A distillate nmp extraction pretreatment device and method

Abstract

The application discloses a distillate oil NMP extraction pretreatment device in the technical field of waste lubricating oil treatment, which comprises a reaction tank and a stirring mechanism installed on the reaction tank, a top cover is installed on the top of the reaction tank, two feed pipes are communicated and arranged on the top of the top cover, a discharge port is communicated and arranged on the reaction tank, and a rotating disc is rotatably arranged on the bottom of the top cover; a driving mechanism is connected to the rotating disc, two arc-shaped storage grooves are formed in the top of the rotating disc, and two discharge pipes are arranged on the bottom of the rotating disc; when the distillate oil and ethanolamine are respectively added from the two feed pipes, the driving mechanism is driven to rotate the rotating disc, the two discharge pipes rotate in a circular track, the distillate oil and the ethanolamine discharged from the two discharge pipes are alternately stacked in the reaction tank, so that the distillate oil and the ethanolamine are mixed during the feeding process, the contact between the distillate oil and the ethanolamine is sufficient, the subsequent stirring and mixing time is saved, and the speed of the neutralization reaction is improved.

Description

A distillate oil NMP extraction pretreatment apparatus and method Technical Field

[0001] This invention relates to the field of waste lubricating oil treatment technology, specifically to a distillate oil NMP extraction pretreatment device and method. Background Technology

[0002] Waste lubricating oil is distilled under reduced pressure to obtain distillate oil. Before NMP extraction, the acidity of the distillate oil needs to be neutralized to reduce NMP consumption. Generally, ethanolamine is added to the distillate oil to neutralize the acidity. The distillate oil and ethanolamine are added to the reaction equipment from the feed pipes respectively for mixing and reaction.

[0003] However, distillate oil and ethanolamine are usually added to the reaction equipment separately. Because distillate oil has a certain viscosity and ethanolamine has a high viscosity, the two are difficult to mix after entering the reaction equipment. They need to be stirred for a long time, which will reduce the efficiency of the neutralization reaction. Summary of the Invention

[0004] The purpose of this invention is to provide a distillate oil NMP extraction pretreatment apparatus and method to solve the problem mentioned in the background art that distillate oil and ethanolamine are generally added to the reaction equipment separately, and because distillate oil has a certain viscosity and ethanolamine has a high viscosity, the two are difficult to mix after entering the reaction equipment, requiring a long stirring time, which reduces the neutralization reaction efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a distillate oil NMP extraction pretreatment device, comprising: a reaction tank and a stirring mechanism installed on the reaction tank, the top of the reaction tank is equipped with a top cover, the top of the top cover is connected to two feed pipes, the reaction tank is connected to a discharge port, and the pretreatment device further comprises: a turntable located at the bottom of the top cover.

[0006] The turntable is connected to a drive mechanism. The top of the turntable has two arc-shaped storage slots that extend along the rotation direction of the turntable and are located directly below the two feed pipes. The bottom of the turntable has two discharge pipes that are connected to the two arc-shaped storage slots respectively. Distillate oil and ethanolamine are added from the two feed pipes and fall into the arc-shaped storage slots corresponding to the feed pipes. The drive mechanism drives the turntable to rotate, so that the two discharge pipes rotate in a circular track. The distillate oil and ethanolamine discharged from the two discharge pipes are stacked alternately in layers in the reaction vessel.

[0007] Preferably, the bottom wall of the top cover has two storage slots located directly below the two feed pipes. A baffle for blocking the outlet of the feed pipe and an elastic element connected to the baffle are slidably provided in the storage slots. The bottom of the top cover has two mounting slots. A magnetic block for moving up and down and an elastic element connected to the magnetic block are slidably provided in the mounting slots. A connecting rope is provided between the two magnetic blocks and the two baffles.

[0008] The turntable has two arc-shaped magnetic components extending along the rotation direction of the turntable and used to push the magnetic block upward. The motion tracks formed by the rotation of the two arc-shaped magnetic components do not intersect.

[0009] Preferably, the top of the turntable has a slot, and the bottom of the top cover has a friction element for inserting into the slot. Both the turntable and the top cover are heat-conducting metal parts.

