A beta-aminopropionitrile purification apparatus
By using high-temperature steam from the top of a distillation column to preheat the mixture and remove ammonia in the β-aminopropionitrile purification unit, the problem of high energy consumption in the prior art is solved, achieving efficient energy utilization and reduced waste of raw materials.
Patent Information
- Application Number
- CN202310368096.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-04-08
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2043-04-08
AI Technical Summary
In the preparation of β-aminopropionitrile, the existing technology consumes a lot of energy during the purification process in the distillation column, and the high-temperature steam cooling liquefaction process also consumes a lot of energy.
A β-aminopropionitrile purification device is designed, which uses high-temperature steam at the top of the distillation tower to preheat the mixture and remove ammonia. Through the circulation process of heat exchange box and ammonia removal box, the preheating and ammonia removal of the mixture are realized, reducing energy consumption.
By recycling the heat from high-temperature steam, the company's energy consumption was reduced, and ammonia in the mixture was effectively removed, reducing raw material waste.
Smart Images
Figure CN116459539B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of purification device, in particular to a beta-amino propionitrile purification device. BACKGROUND
[0002] In the preparation of beta-amino propionitrile by using acrylonitrile, the mixture generated by the reaction needs to be heated first to make the unreacted ammonia in the mixture overflow, thereby reducing the ammonia smell in the 3-amino propionitrile product, and then the ammonia-removed mixture is introduced into the distillation column for purification. This way of removing ammonia by heating the mixture alone is energy-consuming, and in order to improve the purification efficiency of the distillation column, the mixture is usually heated in advance, which is also energy-consuming. When the distillation column is purifying the mixture, the high-temperature steam from the top of the distillation column is usually introduced into the condenser for cooling and liquefaction, thereby obtaining the 3-amino propionitrile product. The condenser also needs to consume a large amount of energy when cooling and liquefying the high-temperature steam. SUMMARY
[0003] In view of the problems in the above background art, the main purpose of the present application is to provide a beta-amino propionitrile purification device. When using the device to purify 3-amino propionitrile, the energy carried by the high-temperature steam from the top of the distillation column can be used to preheat the mixture, and at the same time, the ammonia in the mixture can be removed, thereby achieving the purpose of reducing energy consumption of enterprises.
[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:
[0005] A beta-amino propionitrile purification device, comprising a distillation column, a steam outlet pipe is arranged at the middle position of the top of the distillation column, the steam outlet pipe is connected to a heat exchange box, the heat exchange box is installed on a first mounting plate, the right end of the first mounting plate is fixedly connected with the distillation column, a first discharge pipe is arranged at the bottom of the left side wall of the heat exchange box, a reflux pipe is arranged at the bottom of the heat exchange box, the reflux pipe is connected to the distillation column, a first serpentine pipe is arranged in the heat exchange box, one end of the first serpentine pipe penetrates through the top wall of the heat exchange box and is connected with a mixture feed pipe, the other end of the first serpentine pipe penetrates through the bottom wall of the heat exchange box and the first mounting plate and is connected with a connecting pipe, one end of the connecting pipe extends into an ammonia removal box, the ammonia removal box is installed on a second mounting plate, the right end of the second mounting plate is fixedly connected with the distillation column, a second discharge pipe is arranged at the bottom of the ammonia removal box, the second discharge pipe is connected to the distillation column, and an exhaust pipe is arranged at the top of the ammonia removal box.
[0006] The 3-aminopropionitrile low-temperature mixture generated by the reaction is fed into the first serpentine tube through the mixture feeding pipe, then into the ammonia removal tank through the connecting pipe, then into the distillation column through the second discharge pipe, and then the mixture falls into the bottom of the distillation column through the overflow plate. A second heating element is also provided at the bottom of the distillation column to heat and purify the mixture. The 3-aminopropionitrile in the mixture is vaporized by heat and rises to the top of the distillation column as high-temperature steam, then enters the heat exchange tank through the steam discharge pipe to exchange heat with the low-temperature mixture flowing through the first serpentine tube, thereby liquefying the high-temperature steam and heating the low-temperature mixture. Part of the liquefied 3-aminopropionitrile is discharged through the first discharge pipe, and the other part reenters the distillation column through the reflux pipe. The heated mixture enters the ammonia removal tank through the connecting pipe, and part of the ammonia in the mixture is released. The mixture in the ammonia removal tank enters the distillation column through the second discharge pipe, forming a cycle to remove ammonia from the mixture using high-temperature steam, thereby reducing energy consumption.
