Rectification device for synthesizing adiponitrile through acrylonitrile electrolytic dimerization

Abstract

The rectification device comprises a rectification tower body, a feeding pipe is installed in the middle of one side of the rectification tower body, a backflow pipe is installed above the other side of the rectification tower body, and a steam exhaust pipe and a liquid drainage pipe are installed at the top and the bottom of the rectification tower body respectively. Displacement control assemblies used for controlling displacement are arranged in the feeding pipe, the backflow pipe, the steam exhaust pipe and the liquid discharge pipe, each displacement control assembly comprises a fixed discharge plate, an adjustable discharge plate and a driving structure used for controlling the position of the adjustable discharge plate, and the fixed discharge plates are fixedly installed on the inner walls of the feeding pipe, the backflow pipe, the steam exhaust pipe and the liquid discharge pipe; according to the utility model, the feeding and discharging quantity of materials in the rectifying tower can be controlled through the discharging quantity control assemblies on the pipelines, so that the pressure difference in the rectifying tower can be ensured to be within a safe range, and the safety of the rectifying tower can be ensured to be good when the rectifying tower is used.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile. Background Art

[0002] Acrylonitrile can generate adiponitrile through electrolytic dimerization. In order to ensure the product precision, it is generally necessary to use a distillation tower for distillation after production. The operation of the distillation tower should master the material balance, gas-liquid phase balance and heat balance. Material balance means that the amount of material entering the tower per unit time should be equal to the sum of the amount of materials leaving the tower. Material balance reflects the production capacity of the tower, which is mainly adjusted by the feed amount and the discharge amount at the top and bottom of the tower. When the operation of the tower does not meet the overall material balance, it can be reflected from the change of the tower pressure difference. For example, if more is fed in and less is discharged, the tower pressure difference will rise. For a fixed distillation tower, the tower pressure difference should be within a certain range. If the tower pressure difference is too large, the speed of the rising steam in the tower is too large, the mist entrainment is serious, and even flooding occurs, which destroys the normal operation; if the tower pressure difference is too small, the speed of the rising steam in the tower is too small, the gas-liquid two-phase mass transfer effect on the tower plate is reduced, and even leakage occurs, which greatly reduces the tower plate efficiency.

[0003] After searching, the Chinese patent with announcement number: CN213285717U discloses a new type of distillation tower, including a tower wall body, an external tool transmission device, a gravity potential energy power generation device and an operation button. The utility model belongs to the technical field of chemical equipment, specifically refers to a new type of distillation tower, which is provided with a corrugated gas-liquid mixing plate in the tower wall body, which can increase the gas-liquid contact area and increase the reaction amount.

[0004] When this patent is actually used, it has the following defects:

[0005] In this patent, the amount of material in and out of the distillation tower cannot be flexibly controlled. When the internal tower pressure difference is not within the appropriate range, the tower body is easily damaged. Utility Model Content

[0006] In view of the technical problem in the existing patents that the material inlet and outlet amounts in the distillation tower cannot be flexibly controlled and the tower body is easily damaged when the internal tower pressure difference is not within an appropriate range, the utility model provides a distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile.

[0007] The technical scheme adopted by the utility model is: a distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile, comprising a distillation tower body, a feed pipe is installed at the middle position of one side of the distillation tower body and a reflux pipe is installed at the upper position of the other side, an exhaust pipe and a liquid discharge pipe are installed at the top and bottom of the distillation tower body respectively, a displacement control component for controlling the displacement size is arranged in the feed pipe, the reflux pipe, the exhaust pipe and the liquid discharge pipe, the displacement control component comprises a fixed discharge plate, an adjustable discharge plate and a driving structure for controlling the position of the adjustable discharge plate, the fixed discharge plate is fixedly installed on the inner walls of the feed pipe, the reflux pipe, the exhaust pipe and the liquid discharge pipe, and the adjustable discharge plate is closely attached to one side of the fixed discharge plate.

[0008] Furthermore, three discharge ports are evenly arranged on the fixed discharge plate, and flow control ports corresponding to the discharge ports are arranged on the adjustable discharge plate.

[0009] Furthermore, the driving structure includes a driving motor, a brake gear and a gear ring. The feed pipe, the reflux pipe, the exhaust pipe and the discharge pipe are all provided with a receiving groove and an opening is provided on one side of the receiving groove. The gear ring is located in the receiving groove and is welded to the outside of the adjusting discharge plate. A mounting plate is installed on the outside of the opening. The driving motor is installed on one side of the mounting plate, and the brake gear is installed on the output shaft of the driving motor.

[0010] Furthermore, sealing rings are installed on both sides of the gear ring, and sealing grooves are opened on both sides of the inner wall of the accommodating groove, and the sealing rings are clamped in the sealing grooves.