[0010] Preferably, the friction element includes a friction block slidably mounted on the bottom of the top cover and a heat-conducting box. The heat-conducting box is filled with an expansion medium, and a guide channel communicating with the inner cavity of the heat-conducting box is provided on the heat-conducting box. A moving element for driving the friction block to move is slidably provided in the guide channel.

[0011] Preferably, the top cover has an opening that extends through it, and a mounting component is slidably disposed within the opening. The bottom of the mounting component and the top of the turntable are provided with conductive sheets that fit together. The conductive sheets are electrically connected to the power supply of the drive mechanism to cut off the power supply of the drive mechanism.

[0012] Preferably, the top cover is provided with two air storage boxes, each with a support bracket. The support bracket has a nozzle for blowing air into the feed pipe inlet. The nozzle is connected to the air storage box via a connecting pipe. Inside the air storage box, a pressure plate for discharging air from the nozzle and a spring connected to the pressure plate are slidably disposed. An electromagnet is disposed on the pressure plate. Inside the air storage box, a magnetic block is disposed for attracting the electromagnet. A touch switch is disposed inside the magnetic block in the mounting groove. The touch switch is electrically connected to the electromagnet.

[0013] Preferably, the gas storage tank is equipped with a one-way valve for replenishing gas into the tank.

[0014] Preferably, a distillate oil NMP extraction pretreatment method, based on a distillate oil NMP extraction pretreatment apparatus, specifically includes the following steps:

[0015] S1: Distillate oil and ethanolamine are added into two feed pipes respectively. Distillate oil and ethanolamine flow into two arc-shaped storage tanks respectively, and then fall into the reaction tank through the discharge pipe. The drive mechanism works to make the turntable rotate, and the two discharge pipes move in a circular trajectory inside the reaction tank, so that distillate oil and ethanolamine are stacked alternately in the inside of the reaction tank.

[0016] S2: The distillate oil and ethanolamine in the reaction tank are mixed by a stirring mechanism to react and neutralize the acidity in the distillate oil. The treated distillate oil is discharged from the outlet.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: In this application, when distillate oil and ethanolamine are added from two feed pipes respectively, the drive mechanism drives the turntable to rotate, causing the two discharge pipes to rotate in a circular track. The distillate oil and ethanolamine discharged from the two discharge pipes are stacked alternately in the reaction tank, so that the distillate oil and ethanolamine are mixed during the feeding process, so that the two are in full contact, saving the subsequent stirring and mixing time, thereby improving the speed of neutralization reaction and improving the efficiency of waste lubricating oil treatment. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the structure of the present invention;

[0019] Figure 2 is a schematic diagram of the connection structure between the top cover and the turntable of the present invention;

[0020] Figure 3 is a schematic diagram of the connection structure between the top cover and the feed pipe of the present invention;

[0021] Figure 4 is a schematic diagram of the turntable structure of the present invention;

[0022] Figure 5 is a schematic diagram of the top cover structure of the present invention;

[0023] Figure 6 is an enlarged schematic diagram of the structure at point A of the present invention.

[0024] In the diagram: 1. Reaction vessel; 2. Stirring mechanism; 3. Top cover; 4. Feed pipe; 5. Turntable; 6. Drive mechanism; 7. Discharge pipe; 8. Opening; 9. Mounting component; 10. Arc-shaped storage tank; 11. Slot; 12. Arc-shaped magnetic component; 13. Conductive sheet; 14. Collection tank; 15. Baffle; 16. Mounting slot; 17. Magnetic block; 18. Friction component; 181. Friction block; 182. Heat conduction box; 183. Moving component; 19. Gas storage tank; 20. Support; 21. Nozzle; 22. Pressure plate; 23. Electromagnet; 24. Magnetic block; 25. One-way valve. Detailed Implementation

[0025] 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.

