A sulfonic acid sampling residual liquid recovery device

Abstract

The present application relates to the technical field of sulfonic acid production, in particular to a sulfonic acid sampling residual liquid recovery device, which comprises a sulfonic acid storage tank and a main sulfonic acid pipeline connected thereto, a sampling branch pipeline is arranged at the end of the main sulfonic acid pipeline, a sampling shunt node is arranged at the end of the sampling branch pipeline, a sample outlet channel and a residual liquid drainage channel are connected to the sampling shunt node respectively, the outlet end of the residual liquid drainage channel is connected to a residual liquid collection tank, the discharge end of the residual liquid collection tank is connected to the main sulfonic acid pipeline through a reflux channel, the outlet end of the sample outlet channel is connected to a sampling bottle, and a purging mechanism is further arranged and connected to the sampling branch pipeline and the residual liquid collection tank. When sampling, fresh samples flow into the sampling bottle through the sample outlet channel, residual liquids in the front section and purging residual liquids flow into the residual liquid collection tank through the residual liquid drainage channel, and then are pumped back to the main sulfonic acid pipeline through the reflux channel. The sulfonic acid sampling residual liquid recovery device realizes closed recovery and automatic control of sulfonic acid sampling residual liquids, avoids material waste and environmental pollution, ensures sampling accuracy, and prevents pipeline blockage.

Description

Technical Field

[0001] This invention relates to the field of sulfonic acid production technology, specifically to a sulfonic acid sampling residue recovery device. Background Technology

[0002] Sulfonic acids are important organic chemical raw materials and intermediates, widely used in surfactants, dyes, pharmaceuticals, pesticides, and synthetic materials. In the production of sulfonic acids, to ensure product quality stability and process control precision, routine quality control in the sulfonic acid finished product tank area requires regular sampling and testing of the finished sulfonic acid in the tanks. This includes detecting key indicators such as free acid, moisture, and color to determine whether the finished product quality meets standards and whether the storage in the tanks is stable.

[0003] In the sampling operation of sulfonic acid production plants, samples are typically collected from the main pipeline or reactor via sampling valves for testing indicators such as acid value, color, and active ingredient content. For example, patent publication number CN207923534U discloses an online sampling device for sodium sulfonate production, which includes a sampling dish bottom container, a diversion sampling tube, and a sampling discharge tube. The bottom container has an inner sleeve vertically installed at its bottom, with its upper end protruding from the upper surface of the container. The diversion sampling tube is connected to the inner sleeve. One end of the sampling discharge tube is connected to the bottom side wall of the sampling dish bottom container. Both the diversion sampling tube and the sampling discharge tube are equipped with control valves. This solution improves the structure of the sampling device, enabling online sampling without material waste.

[0004] However, after the sampling operation, some sulfonic acid inevitably remains in the sampling valve cavity, the sample outlet tube, and the sampling bottle interface after the sampling operation. If these residual liquids are discharged directly, they will not only cause direct loss of materials but also cause environmental pollution. On-site, they usually rely on manual collection and storage using plastic or iron buckets. Frequent sampling generates a large amount of excess sulfonic acid residual liquid. Manual collection in buckets is labor-intensive and cumbersome. Moreover, the residual liquid in the buckets is easily spilled and volatilized when left in the open, causing corrosion to the ground and equipment. If left to stagnate for a long time, the residual liquid will gradually accumulate on the inner wall of the pipe. When sampling again, it will mix with the newly collected sample, causing sample contamination and affecting the authenticity and accuracy of the analysis and test results. Furthermore, sulfonic acid will absorb moisture from the air, causing local dilution, adhesion, carbonization, and even crystallization. This will gradually block the sampling pipeline and cause difficulty in valve core rotation, flow channel narrowing, and sealing surface failure, requiring frequent manual cleaning. Summary of the Invention