[0007] Preferably, the heat exchange tank also has a second serpentine tube and a pressure sensor. One end of the second serpentine tube passes through the top wall of the heat exchange tank and is connected to the refrigerant feeding pipe. The other end of the second serpentine tube passes through the left side wall of the heat exchange tank and is connected to the refrigerant discharge pipe.
[0008] By providing a second serpentine tube and a pressure sensor, the pressure in the heat exchange tank can be prevented from being too high when the first serpentine tube is insufficient to liquefy the high-temperature steam, causing safety hazards. When the first serpentine tube is insufficient to liquefy the high-temperature steam, the pressure in the heat exchange tank gradually rises. When it reaches the upper limit set by the pressure sensor, the pressure sensor sends an alarm. At this time, the valve on the refrigerant feeding pipe is opened, and refrigerant is introduced into the second serpentine tube through the refrigerant feeding pipe to accelerate the liquefaction of the high-temperature steam in the heat exchange tank. When the pressure in the heat exchange tank reaches the lower limit of the pressure sensor, the valve on the refrigerant feeding pipe is closed, and the introduction of refrigerant into the second serpentine tube is stopped, thereby maximizing the use of the energy carried by the high-temperature steam.
[0009] Preferably, the ammonia removal tank has a first heating element, and the top of the ammonia removal tank has an exhaust pipe.
[0010] After the mixture entering the ammonia removal tank is further heated by the first heating element, the ammonia in the mixture is further released, thereby further achieving the purpose of ammonia removal.
[0011] Preferably, the top of the ammonia removal tank has an arc-shaped gas collection hood, and the exhaust pipe has an exhaust fan.
[0012] The top of the ammonia removal tank is designed with an arc-shaped cross-section, which is beneficial for collecting ammonia. The exhaust fan can accelerate the discharge of ammonia from the ammonia removal tank.
[0013] Preferably, the first heating element is annular, and a stirring shaft is arranged at a middle position of the first heating element, and stirring blades are arranged on the stirring shaft, and the stirring shaft extends out of a bottom wall of the ammonia removal tank and is connected with the motor.
[0014] By arranging the stirring shaft, the speed of ammonia overflowing from the mixture can be accelerated when the stirring shaft rotates, and the temperature of the mixture can be more uniform, thereby being more conducive to the purification of 3-aminopropionitrile.
[0015] Preferably, the other end of the exhaust pipe is connected with the water storage tank.
[0016] By connecting the exhaust pipe with the water storage tank, the ammonia discharged from the ammonia removal tank can enter the water storage tank through the exhaust pipe, and can be made into ammonia water for recycling, thereby reducing the waste of raw materials.
[0017] Compared with the prior art, the present application has the following beneficial effects:
[0018] 1. The low-temperature mixture of 3-aminopropionitrile generated by reaction enters the first serpentine pipe through the mixture feeding pipe, then enters the ammonia removal tank through the connecting pipe, then enters the distillation column through the second discharge pipe, and then the mixture falls into the bottom of the distillation column through the overflow plate. A second heating element is also arranged at the bottom of the distillation column, which heats and purifies the mixture. The 3-aminopropionitrile in the mixture is vaporized into high-temperature steam by heating, which rises to the top of the distillation column, then enters the heat exchange tank through the steam outlet pipe, and exchanges heat with the low-temperature mixture flowing in the first serpentine pipe, thereby liquefying the high-temperature steam and heating the low-temperature mixture. Part of the 3-aminopropionitrile generated after liquefaction is discharged through the first discharge pipe, and the other part reenters the distillation column through the reflux pipe. The heated mixture enters the ammonia removal tank through the connecting pipe, and part of the ammonia in the mixture is released. The mixture in the ammonia removal tank enters the distillation column through the second discharge pipe, thereby forming a cycle, so as to achieve the purpose of removing ammonia from the mixture by using high-temperature steam, thereby reducing the energy consumption of enterprises.
[0019] 2. By arranging the second serpentine pipe and the pressure sensor, the safety hazard caused by excessive pressure in the heat exchange tank when the liquefaction capacity of the first serpentine pipe for high-temperature steam is insufficient can be prevented. When the liquefaction capacity of the first serpentine pipe for high-temperature steam is insufficient, the pressure in the heat exchange tank gradually rises. When it reaches the upper limit value set by the pressure sensor, the pressure sensor sends an alarm. At this time, the valve on the refrigerant feeding pipe is opened, and refrigerant is introduced into the second serpentine pipe through the refrigerant feeding pipe to accelerate the liquefaction speed of the high-temperature steam in the heat exchange tank. When the pressure in the heat exchange tank reaches the lower limit value set by the pressure sensor, the valve on the refrigerant feeding pipe is closed, and the introduction of refrigerant into the second serpentine pipe is stopped, thereby achieving the maximum utilization of the energy carried by the high-temperature steam.