[0026] Example 1

[0027] Please refer to Figure 1. A distillate oil NMP extraction pretreatment device includes: a reaction tank 1 and a stirring mechanism 2 installed on the reaction tank 1 (the stirring mechanism 2 consists of a drive motor and stirring blades installed on the output shaft of the drive motor, the stirring blades being located inside the reaction tank 1; the drive motor operates, rotating the stirring blades to stir the inside of the reaction tank 1); a top cover 3 is installed on the top of the reaction tank 1, and two feed pipes 4 are connected to the top of the top cover 3, and a discharge port is connected to the reaction tank 1.

[0028] Please refer to Figures 1, 2, and 3. A turntable 5 is rotatably mounted on the bottom of the top cover 3. A drive mechanism 6 is connected to the turntable 5 to drive the turntable 5 to rotate at the bottom of the top cover 3. The drive mechanism 6 can be a motor, with the output shaft of the motor connected to the turntable 5. The motor drives the turntable 5 to rotate directly. Alternatively, the drive mechanism 6 can consist of a motor, a drive gear mounted on the output shaft of the motor, and a gear ring sleeved on the outside of the turntable 5. The drive gear meshes with the gear ring, and the motor drives the drive gear to rotate, thereby causing the turntable 5 to rotate at the bottom of the top cover 3.

[0029] In this embodiment, as a further optimization, please refer to Figure 1, the top cover 3 is detachably connected to the reaction vessel 1; so that the top cover 3 can be removed from the reaction vessel 1, thereby allowing components such as the turntable 5 to be removed as well.

[0030] Please refer to Figure 4. Two arc-shaped storage slots 10 are provided on the top of the turntable 5. The two arc-shaped storage slots 10 are located directly below the two feed pipes 4. The length extension direction of the arc-shaped storage slots 10 is the same as the rotation direction of the turntable 5. During the rotation of the turntable 5, the arc-shaped storage slots 10 are located directly below the feed pipes 4 for a longer period of time. Two discharge pipes 7 are installed at the bottom of the turntable 5. The two discharge pipes 7 are connected to the two arc-shaped storage slots 10 respectively.

[0031] It should be noted that the distillate oil and ethanolamine are added from two feed pipes 4 respectively, falling into the arc-shaped storage tank 10 corresponding to the feed pipes 4. The drive mechanism 6 drives the turntable 5 to rotate, causing the two discharge pipes 7 to rotate in a circular track, adding the distillate oil and ethanolamine into the reaction tank 1. As the turntable 5 continues to rotate, the distillate oil and ethanolamine discharged from the two discharge pipes 7 will accumulate alternately in the reaction tank 1, so that the distillate oil and ethanolamine are mixed during the feeding process (meaning they are mixed inside the reaction tank 1), increasing the contact area between the two, reducing the subsequent stirring and mixing time, and thus increasing the reaction rate.

[0032] It should also be noted that the rotation speed of turntable 5 is not fast, to ensure that the distillate oil and ethanolamine inside feed pipe 4 can enter the arc-shaped storage tank 10.

[0033] In this embodiment, as a further optimized solution, please refer to Figures 4 and 5. The bottom wall of the top cover 3 has two receiving slots 14, each located directly below a different feed pipe 4. A baffle 15 is slidably installed within each receiving slot 14, capable of moving directly below the feed pipe 4 to block its outlet. An elastic element is installed between the receiving slot 14 and the baffle 15. The bottom of the top cover 3 has two mounting slots 16, each containing a sliding magnetic block 17. The magnetic block 17 can move up and down within the mounting slot 16. An elastic element is installed between the mounting slot 16 and the magnetic block 17. A connecting rope is installed between each magnetic block 17 and the two baffles 15. The top of the turntable 5 is provided with two arc-shaped magnetic components 12, which are located directly below the two magnetic blocks 17. The magnetic poles of the arc-shaped magnetic components 12 and the magnetic blocks 17 are the same on the side that are close to each other, and a repulsive force will be generated between them. The length extension direction of the arc-shaped magnetic components 12 is the same as the rotation direction of the turntable 5, so that when the turntable 5 rotates, the arc-shaped storage groove 10 is still below the feed pipe 4, and the arc-shaped magnetic components 12 are still directly below the magnetic blocks 17. The motion tracks formed by the rotation of the two arc-shaped magnetic components 12 do not intersect.

