also provided on the absorbent circulation pipeline 1-4 of the first-stage absorption tower 1. The cooler 5 is used to cool the absorbent of the first-stage absorption tower 1, and then cool the discharged gas in the first-stage absorption tower 1, to avoid the problem of low efficiency in directly cooling the gas discharged from the safety valve 3-1 of the etherification reactor 3. The cooler 5 can be set at any position of the absorbent circulation pipeline 1-4 of the first-stage absorption tower 1. In order to improve the cooling efficiency of the cooler 5 on the absorbent, the cooler 5 is located on the absorbent circulation pipeline 1-4 between the liquid outlet of the circulation pump 1-5 of the first-stage absorption tower 1 and the absorbent circulation inlet, and the cooler 5 is arranged at a position close to the absorbent circulation inlet, so that the cooled absorbent directly and quickly enters the first-stage absorption tower 1 and contacts the countercurrent gas by spraying. The cooler 5 only needs to be able to cool the absorbent, for example, the cooler 5 is a water-cooled cooler. Figure 1As shown, cooler 5 is a water-cooled cooler equipped with a cooling water upper pipe 5-1 and a cooling water lower pipe 5-2. To reduce the impact of ambient temperature on cooler 5, cooling water upper pipe 5-1, and cooling water lower pipe 5-2, these pipes are insulated. The absorbent circulation pipe 1-4 between cooler 5 and the absorbent circulation inlet is also insulated. To facilitate monitoring of the absorbent cooling effect of cooler 5, a thermometer is also installed on the absorbent circulation pipe 1-4 between the absorbent circulation inlet of the first-stage absorber 1 and the outlet of cooler 5.
[0022] To facilitate absorbent replenishment in the absorption tower 1, the absorbent circulation pipe 1-4 at the liquid inlet end of the circulating pump 1-5 of at least one primary absorption tower 1 is connected to an absorbent replenishment pipe 1-6. The other end of the absorbent replenishment pipe 1-6 is connected to the absorbent storage tank 6 and is also equipped with a valve. To facilitate absorbent replenishment in each absorption tower 1, the absorbent circulation pipe 1-4 at the liquid inlet end of the circulating pump 1-5 of each absorption tower 1 is connected to an absorbent replenishment pipe 1-6. The absorbent replenishment pipe 1-6 is connected to the absorbent circulation pipe 1-4 at the liquid inlet end of the circulating pump 1-5. When the absorbent in the absorption tower 1 is insufficient, the circulating pump 1-5 can replenish the absorption liquid. To facilitate absorbent recovery in the absorption tower 1, the absorbent circulation pipe 1-4 at the liquid outlet end of the circulating pump 1-5 of at least one primary absorption tower 1 is connected to an absorbent recovery pipe 1-7. The other end of the absorbent recovery pipe 1-7 is connected to the absorbent recovery tank 7 and is also equipped with a valve. After the gas released from the safety valve 3-1 of the etherification reactor 3 is processed, the circulation pump 1-5 can also transport the absorbent to the absorbent recovery tank 7. In order to facilitate the recovery of absorbent by the absorption towers 1 at each level, the absorbent circulation pipeline 1-4 at the liquid outlet end of the circulation pump 1-5 of each level of the absorption tower 1 is connected to the absorbent recovery pipe 1-7. Figure 1 In the illustrated embodiment, the absorption tower 1 is a two-stage absorption tower 1, the absorbent of the first-stage absorption tower 1 is isopropyl alcohol, and the absorbent of the second-stage absorption tower 1 is alkali solution. The absorbent circulation pipe 1-4 at the liquid inlet end of the circulation pump 1-5 of the two-stage absorption tower 1 is connected to an absorbent replenishing pipe 1-6, and the other ends of the two absorbent replenishing pipes 1-6 are connected to different absorbent storage tanks 6 so as to replenish different absorbents to the two-stage absorption tower 1; in the two-stage absorption tower 1, only the first-stage absorption tower 1 is provided with an absorbent recovery pipe 1-7, and the other end of the absorbent recovery pipe 1-7 is connected to the absorbent recovery tank 7.