[0005] The purpose of this invention is to provide a sulfonic acid sampling residue recovery device to solve the problems mentioned in the background art, where the residue cannot be recovered to the production system after the sampling operation, which easily leads to material loss and the residue gradually accumulates on the inner wall of the pipeline, causing blockage.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sulfonic acid sampling residue recovery device, comprising a sulfonic acid storage tank, wherein the sulfonic acid storage tank is connected to a main sulfonic acid pipeline for the inflow of finished sulfonic acid product, and further comprising: A sampling branch pipe is drawn from the main sulfonic acid pipeline for sampling sample outflow. The sampling branch pipe is provided with a sampling diversion node at its end to distribute the sampling fluid to the sample outlet channel and the residual liquid drainage channel. A residual liquid collection tank is connected to the outlet end of the residual liquid diversion channel. The discharge end of the residual liquid collection tank is provided with a return channel. The discharge end of the return channel is connected to the main sulfonic acid pipeline for transporting the residual liquid in the residual liquid collection container back to the main sulfonic acid pipeline. A sampling bottle connected to the outlet end of the sampling channel for collecting samples for testing; The purging mechanism, which is connected to the sampling branch pipe and the residual liquid collection tank, is used to pneumatically purge the sampled residual fluid and assist in the return of residual liquid.

[0007] Preferably, the sampling branch pipe is connected to a straight section of the sulfonic acid main pipeline, and a switch valve is provided at one end of the sampling branch pipe leading out from the sulfonic acid main pipeline.

[0008] Preferably, the sampling diversion node includes a sampling control valve, which is a three-way valve. Its inlet end is connected to the end of the sampling branch pipe, and its outlet end is connected to the sample outlet channel and the residual liquid drainage channel, respectively.

[0009] Preferably, the residual liquid collection tank is a vertical cylindrical tank. Multiple interface components are distributed on the top end face of the residual liquid collection container. Each interface component includes a residual liquid inlet, an exhaust port, and a purging access end. The residual liquid drainage channel communicates with the interior of the residual liquid collection container through the residual liquid inlet. The exhaust port is used to discharge replacement gas during purging operations. A residual liquid outlet is provided in the central area of ​​the bottom of the residual liquid collection container, and the return channel communicates with the interior of the residual liquid collection container through the residual liquid outlet. The reflux channel is equipped with a reflux power component and an anti-backflow component. The reflux power component is a reflux pump installed on the inlet side of the reflux channel, and the anti-backflow component is a check valve installed on the side of the reflux channel near the main sulfonic acid pipeline. A switch valve is also provided on the pipeline of the reflux channel between the reflux pump and the residual liquid collection container.

[0010] Preferably, the purging mechanism includes a purging main pipe, from which a first purging branch pipe and a second purging branch pipe are connected in parallel. The first purging branch pipe is internally connected to the sampling branch pipe, and the second purging branch pipe is internally connected to the residual liquid collection container through a purging access end.

[0011] Preferably, both the first purge branch pipe and the second purge branch pipe are connected in series with a shut-off valve, and a check valve is also provided on the pipeline between the sampling branch pipe and the shut-off valve on the first purge branch pipe.

[0012] Preferably, the residual liquid collection container is equipped with a liquid level detector to acquire the liquid level height signal in the residual liquid collection container in real time; The device also includes a control unit, which is electrically connected to the level sensor and the reflux power assembly, respectively, and is used to control the operation or shutdown of the reflux power assembly.

[0013] Preferably, the control unit is also communicatively connected to the shut-off valve on the purging mechanism for pneumatic cleaning and purging replacement of the sampling branch pipe and the inside of the residual liquid collection tank.

[0014] Preferably, the outer wall of the residual liquid drainage channel and / or the return pipeline is wrapped with a heat tracing structure.

[0015] Preferably, the heat tracing structure is a heating jacket or electric heat tracing tape wrapped around the outside of the pipe wall, and the heat tracing structure maintains the physical properties of the sulfonic acid fluid inside the pipe through heat conduction.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) The sulfonic acid sampling residual liquid recovery device is equipped with a dedicated residual liquid return pipeline. By leading out a sampling branch pipe from the main sulfonic acid pipeline, and setting a sampling diversion node at the end of the sampling branch pipe, the sampling fluid is distributed to the sampling channel and the residual liquid diversion channel. Through the cooperation of the residual liquid collection tank and the return channel, all the residual liquid introduced into the residual liquid diversion channel and the residual sulfonic acid purged and cleaned after sampling are collected and pumped back to the main sulfonic acid pipeline to achieve closed-loop recovery. This completely avoids the material waste and environmental pollution caused by direct discharge of residual liquid. It also eliminates the need for manual collection using buckets and eliminates the safety hazards of residual liquid spillage and volatilization causing corrosion to equipment and ground during manual collection.

