Oleylamine separation system
By monitoring the oil-amine interface through an oil-amine separation system, the problem of amine liquid not being able to be recovered during the oil conversion in diesel hydrotreating units has been solved, enabling the recovery and reuse of amine liquid and reducing production and wastewater treatment costs.
Patent Information
- Application Number
- CN202422849299.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-21
AI Technical Summary
When the diesel hydrotreating unit switches to diesel, the amine liquid enters the safety vent tank along with the waste oil. The amine liquid cannot be recovered, resulting in waste, affecting the desulfurization effect and increasing costs. At the same time, the cost of wastewater treatment also increases.
Design an oil-amine separation system that monitors the oil-amine interface using an oil-amine separation tank and an interface level gauge, separates amine liquid and waste oil in a safety venting tank, allows the amine liquid to be recycled into an underground solvent tank, and discharges the waste oil, thus realizing the recycling of amine liquid.
This enables the recycling and reuse of amine liquid, reduces production costs, and avoids the environmental impact and increased costs caused by discharging amine liquid into sewage treatment plants along with waste oil.
Smart Images
Figure CN223516951U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to amine liquid separation recovery technical field, specifically is a kind of oleylamine separation system. BACKGROUND
[0002] The on-site liquid level meter of circulating hydrogen desulfurization tower, low gas desulfurization tower and hydrogenation rich liquid flash tank of diesel oil hydrocracking unit is magnetic flap liquid level meter, and oil level cannot be monitored when oil is transferred, which can easily lead to part of amine liquid being transferred to safety blowdown tank;Low gas amine liquid recovery device and on-site glass plate liquid level meter of regenerated rich liquid flash tank, when oil is transferred, amine liquid is carried to safety blowdown tank with dirty oil, and the glass plate of safety blowdown tank cannot monitor the actual oil-amine interface.In the process of system operation, the following problems exist:1. Amine liquid cannot be recycled in safety blowdown tank, causing waste of amine liquid and increase of regeneration desulfurization cost;2. The total amount of amine liquid decreases, and the concentration of amine liquid decreases, which can easily cause the desulfurization effect to decrease;3. Amine liquid is transferred to tank farm with dirty oil, causing increase of dirty oil recycling cost;4. Amine liquid is discharged into sewage treatment plant with dirty water in dirty oil tank, and amine causes ammonia nitrogen in tank farm sewage to exceed standard, which can impact sewage treatment plant, increase sewage treatment cost and affect the environment. CONTENT OF UTILITY MODEL
[0003] The utility model discloses to solve the problem that amine liquid is transferred to safety blowdown tank with dirty oil when oil is transferred in diesel oil hydrocracking unit, and amine liquid cannot be recycled to cause waste, and provides an oil-amine separation system capable of recycling amine liquid in safety blowdown tank.
[0004] To solve the above technical problems, the utility model discloses liquid blowdown pipeline connected with the oil transfer pipeline of diesel oil hydrocracking unit, the liquid blowdown pipeline is connected with safety blowdown tank, the bottom of safety blowdown tank is connected with bottom liquid discharge pipe, the bottom liquid discharge pipe is connected with dirty oil discharge pipe that discharges dirty oil in safety blowdown tank, and its structural characteristics are as follows: the bottom liquid discharge pipe is connected with oil-amine separation tank, the oil-amine separation tank is equipped with interface level meter for monitoring oil-amine interface, the bottom liquid discharge pipe and dirty oil discharge pipe are respectively equipped with control valve for controlling liquid discharged from bottom liquid discharge pipe to enter oil-amine separation tank or discharge through dirty oil discharge pipe, the bottom of oil-amine separation tank is communicated with underground solvent tank through amine liquid discharge pipe, the amine liquid discharge pipe is equipped with control valve, and the underground solvent tank is communicated with lean liquid buffer tank through pipeline.