[0020] 3. By connecting the exhaust pipe with the water storage tank, the ammonia gas discharged from the ammonia driving box enters the water storage tank through the exhaust pipe, and ammonia water can be prepared for reuse, thereby reducing raw material waste. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is a schematic diagram of the overall structure of the β-amino propionitrile purification device of the present application.
[0022] Figure 2 It is a schematic diagram of the structure of the first coiled pipe of the present application.
[0023] Figure 3 It is a schematic diagram of the structure of the second coiled pipe of the present application.
[0024] Figure 4 It is a top view of the heat exchange box of the present application.
[0025] Figure 5 It is a schematic diagram of the structure of the ammonia driving box of the present application.
[0026] Figure 6 It is a top view of the ammonia driving box of the present application.
[0027] In the figure: 1, distillation column; 2, steam outlet pipe; 3, heat exchange box; 31, mixture feeding pipe; 32, first coiled pipe; 33, coolant feeding pipe; 34, second coiled pipe; 35, coolant discharging pipe; 36, pressure sensor; 4, first discharging pipe; 5, first mounting plate; 6, reflux pipe; 7, connecting pipe; 8, ammonia driving box; 81, first heating element; 82, gas collection hood; 83, exhaust fan; 84, exhaust pipe; 9, second mounting plate; 10, second discharging pipe; 11, overflow plate; 12, second heating element; 13, third discharging pipe. DETAILED DESCRIPTION
[0028] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the present application will be further described below in conjunction with specific embodiments.
[0029] As Figure 1As shown, a kind of β-amino propionitrile purification device, including distillation column 1, the middle position of the top of the distillation column 1 is equipped with steam outlet pipe 2, the steam outlet pipe 2 is communicated with heat exchange box 3, the heat exchange box 3 is installed on the first mounting plate 5, the right end of the first mounting plate 5 is fixedly connected with the distillation column 1, the left side wall bottom of the heat exchange box 3 is equipped with first discharge pipe 4, the bottom of the heat exchange box 3 is equipped with reflux pipe 6, the reflux pipe 6 is communicated with the distillation column 1, the first serpentine pipe 32 is arranged in the heat exchange box 3, one end of the first serpentine pipe 32 passes through the top wall of the heat exchange box 3 and is connected with mixture feed pipe 31, the other end of the first serpentine pipe 32 passes through the bottom wall of the heat exchange box 3 and the first mounting plate 5 and is connected with connecting pipe 7, one end of the connecting pipe 7 extends into ammonia removal tank 8, the ammonia removal tank 8 is installed on the second mounting plate 9, the right end of the second mounting plate 9 is fixedly connected with the distillation column 1, the bottom of the ammonia removal tank 8 is equipped with second discharge pipe 10, the second discharge pipe 10 is communicated with the distillation column 1, the top of the ammonia removal tank 8 is equipped with exhaust pipe 84.
[0030] The low-temperature mixture of 3-aminopropionitrile generated by reaction enters the first serpentine pipe 32 through the mixture feed pipe 31, then enters the ammonia removal tank 8 through the connecting pipe 7, then enters the distillation column 1 through the second discharge pipe 10, and then the mixture falls into the bottom of the distillation column 1 through the overflow plate 11. A second heating element 12 is also arranged at the bottom of the distillation column 1. The second heating element 12 heats and purifies the mixture. The 3-aminopropionitrile in the mixture is vaporized by heat and rises to the top of the distillation column 1 as high-temperature steam, then enters the heat exchange box 3 through the steam outlet pipe 2, and exchanges heat with the low-temperature mixture flowing in the first serpentine pipe 31, so that the high-temperature steam is liquefied, and the low-temperature mixture is heated at the same time. Part of the liquefied 3-aminopropionitrile is discharged through the first discharge pipe 4, and the other part reenters the distillation column 1 through the reflux pipe 6. The heated mixture enters the ammonia removal tank 8 through the connecting pipe 7, and part of the ammonia in the mixture is released. The mixture in the ammonia removal tank 8 enters the distillation column 1 from the second discharge pipe 10, forming a cycle, so as to achieve the purpose of removing ammonia from the mixture by using high-temperature steam, thereby reducing the energy consumption of enterprises.