[0017] (2) The sulfonic acid sampling residual liquid recovery device is equipped with a purging mechanism and a control unit working together. The first purging branch of the purging mechanism can introduce inert gas into the sampling branch to purge the residual sulfonic acid fluid in the dead corner of the pipeline to the residual liquid collection tank. The second purging branch can introduce inert gas into the residual liquid collection tank to assist the residual liquid in flowing into the return channel and purge the inner wall of the tank by airflow disturbance after the return is completed. Combined with the liquid level detector to detect the liquid level in the tank in real time, and the control unit to automatically control the start and stop of the return pump according to the high and low liquid level thresholds, the automatic closed-loop control of residual liquid collection, purging and cleaning and automatic return is realized. It effectively avoids the problem of residual liquid gradually accumulating on the inner wall of the pipeline, carbonization and crystallization leading to blockage of the sampling pipeline and difficulty in valve core rotation, and significantly reduces the frequency of manual cleaning and maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a sulfonic acid sampling residue recovery device according to the present invention; Figure 2 This invention relates to a sulfonic acid sampling residue recovery device. Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of the residual liquid collection tank structure of a sulfonic acid sampling residual liquid recovery device according to the present invention; Figure 4 This is a schematic diagram of the connection structure between the reflux channel and the main sulfonic acid pipeline of a sulfonic acid sampling residual liquid recovery device according to the present invention; Figure 5 This is a schematic diagram of the purging mechanism of a sulfonic acid sampling residue recovery device according to the present invention; Figure 6 This is a schematic diagram of the sulfonic acid flow channel in a sulfonic acid sampling residue recovery device according to the present invention; Figure 7 This is a schematic diagram of the heating structure of a sulfonic acid sampling residue recovery device according to the present invention.

[0019] In the diagram: 1. Sulfonic acid storage tank; 101. Sulfonic acid main pipeline; 2. Sampling branch pipe; 3. Sampling control valve; 4. Sampling channel; 401. Sampling bottle; 5. Residual liquid drainage channel; 6. Residual liquid collection tank; 7. Reflux channel; 8. Reflux pump; 9. Check valve; 10. Switch valve; 11. Purge mechanism; 111. Purge main pipe; 112. First purging branch pipe; 113. Second purging branch pipe; 12. Shut-off valve; 13. Exhaust port; 14. Liquid level gauge; 15. Heating structure. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-7This invention provides a technical solution: a sulfonic acid sampling residual liquid recovery device, comprising a sulfonic acid storage tank 1, wherein the sulfonic acid storage tank 1 is connected to a sulfonic acid main pipeline 101 for the inflow of finished sulfonic acid, and further comprising: a sampling branch pipe 2 extending from the sulfonic acid main pipeline 101 for the outflow of sample, wherein the end of the sampling branch pipe 2 is provided with a sampling diversion node for distributing the sampled fluid to a sample outlet channel 4 and a residual liquid drainage channel 5; a residual liquid collection tank 6 connected to the outlet end of the residual liquid drainage channel 5, wherein the outlet end of the residual liquid collection tank 6 is provided with a return channel 7, the outlet end of the return channel 7 being connected to the sulfonic acid main pipeline 101 for transporting the residual liquid in the residual liquid collection tank 6 back to the sulfonic acid main pipeline 101; a sampling bottle 401 connected to the outlet end of the sample outlet channel 4 for collecting samples for testing; and a purging mechanism 11 connected to the sampling branch pipe 2 and the residual liquid collection tank 6 for pneumatic purging of the sampled residual fluid and assisting in residual liquid return.

