A gasoline catalytic distillation desulfurization device and method

Abstract

The present invention discloses a gasoline catalytic distillation desulfurization device and method, which relates to the technical field of hydrogenated gasoline processing, and aims to solve the technical problems that the existing distillation desulfurization device can fractionate a variety of oil resources through different temperatures, but has a single function, and is limited by the gas retention time, resulting in low desulfurization efficiency, and distillation that relies on the gas floating characteristics is also prone to cause local hot spots and coking, affecting processing safety and quality, including a sealing component, a driving component connected to the sealing component, and a collection component located in the sealing component. The present invention can ensure that gasoline vapor is uniformly in contact with the solid catalyst to ensure the desulfurization effect by designing the collection component and the isolation component. On the other hand, in conjunction with the operation of the motor, the gas can be uniformly in contact with the isolation component and the collection component, avoiding the formation of hot spots and coking caused by excessively high local temperatures in the tower, thereby ensuring the safety of the device and the quality of the processed gasoline.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrotreated gasoline processing, and more specifically, to a gasoline catalytic distillation desulfurization device and method. Background Art

[0002] With the increasing environmental protection requirements, the use of leaded antiknock agents is generally prohibited, and the allowed sulfur content in fuel oil is continuously reduced. Therefore, the clean fuel production process is particularly important. The sulfides in fluid catalytic cracking gasoline (hereinafter referred to as FCC gasoline) are mainly organic compounds, including mercaptans, sulfides, disulfides, tetrahydrothiophene, thiophene, benzothiophene, etc. The stable conjugated structure of itself makes it difficult to deeply desulfurize FCC gasoline.

[0003] Although the existing distillation desulfurization devices have the ability to fractionate gasoline at different temperatures and can sequentially separate diverse oil resources such as diesel, gasoline, and kerosene, they are still insufficient in terms of functional integration and process flexibility. Specifically, such devices are difficult to accurately adapt and dynamically adjust the processing flow according to actual process requirements by flexibly adjusting key parameters such as rotation speed and discharge frequency, which is stretched when dealing with complex and changeable processing scenarios. In terms of desulfurization efficiency, the existing devices are limited by the short residence time of gas in the distillation column, resulting in insufficient desulfurization reaction and thus affecting the overall desulfurization effect. At the same time, its desulfurization mechanism overly relies on the natural floating characteristics of gas to complete the distillation condensation process. This non-active mass transfer method is extremely likely to cause local overheating in the column, forming hot spots and accompanied by coking phenomena, which not only threatens the safe and stable operation of the equipment but also significantly reduces the quality of oil processing. In view of this, we propose a gasoline catalytic distillation desulfurization device and method. Summary of the Invention

[0004] The purpose of the present invention is to provide a gasoline catalytic distillation desulfurization device and method to solve the technical problems that although the existing distillation desulfurization devices can fractionate various oil resources at different temperatures, they have a single function, and the desulfurization efficiency is low due to the limitation of gas retention time, and relying on the floating characteristics of gas for distillation is also prone to cause local hot spots and coking, affecting processing safety and quality.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A gasoline catalytic distillation desulfurization device and method, including a fractionating column, a light fraction column, a heavy fraction column, and a pre-hydrogenation reactor, further including,

[0006] The fractionating column is respectively connected to the light fraction column and the heavy fraction column, the heavy fraction column is connected to the pre-hydrogenation reactor, the pre-hydrogenation reactor is connected to the catalytic distillation column, and the catalytic distillation column is connected to the reflux treatment tank;

[0007] The catalytic distillation column includes a sealing assembly, a driving assembly connected to the sealing assembly, a collecting assembly located within the sealing assembly, an isolation assembly, and a discharge pipe. Among them, the isolation assembly is connected to the discharge pipe, and the isolation assembly is located within the sealing assembly;

[0008] The sealing assembly forms different reaction zones by relying on the collecting assembly and the isolation assembly, and the driving assembly provides power for the collecting assembly.