[0031] Further, the heat exchange box 3 is also provided with a second serpentine pipe 34 and a pressure sensor 36. One end of the second serpentine pipe 34 passes through the top wall of the heat exchange box 3 and is connected with refrigerant feed pipe 33. The other end of the second serpentine pipe 34 passes through the left side wall of the heat exchange box 3 and is connected with refrigerant discharge pipe 35.
[0032] By setting the second serpentine pipe 34 and the pressure sensor 36 in the heat exchange box 3, the safety hazard caused by excessive pressure in the heat exchange box 3 when the liquefaction capacity of the first serpentine pipe 31 to high-temperature steam is insufficient can be prevented. When the liquefaction capacity of the first serpentine pipe 31 to high-temperature steam is insufficient, the pressure in the heat exchange box 3 gradually rises, and when it reaches the upper limit set by the pressure sensor 36, the pressure sensor 36 sends an alarm, at which time the valve on the refrigerant feeding pipe 33 is opened, and the refrigerant is fed into the second serpentine pipe 34 through the refrigerant feeding pipe 33 to accelerate the liquefaction speed of the high-temperature steam in the heat exchange box 3, and when the pressure in the heat exchange box 3 reaches the lower limit set by the pressure sensor 36, the valve on the refrigerant feeding pipe 33 is closed, and the feeding of the refrigerant into the second serpentine pipe 34 is stopped, so as to achieve the maximum utilization of the energy carried by the high-temperature steam.
[0033] Further, the ammonia removal tank 8 is provided with a first heating element 81, and the top of the ammonia removal tank 8 is provided with an exhaust pipe 84.
[0034] After the mixture entering the ammonia removal tank 8 is further heated by the first heating element 81, the ammonia gas in the mixture is further released, thereby further achieving the purpose of ammonia removal.
[0035] Further, the top of the ammonia removal tank 3 is provided with an arc-shaped gas collecting hood 82, and the exhaust pipe 84 is provided with an exhaust fan 83.
[0036] The top of the ammonia removal tank 8 is provided with an arc-shaped gas collecting hood 82, which is conducive to the collection of ammonia gas, and the exhaust fan 83 can accelerate the exhaust speed of the ammonia gas in the ammonia removal tank 8.
[0037] Further, the first heating element 81 is annular, a stirring shaft 85 is arranged at the middle position of the first heating element 81, stirring blades are arranged on the stirring shaft 85, and the bottom end of the stirring shaft 85 extends out of the bottom wall of the ammonia removal tank 8 and is connected with a motor.
[0038] By arranging the stirring shaft 85, the stirring shaft 85 can accelerate the overflow speed of the ammonia gas from the mixture when rotating, and the rotation of the stirring shaft 85 can also make the temperature of the mixture more uniform, thereby being more conducive to the purification of 3-aminopropionitrile.
[0039] Further, the other end of the exhaust pipe 84 is connected with a water storage tank.
[0040] By connecting the exhaust pipe 84 with the water storage tank, the ammonia gas discharged from the ammonia removal tank 8 enters the water storage tank through the exhaust pipe 84, and can be made into ammonia water for reuse, thereby reducing the waste of raw materials.
[0041] The working principle of the beta-amino propionitrile purification device is as follows: when in use, the 3-amino propionitrile low-temperature mixture generated by reaction is introduced into the first serpentine pipe 31 through the mixture feeding pipe 31, and then introduced into the ammonia removal tank 8 through the connecting pipe 7. The first heating element 81 in the ammonia removal tank 8 preheats the mixture. The motor (not shown in the figure) is started, and the motor drives the stirring shaft 85 to rotate, thereby stirring the mixture and making the temperature of the mixture more uniform. Then the preheated mixture is introduced into the distillation tower 1 through the second discharge pipe 10. Then the mixture falls into the bottom of the distillation tower 1 through the overflow plate 11, and the second heating element 12 arranged at the bottom of the distillation tower 1 heats and purifies the mixture. The 3-amino propionitrile in the mixture is heated and evaporated into high-temperature steam, which rises to the top of the distillation tower 1. Then the high-temperature steam is introduced into the heat exchange tank 3 through the steam outlet pipe 2, exchanges heat with the low-temperature mixture flowing through the first serpentine pipe 31, thereby liquefying the high-temperature steam and heating the low-temperature mixture. Part of the 3-amino propionitrile liquefied is discharged through the first discharge pipe 4, and the other part is introduced into the distillation tower 1 through the reflux pipe 6 for purification. When the liquefaction capacity of the first serpentine pipe 31 for the high-temperature steam is insufficient, the pressure in the heat exchange tank 3 gradually increases. When