Stabilizing tower for xylene production
By introducing a constant temperature chamber and pressure regulating structure into the stabilization tower for xylene production, and using a blower and pressure sensor to control the pressure balance inside the distillation tower, the problem of the influence of external steam pressure fluctuations on the tower was solved, and stable operation and efficient production of the distillation tower were achieved.
Patent Information
- Application Number
- CN202422832688.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-11-20
AI Technical Summary
When existing distillation columns are operating at high loads, fluctuations in external steam pressure affect heat transfer and separation efficiency within the column, leading to a decrease in product purity. Pressure replenishment and depressurization operations result in component loss and impact on production capacity.
A stabilization column for xylene production was designed, which uses components such as a constant temperature chamber, a circulating heater, a pressure sensor, and a blower. By controlling the pressure balance inside the distillation column, storing excess gas, and regulating the temperature, the column maintains stability by preventing external gases from entering directly.
This achieved stability of pressure and temperature within the distillation column, reduced the impact of external steam pressure on heat transfer and separation efficiency, ensured xylene production capacity and product quality, and reduced energy consumption loss.
Smart Images
Figure CN223542466U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of xylene production technology, specifically to a stabilizer tower for xylene production. Background Technology
[0002] Xylene is an organic compound with the molecular formula [formula missing]. It is a colorless and transparent liquid and is a product of the substitution of two hydrogen atoms on a benzene ring by a methyl group. It exists in three isomers: ortho, meta, and para. Industrially, xylene refers to a mixture of these isomers.
[0003] Xylene can be produced by distillation of fractions with a boiling range of 135–145°C, based on the different boiling points of the components in crude benzene. This process requires the use of a distillation column. Current distillation columns are frequently affected by fluctuations in external vapor pressure, especially under high-load operation, which directly leads to a decrease in product purity and results in load and product return operations. To ensure stable high-load operation of the unit, avoid product quality degradation, and save energy and material losses, related technologies typically control the pressure balance within the distillation column through pressurization and depressurization. However, pressurization allows external gas to enter the column, causing pressure fluctuations, while depressurization causes component loss, affecting xylene production capacity. Therefore, this application proposes a stabilization column for xylene production. Utility Model Content
[0004] This invention provides a stabilization tower for xylene production, which solves the problems mentioned in the background art, namely, that external vapor pressure affects the heat transfer and separation effect inside the tower; and that when the pressure balance inside the tower is controlled by pressure replenishment and pressure relief, external gas enters the tower during pressure replenishment, causing pressure fluctuations inside the tower, and component loss occurs during pressure relief, thus affecting the production capacity of xylene.
[0005] This utility model provides the following technical solution: a stabilizing tower for xylene production, including a constant temperature chamber, wherein a circulating heater, a temperature sensor and a distillation column are provided inside the constant temperature chamber, and air distribution plates are fixedly connected to the top and bottom of the constant temperature chamber. The air inlet of the circulating heater is connected to the air distribution plate located at the bottom of the constant temperature chamber through an air inlet pipe, and the air outlet of the circulating heater is connected to the air distribution plate located at the bottom of the constant temperature chamber through an air outlet pipe.
[0006] A pressure sensor is installed at the top of the inner cavity of the distillation column. A pressure regulating structure is also installed at the top of the distillation column. This structure includes a temporary storage chamber and a balancing chamber fixedly connected to the top of the distillation column. A lifting plate is connected to the top of the inner cavity of the temporary storage chamber via a spring. An upper limit plate and a lower limit plate are fixedly connected inside the inner cavity of the temporary storage chamber. The lifting plate is located between the upper and lower limit plates. An exhaust fan is fixedly connected to the bottom of the inner cavity of the temporary storage chamber. The air inlet of the exhaust fan extends to the top of the inner cavity of the distillation column via a pipe. The air outlet is located below the lifting plate. An exhaust fan is installed outside the temporary storage chamber. The air inlet of the exhaust fan extends to the bottom of the temporary storage chamber through a pipe. The air outlet of the exhaust fan is connected to the air inlet of the condenser of the distillation column. Liquid xylene is stored in the inner cavity of the balancing chamber. Heating rods are uniformly fixedly connected to the bottom of the balancing chamber. A cooler is fixedly connected to the top of the balancing chamber. The top of the balancing chamber is connected to the bottom of the temporary storage chamber through a connecting pipe. An electric ball valve is installed on one side of the top of the connecting pipe.