[0009] In the present invention, the discharged gas enters the isolation assembly along the middle and discharges to the surroundings. On the one hand, it can ensure that the gasoline vapor uniformly contacts the solid catalyst to guarantee the desulfurization effect. On the other hand, in cooperation with the operation of the motor, the gas can uniformly contact the isolation assembly and the collecting assembly, avoiding the occurrence of local overheating in the tower, the formation of hot spots, and coking phenomena, ensuring the safe use of the device and the quality of the processed gasoline.

[0010] Preferably, the sealing assembly is in transmission connection with the driving assembly, the driving assembly is in transmission connection with the collecting assembly, the collecting assembly overlaps with several isolation assemblies, the collecting assembly is respectively communicated with several discharge pipes, the isolation assembly is fixedly connected to the discharge pipe, and the discharge pipe is fixedly connected to the sealing assembly.

[0011] Preferably, the sealing assembly includes an outer cylinder, a sealing plate is clamped above the outer cylinder, the sealing plate is annular, the upper part of the outer cylinder is communicated with a recovery pipe, a motor is fixedly connected above the recovery pipe, the output shaft below the motor passes through the recovery pipe and is located within the outer cylinder, a heat conducting plate is fixedly connected within the outer cylinder, and several heat dissipation fins are fixedly connected outside the heat conducting plate.

[0012] Preferably, the driving assembly is clamped outside the outer cylinder, several heat dissipation fins are located within the driving assembly, the discharge pipe is fixedly connected to the outer cylinder, and the top end of the driving assembly is fixedly connected to the sealing plate.

[0013] Preferably, the driving assembly includes a rotating shaft, a connecting frame is fixedly connected outside the rotating shaft, the connecting frame is respectively fixedly connected to three isolation sleeves, and sealing grooves are formed above and below the three isolation sleeves. The three isolation sleeves are respectively clamped with six sealing sleeves through the sealing grooves, the isolation sleeves are rotatably connected within the sealing sleeves, and several flow guiding plates are fixedly connected within the three isolation sleeves;

[0014] The top end of the rotating shaft is in transmission connection with the output shaft below the motor, the connecting frame is fixedly connected to the sealing plate, and the six sealing sleeves are all fixedly connected outside the outer cylinder.

[0015] Preferably, the collection assembly includes a mounting frame, a connecting cylinder is fixedly connected to the outside of the mounting frame, three driving plates are fixedly connected inside the connecting cylinder, and a solid catalyst is fixedly connected above each of the three driving plates. A mold with holes is arranged above the driving plate, the solid catalyst is located in the mold above the driving plate, a plurality of reaction holes are formed above the solid catalyst, a plurality of diversion grooves are formed above the solid catalyst, and a plurality of the diversion grooves are all designed to be inclined. A chute is arranged above the driving plate, four feeding holes are formed above the driving plate, and baffles are fixedly connected outside each of the four feeding holes.

[0016] Preferably, the mounting frame is fixedly connected to the bottom end of the rotating shaft, the upper parts of a plurality of the solid catalysts are respectively lapped with the lower parts of a plurality of isolation assemblies, a sealing bearing is clamped below the driving plate, and the driving plate is sleeved outside the discharge pipe through the sealing bearing.

[0017] Preferably, the isolation assembly includes a collection cover, a plurality of steam holes are formed above the collection cover, the upper part of the collection cover is designed to be conical, a plurality of through holes are formed below the collection cover, the lower part of the collection cover is lapped with an isolation cover, a placement hole is formed below the isolation cover, and a positioning frame is fixedly connected below the collection cover.

[0018] Preferably, the collection cover is fixedly connected to the inner wall of the discharge pipe through the positioning frame, the isolation cover is fixedly connected to the connecting cylinder, the shape of the upper part of the isolation cover is adapted to the shape of the lower part of the collection cover, the isolation cover is designed to be semi-circular, and the positioning frame is located in the placement hole.