[0005] After the equipment in the diesel hydro-upgrading device is switched (i.e. oil is discharged), the dirty oil in the equipment flows to the liquid venting pipeline through the switching pipeline, and then enters the safety venting tank. When the equipment is switched, the amine solution is brought into the safety venting tank. The oil and the amine solution are not miscible, and the density of the amine solution is greater than that of the oil. The dirty oil and the amine solution are stratified in the safety venting tank, the amine solution is in the lower layer, and the dirty oil is in the upper layer. Since the safety venting tank cannot monitor the actual oil-amine interface, when the liquid stored in the safety venting tank reaches a certain amount, the control valve on the bottom liquid discharge pipe is opened, and the control valve on the dirty oil discharge pipe is closed, so that the amine solution at the bottom of the safety venting tank flows into the oil-amine separation tank. The oil-amine interface is observed through the interface meter on the oil-amine separation tank. When the amine solution begins to enter the oil-amine separation tank, the oil-amine interface rises. When the oil-amine interface reaches a certain height, the control valve on the amine solution discharge pipe is opened, and the amine solution flows into the underground solvent tank through the amine solution discharge pipe. The flow rate of the amine solution entering and discharging from the oil-amine separation tank is controlled to be equivalent, so that the oil-amine interface in the oil-amine separation tank is kept stable. When the amine solution in the safety venting tank is discharged, the oil-amine interface in the oil-amine separation tank begins to descend, and almost all the dirty oil is left in the safety venting tank. The control valve on the bottom liquid discharge pipe is closed, and the control valve on the dirty oil discharge pipe is opened, so that the dirty oil in the safety venting tank is discharged through the dirty oil discharge pipe and no longer enters the oil-amine separation tank. When the oil-amine interface in the oil-amine separation tank descends to a certain position, the control valve on the amine solution discharge pipe is closed, and the discharge of the amine solution into the underground solvent tank is stopped. The amine solution in the underground solvent tank is discharged into the lean liquid buffer tank through the pipeline for reuse. When the dirty oil in the safety venting tank is discharged, the control valve on the dirty oil discharge pipe is closed. When the dirty oil in the safety venting tank reaches a certain amount, the above operation is repeated, and the amine solution is separated and recovered. The amine solution in the safety venting tank is discharged into the oil liquid separation tank, the oil liquid separation tank is provided with an interface meter, whether the amine solution in the safety venting tank is discharged is determined through the interface meter, the dirty oil in the safety venting tank is discharged after the amine solution is discharged, the dirty oil in the oil-amine separation tank is prevented from entering the underground solvent tank and the lean liquid buffer tank through the interface meter, and the recycling of the amine solution is realized.
[0006] The top of the safety venting tank is communicated with the top of the oil-amine separation tank through a gas phase equilibrium pipe.
[0007] A dirty oil delivery pump for extracting the dirty oil in the safety venting tank is arranged on the dirty oil discharge pipe.
[0008] An amine solution delivery pipe for discharging the amine solution in the underground solvent tank is connected to the underground solvent tank, and an underground solvent pump for extracting the amine solution in the underground solvent tank is arranged on the amine solution delivery pipe.
[0009] The outlet end of the amine liquid conveying pipe is connected with a first amine liquid branch pipe and a second amine liquid branch pipe, the first amine liquid branch pipe and the second amine liquid branch pipe are both connected to a lean liquid buffer tank, and control valves for controlling amine liquid to enter the first amine liquid branch pipe or the second amine liquid branch pipe are respectively arranged on the first amine liquid branch pipe and the second amine liquid branch pipe, and the second amine liquid branch pipe is connected to a solvent regeneration system for processing amine liquid.
[0010] The liquid venting pipeline is connected with a circulating hydrogen desulfurization tower, a low fraction gas desulfurization tower, a hydrogen-rich liquid flash tank, a low fraction gas amine liquid recovery device and a regenerated rich liquid flash tank through transfer pipelines.