[0022] Specifically, the sulfonic acid main pipeline 101 is connected to the inlet of the sulfonic acid storage tank 1, and is used to transport the sulfonic acid product obtained from the upstream production unit to the sulfonic acid storage tank 1 for storage. The sampling branch pipe 2 is led out from the pipe wall of the sulfonic acid main pipeline 101 to form a sampling diversion path. During sampling, the sulfonic acid product flows from the sulfonic acid main pipeline 101 into the sampling branch pipe 2. After being distributed by the sampling diversion node, part of it is used as a test sample and flows into the sampling bottle 401 through the sampling outlet channel 4. The other part is used as the front-end residual liquid or replacement waste liquid and is introduced into the residual liquid collection tank 6 through the residual liquid diversion channel 5 for temporary storage. After sampling, the purging mechanism 11 introduces inert gas into the sampling branch pipe 2 and the residual liquid collection tank 6 to purge the sulfonic acid fluid remaining in the inner wall of the pipeline and the valve cavity, and assists the residual liquid in the residual liquid collection tank 6 to return to the sulfonic acid main pipeline 101 through the return channel 7 to realize the closed-loop recovery of residual liquid.

[0023] Furthermore, the sampling branch pipe 2 is connected to the straight section of the sulfonic acid main pipeline 101, and a switch valve 10 is provided at one end of the sampling branch pipe 2 leading out of the sulfonic acid main pipeline 101. The fluid flow in the straight section of the sulfonic acid main pipeline 101 is stable with low turbulence. Connecting the sampling branch pipe 2 at this position ensures that the sample taken from the stable flow of the finished product is representative, avoiding sampling deviations caused by uneven fluid flow at pipe bends, diameter changes, or valves, thereby making the subsequent laboratory analysis data more accurate and reliable. The switch valve 10 is located near the connection end of the sampling branch pipe 2 and the sulfonic acid main pipeline 101, and is used to control the flow of the sample into the sampling branch pipe 2. In the non-sampling state, the switch valve 10 remains closed to prevent the finished product in the sulfonic acid main pipeline 101 from continuously flowing into the sampling branch pipe 2, causing unnecessary material waste or pipeline pressure buildup.

[0024] The sampling diversion node includes a sampling control valve 3, which is a three-way valve. Its inlet is connected to the end of the sampling branch pipe 2, and its outlet is connected to the sample outlet channel 4 and the residual liquid drainage channel 5, respectively. The sampling control valve 3 adopts a three-way reversing valve structure. By switching the valve core position, the sulfonic acid fluid introduced by the sampling branch pipe 2 can be selectively guided to the sample outlet channel 4 or the residual liquid drainage channel 5. In the initial stage of sampling, the sampling control valve 3 can be switched to the residual liquid drainage channel 5 to discharge a small amount of sulfonic acid that may be mixed with pipeline residues or deposits into the residual liquid collection tank 6. After the fluid flow stabilizes, the sampling control valve 3 can be switched to the sample outlet channel 4 to allow clean and fresh sulfonic acid samples to flow into the sampling bottle 401, thereby ensuring that the samples collected in the sampling bottle 401 are truly representative and avoiding interference from the residual fluid in the front section on the test results.

[0025] In this embodiment, the residual liquid collection tank 6 is a vertical cylindrical tank. The top end face of the residual liquid collection tank 6 is distributed with multiple interface components. The interface components include a residual liquid inlet, an exhaust port 13, and a purging access end. The residual liquid diversion channel 5 communicates with the interior of the residual liquid collection tank 6 through the residual liquid inlet. The exhaust port 13 is used to discharge replacement gas during purging operations. The bottom center area of ​​the residual liquid collection tank 6 is provided with a residual liquid outlet. The return channel 7 communicates with the interior of the residual liquid collection tank 6 through the residual liquid outlet. The residual liquid inlet, exhaust port 13, and purging access end are distributed on the top end face of the tank. Each interface does not interfere with the others, which facilitates pipeline connection and maintenance. The exhaust port 13 is connected to the waste gas treatment system through a pipeline. When the residual liquid enters the residual liquid collection tank 6 through the residual liquid diversion channel 5, the gas in the tank can be discharged in time through the exhaust port 13 to prevent the pressure inside the tank from affecting the smooth flow of the residual liquid. When the purging mechanism 11 introduces inert gas into the tank for purging and auxiliary drainage, the exhaust port 13 also serves as the discharge channel for the replacement gas to maintain the pressure balance inside the tank.