[0019] A gasoline catalytic distillation desulfurization method includes the following processing steps:

[0020] S1. The raw gasoline is cut into light fractions and heavy fractions through a fractionating tower;

[0021] S1.1. The light fractions are directly used as light gasoline products after being treated by caustic washing or mercaptan desulfurization through a light fraction tower;

[0022] S1.2. The heavy fractions enter a pre-hydrogenation reactor through a heavy fraction tower to saturate diolefins and partially convert mercaptans;

[0023] S2. The chemical reaction and separation functions in the catalytic distillation tower enable mercaptans to react and be converted into other compounds, thereby realizing partial conversion of mercaptans. Different raw materials with different concentrations can be processed by relying on different isolation assemblies and collection assemblies, or gasoline, diesel and other products can be separately processed from the raw materials;

[0024] S3. The light components and hydrogen sulfide generated at the top of the tower are condensed and separated, and the hydrogen sulfide is recovered and processed;

[0025] S4. The bottom product enters the stabilizer column, and after further separation, a blended gasoline product is obtained.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. By designing the collection component and the isolation component, after gasoline desulfurization pre-hydrogenation, the gasoline is injected below the outer cylinder and then gradually moves upward with the collection component. At this time, according to the type of processed gasoline, the temperature between the drive component and the sealing component needs to be adjusted. During the gasoline desulfurization process, the gasoline rises through the collection component and is between the collection component and the isolation component. As the drive component runs at a low speed, the collection component will rotate accordingly. The processed gasoline will enter between the upper collection component and the isolation component, and the condensed gasoline will enter the discharge pipe along the isolation component. The device intermittently discharges gasoline vapor through the operation of the motor, and while discharging the vapor, the desulfurized gasoline will be discharged along the discharge pipe. By using an isolation component with a conical design, the gas enters from the middle and discharges to the surroundings. This design can, on the one hand, ensure that the gasoline vapor uniformly contacts the solid catalyst to guarantee the desulfurization effect; on the other hand, in cooperation with the operation of the motor, the gas can uniformly contact the isolation component and the collection component, avoiding the formation of a hot spot area and coking phenomenon due to local overheating in the tower, ensuring the use safety of the device and the quality of the processed gasoline.

[0028] 2. The present invention also designs the drive component and the collection component. When the vaporized gasoline enters the outer cylinder, it will enter above the drive plate through the feed hole below the drive plate and be blocked by the collection cover and the isolation cover, and then spread around along the lower part of the collection cover and the isolation cover. At the same time, the spread vaporized gasoline will fully contact the solid catalyst, and the motor will drive the isolation cover, the connecting cylinder, and the drive plate to rotate, further improving the contact efficiency between the vaporized gasoline and the solid catalyst. After rotating 180 degrees, the isolation cover no longer blocks the steam hole and the through hole, so that the preliminarily reacted vaporized gasoline moves upward along the steam hole and enters between the upper collection cover and the drive plate, while the condensed gasoline collected above will drip onto the drive plate along the through hole and enter the discharge pipe along the inclined groove above the drive plate and then be discharged. Relying on multiple drive plates and collection covers above to complete the above steps multiple times, the gasoline is fully desulfurized, ensuring the catalytic desulfurization effect of the device on gasoline. Moreover, through the rotation method and the multi-stage treatment method, the contact efficiency between the vaporized gasoline and the solid catalyst is increased, improving the processing quality and processing effect of the device.

[0029] 3. The present invention also designs a collection component. When steam enters between the driving plate and the collection cover, the steam will rise around along the inclined surface under the collection cover. During the condensation process, the steam will drip and flow along the chute. Since the discharge pipe is designed to be sealed and is located below the driving plate, it is difficult for the rising steam to be discharged along the discharge pipe, while the condensed gasoline will be discharged along different discharge pipes respectively, avoiding the waste of resources caused by steam leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a flow chart of the present invention;

[0031] Figure 2 is a schematic structural diagram of the catalytic distillation column of the present invention;

[0032] Figure 3 is a schematic structural diagram of the driving component of the present invention;

[0033] Figure 4 is of the present invention Figure 3 schematic enlarged structural diagram at A in;

[0034] Figure 5 is a schematic sectional structural diagram of the sealing component of the present invention;

[0035] Figure 6 is a schematic structural diagram of the collection component of the present invention;

[0036] Figure 7 is a schematic sectional structural diagram of the isolation component of the present invention;

[0037] Figure 8 is a schematic sectional structural diagram of the driving plate of the present invention.