[0011] In the system, the contaminated oil and the amine liquid are layered in the safety venting tank, the amine liquid is in the lower layer and the contaminated oil is in the upper layer, the amine liquid in the safety venting tank is first discharged into the oil-amine separation tank, whether the amine liquid in the safety venting tank is completely discharged is determined by the interface meter on the oil-amine separation tank, when the amine liquid in the safety venting tank is completely discharged, the liquid in the safety venting tank stops entering the oil-amine separation tank, the contaminated oil in the safety venting tank is pumped out by the contaminated oil delivery pump, the amine liquid in the oil-amine separation tank is first discharged into the underground solvent tank and then stored and recovered in the lean liquid buffer tank, the interface meter prevents the contaminated oil in the oil-amine separation tank from being discharged into the underground solvent tank, the amine liquid in the underground solvent tank can be directly sent into the lean liquid buffer tank when the amine liquid in the underground solvent tank meets the reuse requirements, and when the sulfur content in the amine liquid is too high, the amine liquid in the underground solvent tank is first treated by the solvent regeneration system and then sent into the lean liquid buffer tank. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is a structural schematic view of the utility model;
[0013] Figure 2 It is a schematic view of a contaminated oil treatment system in an existing safety venting tank;
[0014] In the drawing: 1, liquid venting pipeline; 2, safety venting tank; 21, bottom liquid discharge pipe; 211, contaminated oil discharge pipe; 212, contaminated oil delivery pump; 3, oil-amine separation tank; 31, amine liquid discharge pipe; 32, gas phase balance pipe; 4, underground solvent tank; 41, amine liquid conveying pipe; 411, underground solvent pump; 412, first amine liquid branch pipe; 413, second amine liquid branch pipe; 414, solvent regeneration system; 5, lean liquid buffer tank; 100, circulating hydrogen desulfurization tower; 101, first transfer pipeline; 200, low fraction gas desulfurization tower; 201, second transfer pipeline; 300, hydrogen-rich liquid flash tank; 301, third transfer pipeline; 400, low fraction gas amine liquid recovery device; 401, fourth transfer pipeline; 500, regenerated rich liquid flash tank; 501, fifth transfer pipeline. DETAILED DESCRIPTION
[0015] Figure 2The system in the prior art for treating waste oil in the safety blowdown tank 2 is shown in the figure, which includes a liquid blowdown pipeline 1 connected with the transfer pipeline of the diesel hydro-upgrading device, the liquid blowdown pipeline 1 is connected with the safety blowdown tank 2, Figure 2 The circulating hydrogen desulfurization tower 100 is provided with a first transfer pipeline 101, the low-gas desulfurization tower 200 is provided with a second transfer pipeline 201, the hydrogen-rich liquid flash tank 300 is provided with a third transfer pipeline 301, the low-gas amine liquid recovery device 400 is provided with a fourth transfer pipeline 401, and the regenerated hydrogen-rich liquid flash tank 500 is provided with a fifth transfer pipeline 501. The first transfer pipeline 101, the second transfer pipeline 201, the third transfer pipeline 301, the fourth transfer pipeline 401 and the fifth transfer pipeline 501 are all connected with the liquid blowdown pipeline 1. The waste oil discharged from the circulating hydrogen desulfurization tower 100, the low-gas desulfurization tower 200, the hydrogen-rich liquid flash tank 300, the low-gas amine liquid recovery device 400 and the regenerated hydrogen-rich liquid flash tank 500 enters the liquid blowdown pipeline 1 through the transfer pipelines, and then enters the safety blowdown tank 2. The bottom of the safety blowdown tank 2 is provided with a bottom liquid discharge pipeline 21 for discharging the liquid in the tank. The bottom liquid discharge pipeline 21 is provided with a control valve, and is connected with a waste oil discharge pipeline 211. The waste oil discharge pipeline 211 is provided with a waste oil delivery pump 212 for pumping the waste oil in the safety blowdown tank 2. After the waste oil is discharged from the safety blowdown tank 2, it enters a waste oil tank (not shown in the figure) in the tank area. The waste oil is recycled, and the water in the waste oil tank is discharged into a sewage treatment plant for treatment. Figure 2 The system in the prior art has the following problems in operation. The on-site liquid level meter of the circulating hydrogen desulfurization tower 100, the low-gas desulfurization tower 200 and the hydrogen-rich liquid flash tank 300 is a magnetic reed liquid level meter, and the oil level cannot be monitored during the transfer, which easily leads to the transfer of part of the amine liquid to the safety blowdown tank 2. The on-site liquid level meter of the low-gas amine liquid recovery device 400 and the regenerated hydrogen-rich liquid flash tank 500 is a glass plate liquid level meter. During the transfer, the waste oil carries the amine liquid to the safety blowdown tank 2, and the waste oil in the safety blowdown tank 2 contains the amine liquid. The amine liquid is not recycled and is discharged into the waste oil tank in the tank area with the waste oil, which causes the following problems: waste of amine liquid, increase of the cost of regenerative desulfurization; decrease of the total amount of amine liquid in the system and decrease of the concentration of the amine liquid, which leads to the decrease of the desulfurization effect; increase of the cost of waste oil recycling due to the transfer of the amine liquid to the waste oil tank in the tank area; and the amine liquid in the waste oil tank is discharged into the sewage treatment plant with the sewage in the tank, which leads to the ammonia nitrogen in the sewage in the tank area exceeding the standard, impacts the sewage treatment plant, affects the normal operation of the sewage treatment plant, and increases the operation cost of the sewage treatment plant.