[0023] exist Figure 1In the illustrated embodiment, the absorption tower 1 comprises two stages. The first stage absorber is isopropyl alcohol, which absorbs toluene, propylene oxide, and alcohols in the released gas. The absorbed solution can be recovered and reused via solvent recovery. The second stage absorber is an alkaline solution, typically sodium hydroxide solution, which absorbs methyl chloride in the gas and converts it into methanol and sodium chloride. Methanol, a small molecule that is easily degraded, also absorbs the isopropyl alcohol volatilized from the first stage absorber.
[0024] The bottom of each absorption tower 1 is an absorbent storage chamber, which is used to temporarily store adsorbents and waste liquids. In order to facilitate monitoring of the amount of absorbent in the absorbent storage chamber and the pH value, the bottom of each level of absorption tower 1 is an absorbent storage chamber, and at least one level of absorption tower 1 is provided with a liquid level gauge 1-8 at the bottom, and at least one level of absorption tower 1 is provided with a pH meter 1-9 at the bottom. Since the liquid level of the absorbent storage chamber of each level of absorption tower 1 changes, it is best to set a liquid level gauge 1-8 at the bottom of each level of absorption tower 1. Since not every level of absorption tower 1 needs to monitor the pH value, only the bottom of the absorption tower 1 that needs to monitor the pH value is provided with a pH meter 1-9. For example, Figure 1 In the embodiment shown, the absorption tower 1 is a two-stage absorption tower. Liquid level gauges 1-8 are provided at the bottom of both absorption towers 1, and only a pH meter 1-9 is provided at the bottom of the second absorption tower 1.
[0025] The etherification reactor safety valve release gas treatment device does not require long-term operation and is only used under specific conditions. To ensure rapid startup, the etherification reactor safety valve release gas treatment device also includes a controller and a pressure transmitter 9 for monitoring the pressure of the etherification reactor 3. The pressure transmitter 9 is connected to the controller, as are the circulation pumps 1-5 of each absorption tower 1, the cooler 5, and the valves on the gas pipe 2-2. When the pressure transmitter 9 detects that the pressure of the etherification reactor 3 exceeds a set value (which is no higher than the trip pressure of the safety valve 3-1 of the etherification reactor 3), the controller opens the valve on the gas pipe 2-2, turns on the cooler 5, and starts each circulation pump 1-5, thus commencing operation of each absorption tower 1. After the pressure of the etherification reactor 3 drops to atmospheric pressure, the circulation pumps 1-5, any valves, and any other components that require closure are manually closed.
[0026] If the cooler 5 is a water-cooled cooler, the cooling water upper pipe 5-1 and the cooling water lower pipe 5-2 of the water-cooled cooler can each be equipped with a valve and connected to the controller by telecommunication. The liquid level gauge 1-8 at the bottom of each absorption tower 1 is preferably a liquid level gauge that can display the liquid level and remotely transmit the liquid level signal. The liquid level gauge 1-8 is connected to the controller by telecommunication to facilitate timely and automatic replenishment of the absorbent. A thermometer is provided on the absorbent circulation pipe 1-4 between the absorbent circulation inlet of the first-stage absorption tower 1 and the outlet of the cooler 5. This thermometer is also preferably connected to the controller by telecommunication to automatically control the cooler 5 to maintain the absorbent at an appropriate temperature.