[0011] Furthermore, a pressure detector is provided on one side of the distillation tower body.

[0012] Furthermore, a plate structure is installed in the distillation tower, an overflow weir is welded at one end of the plate structure, and a bubble tower is arranged on the plate structure.

[0013] Furthermore, a steam inlet pipe is installed at a lower position on the other side of the distillation tower body.

[0014] The beneficial effects of the utility model are as follows: compared with the prior art, in the utility model,

[0015] The utility model can control the inflow and outflow of materials in the distillation tower through the displacement control components on each pipeline, so that the pressure difference in the distillation tower can be guaranteed to be within a safe range, thereby ensuring good safety when the distillation tower is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 It is a cross-sectional view of the feed pipe of the utility model;

[0018] Figure 3 It is a left view of the displacement control assembly of the utility model;

[0019] Figure 4 It is a right view of the displacement control assembly of the utility model;

[0020] Figure 5 It is a cross-sectional view of the utility model.

[0021] The markings in the figure are: 1. distillation tower body; 2. feed pipe; 3. reflux pipe; 4. exhaust pipe; 5. discharge pipe; 6. displacement control assembly; 601. fixed discharge plate; 602. adjustable discharge plate; 7. drive structure; 701. drive motor; 702. brake gear; 703. gear ring; 8. discharge port; 9. flow control port; 10. mounting plate; 11. sealing ring; 12. sealing groove; 13. pressure detector; 14. tower plate structure; 15. overflow weir; 16. bubble tower; 17. steam inlet pipe. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be noted that the terms "front", "up", "down", "left", "right", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The following is combined with Figure 1-Figure 5 The utility model is further described.

[0025] In order to solve the problems existing in the background technology, the present application proposes the following technical solution: a distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile.

[0026] The specific technical scheme includes a distillation tower body 1, a feed pipe 2 is installed in the middle position of one side of the distillation tower body 1 and a reflux pipe 3 is installed at the upper position of the other side, an exhaust pipe 4 and a drain pipe 5 are installed at the top and bottom of the distillation tower body 1 respectively, wherein the feed pipe 2 and the reflux pipe 3 belong to the feed channel, and the exhaust pipe 4 and the drain pipe 5 belong to the discharge channel, and the feed pipe 2, the reflux pipe 3, the exhaust pipe 4 and the drain pipe 5 are all provided with a displacement control component 6 for controlling the displacement size, the displacement control component 6 includes a fixed discharge plate 601, an adjustable discharge plate 602 and a driving structure 7 for controlling the position of the adjustable discharge plate 602, and the displacement can be controlled by controlling the position of the adjustable discharge plate 602 through the driving structure 7, the fixed discharge plate 601 is fixedly installed on the inner walls of the feed pipe 2, the reflux pipe 3, the exhaust pipe 4 and the drain pipe 5, and the adjustable discharge plate 602 is tightly attached to one side of the fixed discharge plate 601.

[0027] Reference Figure 2-Figure 4 As shown, three discharge ports 8 are evenly arranged on the fixed discharge plate 601, and flow control ports 9 corresponding to the discharge ports 8 are arranged on the adjustable discharge plate 602. Liquid materials and gas materials can enter and exit the distillation tower only by passing through the discharge ports 8 and the flow control ports 9.

[0028] The driving structure 7 includes a driving motor 701, a braking gear 702 and a gear ring 703. The feed pipe 2, the reflux pipe 3, the exhaust pipe 4 and the discharge pipe 5 are all provided with a receiving groove and an opening is provided on one side of the receiving groove. The gear ring 703 is located in the receiving groove and welded to the outside of the regulating discharge plate 602. A mounting plate 10 is installed on the outside of the opening. The driving motor 701 is installed on one side of the mounting plate 10. The braking gear 702 is installed on the output shaft of the driving motor 701. When controlling the discharge amount, starting the driving motor 701 on the feed pipe 2 and the reflux pipe 3 can reduce the feed amount. The driving motor 701 can drive the braking gear 702 to rotate. The braking gear 702 can drive the gear ring 703 and the regulating discharge plate 602 to rotate. When the regulating discharge plate 602 rotates, the flow control port 9 and the discharge port 8 are staggered to reduce the discharge area, thereby reducing the feed amount. Similarly, when controlling the discharge amount, starting the driving motor 701 on the exhaust pipe 4 and the discharge pipe 5 can reduce the discharge amount.

[0029] Sealing rings 11 are installed on both sides of the gear ring 703, and sealing grooves 12 are opened on both sides of the inner wall of the accommodating groove. The sealing rings 11 are clamped in the sealing grooves 12. The sealing rings 11 can ensure good sealing between the discharge plate 602 and the inner wall of the pipeline when the position is adjusted, thereby preventing leakage.