[0038] Explanation of the reference numerals in the drawings:

[0039] 1. Fractionating tower; 2. Light fraction tower; 3. Heavy fraction tower; 4. Pre-hydrogenation reactor; 5. Catalytic distillation column; 6. Reflux treatment tank;

[0040] 51. Sealing component; 52. Driving component; 53. Collection component; 54. Isolation component; 55. Discharge pipe;

[0041] 511. Outer cylinder; 512. Sealing plate; 513. Recovery pipe; 514. Motor; 515. Heat conducting plate; 516. Heat sink;

[0042] 521. Rotating shaft; 522. Connecting frame; 523. Isolation sleeve; 524. Sealing groove; 525. Sealing sleeve; 526. Deflector;

[0043] 531. Mounting frame; 532. Connecting cylinder; 533. Driving plate; 534. Solid catalyst; 535. Reaction hole; 536. Flow guiding groove; 537. Inclined groove; 538. Feeding hole; 539. Baffle plate;

[0044] 541. Collection hood; 542. Steam hole; 543. Through hole; 544. Isolation hood; 545. Placement hole; 546. Positioning frame. Detailed implementation manner

[0045] As Figures 1 to 8 shown, a gasoline catalytic distillation desulfurization device and method according to the present invention includes a fractionating tower 1, a light fraction tower 2, a heavy fraction tower 3 and a pre-hydrogenation reactor 4, and further includes,

[0046] The fractionating tower 1 is respectively connected to the light fraction tower 2 and the heavy fraction tower 3, the heavy fraction tower 3 is connected to the pre-hydrogenation reactor 4, the pre-hydrogenation reactor 4 is connected to the catalytic distillation tower 5, the catalytic distillation tower 5 is connected to the reflux treatment tank 6, and the catalytic distillation tower 5 includes a sealing assembly 51, a driving assembly 52 connected to the sealing assembly 51, a collection assembly 53 located in the sealing assembly 51, an isolation assembly 54 and a discharge pipe 55. Among them, the isolation assembly 54 is connected to the discharge pipe 55, the isolation assembly 54 is located in the sealing assembly 51, and the sealing assembly 51 relies on the collection assembly 53 and the isolation assembly 54 to form different reaction zones. The driving assembly 52 provides power for the collection assembly 53. By designing the collection assembly 53 and the isolation assembly 54, after pre-hydrogenation of gasoline desulfurization, gasoline will be injected below the outer cylinder 511, and then gradually move up with the collection assembly 53. At this time, according to the different types of processed gasoline, the temperature between the driving assembly 52 and the sealing assembly 51 needs to be adjusted. During the gasoline desulfurization process, gasoline rises through the collection assembly 53 and is between the collection assembly 53 and the isolation assembly 54. As the driving assembly 52 runs at a low speed, the collection assembly 53 will rotate with it. The processed gasoline will enter between the upper collection assembly 53 and the isolation assembly 54, and the condensed gasoline will enter the discharge pipe 55 along the isolation assembly 54. The device intermittently discharges gasoline vapor through the operation of the motor 514, and at the same time as discharging the vapor, the desulfurized gasoline will be discharged along the discharge pipe 55. By adopting the isolation assembly 54 with a conical design, the gas will discharge to the surroundings after entering from the middle. This design can, on the one hand, ensure that the gasoline vapor evenly contacts the solid catalyst 534 to guarantee the desulfurization effect; on the other hand, in cooperation with the operation of the motor 514, the gas can evenly contact the isolation assembly 54 and the collection assembly 53, avoiding the formation of a hot spot area and coking phenomenon due to local overheating in the tower, ensuring the use safety of the device and the quality of the processed gasoline.