[0016] Reference Figure 1The utility model discloses an oil amine separation system, including the liquid emptying pipeline 1 who is connected with the oil transfer pipeline of diesel oil hydrogenation modification device, liquid emptying pipeline 1 is connected with safe emptying tank 2, specifically, liquid emptying pipeline 1 is connected with circulating hydrogen desulfurization tower 100, low gas desulfurization tower 200, hydrogenation rich liquid flash tank 300, low gas amine liquid recovery ware 400, regenerative rich liquid flash tank 500 through first oil transfer pipeline 101, second oil transfer pipeline 201, third oil transfer pipeline 301, fourth oil transfer pipeline 401, fifth oil transfer pipeline 501 respectively, liquid emptying pipeline 1 collects the dirty oil that circulating hydrogen desulfurization tower 100, low gas desulfurization tower 200, hydrogenation rich liquid flash tank 300, low gas amine liquid recovery ware 400, regenerative rich liquid flash tank 500 are discharged when transferring, then the dirty oil is discharged into safe emptying tank 2, the bottom of safe emptying tank 2 is equipped with bottom liquid discharge pipe 21, bottom liquid discharge pipe 21 is connected with the dirty oil external discharge pipe 211 that the dirty oil in safe emptying tank 2 is discharged to tank area dirty oil tank (not shown in the drawing), bottom liquid discharge pipe 21 is connected to the top of oil amine separation tank 3, bottom liquid discharge pipe 21 and dirty oil external discharge pipe 211 all are equipped with control valve, the liquid that safe emptying tank 2 is discharged enters oil amine separation tank 3 or is discharged through dirty oil external discharge pipe 211 through the control valve on bottom liquid discharge pipe 21 and dirty oil external discharge pipe 211, is equipped with boundary level meter (not shown in the drawing) for monitoring oil amine demarcation surface on oil amine separation tank 3;The bottom of oil amine separation tank 3 is communicated with underground solvent tank 4 through amine liquid discharge pipe 31, and the control valve is equipped on amine liquid discharge pipe 31, and underground solvent tank 4 is communicated with lean liquid buffer tank 5 through pipeline, and the amine liquid in oil amine separation tank 3 enters underground solvent tank 4 through amine liquid discharge pipe 31, and then is sent into lean liquid buffer tank 5 and is stored for reuse.The upper portion of oil amine separation tank 3 can be provided with a control valve for discharging the dirty oil in the tank, which is generally not opened. When the upper portion of the oil amine separation tank 3 has accumulated a large amount of dirty oil, the dirty oil is discharged through the control valve. The position of the oil amine separation interface is lower than the height of the oil discharge point during oil discharge.
[0017] Referring to Figure 1 The dirty oil external discharge pipe 211 is provided with a dirty oil external delivery pump 212, which can quickly extract and discharge the dirty oil in the safe emptying tank 2. The underground solvent tank 4 is connected with an amine liquid delivery pipe 41, and the amine liquid delivery pipe 41 is provided with an underground solvent pump 411. The underground solvent pump 411 extracts the amine liquid in the underground solvent tank 4 and sends it into the lean liquid buffer tank 5. The top of the safe emptying tank 2 and the top of the oil amine separation tank 3 are communicated through a gas phase balance pipe 32, so that the pressures of the top spaces of the safe emptying tank 2 and the oil amine separation tank 3 are balanced, and the liquid in the safe emptying tank 2 can flow smoothly into the oil amine separation tank 3.
[0018] Referring to Figure 1The outlet end of the amine liquid conveying pipe 41 is connected with a first amine liquid branch pipe 412 and a second amine liquid branch pipe 413, the first amine liquid branch pipe 412 and the second amine liquid branch pipe 413 are both connected to the lean liquid buffer tank 5, the first amine liquid branch pipe 412 and the second amine liquid branch pipe 413 are respectively provided with control valves for controlling the amine liquid to enter the first amine liquid branch pipe 412 or the second amine liquid branch pipe 413, the second amine liquid branch pipe 413 is connected with a solvent regeneration system 414 for treating the amine liquid, the amine liquid generally adopts MDEA, the amine liquid contains a certain amount of sulfur, the main equipment of the solvent regeneration system 414 is a solvent regeneration tower, the rich liquid enters the solvent regeneration tower and is regenerated by stripping to contain the sulfur, the regenerated amine liquid enters the lean liquid buffer tank 5 through the second amine liquid branch pipe 413, the solvent regeneration system 414 can directly use the existing device in a petrochemical enterprise, the structure and principle are prior art, and will not be described in detail here; when the amine liquid in the underground solvent tank 4 contains low sulfur, the amine liquid can be directly sent to the lean liquid buffer tank 5 through the first amine liquid branch pipe 412, and when the amine liquid contains high sulfur, the amine liquid is treated and regenerated by the solvent regeneration system 414 on the second amine liquid branch pipe 413 and then enters the lean liquid buffer tank 5.
