A dechlorination device and dechlorination method for hydrogenation of waste lubricating oil vacuum distillation fraction oil

Abstract

The invention discloses a dechlorination device for hydrogenation of waste lubricating oil vacuum distillate oil in the technical field of waste lubricating oil treatment, comprising: a rotary disc extraction tower, a light liquid outlet of the rotary disc extraction tower is connected with a sedimentation tank through a conduit, the sedimentation tank is connected with a flash tower through a delivery pump, and an installation box is arranged on the sedimentation tank; a moving part is slidably arranged in the installation box, a feed pipe extending into the sedimentation tank is arranged on the moving part, and a flexible pipe is arranged in the installation box respectively connected with the feed pipe inlet and the conduit outlet; a detection mechanism connected with the moving part is arranged on the installation box, and in the present application, when the liquid level inside the sedimentation tank rises, the moving block inside the pipe part will also move upward, and will move upward with the moving part and the feed pipe, so that a small distance is always maintained between the bottom end of the feed pipe and the bottom of the inner cavity of the sedimentation tank or the liquid level inside the sedimentation tank, so as to avoid its splashing to various areas inside the sedimentation tank and avoid increasing the sedimentation time.

Description

Technical Field

[0001] The invention relates to the technical field of waste lubricating oil treatment, in particular to a dechlorination device and a dechlorination method for hydrogenation of waste lubricating oil vacuum distillation fraction oil. Background Art

[0002] Lubricating oil is composed of base oil and a certain amount of additives. After a period of use, lubricating oil will lose its normal function due to the introduction of impurities, deterioration of additives, etc., and become waste lubricating oil. In order to save resources, waste lubricating oil will be recycled.

[0003] Waste lubricating oil is distilled under reduced pressure to obtain distillate oil. Before the distillate oil is hydrogenated, it is necessary to dechlorinate the distillate oil first. Generally, a dechlorinating agent is added to the distillate oil for treatment to remove the chlorine component contained in the distillate oil. The treated distillate oil will enter the container for sedimentation. However, the treated distillate oil will have a certain height when entering the container (there is a certain distance between the feed port and the bottom of the container), which will cause the distillate oil to splash when it falls to the bottom of the container. In addition, the feed port is generally located above the container and does not extend to the inside of the container, causing the distillate oil to disperse as soon as it enters the container. When splashing occurs, a large number of distillate oil droplets will adhere to the container wall. When sedimentation begins, distillate oil droplets will slowly fall from the container wall, resulting in an increase in the sedimentation time of the distillate oil. Summary of the invention

[0004] The object of the present invention is to provide a dechlorination device and a dechlorination method for hydrogenation of distillate oil from vacuum distillation of waste lubricating oil, so as to solve the problem that the treated distillate oil proposed in the above background technology will have a certain height when entering the container, which will cause the distillate oil to splash when it falls to the bottom of the container, and when it starts to settle, there will be distillate oil drops on the container wall slowly falling, resulting in an increase in the settling time of the distillate oil.

[0005] To achieve the above object, the present invention provides the following technical solution: a dechlorination device for hydrogenation of waste lubricating oil vacuum distillation fraction, comprising: a rotary disc extraction tower, the light liquid outlet of the rotary disc extraction tower is connected to a settling tank through a conduit, the settling tank is connected to a flash tower through a delivery pump, and the dechlorination device further comprises: an installation box arranged on the settling tank;

[0006] A moving part is slidably arranged in the installation box, a feed pipe extending into the settling tank is arranged on the moving part, and a flexible pipe is arranged in the installation box which is respectively connected with the feed pipe inlet and the conduit outlet;

[0007] The installation box is provided with a detection mechanism connected to the moving part to detect the liquid level height inside the sedimentation tank. The liquid level height is used to drive the moving part to move, change the depth of the feed pipe inside the sedimentation tank, and make the height of the feed pipe rise synchronously with the liquid level height inside the sedimentation tank.

[0008] Preferably, the detection mechanism comprises a pipe extending into the sedimentation tank, a moving block for sealing and dividing the inside of the pipe is slidably provided in the pipe, and a moving rod connected to the moving block is provided on the moving member.