[0047] In an embodiment of the present invention, the sealing assembly 51 is in transmission connection with the driving assembly 52, the driving assembly 52 is in transmission connection with the collecting assembly 53, the collecting assembly 53 is lapped with a plurality of isolation assemblies 54, the collecting assembly 53 is respectively communicated with a plurality of discharge pipes 55, the isolation assembly 54 is fixedly connected to the discharge pipe 55, the discharge pipe 55 is fixedly connected to the sealing assembly 51. The sealing assembly 51 includes an outer cylinder 511, a sealing plate 512 is clamped above the outer cylinder 511. The sealing plate 512 is annular. The upper part of the outer cylinder 511 is communicated with a recovery pipe 513. A motor 514 is fixedly connected above the recovery pipe 513. The output shaft below the motor 514 passes through the recovery pipe 513 and is located inside the outer cylinder 511. A heat conducting plate 515 is fixedly connected inside the outer cylinder 511. A plurality of heat dissipation fins 516 are fixedly connected outside the heat conducting plate 515. The driving assembly 52 is clamped outside the outer cylinder 511. A plurality of heat dissipation fins 516 are located inside the driving assembly 52. The discharge pipe 55 is fixedly connected to the outer cylinder 511. The top end of the driving assembly 52 is fixedly connected to the sealing plate 512. By designing the driving assembly 52 and the collecting assembly 53, when the vaporized gasoline enters the outer cylinder 511, it will enter above the driving plate 533 along the feeding hole 538 below the driving plate 533 and be blocked by the collecting cover 541 and the isolation cover 544, and then diffuse around along the lower sides of the collecting cover 541 and the isolation cover 544. At the same time, the diffused vaporized gasoline will fully contact the solid catalyst 534, and the motor 514 will drive the isolation cover 544, the connecting cylinder 532 and the driving plate 533 to rotate, further improving the contact efficiency between the vaporized gasoline and the solid catalyst 534. After rotating 180 degrees, the isolation cover 544 no longer blocks the steam holes 542 and the through holes 543, so that the initially reacted vaporized gasoline moves up along the steam holes 542 and enters between the upper collecting cover 541 and the driving plate 533, while the condensed gasoline collected above will drip onto the driving plate 533 along the through holes 543 and enter the discharge pipe 55 along the inclined groove 537 above the driving plate 533 and thus be discharged. Relying on the multiple driving plates 533 and the collecting cover 541 above to complete the above steps multiple times, the gasoline is fully desulfurized, ensuring the catalytic desulfurization effect of the device on gasoline. Moreover, through the rotation method and the multi-stage treatment method, the contact efficiency between the vaporized gasoline and the solid catalyst 534 is increased, and the quality of the gasoline processed by the device is improved.

[0048] In an embodiment of the present invention, the driving assembly 52 includes a rotating shaft 521. A connecting frame 522 is fixedly connected to the outside of the rotating shaft 521. The connecting frame 522 is fixedly connected to three isolation sleeves 523 respectively. Sealing grooves 524 are formed above and below the three isolation sleeves 523. The three isolation sleeves 523 are respectively clamped with six sealing sleeves 525 through the sealing grooves 524. The isolation sleeves 523 are rotatably connected within the sealing sleeves 525. A plurality of flow guiding plates 526 are fixedly connected within the three isolation sleeves 523. The top end of the rotating shaft 521 is in transmission connection with the output shaft below the motor 514. The connecting frame 522 is fixedly connected to the sealing plate 512. The six sealing sleeves 525 are all fixedly connected to the outside of the outer cylinder 511. By designing the sealing sleeves 525 and the isolation sleeves 523 outside the outer cylinder 511, liquids at different temperatures can be injected into the interiors of these components during processing, so that the device can adapt to the processing of gasoline with different concentrations, improving the applicability of the device;

[0049] Since when the motor 514 operates, it will drive the isolation sleeve 523 to rotate through the connecting frame 522, and the flow guiding plate 526 is designed within the isolation sleeve 523. Therefore, when the isolation sleeve 523 rotates, the flow guiding plate 526 will drive the liquid to flow within the isolation sleeve 523, accelerating heat transfer, and thus controlling the temperature between different collecting covers 541 and the driving plate 533.