[0026] The reflux channel 7 is equipped with a reflux power component and an anti-backflow component. The reflux power component is a reflux pump 8 installed on the inlet side of the reflux channel 7. The anti-backflow component is a check valve 9 installed on the side of the reflux channel 7 near the sulfonic acid main pipeline 101. A switch valve 10 is also provided on the pipeline of the reflux channel 7 between the reflux pump 8 and the residual liquid collection tank 6. A switch valve 10, a reflux pump 8, and a check valve 9 are connected in series along the fluid transport direction on the reflux channel 7. The reflux pump 8 provides power for the reflux of residual liquid, pressurizes the sulfonic acid residual liquid temporarily stored in the residual liquid collection tank 6, and then transports it back to the sulfonic acid main pipeline 101. The check valve 9 is located at the discharge end of the reflux channel 7 near the sulfonic acid main pipeline 101. Its conduction direction is from the reflux pump 8 to the sulfonic acid main pipeline 101. It can effectively prevent the material from flowing back into the reflux pump 8 or the residual liquid collection tank 6 through the reflux channel 7 when the pressure in the sulfonic acid main pipeline 101 is high, thus avoiding material contamination and equipment damage caused by backflow. The outlet end of the reflux channel 7 is connected to the downstream of the sampling branch pipe 2 outlet on the sulfonic acid main pipeline 101. That is, the connection point between the reflux channel 7 and the sulfonic acid main pipeline 101 is located downstream of the connection point between the sampling branch pipe 2 and the sulfonic acid main pipeline 101. This setting can prevent the residual liquid returned through the reflux channel 7 from flowing back into the sampling branch pipe 2, and prevent the reflux material from being mixed into the sampling branch pipe 2, which would affect the purity of the sample in the next sampling.

[0027] Furthermore, the purging mechanism 11 includes a purging main pipe 111, from which a first purging branch pipe 112 and a second purging branch pipe 113 are connected in parallel. The first purging branch pipe 112 is internally connected to the sampling branch pipe 2, and the second purging branch pipe 113 is internally connected to the residual liquid collection tank 6 through a purging access end. The inlet end of the purging main pipe 111 is connected to an external inert gas source, which can be a nitrogen source. Nitrogen is chemically stable, inexpensive, and readily available. It does not react with sulfonic acid and does not introduce moisture or oxygen, effectively preventing sulfonic acid from oxidizing or deteriorating or becoming diluted due to contact with air during the purging process. The first purge branch pipe 112 is connected to the pipeline section on the sampling branch pipe 2 located between the switch valve 10 and the sampling control valve 3. It is used to pneumatically purge the residual sulfonic acid fluid in this pipeline section after sampling, and blow the residue along the sampling branch pipe 2 to the sampling control valve 3. Then, the sampling control valve 3 switches to the residual liquid drainage channel 5 to discharge it into the residual liquid collection tank 6. The end of the second purge branch pipe 113 extends into the internal cavity of the residual liquid collection tank 6 to fill the tank with nitrogen. The nitrogen pressure forces the residual liquid collected in the tank from the residual liquid outlet at the bottom into the return channel 7, assisting the return pump 8 in completing the residual liquid transport. In addition, after the return pump 8 stops running, the second purge branch pipe 113 can continue to supply nitrogen. The high-speed airflow disturbs the airflow in the inner wall and bottom dead corner area of ​​the residual liquid collection tank 6, cleaning up the residual liquid adhering to the tank wall or accumulating in the corner. At the same time, the small amount of residual sulfonic acid in the return channel 7 is also blown into the sulfonic acid main pipeline 101, achieving a thorough cleaning of the pipeline and tank.

[0028] Specifically, a shut-off valve 12 is connected in series on both the first purge branch pipe 112 and the second purge branch pipe 113. A check valve 9 is also installed on the pipeline between the sampling branch pipe 2 and the shut-off valve 12 on the first purge branch pipe 112. The shut-off valve 12 on each purge branch pipe is used to independently control the on / off of the purge gas and the purge gas volume of the corresponding flow channel. The operator can choose to purge only the sampling branch pipe 2, only the residual liquid collection tank 6, or both simultaneously, according to actual needs, which improves the flexibility and targeting of the purge operation. The check valve 9 installed on the first purge branch pipe 112 is located in the pipeline section between the sampling branch pipe 2 and the shut-off valve 12. Its conduction direction is from the purge main pipe 111 to the sampling branch pipe 2. It can prevent the sulfonic acid in the sulfonic acid main pipeline 101 or the sampling branch pipe 2 from flowing back into the first purge branch pipe 112, or even the purge main pipe 111 and the external inert gas source system when the pressure fluctuates, so as to avoid the corrosion of the gas pipeline and valve by sulfonic acid and ensure the safety and cleanliness of the purge system.