[0009] Preferably, a working box is provided on the installation box, a moving plate for sealing and dividing the working box into two cavities and an elastic element connected to the moving plate are slidably provided in the working box, one side of the cavity is filled with water, a heat conducting member extending into the sedimentation tank is provided in the water, and a pull rope is provided between the moving plate and the moving block;

[0010] Wherein, the side wall of the heat conducting component is wrapped with a heat insulating layer.

[0011] Preferably, the outer side of the conduit is wrapped with a heat insulation kit, and a circulation pipeline wrapped around the outer side of the conduit is provided in the heat insulation kit, and the inlet and outlet of the circulation pipeline are respectively connected to the pump and the water storage mechanism, and the pump is connected to the water storage mechanism;

[0012] Wherein, the circulation pipeline passes through the flash tower and the water in the working box.

[0013] Preferably, a sleeve is provided on the outer side of the feed pipe, the sleeve is a flexible sleeve, and an elastic member is provided between the sleeve and the feed pipe.

[0014] Preferably, the movable part is provided with an installation groove body, the installation groove body is slidably provided with a guide member and a spring member connected to the guide member, a connecting rope is provided between the guide member and the sleeve, the installation box is provided with a connecting box connected to the sedimentation tank, the connecting box is slidably provided with a block for sealing the connecting area between the connecting box and the sedimentation tank, and a linkage rope is provided between the block and the guide member.

[0015] Preferably, an arc-shaped baffle and a flexible barrier are provided at the outlet end of the feed pipe, the baffle and the flexible barrier form an annular member, and a connecting member slides on the baffle, moves along the arc-shaped edge of the baffle and is connected to the flexible barrier.

[0016] Preferably, a dechlorination method for hydrogenation of waste lubricating oil vacuum distillation distillate oil, using a dechlorination device for hydrogenation of waste lubricating oil vacuum distillation distillate oil, specifically comprises the following steps:

[0017] S1: After adding the dechlorinating agent and the distillate oil from the heavy liquid inlet and the light liquid inlet of the rotary disc extraction tower respectively, the rotary disc extraction tower is operated to make the two mixed and reacted to remove the chlorine component in the distillate oil;

[0018] S2: The salt and the oil with a higher density produced by the reaction fall to the bottom of the rotary disc extraction tower and are discharged from the bottom thereof. The distillate oil without chlorine components is discharged from the light liquid outlet of the rotary disc extraction tower, enters the conduit, and then enters the settling tank through the flexible pipe and the feed pipe;

[0019] S3: The detection mechanism detects the liquid level inside the sedimentation tank. As the liquid level gradually rises, it drives the moving part to move upward, causing the feed pipe to move upward;

[0020] S4: After the treated distillate oil completely enters the settling tank, it is allowed to stand to allow the treated distillate oil to settle in the settling tank, and then it is input into the flash tower for treatment to remove the mixture contained therein.

[0021] Preferably, a method for preparing a dechlorinating agent for hydrogenation of waste lubricating oil vacuum distillation distillate oil is applied to a dechlorination method for hydrogenation of waste lubricating oil vacuum distillation distillate oil, which specifically comprises the following steps:

[0022] Preferably, the preparation method of the dechlorinating agent in step S1 is to mix 6-4 parts of propylene glycol with 4-6 parts of sodium hydroxide, and heat and stir to obtain the dechlorinating agent.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: in the present application, when the liquid level inside the settling tank rises, the moving block inside the pipe will also move upward, and will move the moving block and the feed pipe upward, so that a small distance is always maintained between the bottom end of the feed pipe and the bottom of the inner cavity of the settling tank or the liquid surface inside the settling tank, and the treated distillate oil falls to the bottom of the inner cavity of the settling tank or the liquid surface inside the settling tank as soon as it exits the feed pipe, thereby reducing the probability of dispersion after discharge, reducing the amplitude of its dispersion, and reducing the impact caused by its fall, avoiding its splashing to various areas inside the settling tank, and avoiding increasing the sedimentation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the connection structure between the installation box and the moving part of the present invention;

[0026] Figure 3 This is an enlarged schematic diagram of the structure at A of the present invention;

[0027] Figure 4 This is a schematic diagram of the connection structure between the feed pipe and the sleeve of the present invention;

[0028] Figure 5 It is a schematic diagram of the connection structure between the baffle and the flexible blocking member of the present invention.