[0007] Preferably, the distillation column is provided with a feed pipe, a light component discharge pipe and a heavy component discharge pipe, the outer surfaces of which are all covered with heat insulation pads, and the ends of the feed pipe, light component discharge pipe and heavy component discharge pipe that are furthest from the distillation column are all located outside the constant temperature chamber.
[0008] Preferably, the connecting pipe includes a fixed-length pipe fixedly connected to one side of the bottom of the balance chamber, the top of the fixed-length pipe being above the liquid xylene, an electric ball valve fixedly connected to one side of the top of the fixed-length pipe, a telescopic pipe fixedly connected to the bottom of the fixed-length pipe, the bottom of the telescopic pipe being fixedly connected to the lifting plate, and the bottom of the telescopic pipe being at the same height as the bottom of the lifting plate.
[0009] Preferably, a pressure sensor two is fixedly connected to the bottom of the upper limit plate, and a pressure sensor three is fixedly connected to the top of the lower limit plate.
[0010] Preferably, the temperature sensor is fixedly connected to the air distribution plate located at the bottom of the constant temperature chamber.
[0011] Preferably, the outer surface of the constant temperature chamber is covered with an insulation pad, the top of the constant temperature chamber is fixedly connected to a heat sink, the cold end of the refrigerator is located inside the balance chamber, and the hot end of the refrigerator is fixedly connected to the heat sink.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] 1. This stabilizing column for xylene production utilizes an exhaust fan to extract the xylene gas distilled from the distillation column. The operating frequency of the exhaust fan is controlled to maintain a balanced pressure at the top of the distillation column. During pressure regulation, excess xylene gas in the distillation column can be stored in the balancing chamber to prevent xylene loss. The liquid xylene in the balancing chamber can be used to replenish the condenser of the distillation column, maintaining the stable operation of the condenser. This prevents external gases from directly entering the distillation column and causing pressure fluctuations at the top of the column, thus ensuring the stability of the distillation column's operation.
[0014] 2. The stabilization tower for xylene production, through the setting of a constant temperature chamber, can maintain a stable temperature in the constant temperature chamber during use, thereby reducing the impact of external vapor pressure on heat transfer and separation effect in the tower when producing xylene using the distillation tower, and ensuring the pressure stability in the distillation tower. Attached Figure Description
[0015] Figure 1 This is a front view of the structure of this utility model;
[0016] Figure 2 The structure of this utility model Figure 1 Internal diagram;
[0017] Figure 3 The structure of this utility model Figure 2 Frontal view of the diagram;
[0018] Figure 4 This is a schematic diagram of the internal structure of the voltage regulating structure of this utility model;
[0019] Figure 5 The structure of this utility model Figure 4 Frontal view of the diagram.