[0034] It should be noted that when the arc-shaped storage groove 10 is directly below the feed pipe 4, the arc-shaped magnetic component 12 is directly below the magnetic block 17. Due to the repulsive force between the two, the magnetic block 17 will be pushed upwards into the inner cavity of the mounting groove 16. The movement of the magnetic block 17 will pull the connecting rope, causing the baffle 15 to move away from directly below the feed pipe 4, thus connecting the feed pipe 4 with the arc-shaped storage groove 10. After the turntable 5 rotates and the arc-shaped storage groove 10 moves away from directly below the feed pipe 4, the arc-shaped magnetic component 12 is no longer directly below the magnetic block 17. The repulsive force on the magnetic block 17 disappears, and under the action of the elastic element, the magnetic block 17 moves downwards and resets, thus connecting the magnetic block 17 with the magnetic block 17. When the rope is released, the baffle 15 moves to directly below the feed pipe 4 under the action of the elastic element, blocking the outlet of the feed pipe 4. When the left arc-shaped storage tank 10 moves to directly below the right feed pipe 4, and the right arc-shaped storage tank 10 moves to directly below the left feed pipe 4, the movement tracks formed by the rotation of the two arc-shaped magnetic elements 12 do not intersect, so the arc-shaped magnetic elements 12 and the magnetic block 17 are misaligned at this time. Therefore, the feed pipe 4 does not open. When the turntable 5 continues to rotate and the arc-shaped storage tank 10 returns to its initial position, the feed pipe 4 will open, so that ethanolamine and distillate oil will not mix inside the arc-shaped storage tank 10, and the two will not react at this time.

[0035] In this embodiment, as a further optimized solution, please refer to Figures 4 and 5. The top of the turntable 5 is provided with a slot 11, and the bottom of the top cover 3 is provided with a friction element 18. The friction element 18 is inserted into the slot 11 and the two are in contact. The friction element 18 is made of a heat-conducting metal material (iron, copper, etc.). Both the turntable 5 and the top cover 3 are heat-conducting metal parts (iron, copper, etc.). When the turntable 5 rotates under the top cover 3, the friction element 18 will rotate inside the slot 11. The friction between the two will generate heat, which will be conducted to the turntable 5 and the top cover 3, making them hot. This heats the distillate oil and ethanolamine at the feed pipe 4, the arc-shaped storage tank 10, and the discharge pipe 7, reducing their viscosity and facilitating rapid discharge.

[0036] In this embodiment, as a further optimized solution, please refer to Figure 5. The friction component 18 includes a friction block 181 and a heat-conducting box 182, both of which are made of heat-conducting metal materials (copper, iron, etc.). The friction block 181 is slidably installed at the bottom of the top cover 3. The heat-conducting box 182 is installed at the bottom of the top cover 3 and is filled with an expansion medium (mercury or gas). A guide channel communicating with the inner cavity of the heat-conducting box 182 is provided on the heat-conducting box 182. A moving component 183 is slidably installed in the guide channel and is connected to the friction block 181. When the friction component 18 rotates inside the slot 11, the heat-conducting box 182 will be heated, causing the expansion medium to expand and push the moving component 183 to the outside of the guide channel, which will provide a thrust to the friction block 181, increasing the pressure between the friction block 181 and the inner wall of the slot 11, thereby increasing the friction between the two and generating more heat.

[0037] In this embodiment, as a further optimization, please refer to Figures 3, 4, and 5. The top of the top cover 3 has an opening 8 that extends through it. A mounting member 9 is slidably installed in the opening 8 and can move up and down within the opening 8. The bottom of the mounting member 9 and the top of the turntable 5 are both provided with conductive plates 13. The conductive plates 13 are electrically connected to the power supply of the drive mechanism 6 through the wire. When the drive mechanism 6 rotates the turntable 5, when the turntable 5 does not need to rotate, the mounting member 9 is pressed down, causing the upper conductive plate 13 to move down. The rotation of the turntable 5 will cause the lower conductive plate 13 to fit against the upper conductive plate 13, cutting off the power supply of the drive mechanism 6 and stopping the turntable 5 from working. This ensures that when the turntable 5 stops rotating, the arc-shaped storage groove 10 returns to its initial position, corresponding to the feed pipe 4.