[0029] In the figure: 1. Rotary disc extraction tower; 2. Sedimentation tank; 3. Flash tower; 4. Installation box; 5. Moving parts; 6. Feed pipe; 7. Flexible pipe; 8. Pipe fittings; 9. Moving rod; 10. Casing; 11. Baffle; 12. Connecting rope; 13. Installation tank; 14. Connecting box; 15. Moving block; 16. Working box; 17. Moving plate; 18. Pull rope; 19. Heat conducting part; 20. Circulation pipe; 21. Pump; 22. Elastic part; 23. Connecting part; 24. Flexible blocking part. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1 and Figure 2 A dechlorination device for hydrogenation of waste lubricating oil vacuum distillation distillate oil comprises: a rotary disc extraction tower 1, a settling tank 2 and a flash tower 3; a light liquid outlet of the rotary disc extraction tower 1 is connected with a conduit, and a mounting box 4 is mounted on the settling tank 2; a moving part 5 is slidably mounted in the mounting box 4, and a feed pipe 6 is mounted on the moving part 5, and an end of the feed pipe 6 away from the moving part 5 extends to the inside of the settling tank 2, and the length of the feed pipe 6 inside the settling tank 2 can be changed by moving the moving part 5 inside the mounting box 4; the mounting box 4 A flexible tube 7 is provided inside (the inside of the flexible tube 7 is coated with a heat-insulating coating, and the flexible tube 7 is bent inside the installation box 4, that is, the length of the flexible tube 7 is sufficient to move the movable part 5. When the feed pipe 6 is moved into the settling tank 2, the flexible tube 7 can compensate and will not affect the feed pipe 6 entering the settling tank 2). The two ends of the flexible tube 7 are respectively connected to the conduit outlet and the inlet of the feed pipe 6, so that the conduit is connected to the feed pipe 6; the outlet of the settling tank 2 is connected to the delivery pump, and the outlet of the delivery pump is connected to the flash tower 3.

[0033] See also Figure 2 and Figure 3 , a detection mechanism connected to the moving part 5 is provided on the installation box 4;

[0034] Among them, the detection mechanism includes a pipe fitting 8 installed on the installation box 4, and the pipe fitting 8 is inside the sedimentation tank 2 (the end of the pipe fitting 8 away from the installation box 4 does not contact the inner wall of the sedimentation tank 2, so as to avoid the inlet of the pipe fitting 8 being blocked; when the end of the pipe fitting 8 away from the installation box 4 contacts the inside of the sedimentation tank 2, a feed port is opened on the side wall of the pipe fitting 8, so that the distillate oil inside the sedimentation tank 2 can enter the inside of the pipe fitting 8); a moving block 15 is slidably provided inside the pipe fitting 8, and the moving block 15 seals and divides the inside of the pipe fitting 8 into two parts, and a moving rod 9 is installed between the moving block 15 and the moving member 5.

[0035] It should be noted that when the treated distillate oil begins to be added to the interior of the settling tank 2 (when the treated distillate oil just begins to enter the interior of the settling tank 2, the bottom end of the feed pipe 6 is closer to the bottom of the inner cavity of the settling tank 2, that is, the feed pipe 6 extends more into the interior of the settling tank 2, so that the distance between the two is smaller, so that the treated distillate oil falls to the bottom of the inner cavity of the settling tank 2 as soon as it leaves the feed pipe 6, so that the probability of dispersion after discharge is reduced, and the amplitude of dispersion is reduced, and at the same time, the distance the treated distillate oil falls is also reduced, and the impact force generated by its fall is reduced, so that it is prevented from splashing to various areas inside the settling tank 2, and the The detection mechanism detects the liquid level height inside the settling tank 2; the treated distillate oil inside the settling tank 2 enters the pipe 8, and when the liquid level inside the settling tank 2 rises, the moving block 15 inside the pipe 8 also moves upward, and moves the moving member 5 and the feed pipe 6 upward, so that a small distance (no contact) is always maintained between the bottom end of the feed pipe 6 and the liquid level inside the settling tank 2; thereby, the treated distillate oil does not splash when it enters the settling tank 2, so as to avoid increasing the settling time and improve the efficiency of distillate oil dechlorination.