[0020] In the diagram: 1. Constant temperature chamber; 2. Light component discharge pipe; 3. Heavy component discharge pipe; 4. Feed pipe; 5. Heat sink; 6. Distillation column; 7. Temperature sensor; 8. Circulating heater; 9. Air outlet pipe; 10. Air inlet pipe; 11. Exhaust fan 2; 12. Temporary storage chamber; 13. Balance chamber; 14. Pressure sensor 1; 15. Lower limit plate; 16. Upper limit plate; 17. Telescopic pipe; 18. Spring; 19. Exhaust fan 1; 20. Electric ball valve; 21. Refrigerator; 22. Lifting plate; 23. Fixed length pipe; 24. Heating rod. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] This invention provides a stabilization column for xylene production, comprising a constant temperature chamber 1. The inner cavity of the constant temperature chamber 1 is equipped with a circulating heater 8, a temperature sensor 7, and a distillation column 6. Air distribution plates are fixedly connected to the top and bottom of the inner cavity of the constant temperature chamber 1. The air inlet of the circulating heater 8 is connected to the air distribution plate located at the bottom of the inner cavity of the constant temperature chamber 1 via an air inlet pipe 10, and the air outlet of the circulating heater 8 is connected to the air distribution plate located at the bottom of the inner cavity of the constant temperature chamber 1 via an air outlet pipe 9. The temperature sensor 7 is fixedly connected to the air distribution plate located at the bottom of the inner cavity of the constant temperature chamber 1. Through the setting of the temperature sensor 7, the temperature inside the constant temperature chamber 1 can be detected in real time. With the setting of the circulating heater 8, when energized, the air inside the constant temperature chamber 1 is heated by forced convection through a pump, so that the constant temperature inside the constant temperature chamber can be maintained during the use of the stabilization column. This reduces the impact of external vapor pressure on heat transfer and separation effect inside the column when producing xylene using the distillation column, and improves the pressure stability inside the distillation column. The distillation column 6 is prior art and will not be described in detail here.
[0023] The distillation column 6 is equipped with a feed pipe 4, a light component discharge pipe 2, and a heavy component discharge pipe 3. The outer surfaces of all three pipes are covered with insulating pads. The ends of these three pipes furthest from the distillation column 6 are located outside the constant temperature chamber 1, which is also covered with insulating pads. The use of insulating pads reduces heat loss and energy consumption in the distillation column. The insulating pads can be made of polyurethane (PU).
[0024] A pressure sensor 14 is installed at the top of the inner cavity of the distillation column 6, which allows for real-time monitoring of the pressure at the top of the column. The top of the distillation column 6 is equipped with a pressure regulating structure, which includes a temporary storage chamber 12 and a balancing chamber 13 fixedly connected to the top of the column. An exhaust fan 19 is fixedly connected to the bottom of the temporary storage chamber 12. The inlet of the exhaust fan 19 extends through a pipe to the top of the inner cavity of the distillation column 6, and the outlet of the exhaust fan 19 is located inside the temporary storage chamber 12. The exhaust fan 19 pumps gas from the distillation column 6 into the temporary storage chamber 12. Furthermore, during operation, the operating frequency of the exhaust fan 19 can be changed to remove excess gas from the distillation column 6, thus maintaining pressure balance within the column.
[0025] Springs 18 are evenly fixedly connected to the top of the inner cavity of the temporary storage chamber 12, and lifting plates 22 are fixedly connected to the bottom of the springs 18. The lifting plates 22 are located above the air outlet of the exhaust fan 19. The lifting plates 22 are movably connected to the inner cavity of the temporary storage chamber 12. The outer wall of the lifting plates 22 is sealed to the inner wall of the temporary storage chamber 12 by a sealing ring. The sealing ring can be made of rubber to improve the sealing performance between the lifting plates 22 and the temporary storage chamber 12.
[0026] With the lifting plate 22 and spring 18, when the pressure inside the temporary storage chamber 12 increases, the excess gas inside the temporary storage chamber 12 can compress the lifting plate 22, causing the lifting plate 22 to move upward, thereby increasing the distance between the lifting plate 22 and the bottom of the inner cavity of the temporary storage chamber 12, maintaining the pressure balance inside the temporary storage chamber 12. When the pressure inside the temporary storage chamber 12 decreases, the rebound force of the spring 18 can drive the lifting plate 22 to move downward, thereby decreasing the distance between the lifting plate 22 and the bottom of the inner cavity of the temporary storage chamber 12, maintaining the pressure balance inside the temporary storage chamber 12.