[0030] Reference Figure 5As shown, a pressure detector 13 is provided on one side of the distillation tower body 1. The number of the pressure detectors 13 can be controlled according to the number of detection areas. The pressure detector 13 can detect the pressure value at each position in the distillation tower body 1, and the pressure difference can be used to determine whether the amount of material in and out of the tower is within an appropriate range.

[0031] A tray structure 14 is installed in the distillation tower. An overflow weir 15 is welded at one end of the tray structure 14 . A bubble cap tower 16 is arranged on the tray structure 14 . Gas-liquid contact can be easily achieved through the tray structure 14 .

[0032] Reference Figure 1 As shown, a steam inlet pipe 17 is installed at the lower position of the other side of the distillation tower body 1, and steam can be easily introduced into the distillation tower through the steam inlet pipe.

[0033] In order for those skilled in the art to fully understand the technical solution, this application makes the following overall summary:

[0034] When the utility model is in use, the feed pipe 2, the reflux pipe 3, the exhaust pipe 4 and the discharge pipe 5 are connected to various devices or pipelines respectively, the feed pipe 2 and the reflux pipe 3 belong to the feed channel, the exhaust pipe 4 and the discharge pipe 5 belong to the discharge channel, when gas-liquid contact is carried out in the distillation tower, the difference in the material inlet and outlet can be judged by observing the pressure detector 13, when the feed amount is too much, starting the drive motor 701 on the feed pipe 2 and the reflux pipe 3 when controlling the discharge amount can reduce the feed amount, the drive motor 701 can drive the brake gear 702 to rotate, the brake gear 702 can drive the gear ring 703 and the adjustment discharge plate 602 to rotate, when the adjustment discharge plate 602 rotates, the flow control port 9 and the discharge port 8 are staggered to reduce the discharge area, thereby reducing the feed amount, similarly, starting the drive motor 701 on the exhaust pipe 4 and the discharge pipe 5 when controlling the discharge amount can reduce the discharge amount, thereby ensuring the safety of the inside of the tower.

[0035] The standard parts used in the utility model can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0036] Although the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile, comprising a distillation tower body (1), characterized in that: A feed pipe (2) is installed at the middle position of one side of the distillation tower body (1), and a reflux pipe (3) is installed at the upper position of the other side. An exhaust pipe (4) and a liquid discharge pipe (5) are installed at the top and bottom of the distillation tower body (1), respectively. A displacement control component (6) for controlling the displacement is arranged in each of the feed pipe (2), the reflux pipe (3), the exhaust pipe (4) and the liquid discharge pipe (5). The displacement control component (6) comprises a fixed discharge plate (601), an adjustable discharge plate (602) and a driving structure (7) for controlling the position of the adjustable discharge plate (602). The fixed discharge plate (601) is fixedly installed on the inner walls of the feed pipe (2), the reflux pipe (3), the exhaust pipe (4) and the liquid discharge pipe (5), and the adjustable discharge plate (602) is closely attached to one side of the fixed discharge plate (601).

2. A distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 1, characterized in that: The fixed discharge plate (601) is evenly provided with three discharge ports (8), and the adjustable discharge plate (602) is provided with flow control ports (9) corresponding to the discharge ports (8).

3. A distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 1, characterized in that: The driving structure (7) comprises a driving motor (701), a braking gear (702) and a gear ring (703); the feed pipe (2), the reflux pipe (3), the exhaust pipe (4) and the liquid discharge pipe (5) are all provided with a receiving groove and an opening is provided on one side of the receiving groove; the gear ring (703) is located in the receiving groove and is welded to the outside of the regulating discharge plate (602); a mounting plate (10) is installed on the outside of the opening; the driving motor (701) is installed on one side of the mounting plate (10); and the braking gear (702) is installed on the output shaft of the driving motor (701).

4. A distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 3, characterized in that: Sealing rings (11) are installed on both sides of the gear ring (703), sealing grooves (12) are opened on both sides of the inner wall of the accommodating groove, and the sealing rings (11) are clamped in the sealing grooves (12).

5. A distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 1, characterized in that: A pressure detector (13) is provided on one side of the distillation tower body (1).

6. A distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 1, characterized in that: A tray structure (14) is installed in the distillation tower, an overflow weir (15) is welded to one end of the tray structure (14), and a bubble cap tower (16) is arranged on the tray structure (14).

7. A distillation device for synthesizing adiponitrile by electrolytic dimerization of acrylonitrile according to claim 1, characterized in that: A steam inlet pipe (17) is installed at a lower position on the other side of the distillation tower body (1).

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