[0038] Example 2

[0039] As an optimized solution, please refer to Figures 1 and 6. The top cover 3 has two air storage boxes 19, each with a support 20. A nozzle 21 is mounted on the support 20, with each nozzle facing the inlet end of one of the two feed pipes 4. The nozzles 21 are connected to the air storage boxes 19 via connecting pipes. A pressure plate 22 slides inside the air storage box 19, moving within it to expel air from the nozzles 21. A spring is installed between the air storage box 19 and the pressure plate 22. An electromagnet 23 is mounted on the pressure plate 22, and a magnetic block 24 is located inside the air storage box 19. The magnetic block 24 and electromagnet 23 are opposite each other, with opposite magnetic poles on their closest sides, creating an attractive force. A touch switch is located in the mounting slot 16, and the touch switch is in a magnetic state. Inside block 17, a touch switch is electrically connected to electromagnet 23 via a wire. When turntable 5 rotates, the arc-shaped storage slot 10 is moved away from directly below feed pipe 4, causing magnetic block 17 to move downwards. This causes the magnetic block 17 to lose its pressure on the touch switch, energizing electromagnet 23, which attracts magnetic block 24 and moves pressure plate 22 to the right. As turntable 5 continues to rotate, when feed pipe 4 returns to its initial position, magnetic block 17 moves upwards, pressing the touch switch and de-energizing electromagnet 23, thus eliminating the attraction between electromagnet 23 and magnetic block 24. Under the action of the spring, pressure plate 22 moves to the left, squeezing out the air inside gas storage tank 19 and spraying it from nozzle 21 to the feed end of feed pipe 4, facilitating the addition of distillate oil and ethanolamine into reaction tank 1 through feed pipe 4 and increasing the feeding speed.

[0040] In this embodiment, as a further optimization, please refer to Figure 6. The air storage tank 19 is equipped with a one-way valve 25. During the process of the pressure plate 22 moving to the right, outside air enters the left side of the inner cavity of the air storage tank 19 through the one-way valve 25 to replenish the air storage tank 19.

[0041] A method for NMP extraction pretreatment of distillate oils, based on an NMP extraction pretreatment apparatus for distillate oils, specifically includes the following steps:

[0042] S1: Distillate oil and ethanolamine are added into the two feed pipes 4 respectively. The distillate oil and ethanolamine flow into the two arc-shaped storage tanks 10 respectively (the feeding process is continuous), and then fall into the reaction tank 1 through the discharge pipe 7. During the feeding process, the drive mechanism 6 works to make the turntable 5 rotate, which moves the two discharge pipes 7 in a circular trajectory inside the reaction tank 1. The turntable 5 rotates continuously, so that the distillate oil and ethanolamine are alternately accumulated inside the reaction tank 1.

[0043] The mixing mass ratio of ethanolamine to distillate oil is 2%-5% of the mass of the distillate oil.

[0044] S2: The distillate oil in the reaction tank 1 is mixed with ethanolamine using the stirring mechanism 2 to react the two and neutralize the acidity in the distillate oil. The treated distillate oil is then discharged from the outlet.

[0045] The reaction temperature is 40℃-60℃, and the salts in the distillate oil are removed by atmospheric pressure differential distillation (the salts are produced by the neutralization reaction).