[0027] An upper limit plate 16 and a lower limit plate 15 are fixedly connected inside the inner cavity of the temporary storage chamber 12. The lifting plate 22 is located between the upper limit plate 16 and the lower limit plate 15. A pressure sensor 2 is fixedly connected to the bottom of the upper limit plate 16, and a pressure sensor 3 is fixedly connected to the top of the lower limit plate 15. With this configuration, the upper limit plate 16 can limit the lifting plate 22, and the lower limit plate 15 can limit the lifting plate 22. Based on the squeezing force of the lifting plate 22 on the pressure sensor 2 or the pressure sensor 3, it can be determined whether the pressure inside the temporary storage chamber 12 continues to increase or decrease.
[0028] An exhaust fan 2 11 is installed outside the temporary storage chamber 12. The air inlet of the exhaust fan 2 11 extends to the bottom of the inner cavity of the temporary storage chamber 12 through a pipe 2. The air outlet of the exhaust fan 2 11 is connected to the air inlet of the condenser of the distillation column 6. Through the installation of the exhaust fan 2 11, the operation of the exhaust fan 2 11 can pump the gas in the temporary storage chamber 12 into the condenser of the distillation column 6. Furthermore, when the stabilized column is in use, the exhaust fan 2 11 pumps the gas into the condenser of the distillation column 6 at a constant operating frequency.
[0029] Liquid xylene is stored inside the equilibrium chamber 13. Heating rods 24 are uniformly fixedly connected to the bottom of the equilibrium chamber 13. When the heating rods 24 are energized, their heating wires can dissipate heat to heat the liquid xylene, causing it to turn into a gas. A cooler 21 is fixedly connected to the top of the equilibrium chamber 13. A heat sink 5 is fixedly connected to the top of the constant temperature chamber 1. The heat sink 5 can be made of graphene. The cold end of the cooler 21 is located inside the equilibrium chamber 13, and the hot end of the cooler 21 is fixedly connected to the heat sink 5. The cooler 21 can cool the gas in the equilibrium chamber 13, causing the gaseous xylene to condense and facilitating the collection of excess xylene gas.
[0030] The top of the inner cavity of the balancing chamber 13 is connected to the bottom of the inner cavity of the temporary storage chamber 12 via a connecting pipe. An electric ball valve 20 is installed on one side of the top of the connecting pipe. The connecting pipe includes a fixed-length pipe 23 fixedly connected to one side of the bottom of the inner cavity of the balancing chamber 13. The top of the fixed-length pipe 23 is above the liquid xylene. The electric ball valve 20 is fixedly connected to one side of the top of the fixed-length pipe 23. A telescopic pipe 17 is fixedly connected to the bottom of the fixed-length pipe 23. The bottom of the telescopic pipe 17 is fixedly connected to the lifting plate 22, and the bottom of the telescopic pipe 17 is at the same height as the bottom of the lifting plate 22. Through the connecting pipe, when the electric ball valve 20 is open, the inner cavity of the temporary storage chamber 12 and the inner cavity of the balancing chamber 13 can be in communication. Excess gas in the temporary storage chamber 12 can enter the inner cavity of the balancing chamber 13, and xylene gas produced in the balancing chamber 13 can enter the temporary storage chamber 12. The telescopic pipe 17 can be made of corrugated pipe.
[0031] As described above regarding the pressure regulating structure, when the stabilizer is in use, the xylene gas distilled from the distillation column is extracted using the exhaust fan 19, and the operating frequency of the exhaust fan 19 is controlled to maintain a balanced pressure at the top of the distillation column 6. During the pressure regulating process, excess xylene gas in the distillation column 6 can be stored in the balance chamber 13 to ensure the production efficiency of xylene. The liquid xylene in the balance chamber 13 can be replenished to the condenser of the distillation column to maintain the stable operation of the condenser. This prevents external gases from directly entering the distillation column 6 and causing pressure fluctuations at the top of the distillation column 6, thus ensuring the stability of the operation of the distillation column 6.