[0029] In this embodiment, the residual liquid collection tank 6 is equipped with a level gauge 14 for real-time acquisition of the liquid level signal within the tank. The device also includes a control unit, which is electrically connected to both the level gauge 14 and the reflux power assembly, and controls the operation or shutdown of the reflux power assembly. The level gauge 14 is preferably a continuous level gauge, installed from the top of the residual liquid collection tank 6, with its detection probe extending into the internal cavity of the tank. It can detect the liquid level of the residual liquid in the tank in real time and output a corresponding liquid level signal to the control unit. The control unit is a PLC controller or DCS remote station, with data acquisition, logic judgment and control output functions. The control unit has preset high liquid level threshold and low liquid level threshold. The control unit compares and judges the liquid level height signal fed back in real time by the liquid level detector 14 with the preset threshold: when the liquid level height signal reaches or exceeds the high liquid level threshold, it indicates that the residual liquid in the residual liquid collection tank 6 has accumulated to the level that needs to be discharged. The control unit generates a start command to drive the return pump 8 to run, pressurize the collected residual liquid and pump it to the sulfonic acid main pipeline 101 through the return channel 7; when the liquid level height signal drops to or falls below the low liquid level threshold, it indicates that the residual liquid in the tank has been basically discharged. The control unit generates a stop command to shut down the return pump 8. Through the above automatic control logic, the automatic closed-loop recycling of residual liquid is realized. It can not only prevent the liquid level in the residual liquid collection tank 6 from being too high and causing an overflow accident, but also avoid the return pump 8 from running dry for a long time in a state of no liquid or low liquid, which would cause mechanical seal damage or overheating and burnout, thus improving the reliability and safety of the device operation.

[0030] Furthermore, the control unit is also communicatively connected to the shut-off valve 12 on the purging mechanism 11, for pneumatic cleaning and purging replacement of the sampling branch pipe 2 and the residual liquid collection tank 6. After receiving the trigger signal indicating the end of the sampling operation (this trigger signal can be manually triggered by the operator through the control panel, or it can be automatically generated by the system according to the switching action of the sampling control valve 3), the control unit delays for a preset time interval. After the sampling bottle 401 is removed and the sampling control valve 3 is switched to the residual liquid drainage channel 5, a purging control command is generated to open the shut-off valve 12, so that the inert gas flows through the first purging branch pipe 112 and the second purging branch pipe 113 in sequence according to the preset flow rate and preset duration, to pneumatically clean and purge the inside of the sampling branch pipe 2 and the residual liquid collection tank 6, so as to remove the dead corners of the pipeline and the residual sulfonic acid fluid on the inner wall of the tank, and prevent the residual sulfonic acid from oxidizing, deteriorating and crystallizing when it comes into contact with air. After purging, the control unit automatically closes the shut-off valve 12, completing the entire sampling, purging, and recovery cycle. The above-mentioned automatic purging control reduces the intervention of manual operation, lowers the risk of operators coming into contact with sulfonic acid, and ensures the cleanliness of the pipeline system after each sampling.

[0031] In this embodiment, a heat tracing structure 15 is wrapped around the outer wall of the residual liquid drainage channel 5 and / or the return channel 7. The heat tracing structure 15 is tightly attached to the outer surface of the pipe wall of the residual liquid drainage channel 5 and the return channel 7, forming a layered nested structure, which is continuously or intermittently distributed along the length of the pipeline. Sulfonic acid materials have significantly increased viscosity and decreased fluidity when the temperature decreases, and may even crystallize. The heat tracing structure 15 can effectively compensate for the heat lost to the environment during pipeline transportation, maintain the sulfonic acid fluid in the pipe within a suitable flow temperature range, reduce fluid viscosity, and thus assist in the smooth operation of purging and return.