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A distillate oil NMP extraction pretreatment apparatus, comprising: The reaction vessel (1) and the stirring mechanism (2) installed on the reaction vessel (1) are characterized in that: the pretreatment device further includes: a rotating turntable (5) located at the bottom of the turntable (3); a driving mechanism (6) is connected to the turntable (5); two arc-shaped storage troughs (10) extending along the rotation direction of the turntable (5) and located directly below the two feed pipes (4) are opened on the top of the turntable (5); two discharge pipes (7) connected to the two arc-shaped storage troughs (10) are provided at the bottom of the turntable (5); distillate oil and ethanolamine are added from the two feed pipes (4) and fall into the arc-shaped storage troughs (10) corresponding to the feed pipes (4). Inside the reaction vessel (1), the drive mechanism (6) drives the turntable (5) to rotate, causing the two discharge pipes (7) to rotate in a circular track, and the distillate oil and ethanolamine discharged from the two discharge pipes (7) are stacked alternately in the reaction vessel (1); the turntable (5) has a slot (11) on the top, and the top cover (3) has a friction element (18) for inserting into the slot (11) at the bottom. The turntable (5) and the top cover (3) are both heat-conducting metal parts; the friction element (18) includes a friction block (181) slidably installed at the bottom of the top cover (3) and a heat-conducting box (182). The heat-conducting box (182) is filled with an expansion medium. The heat-conducting box (182) has a guide channel communicating with the inner cavity of the heat-conducting box (182). A moving part (183) for driving the friction block (181) to move is slidably installed in the guide channel.

2. The distillate oil NMP extraction pretreatment apparatus according to claim 1, characterized in that: The bottom wall of the top cover (3) has two storage slots (14) located directly below the two feed pipes (4). The storage slots (14) are equipped with baffles (15) for blocking the outlet of the feed pipes (4) and elastic elements connected to the baffles (15). The bottom of the top cover (3) has two mounting slots (16). The mounting slots (16) are equipped with magnetic blocks (17) for moving up and down and elastic elements connected to the magnetic blocks (17). The two magnetic blocks (17) are connected to the two baffles (15) respectively. The top of the turntable (5) is equipped with two arc-shaped magnetic elements (12) that extend along the rotation direction of the turntable (5) and are used to push the magnetic blocks (17) upward. The movement tracks formed by the rotation of the two arc-shaped magnetic elements (12) do not intersect.

3. The distillate oil NMP extraction pretreatment apparatus according to claim 1, characterized in that: The top cover (3) has an opening (8) through it. An installation part (9) is slidably provided in the opening (8). The bottom of the installation part (9) and the top of the turntable (5) are provided with conductive sheets (13) that fit together. The conductive sheets (13) are electrically connected to the power supply of the drive mechanism (6) to cut off the power supply of the drive mechanism (6).

4. The distillate oil NMP extraction pretreatment apparatus according to claim 2, characterized in that: The top cover (3) is provided with two air storage boxes (19), and the air storage box (19) is provided with a bracket (20). The bracket (20) is provided with a nozzle (21) for blowing air into the feed pipe (4). The nozzle (21) is connected to the air storage box (19) through a connecting pipe. The air storage box (19) is provided with a pressure plate (22) for discharging the air inside the air storage box (19) from the nozzle (21) and a spring connected to the pressure plate (22). The pressure plate (22) is provided with an electromagnet (23). The air storage box (19) is provided with a magnetic block (24) for attracting the electromagnet (23). The mounting groove (16) is provided with a touch switch inside the magnetic block (17). The touch switch is electrically connected to the electromagnet (23).

5. The distillate oil NMP extraction pretreatment apparatus according to claim 4, characterized in that: The gas storage tank (19) is equipped with a one-way valve (25) for replenishing gas inside the gas storage tank (19).

6. A method for NMP extraction pretreatment of distillate oils, comprising the distillate oil NMP extraction pretreatment apparatus according to claim 1, characterized in that: Specifically, the following steps are included: S1: Distillate oil and ethanolamine are added into the two feed pipes (4) respectively. Distillate oil and ethanolamine flow into the two arc-shaped storage tanks (10) respectively, and then fall into the reaction tank (1) through the discharge pipe (7). The drive mechanism (6) works to make the turntable (5) rotate, and the two discharge pipes (7) move in a circular trajectory inside the reaction tank (1), so that the distillate oil and ethanolamine are stacked alternately in the inside of the reaction tank (1). S2: The distillate oil in the reaction tank (1) is mixed with ethanolamine by the stirring mechanism (2) to react the two and neutralize the acidity in the distillate oil. The treated distillate oil is discharged from the outlet.

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