[0032] All electrical components involved in this application are prior art. Those skilled in the art understand their connection methods. With the help of those skilled in the art, all electrical components in this application and their compatible power supplies can be connected by wires. According to the actual situation, a suitable controller can be selected to meet the control requirements. For specific connections and control sequences, please refer to the description below. The electrical connection between each electrical component is completed in the order of operation. The detailed connection methods are well known in the art. The following mainly introduces the working principle and process, and will not describe the electrical control.
[0033] In summary: When using this stabilization tower for xylene production, the crude benzene feedstock for xylene production is transported to the distillation tower 6 through the feed pipe 4. Based on the different boiling points of the components of crude benzene, the fraction with a boiling range of 135-145℃ is extracted by distillation to obtain xylene. The obtained xylene is discharged through the light component discharge pipe 2, and the heavy component is discharged through the heavy component discharge pipe 3. The distillation process of the crude benzene feedstock in the distillation tower 6 is existing technology and will not be described in detail here.
[0034] During the xylene production process, temperature sensor 7 monitors the temperature inside the constant temperature chamber 1 in real time and uses circulating heater 8 to heat the air, so that the air temperature inside the constant temperature chamber 1 remains constant, reducing the impact of external steam pressure on heat transfer and separation effect inside the column and improving the pressure stability inside the distillation column.
[0035] Pressure sensor 14 monitors the pressure at the top of distillation column 6 in real time. If the pressure at the top of distillation column 6 increases, the operating frequency of exhaust fan 19 is increased. Excess gas in distillation column 6 is removed by exhaust fan 19 to maintain the pressure stability in distillation column 6. Exhaust fan 19 discharges the gas in distillation column 6 into temporary storage chamber 12. Exhaust fan 21 blows the gas in temporary storage chamber 12 into the condenser of distillation column 6. The condenser condenses the xylene gas. A portion of the condensed liquid flows back into distillation column 6, and a portion of the condensed liquid is discharged through light component discharge pipe 2. When the gas in the temporary storage chamber 12 increases, the pressure balance in the temporary storage chamber 12 is adjusted by adjusting the distance between the lifting plate 22 and the bottom of the inner cavity of the temporary storage chamber 12. If the squeezing force of the lifting plate 22 on the pressure sensor 2 exceeds the set value, the amount of gas in the temporary storage chamber 12 is too much. The electric ball valve 20 opens, and the excess gas in the temporary storage chamber 12 enters the balance chamber 13. The cooler 21 works and condenses the gas. The excess gas is stored in the balance chamber 13.
[0036] If the pressure at the top of the distillation column 6 decreases, the operating frequency of the exhaust fan 19 is reduced. By reducing the amount of gas discharged, the pressure balance inside the distillation column 6 is maintained. Furthermore, the pressure balance inside the temporary storage chamber 12 is adjusted by lowering the lifting plate 22. When the pressure exerted by the lifting plate 22 on the pressure sensor 3 exceeds the set value, the amount of gas in the temporary storage chamber 12 becomes too small. The electric ball valve 20 opens, and the heating rod 24 is energized, dissipating heat to heat the liquid xylene, causing it to turn into gas. This gas then enters the temporary storage chamber 12 along the connecting pipe, maintaining the pressure balance inside the temporary storage chamber 12. This, in turn, keeps the amount of gas entering the condenser stable. During this process, external gas is prevented from directly entering the distillation column 6, causing pressure fluctuations at the top of the distillation column 6 and ensuring the stability of the distillation column 6's operation.
[0037] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.