[0032] Specifically, the heat tracing structure 15 is a heating jacket or electric heating tape wrapped around the outside of the pipe wall. The heat tracing structure 15 maintains the physical properties of the sulfonic acid fluid inside the pipe through heat conduction. Hot water or low-pressure steam is introduced into the heating jacket as a heating medium, and heat is evenly transferred to the sulfonic acid fluid inside the pipe through the jacket wall. The electric heating tape utilizes the principle of resistance heating; after being energized, it generates heat and is transferred to the pipe wall through the heat-conducting layer. In addition, the residual liquid collection tank 6 is covered with an insulated protective shell, forming a space between the insulated protective shell and the outer wall of the residual liquid collection tank 6. This space is filled with heat-insulating material, and the outer surface of the insulated protective shell is coated with an anti-corrosion coating to reduce heat loss from the tank, maintain the temperature stability of the residual liquid inside the tank, prevent the sulfonic acid from increasing in viscosity or crystallizing due to cooling inside the tank, and ensure that the residual liquid can be smoothly discharged and transported.

[0033] Working principle: When using this sulfonic acid sampling residual liquid recovery device, first open the switch valve 10 at the end of the sampling branch pipe 2 to allow the sulfonic acid product in the main sulfonic acid pipeline 101 to flow into the sampling branch pipe 2. During the initial sampling stage, switch the sampling control valve 3 to the residual liquid drainage channel 5, allowing the sulfonic acid fluid, which may contain impurities, to flow into the residual liquid collection tank 6 for temporary storage. After the fluid flow stabilizes, switch the sampling control valve 3 to the sample outlet channel 4, allowing the fresh sulfonic acid sample to flow into the sampling bottle 401, completing the sample collection. After the sampling bottle 401 is removed, switch the sampling control valve 3 back to the residual liquid drainage channel 5 and close the switch valve 10 on the sampling branch pipe 2. The control unit delays the start of the purging mechanism 11, opens the shut-off valve 12 on the first purging branch pipe 112, and blows nitrogen into the sampling branch pipe 2 through the first purging branch pipe 112. The residual sulfonic acid on the pipe wall is blown along the pipeline to the residual liquid drainage channel 5 and finally enters the residual liquid collection tank 6. After the purging is completed, the shut-off valve 12 on the first purging branch pipe 112 is closed.

[0034] The liquid level sensor 14 inside the residual liquid collection tank 6 monitors the liquid level in real time. When the liquid level reaches the preset high liquid level threshold, the control unit automatically starts the reflux pump 8 and simultaneously opens the switch valve 10 on the reflux channel 7, pumping the collected sulfonic acid residue back into the sulfonic acid main pipeline 101 via the reflux channel 7 and check valve 9. During the reflux process, the control unit automatically controls the operation of the reflux pump 8 based on the liquid level signal. When the liquid level drops to the low liquid level threshold, the control unit shuts off the reflux pump 8 and the switch valve 10. After the reflux is completed, the control unit opens the shut-off valve 12 on the second purge branch pipe 113, allowing nitrogen gas to enter the interior of the residual liquid collection tank 6 through the second purge branch pipe 113. The airflow is used to purge and clean the inner wall and bottom dead corners of the tank, while simultaneously blowing the residual sulfonic acid in the reflux channel 7 into the sulfonic acid main pipeline 101. The heating structure 15 heats and insulates the residual liquid diversion channel 5 and the reflux channel 7 throughout the sampling and recovery process, ensuring that the sulfonic acid is always maintained in a low-viscosity flow state.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sulfonic acid sampling residue recovery device, comprising a sulfonic acid storage tank (1), wherein the sulfonic acid storage tank (1) is connected to a main sulfonic acid pipeline (101) for the inflow of finished sulfonic acid, characterized in that, Also includes: A sampling branch pipe (2) is drawn from the main sulfonic acid pipeline (101) for sampling sample outflow. The sampling branch pipe (2) is provided with a sampling diversion node at the end for distributing the sampling fluid to the sample outlet channel (4) and the residual liquid drainage channel (5). A residual liquid collection tank (6) is connected to the outlet end of the residual liquid diversion channel (5). The discharge end of the residual liquid collection tank (6) is provided with a return channel (7). The discharge end of the return channel (7) is connected to the sulfonic acid main pipeline (101) for transporting the residual liquid in the residual liquid collection container (6) back to the sulfonic acid main pipeline (101). A sampling bottle (401) for collecting samples for testing is connected to the outlet end of the sampling channel (4). The purging mechanism (11), which is connected to the sampling branch pipe (2) and the residual liquid collection tank (6), is used to pneumatically purge the sampled residual fluid and assist in the return of residual liquid.