[0050] As another embodiment of the present invention, the collecting assembly 53 includes a mounting frame 531. A connecting cylinder 532 is fixedly connected to the outside of the mounting frame 531. Three driving plates 533 are fixedly connected within the connecting cylinder 532. A solid catalyst 534 is fixedly connected above each of the three driving plates 533. A mold with holes is arranged above the driving plate 533. The solid catalyst 534 is located within the mold above the driving plate 533. A plurality of reaction holes 535 are formed above the solid catalyst 534. A plurality of flow guiding grooves 536 are formed above the solid catalyst 534. The plurality of flow guiding grooves 536 are all designed to be inclined. An inclined groove 537 is arranged above the driving plate 533. Four feeding holes 538 are formed above the driving plate 533. Baffles 539 are fixedly connected outside the four feeding holes 538. The mounting frame 531 is fixedly connected to the bottom end of the rotating shaft 521. The upper parts of the plurality of solid catalysts 534 are respectively lapped with the lower parts of the plurality of isolation assemblies 54. A sealing bearing is clamped below the driving plate 533. The driving plate 533 is sleeved outside the discharge pipe 55 through the sealing bearing. By designing the collecting assembly 53, when the steam enters between the driving plate 533 and the collecting cover 541, it will rise around along the inclined surface below the collecting cover 541. During the condensation process, the steam will drip and flow along the inclined groove 537. Since the discharge pipe 55 is hermetically designed and located below the driving plate 533, the rising steam is difficult to be discharged through the discharge pipe 55, while the condensed gasoline will be discharged through different discharge pipes 55 respectively, thus avoiding the waste of resources caused by steam leakage;

[0051] By designing a baffle 539 outside the feed hole 538, it is ensured that steam can enter stably, and at the same time, the liquid flowing above the drive plate 533 can be restricted, avoiding the leakage caused by gasoline dripping along the feed hole 538.

[0052] As another embodiment of the present invention, the isolation component 54 includes a collection cover 541. A plurality of steam holes 542 are provided above the collection cover 541. The upper part of the collection cover 541 is designed in a conical shape. A plurality of through holes 543 are provided below the collection cover 541. The lower part of the collection cover 541 is lapped with the isolation cover 544. A placement hole 545 is provided below the isolation cover 544. A positioning frame 546 is fixedly connected to the lower part of the collection cover 541. The collection cover 541 is fixedly connected to the inner wall of the discharge pipe 55 through the positioning frame 546. The isolation cover 544 is fixedly connected to the connecting cylinder 532. The shape of the upper part of the isolation cover 544 is adapted to the shape of the lower part of the collection cover 541. The isolation cover 544 adopts a semi-circular design. The positioning frame 546 is located in the placement hole 545. By dividing the collection cover 541 into two halves and designing a plurality of through holes 543 and steam holes 542 in one of the halves, when the isolation cover 544 blocks the through holes 543 and steam holes 542, the steam is difficult to rise. At this time, the steam will fully react with the solid catalyst 534. As the motor 514 rotates, the isolation cover 544 will intermittently disengage from the collection cover 541 on the side provided with the through holes 543 and steam holes 542. At this time, the gas rises and the liquid falls, enabling the device to achieve the effect of intermittent feeding and discharging;

[0053] Since the through holes 543 and steam holes 542 are provided on the same side of the collection cover 541, the liquid can be discharged synchronously when the gas flows, ensuring that a large amount of steam can be discharged along the steam holes 542 with a larger diameter and closer to the edge, reducing the pressure between the collection cover 541 and the drive plate 533, and ensuring that the liquid can fall stably.