[0036] Example 2

[0037] For further optimization, see Figure 2 and Figure 3 A working box 16 is provided on the installation box 4, and a movable plate 17 is slidably provided in the working box 16, and an elastic element is installed between the working box 16 and the movable plate 17; the movable plate 17 seals and divides the inner cavity of the working box 16 into two cavities, one side of the cavity is filled with water, and a heat conductor 19 is provided in the water, one end of the heat conductor 19 extends to the interior of the sedimentation tank 2, and the side wall of the heat conductor 19 is wrapped with a heat insulation layer (the heat insulation layer is made of a heat-insulating material and can withstand a certain temperature; the heat conductor 19 refers to a metal heat conductor, such as iron, copper, etc.), and the two ends of the heat conductor 19 are exposed, and the two ends are respectively in contact with the water in the working box 16 and the interior of the sedimentation tank 2 to reduce heat loss; a pull rope 18 is provided between the movable plate 17 and the movable block 15.

[0038] It should be noted that when the treated distillate oil enters the settling tank 2, the temperature inside the settling tank 2 will rise (because the distillate oil and the dechlorinating agent are heated to 200°C and enter the turntable extraction tower for treatment, the treated distillate oil will have a certain temperature after entering the settling tank 2, which will cause the temperature inside the settling tank 2 to rise; and as the liquid level inside the settling tank 2 gradually rises, the temperature inside the settling tank 2 will gradually increase); the heat conducting member 19 receives the temperature change and conducts it to the water in the working box 16, causing the water temperature to rise and expand, driving the movable plate 17 to move, pulling the pull rope 18, and moving the movable block 15 to move, ensuring that as the liquid level inside the settling tank 2 rises, the movable block 15 will move, and move the movable member 5 and the feed pipe 6 upward, so that a smaller distance is always maintained between the outlet end of the feed pipe 6 and the liquid level inside the settling tank 2.

[0039] In this embodiment, as a further optimized solution, please refer to Figure 1 , Figure 2 and Figure 3 , the outer side of the conduit is wrapped with a heat insulation kit (insulation layer, and can withstand high temperatures, such as rock wool material); a circulation pipe 20 is arranged in the heat insulation kit, and the circulation pipe 20 is wrapped around the outer side of the conduit (the conduit and the circulation pipe 20 are both made of metal heat-conducting materials, so that the two can conduct heat, and the circulation pipe 20 is in the external area and an insulation material is arranged, such as a rock wool insulation layer); the inlet and outlet of the circulation pipe 20 are respectively connected to the pump 21 and the water storage mechanism (the water storage mechanism refers to a water storage tank or other water storage facilities), the pump 21 is connected to the water storage mechanism, and the circulation pipe 20 passes through the flash tower 3 and the water in the working box 16; The pump 21 inputs the water of the water storage mechanism into the circulation pipe 20, and circulates in the circulation pipe 20 to absorb the temperature of the treated distillate oil in the conduit, reduce its temperature, and protect the installation box 4 and other components; the water flowing in the circulation pipe 20 will transfer the temperature to the water in the working box 16 (with the increase of time, the temperature of the water inside the circulation pipe 20 will gradually rise), so that the movable plate 17 will move and pull the movable block 15; and the water inside the circulation pipe 20 will also provide the temperature to the flash tower 3, provide a heat source for the operation of the flash tower 3, and achieve an energy saving effect.

[0040] In this embodiment, as a further optimized solution, please refer to Figure 2 and Figure 4A sleeve 10 is sleeved on the outside of the feed pipe 6, and the sleeve 10 is a flexible sleeve (made of rubber and can be bent and deformed). An elastic member 22 is provided between the inside of the sleeve 10 and the outside of the feed pipe 6; when the pressure inside the settling tank 2 increases (due to rising temperature and liquid level), the sleeve 10 can be deformed to reduce the pressure on the feed pipe 6, thereby preventing the feed pipe 6 from deforming due to increased pressure, and preventing the feed pipe 6 from discharging the material too quickly (a discharging speed that is too fast will cause the impact force of the material to be discharged to be too large, and an excessive impact force will cause the material to splash over a large area).