[0019] It should be noted that: other instruments, valves, inspection openings, sampling openings and the like accessories are also arranged on the actual tank body, other pumps, valves, detection meters and other accessories are also arranged on the pipeline, which belongs to the conventional setting in the field, and are not shown in the drawings or the text. The circulating hydrogen desulfurization tower 100, the low fraction gas desulfurization tower 200, the hydrogen-rich liquid flash tank 300, the low fraction gas amine liquid recovery device 400 and the regenerated rich liquid flash tank 500 in the utility model are equipment of a diesel oil hydro-upgrading device, the oil transfer is a discharge process after equipment operation, the safety venting tank 2 and the oil amine separation tank 3 can only have a certain capacity and can separate oil and amine, the underground solvent tank 4 and the lean liquid buffer tank 5 have a certain capacity, the solvent regeneration system 414 can adopt an existing device, and the contaminated oil tank in the tank area is an existing device.
[0020] Working principle: when the circulating hydrogen desulfurization tower 100, low gas desulfurization tower 200, hydrogenation rich liquid flash tank 300, low gas amine liquid recovery device 400, and regenerated rich liquid flash tank 500 of the diesel hydrogenation modification device are turned over, the dirty oil is discharged into the safety vent tank 2, and part of the amine liquid is brought into the safety vent tank 2. Since the oil and the amine liquid are not miscible, and the density of the amine liquid is greater than that of the oil, the dirty oil and the amine liquid are stratified in the safety vent tank 2, the amine liquid is in the lower layer, and the dirty oil is in the upper layer. When the amount of dirty oil in the safety vent tank 2 reaches a certain amount, the oil and amine are stratified in the tank, the control valve on the bottom liquid discharge pipe 21 is opened, the control valve on the dirty oil discharge pipe 211 is closed, the amine liquid at the bottom of the safety vent tank 2 is discharged into the oil and amine separation tank 3, the oil and amine interface in the oil and amine separation tank 3 is raised, the oil and amine interface in the oil and amine separation tank 3 is monitored by the interface meter, when the oil and amine interface reaches a certain height, the control valve on the amine liquid discharge pipe 31 is opened, the amine liquid in the oil and amine separation tank 3 is discharged from the bottom into the underground solvent tank 4, the flow rate of the amine liquid discharged from the oil and amine separation tank 3 is controlled to be equivalent to the flow rate of the amine liquid entering, so that the oil and amine interface in the oil and amine separation tank 3 is kept stable, when the amine liquid at the bottom of the safety vent tank 2 is discharged, the oil and amine interface in the oil and amine separation tank 3 begins to drop, at this time the control valve on the bottom liquid discharge pipe 21 is closed, the control valve on the dirty oil discharge pipe 211 is opened, the dirty oil in the safety vent tank 2 is pumped to the tank area dirty oil tank by the dirty oil delivery pump 212, after the dirty oil is discharged, the control valves on the dirty oil delivery pump 212 and the dirty oil discharge pipe 211 are closed, the amine liquid in the oil and amine separation tank 3 continues to be discharged into the underground solvent tank 4, when the oil and amine interface in the oil and amine separation tank 3 drops to a certain position, the control valve on the amine liquid discharge pipe 31 is closed, to prevent the dirty oil in the oil and amine separation tank 3 from entering the underground solvent tank 4, the dirty oil discharge pipe 211, the bottom liquid discharge pipe 21, and the amine liquid discharge pipe 31 can be manually controlled or electrically controlled, when electrically controlled, a controller is provided, the controller controls the opening and closing and opening degree of the control valve according to the interface meter and the liquid level meter on the safety vent tank 2 (not shown in the figure); if the volume of the oil and amine separation tank 3 is large enough, the control valve on the amine liquid discharge pipe 31 is closed when the amine liquid is discharged into the oil and amine separation tank 3, the oil and amine interface in the tank is raised, when the oil and amine interface no longer rises, it can be determined that the amine liquid at the bottom of the safety vent tank 2 is discharged. The sulfur content of the amine liquid in the underground solvent tank 4 is analyzed, if the sulfur content of the amine liquid is low, the amine liquid in the underground solvent tank 4 is pumped out by the underground solvent pump 411 and directly sent to the lean liquid buffer tank 5 through the first amine liquid branch pipe 412, if the sulfur content of the amine liquid is high, the amine liquid in the underground solvent tank 4 is pumped out by the underground solvent pump 411 and sent to the second amine liquid branch pipe 413, then the amine liquid is regenerated by the solvent regeneration system 414 and sent to the lean liquid buffer tank 5, the recovered amine liquid is temporarily stored in the lean liquid buffer tank 5 and reused in the desulfurization tower and other devices.