[0054] Working principle: This embodiment provides a gasoline catalytic distillation desulfurization device and method. When in use, after gasoline is pre-hydrogenated for desulfurization and injected below the outer cylinder 511, it will gradually move up with the collection component 53. At this time, according to the different types of gasoline to be processed, the temperature between the drive component 52 and the sealing component 51 needs to be adjusted. During the gasoline desulfurization process, the gasoline rises through the collection component 53 and is between the collection component 53 and the isolation component 54. As the drive component 52 runs at a low speed, the collection component 53 will rotate together. The processed gasoline will enter between the upper collection component 53 and the isolation component 54, and the condensed gasoline will enter the discharge pipe 55 along the isolation component 54. The device intermittently discharges gasoline steam through the operation of the motor 514, and at the same time as discharging the steam, the desulfurized gasoline will be discharged along the discharge pipe 55;

[0055] When the vaporized gasoline enters the outer cylinder 511, it will enter the area above the driving plate 533 along the feeding hole 538 below the driving plate 533 and be blocked by the collecting hood 541 and the isolating hood 544. Subsequently, it will diffuse around along the lower part of the collecting hood 541 and the isolating hood 544. At the same time, the diffused vaporized gasoline will come into full contact with the solid catalyst 534. Meanwhile, the motor 514 drives the isolating hood 544, the connecting cylinder 532 and the driving plate 533 to rotate, further improving the contact efficiency between the vaporized gasoline and the solid catalyst 534;

[0056] After rotating 180 degrees, the isolating hood 544 no longer blocks the steam hole 542 and the through hole 543. The vaporized gasoline that has undergone preliminary reaction will move upward along the steam hole 542 and enter the space between the upper collecting hood 541 and the driving plate 533. The condensed gasoline collected above will drip onto the driving plate 533 along the through hole 543 and enter the discharge pipe 55 along the inclined groove 537 above the driving plate 533 and be discharged. By relying on the multiple driving plates 533 and collecting hoods 541 above to repeat the above steps multiple times, the gasoline can be fully desulfurized.

[0057] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A gasoline catalytic distillation desulfurization device, comprising a fractionating tower (1), a light fraction tower (2), a heavy fraction tower (3) and a pre-hydrogenation reactor (4), characterized in that, It further includes The fractionating tower (1) is respectively connected to the light fraction tower (2) and the heavy fraction tower (3), the heavy fraction tower (3) is connected to the pre-hydrogenation reactor (4), the pre-hydrogenation reactor (4) is connected to the catalytic distillation tower (5), and the catalytic distillation tower (5) is connected to the reflux treatment tank (6); The catalytic distillation tower (5) includes a sealing assembly (51), a driving assembly (52) connected to the sealing assembly (51), a collecting assembly (53) located within the sealing assembly (51), an isolation assembly (54), and a discharge pipe (55). Among them, the isolation assembly (54) is connected to the discharge pipe (55), and the isolation assembly (54) is located within the sealing assembly (51); The sealing assembly (51) forms different reaction zones by relying on the collecting assembly (53) and the isolation assembly (54), and the driving assembly (52) provides power for the collecting assembly (53); The sealing assembly (51) includes an outer cylinder (511), a sealing plate (512) is snap-fitted above the outer cylinder (511), the sealing plate (512) is annular, the upper part of the outer cylinder (511) is connected to a recovery pipe (513), a motor (514) is fixedly connected above the recovery pipe (513), the output shaft of the motor (514) below passes through the recovery pipe (513) and is located within the outer cylinder (511), a heat conducting plate (515) is fixedly connected within the outer cylinder (511), and a plurality of heat dissipation fins (516) are fixedly connected outside the heat conducting plate (515); The driving assembly (52) includes a rotating shaft (521), a connecting frame (522) is fixedly connected outside the rotating shaft (521), the connecting frame (522) is respectively fixedly connected to three isolation sleeves (523), and sealing grooves (524) are provided above and below the three isolation sleeves (523). The three isolation sleeves (523) are snap-fitted with six sealing sleeves (525) through the sealing grooves (524), the isolation sleeves (523) are rotatably connected within the sealing sleeves (525), and a plurality of flow guiding plates (526) are fixedly connected within the three isolation sleeves (523); The collection component (53) includes a mounting frame (531), a connecting cylinder (532) is fixedly connected to the outside of the mounting frame (531), three driving plates (533) are fixedly connected inside the connecting cylinder (532), and a solid catalyst (534) is fixedly connected above each of the three driving plates (533). Above the driving plate (533) is a mold with holes. The solid catalyst (534) is located in the mold above the driving plate (533). A number of reaction holes (535) are formed above the solid catalyst (534), and a number of diversion grooves (536) are formed above the solid catalyst (534). A number of the diversion grooves (536) are all designed to be inclined. Above the driving plate (533) is an inclined groove (537). Four feeding holes (538) are formed above the driving plate (533), and a baffle (539) is fixedly connected to the outside of each of the four feeding holes (538). The isolation component (54) includes a collection cover (541). A number of steam holes (542) are formed above the collection cover (541). The upper part of the collection cover (541) is designed to be conical. A number of through holes (543) are formed below the collection cover (541). The lower part of the collection cover (541) is lapped with an isolation cover (544). A placement hole (545) is formed below the isolation cover (544). A positioning frame (546) is fixedly connected to the lower part of the collection cover (541).