the pressure reaches the upper limit set by the pressure sensor 36, the pressure sensor 36 sends an alarm. At this time, the valve on the refrigerant feeding pipe 33 is opened, and the refrigerant is introduced into the second serpentine pipe 34 through the refrigerant feeding pipe 33, thereby accelerating the liquefaction speed of the high-temperature steam in the heat exchange tank 3. When the pressure in the heat exchange tank 3 reaches the lower limit set by the pressure sensor 36, the valve on the refrigerant feeding pipe 33 is closed, and the introduction of the refrigerant into the second serpentine pipe 34 is stopped, thereby maximizing the use of the energy carried by the high-temperature steam. Then the mixture is introduced into the ammonia removal tank 8 through the connecting pipe 7. The first heating element 81 in the ammonia removal tank 8 further heats the mixture, thereby promoting the release of ammonia gas in the mixture. The released ammonia gas rises into the gas collection hood 82, and then the exhaust fan 83 sucks the ammonia gas into the exhaust pipe 84. The ammonia gas in the exhaust pipe 84 is sent to the water storage tank (not shown in the figure) to produce ammonia water. The heated mixture in the ammonia removal tank 8 is introduced into the distillation tower 1 through the second discharge pipe 10, thereby forming a cycle, thereby achieving the purpose of removing ammonia from the mixture by using high-temperature steam, thereby reducing the energy consumption of the enterprise. When there are more heavy components in the bottom of the distillation tower 1, they can be discharged through the third discharge pipe 13.
[0042] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.
Claims
1. A β-aminopropionitrile purification apparatus, comprising a distillation column (1), characterized in that: A steam outlet pipe (2) is provided at the middle of the top of the distillation column (1). The steam outlet pipe (2) is connected to a heat exchange box (3). The heat exchange box (3) is installed on a first mounting plate (5). The right end of the first mounting plate (5) is fixedly connected to the distillation column (1). A first discharge pipe (4) is provided at the bottom of the left side wall of the heat exchange box (3). A reflux pipe (6) is provided at the bottom of the heat exchange box (3). The reflux pipe (6) is connected to the distillation column (1). A first serpentine tube (32) is provided inside the heat exchange box (3). One end of the first serpentine tube (32) passes through the heat exchange box. (3) The top wall is connected to the mixture feed pipe (31). The other end of the first serpentine pipe (32) passes through the bottom wall of the heat exchange box (3) and the first mounting plate (5) and is connected to the connecting pipe (7). One end of the connecting pipe (7) extends into the ammonia removal box (8). The ammonia removal box (8) is installed on the second mounting plate (9). The right end of the second mounting plate (9) is fixedly connected to the distillation tower (1). The bottom of the ammonia removal box (8) is provided with a second discharge pipe (10). The second discharge pipe (10) is connected to the distillation tower (1). The top of the ammonia removal box (8) is provided with an exhaust pipe (84).
2. The β-aminopropionitrile purification apparatus according to claim 1, characterized in that: The heat exchange box (3) is also equipped with a second serpentine tube (34) and a pressure sensor (36). One end of the second serpentine tube (34) passes through the top wall of the heat exchange box (3) and is connected to the refrigerant inlet pipe (33). The other end of the second serpentine tube (34) passes through the left side wall of the heat exchange box (3) and is connected to the refrigerant outlet pipe (35).
3. The β-aminopropionitrile purification apparatus according to claim 1, characterized in that: The ammonia removal box (8) is equipped with a first heating element (81), and the top of the ammonia removal box (8) is equipped with an exhaust pipe (84).
4. The β-aminopropionitrile purification apparatus according to claim 3, characterized in that: The top of the ammonia removal box (3) is provided with an arc-shaped gas collection hood (82), and the exhaust pipe (84) is provided with an exhaust fan (83).
5. The β-aminopropionitrile purification apparatus according to claim 3, characterized in that: The first heating element (81) is annular, and a stirring shaft (85) is provided in the middle of the first heating element (81). The stirring shaft (85) is provided with stirring blades, and the bottom end of the stirring shaft (85) extends out of the bottom wall of the ammonia removal box (8) and is connected to the motor.
6. The β-aminopropionitrile purification apparatus according to claim 3, characterized in that: The other end of the exhaust pipe (84) is connected to the water storage tank.
Citation Information
Patent Citations
N, n-dimethyl-1,3-diaminopropane (DMAPA) synthesising method
CN101321722A
Low-temperature evaporation equipment of intelligent reaction kettle for fiber reinforced polymer composite material
CN215084917U