[0021] The oil amine separation system, the dirty oil discharged by the diesel hydrogen modified device enters the safety venting tank, the amine liquid is discharged into the oil amine separation tank after being layered in the safety venting tank, whether the amine liquid in the safety venting tank is discharged completely is judged according to the oil amine separation interface monitored by the oil amine separation tank boundary level meter, when the amine liquid in the safety venting tank is discharged completely, the remaining dirty oil in the tank, the amine liquid is stopped from being discharged into the oil amine separation tank, the dirty oil in the safety venting tank is discharged, the amine liquid in the oil amine separation tank is discharged into the underground solvent tank, and then is directly sent or is sent into the lean liquid buffer tank after being regenerated by the solvent regeneration system for storage and reuse. The oil amine separation system realizes the recycling of the amine liquid taken out with the dirty oil during the oil discharge of the diesel hydrogen modified device, saves the production cost, and reduces the impact on sewage treatment when the amine liquid enters the sewage treatment plant.
Claims
1. An oleylamine separation system comprising a liquid vent line (1) connected to a transfer line of a diesel hydro-upgrading device, the liquid vent line (1) being connected to a safety vent tank (2), a bottom liquid discharge pipe (21) being connected to a bottom of the safety vent tank (2), and a dirty oil discharge pipe (211) being connected to the bottom liquid discharge pipe (21) for discharging dirty oil in the safety vent tank (2) to outside, characterized in that: The bottom liquid discharge pipe (21) is connected with the oleylamine separation tank (3), the oleylamine separation tank (3) is provided with a interface meter for monitoring the oleylamine interface, the bottom liquid discharge pipe (21) and the waste oil discharge pipe (211) are respectively provided with control valves for controlling the liquid discharged from the bottom liquid discharge pipe (21) to enter the oleylamine separation tank (3) or to be discharged through the waste oil discharge pipe (211), the bottom of the oleylamine separation tank (3) is communicated with the underground solvent tank (4) through an amine liquid discharge pipe (31), the amine liquid discharge pipe (31) is provided with a control valve, and the underground solvent tank (4) is communicated with the lean liquid buffer tank (5) through a pipeline.
2. The oleylamine separation system of claim 1, wherein: The top of the safety vent tank (2) is communicated with the top of the oleylamine separation tank (3) through a gas phase equilibrium pipe (32).
3. The oleylamine separation system of claim 1, wherein: The waste oil discharge pipe (211) is provided with a waste oil delivery pump (212) for pumping the waste oil in the safety vent tank (2).
4. The oleylamine separation system of claim 1, wherein: The underground solvent tank (4) is connected with an amine liquid delivery pipe (41) for discharging the amine liquid in the tank, and the amine liquid delivery pipe (41) is provided with an underground solvent pump (411) for pumping the amine liquid in the underground solvent tank (4).
5. The oleylamine separation system of claim 4, wherein: The outlet end of the amine liquid delivery pipe (41) is connected with a first amine liquid branch pipe (412) and a second amine liquid branch pipe (413), the first amine liquid branch pipe (412) and the second amine liquid branch pipe (413) are connected to the lean liquid buffer tank (5), and the first amine liquid branch pipe (412) and the second amine liquid branch pipe (413) are respectively provided with control valves for controlling the amine liquid to enter the first amine liquid branch pipe (412) or the second amine liquid branch pipe (413), and the second amine liquid branch pipe (413) is connected with a solvent regeneration system (414) for treating the amine liquid.
6. The oleylamine separation system of claim 1, wherein: The liquid venting pipeline (1) is connected with the circulating hydrogen desulfurization tower (100), the low-temperature gas desulfurization tower (200), the hydrogen-rich liquid flash tank (300), the low-temperature gas amine liquid recovery device (400) and the regenerated liquid flash tank (500) through the oil transfer pipeline.