[0041] In this embodiment, as a further optimized solution, please refer to Figure 2 A mounting groove 13 is provided on the movable member 5, a guide member is slidably provided on the mounting groove 13, and a spring member is installed between the mounting groove 13 and the guide member; a connecting rope 12 is provided between the guide member and the sleeve 10; a connecting box 14 connected to the sedimentation tank 2 is provided on the mounting box 4, and a block is slidably provided on the connecting box 14, and the block is used to block the connecting area between the connecting box 14 and the sedimentation tank 2, and a linkage rope is provided between the block and the guide member; when the sleeve 10 is deformed, the connecting rope 12 will be pulled to move the guide member to pull the linkage rope, remove the block from the shielding area, and connect the connecting box 14 with the sedimentation tank 2, so as to relieve the pressure inside the sedimentation tank 2.

[0042] In this embodiment, as a further optimized solution, please refer to Figure 2 and Figure 5 An arc-shaped baffle 11 and a flexible barrier 24 (made of metal) are provided at the outlet end of the feed pipe 6. The baffle 11 and the flexible barrier 24 form an annular member. A connecting member 23 (the connecting member 23 and the flexible barrier 24 are made of the same material) slides on the baffle 11 and moves along the arc edge of the baffle 11 and is connected to the flexible barrier 24. When the internal pressure of the feed pipe 6 is high, the connecting member 23 and the flexible barrier 24 will move to expand the inner diameter of the annular member, thereby reducing the pressure during discharge and avoiding excessive discharge speed and impact force.

[0043] A method for dechlorinating waste lubricating oil vacuum distillation distillate oil by hydrogenation, using a dechlorinating device for hydrogenation of waste lubricating oil vacuum distillation distillate oil, specifically comprising the following steps:

[0044] S1: After adding the dechlorinating agent and the distillate oil from the heavy liquid inlet and the light liquid inlet of the rotary disc extraction tower 1 respectively (the dechlorinating agent and the distillate oil are heated to 200° C.), the rotary disc extraction tower 1 is operated to make the two react with each other to remove the chlorine component in the distillate oil.

[0045] S2: The salt and the heavier oil produced by the reaction fall to the bottom of the rotary disc extraction tower 1 and are discharged from the bottom thereof. The distillate oil from which the chlorine component has been removed is discharged from the light liquid outlet of the rotary disc extraction tower 1, enters the conduit, and then enters the settling tank 2 through the flexible pipe 7 and the feed pipe 6.

[0046] S3: The detection mechanism detects the liquid level inside the settling tank 2. As the liquid level gradually rises, the moving member 5 is driven to move upward, causing the feed pipe 6 to move upward.

[0047] When the liquid level inside the settling tank 2 rises, the moving block 15 inside the pipe 8 will also move upward, bringing the moving part 5 and the feeding pipe 6 upward, so that a small distance is always maintained between the bottom end of the feeding pipe 6 and the liquid level inside the settling tank 2.

[0048] S4: After the treated distillate oil completely enters the settling tank 2, it is left to stand to allow the treated distillate oil to settle in the settling tank 2, and then it is input into the flash tower 3 for treatment to remove the mixture contained therein.