Claims
1. Etherification reactor safety valve discharge gas treatment device, characterized by: The invention comprises at least two absorption towers (1), wherein the absorption towers (1) of each stage are arranged in series, and each absorption tower (1) is provided with an air inlet (1-1) at the bottom and an exhaust port (1-2) at the top. The exhaust port (1-2) of the first absorption tower (1) is connected to the air inlet (1-1) of the next absorption tower (1) through an air pipe (2-2). At least one of the air pipes (2-2) is provided with a valve. The air inlet (1-1) of the first absorption tower (1) is connected to an air inlet pipe (2-1) for connecting to a safety valve (3-1) of an etherification reaction kettle (3). The exhaust port (1-2) of the last absorption tower (1) is connected to an external exhaust pipe (2-3). The external exhaust pipe (2-3) is connected to the exhaust port (1-2) of the last absorption tower (1). -3) is provided with an adsorption device (4); a waste pipe (1-3) is provided at the bottom of each absorption tower (1), and a valve is provided on the waste pipe (1-3); an absorbent circulation outlet and an absorbent circulation inlet are respectively provided at the bottom and top of each absorption tower (1), and one end of the absorbent circulation outlet located inside the absorption tower (1) is also connected to a spray device; the absorbent circulation inlets and outlets of each absorption tower (1) are respectively connected through an absorbent circulation pipeline (1-4), and a circulation pump (1-5) and at least one valve are provided on the absorbent circulation pipeline (1-4); and a cooler (5) is also provided on the absorbent circulation pipeline (1-4) of the first-stage absorption tower (1).
2. The etherification reactor safety valve discharge gas treatment device according to claim 1, characterized in that: The cooler (5) is located on the absorbent circulation pipe (1-4) between the liquid outlet of the circulation pump (1-5) of the first-stage absorption tower (1) and the absorbent circulation inlet, and the cooler (5) is arranged at a position close to the absorbent circulation inlet.
3. The etherification reactor safety valve discharge gas treatment device according to claim 1, characterized in that: The cooler (5) is a water-cooled cooler, which is provided with a cooling water upper water pipe (5-1) and a cooling water lower water pipe (5-2). The absorbent circulation pipeline (1-4) between the cooler (5) and the absorbent circulation inlet is provided with a thermal insulation layer. The water-cooled cooler, the cooling water upper water pipe (5-1) and the cooling water lower water pipe (5-2) are also provided with a thermal insulation layer.
4. The etherification reactor safety valve discharge gas treatment device according to claim 1, characterized in that: A thermometer is also provided on the absorbent circulation pipeline (1-4) between the absorbent circulation inlet of the first-stage absorption tower (1) and the outlet of the cooler (5).
5. The etherification reactor safety valve discharge gas treatment device according to claim 1, characterized in that: An absorbent circulation pipe (1-4) at the liquid inlet end of a circulation pump (1-5) of at least one primary absorption tower (1) is connected to an absorbent replenishing pipe (1-6), the other end of the absorbent replenishing pipe (1-6) is connected to an absorbent storage tank (6), and a valve is further provided on the absorbent replenishing pipe (1-6); an absorbent circulation pipe (1-4) at the liquid outlet end of a circulation pump (1-5) of at least one primary absorption tower (1) is connected to an absorbent recovery pipe (1-7), the other end of the absorbent recovery pipe (1-7) is connected to an absorbent recovery tank (7), and a valve is further provided on the absorbent recovery pipe (1-7).
6. The etherification reactor safety valve discharge gas treatment device according to claim 1, characterized in that: Each level of absorption tower (1) is a packed absorption tower.
7. The etherification reactor safety valve discharge gas treatment device according to claim 1, characterized in that: The adsorption device (4) is an activated carbon adsorption device.
8. The etherification reactor safety valve discharge gas treatment device according to claim 1, characterized in that: A one-way valve (8) is also provided on the absorbent circulation pipeline (1-4) of each absorption tower (1).
9. The etherification reactor safety valve discharge gas treatment device according to claim 1, characterized in that: The bottoms of each level of absorption tower (1) are absorbent storage chambers, the bottom of at least one level of absorption tower (1) is provided with a liquid level meter (1-8), and the bottom of at least one level of absorption tower (1) is provided with a pH meter (1-9).
10. The device for treating gas released from a safety valve of an etherification reactor according to any one of claims 1 to 9, characterized in that: The invention also includes a controller and a pressure transmitter (9) for monitoring the pressure of the etherification reaction kettle (3). The pressure transmitter (9) is connected to the controller via telecommunication. The circulation pumps (1-5) of each level of the absorption tower (1) are all connected to the controller via telecommunication. The cooler (5) and the valves on the gas pipeline (2-2) are all connected to the controller via telecommunication.