Claims
1. A stabilization tower for xylene production, comprising a constant temperature chamber (1), characterized in that: The inner cavity of the constant temperature chamber (1) is equipped with a circulating heater (8), a temperature sensor (7) and a distillation column (6). The top and bottom of the inner cavity of the constant temperature chamber (1) are fixedly connected with air distribution plates. The air inlet of the circulating heater (8) is connected to the air distribution plate located at the bottom of the inner cavity of the constant temperature chamber (1) through an air inlet pipe (10). The air outlet of the circulating heater (8) is connected to the air distribution plate located at the bottom of the inner cavity of the constant temperature chamber (1) through an air outlet pipe (9). A pressure sensor (14) is provided at the top of the inner cavity of the distillation column (6). A pressure regulating structure is provided at the top of the distillation column (6). The pressure regulating structure includes a temporary storage chamber (12) and a balance chamber (13) fixedly connected to the top of the distillation column (6). A lifting plate (22) is connected to the top of the inner cavity of the temporary storage chamber (12) by a spring (18). An upper limit plate (16) and a lower limit plate (15) are fixedly connected inside the inner cavity of the temporary storage chamber (12). The lifting plate (22) is located between the upper limit plate (16) and the lower limit plate (15). A fan (19) is fixedly connected to the bottom of the inner cavity of the temporary storage chamber (12). The air inlet of the fan (19) extends to the top of the inner cavity of the distillation column (6) through a pipe. The air outlet of fan 1 (19) is located below the lifting plate (22). The outside of the temporary storage chamber (12) is provided with exhaust fan 2 (11). The air inlet of exhaust fan 2 (11) extends to the bottom of the inner cavity of the temporary storage chamber (12) through pipe 2. The air outlet of exhaust fan 2 (11) is connected to the air inlet of the condenser of the distillation column (6). Liquid xylene is stored in the inner cavity of the balance chamber (13). Heating rods (24) are uniformly fixedly connected to the bottom of the inner cavity of the balance chamber (13). A cooler (21) is fixedly connected to the top of the inner cavity of the balance chamber (13). The top of the inner cavity of the balance chamber (13) is connected to the bottom of the inner cavity of the temporary storage chamber (12) through a connecting pipe. An electric ball valve (20) is provided on one side of the top of the connecting pipe.
2. The stabilizing tower for xylene production according to claim 1, characterized in that: The distillation column (6) is provided with a feed pipe (4), a light component discharge pipe (2) and a heavy component discharge pipe (3). The outer surfaces of the feed pipe (4), the light component discharge pipe (2) and the heavy component discharge pipe (3) are all covered with heat insulation pads. The ends of the feed pipe (4), the light component discharge pipe (2) and the heavy component discharge pipe (3) that are away from the distillation column (6) are all located outside the constant temperature chamber (1).
3. A stabilizing tower for xylene production according to claim 1, characterized in that: The connecting pipe includes a fixed-length pipe (23) fixedly connected to one side of the bottom of the inner cavity of the balance chamber (13). The top of the fixed-length pipe (23) is located above the liquid xylene. An electric ball valve (20) is fixedly connected to one side of the top of the fixed-length pipe (23). A telescopic pipe (17) is fixedly connected to the bottom of the fixed-length pipe (23). The bottom of the telescopic pipe (17) is fixedly connected to the lifting plate (22), and the bottom of the telescopic pipe (17) and the bottom of the lifting plate (22) are at the same height.
4. A stabilizing tower for xylene production according to claim 1, characterized in that: Pressure sensor 2 is fixedly connected to the bottom of the upper limit plate (16), and pressure sensor 3 is fixedly connected to the top of the lower limit plate (15).
5. A stabilizing tower for xylene production according to claim 1, characterized in that: The temperature sensor (7) is fixedly connected to the air distribution plate located at the bottom of the constant temperature chamber (1).
6. A stabilizing tower for xylene production according to claim 1, characterized in that: The outer surface of the constant temperature chamber (1) is covered with a heat insulation pad, and a heat sink (5) is fixedly connected to the top of the constant temperature chamber (1). The cold end of the refrigerator (21) is located inside the cavity of the balance chamber (13), and the hot end of the refrigerator (21) is fixedly connected to the heat sink (5).