2. The gasoline catalytic distillation desulfurization device according to claim 1, wherein The sealing component (51) is in transmission connection with the driving component (52), the driving component (52) is in transmission connection with the collection component (53), the collection component (53) is lapped with a number of isolation components (54), the collection component (53) is respectively communicated with a number of discharge pipes (55), the isolation component (54) is fixedly connected to the discharge pipe (55), and the discharge pipe (55) is fixedly connected to the sealing component (51).

3. The gasoline catalytic distillation desulfurization device according to claim 2, characterized in that, The driving component (52) is clamped outside the outer cylinder (511). A number of heat dissipation fins (516) are located inside the driving component (52). The discharge pipe (55) is fixedly connected to the outer cylinder (511). The top end of the driving component (52) is fixedly connected to the sealing plate (512).

4. The gasoline catalytic distillation desulfurization device according to claim 3, characterized in that, The top end of the rotating shaft (521) is in transmission connection with the output shaft below the motor (514). The connecting frame (522) is fixedly connected to the sealing plate (512). Six sealing sleeves (525) are all fixedly connected outside the outer cylinder (511).

5. The gasoline catalytic distillation desulfurization device according to claim 4, characterized in that, The mounting frame (531) is fixedly connected to the bottom end of the rotating shaft (521). The upper parts of a number of the solid catalysts (534) are respectively lapped with the lower parts of a number of isolation components (54). A sealing bearing is clamped below the driving plate (533). The driving plate (533) is sleeved outside the discharge pipe (55) through the sealing bearing.

6. The gasoline catalytic distillation desulfurization device according to claim 5, characterized in that The collection hood (541) is fixedly connected to the inner wall of the discharge pipe (55) through a positioning frame (546). The isolation hood (544) is fixedly connected to the connecting cylinder (532). The shape of the upper part of the isolation hood (544) is adapted to the shape of the lower part of the collection hood (541). The isolation hood (544) adopts a semi-circular design. The positioning frame (546) is located in the placement hole (545).

7. A gasoline catalytic distillation desulfurization method, according to a gasoline catalytic distillation desulfurization device as claimed in claim 6, characterized in that, It includes the following processing steps: S1. The raw gasoline is cut into light fractions and heavy fractions by a fractionating tower (1); S1.

1. Through a light fraction tower (2), the light fractions are directly used as light gasoline products after caustic washing or mercaptan desulfurization treatment; S1.

2. Through a heavy fraction tower (3), the heavy fractions enter a pre-hydrogenation reactor (4) to saturate dienes and partially convert mercaptans; S2. In a catalytic distillation column (5), chemical reactions and separation functions are carried out to make mercaptans react and be converted into other compounds, thereby achieving partial conversion of mercaptans. Different raw materials with different concentrations can be processed by relying on different isolation components (54) and collection components (53), or gasoline, diesel and other products can be separately processed from the raw materials; S3. The light components and hydrogen sulfide generated at the top of the tower are condensed and separated, and the hydrogen sulfide is recovered and treated; S4. The bottom product of the tower enters a stabilizing tower, and a blended gasoline product is obtained after further separation.

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