2. The sulfonic acid sampling residue recovery device according to claim 1, characterized in that: The sampling branch pipe (2) is connected to the straight section of the sulfonic acid main pipeline (101), and a switch valve (10) is provided at one end of the sampling branch pipe (2) leading out from the sulfonic acid main pipeline (101).

3. The sulfonic acid sampling residue recovery device according to claim 2, characterized in that: The sampling diversion node includes a sampling control valve (3), which is a three-way valve. Its inlet end is connected to the end of the sampling branch pipe (2), and its outlet end is connected to the sample outlet channel (4) and the residual liquid drainage channel (5) respectively.

4. The sulfonic acid sampling residue recovery device according to claim 1, characterized in that: The residual liquid collection tank (6) is a vertical cylindrical tank. Multiple interface components are distributed on the top end face of the residual liquid collection container (6). The interface components include a residual liquid inlet, an exhaust port (13), and a purging access end. The residual liquid drainage channel (5) is connected to the inside of the residual liquid collection container (6) through the residual liquid inlet. The exhaust port (13) is used to discharge replacement gas during purging operations. The bottom center area of ​​the residual liquid collection container (6) is provided with a residual liquid outlet. The return channel (7) is connected to the inside of the residual liquid collection container (6) through the residual liquid outlet. The reflux channel (7) is provided with a reflux power assembly and an anti-backflow assembly. The reflux power assembly is a reflux pump (8) installed on the inlet side of the reflux channel (7). The anti-backflow assembly is a check valve (9) installed on the side of the reflux channel (7) near the sulfonic acid main pipeline (101). A switch valve (10) is also provided on the pipeline of the reflux channel (7) between the reflux pump (8) and the residual liquid collection container (6).

5. The sulfonic acid sampling residue recovery device according to claim 4, characterized in that: The purging mechanism (11) includes a purging main pipe (111), and a first purging branch pipe (112) and a second purging branch pipe (113) connected in parallel are led out from the purging main pipe (111). The first purging branch pipe (112) is internally connected to the sampling branch pipe (2), and the second purging branch pipe (113) is internally connected to the residual liquid collection container (6) through the purging access end.

6. The sulfonic acid sampling residue recovery device according to claim 5, characterized in that: Both the first purge branch pipe (112) and the second purge branch pipe (113) are connected in series with a shut-off valve (12), and a check valve (9) is also provided on the pipeline between the sampling branch pipe (2) and the shut-off valve (12) on the first purge branch pipe (112).

7. The sulfonic acid sampling residue recovery device according to claim 6, characterized in that: The residual liquid collection container (6) is equipped with a liquid level detector (14) for real-time acquisition of the liquid level height signal in the residual liquid collection container (6); The device also includes a control unit, which is electrically connected to the liquid level detector (14) and the reflux power assembly, respectively, and is used to control the operation or shutdown of the reflux power assembly.

8. The sulfonic acid sampling residue recovery device according to claim 7, characterized in that: The control unit is also connected in communication with the shut-off valve (12) on the purging mechanism (11) for pneumatic cleaning and purging replacement of the inside of the sampling branch pipe (2) and the residual liquid collection tank (6).

9. A sulfonic acid sampling residue recovery device according to any one of claims 1-8, characterized in that: The outer wall of the residual liquid drainage channel (5) and / or the return pipeline (7) is wrapped with a heat tracing structure (15).

10. A sulfonic acid sampling residue recovery device according to claim 9, characterized in that: The heat tracing structure (15) is a heating jacket or electric heat tracing tape wrapped around the outside of the pipe wall. The heat tracing structure (15) maintains the physical properties of the sulfonic acid fluid inside the pipe through heat conduction.

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