[0049] The preparation method of the dechlorinating agent in step S1 is to mix 6-4 parts of propylene glycol with 4-6 parts of sodium hydroxide, and heat and stir to obtain the dechlorinating agent.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dechlorination device for hydrogenation of waste lubricating oil vacuum distillation fraction, comprising: A rotary disc extraction tower (1), wherein the light liquid outlet of the rotary disc extraction tower (1) is connected to a settling tank (2) via a conduit, and the settling tank (2) is connected to a flash tower (3) via a delivery pump, wherein the dechlorination device further comprises: an installation box (4) arranged on the settling tank (2); A moving part (5) is slidably provided in the installation box (4), a feed pipe (6) extending into the sedimentation tank (2) is provided on the moving part (5), and a flexible pipe (7) is provided in the installation box (4) and is respectively connected to the inlet of the feed pipe (6) and the outlet of the conduit; The installation box (4) is provided with a detection mechanism connected to the moving member (5) to detect the liquid level height inside the settling tank (2). The moving member (5) is driven to move according to the liquid level height, thereby changing the depth of the feed pipe (6) inside the settling tank (2), so that the height of the feed pipe (6) rises synchronously with the liquid level height inside the settling tank (2); The detection mechanism comprises a pipe (8) extending into the sedimentation tank (2), a moving block (15) for sealing and dividing the inside of the pipe (8) being slidably provided inside the pipe (8), and a moving rod (9) connected to the moving block (15) being provided on the moving member (5); A working box (16) is provided on the installation box (4), a moving plate (17) for sealingly dividing the working box (16) into two cavities and an elastic element connected to the moving plate (17) are slidably provided in the working box (16), one side of the cavity is filled with water, a heat conducting member (19) extending into the sedimentation tank (2) is provided in the water, and a pull rope (18) is provided between the moving plate (17) and the moving block (15); Wherein, a heat insulating layer is wrapped on the side wall of the heat conducting member (19).

2. A dechlorination device for hydrogenation of waste lubricating oil vacuum distillate according to claim 1, characterized in that: The outer side of the conduit is wrapped with a heat insulation kit, and a circulation pipeline (20) is arranged inside the heat insulation kit and is wound around the outer side of the conduit. The inlet and outlet of the circulation pipeline (20) are respectively connected to a pump (21) and a water storage mechanism, and the pump (21) is connected to the water storage mechanism; The circulation pipeline (20) passes through the water in the flash tower (3) and the working box (16).

3. A dechlorination device for hydrogenation of waste lubricating oil vacuum distillate according to claim 1, characterized in that: A sleeve (10) is sleeved on the outside of the feed pipe (6), the sleeve (10) is a flexible sleeve, and an elastic member (22) is provided between the sleeve (10) and the feed pipe (6).

4. A dechlorination device for hydrogenation of waste lubricating oil vacuum distillate according to claim 3, characterized in that: The movable member (5) is provided with a mounting groove (13), a guide member and a spring member connected to the guide member are slidably provided on the mounting groove (13), a connecting rope (12) is provided between the guide member and the sleeve (10), a connecting box (14) connected to the sedimentation tank (2) is provided on the mounting box (4), a block for blocking the connecting box (14) and the sedimentation tank (2) is slidably provided on the connecting box (14), and a linkage rope is provided between the block and the guide member.

5. A dechlorination device for hydrogenation of waste lubricating oil vacuum distillate according to claim 1, characterized in that: An arc-shaped baffle (11) and a flexible blocking member (24) are provided at the outlet end of the feed pipe (6); the baffle (11) and the flexible blocking member (24) form an annular member; a connecting member (23) is slidably disposed on the baffle (11) and moves along the arc-shaped edge of the baffle (11) and is connected to the flexible blocking member (24).

6. A method for dechlorinating waste lubricating oil vacuum distillate by hydrogenation, using a dechlorinating device for hydrogenation of waste lubricating oil vacuum distillate as claimed in claim 1, characterized in that: The specific steps include: S1: After adding a dechlorinating agent and distillate oil from the heavy liquid inlet and the light liquid inlet of the rotary disc extraction tower (1) respectively, the rotary disc extraction tower (1) is operated to make the two mixed and reacted to remove the chlorine component in the distillate oil; S2: The salt and the oil with a higher density produced by the reaction fall to the bottom of the rotary disc extraction tower (1) and are discharged from the bottom thereof. The distillate oil from which the chlorine component has been removed is discharged from the light liquid outlet of the rotary disc extraction tower (1), enters the conduit, and then enters the settling tank (2) through the flexible pipe (7) and the feed pipe (6); S3: The detection mechanism detects the liquid level inside the sedimentation tank (2). As the liquid level gradually rises, the moving member (5) is driven to move upward, causing the feed pipe (6) to move upward. S4: After the treated distillate oil completely enters the settling tank (2), it is left to stand to allow the treated distillate oil to settle in the settling tank (2), and then it is input into the flash tower (3) for treatment to remove the mixture contained therein.

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