Product extraction and energy-saving transformation system of rectifying tower for heliotropin production
Through the transformation of the distillation tower for the production of Xinyi jasminaldehyde, the problem of product yield and purity not meeting standards was solved, the residual amount of the kettle was reduced, the operation stability was improved, and energy consumption was reduced, and energy saving effect was achieved.
Patent Information
- Application Number
- CN202422121100.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-08-30
AI Technical Summary
The existing distillation tower for production of new jasminaldehyde is unreasonable, resulting in poor product yield, poor purity, high kettle residue, poor operating stability and high energy consumption.
Renovation is carried out on the basis of the existing distillation tower, including setting up a hollow structure between the product production outlet and the kettle residue outlet and multiple distillation tower plates, reducing the height of the product production outlet, and setting up a liquid collector and non-condensing exhaust outlet between the tower top condenser and the distillation tower to optimize the liquid collector structure for product production and reflow.
It improves product yield and purity, reduces kettle residual volume, improves operating stability, reduces energy consumption, and has low conversion cost and does not affect the normal condensation effect of the overhead condenser.
Smart Images
Figure CN223220991U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of distillation equipment, in particular to a product extraction and energy-saving transformation system of a distillation tower for producing new hediocalin. Background Art
[0002] Helional, a chemical molecule, is also known as Helional. Its molecular formula is C 11 H 12 O3 is a colorless to pale yellow oily liquid with floral, green, aldehyde, and ozone-like aromas. It is insoluble in water but soluble in alcohol. It is commonly used in floral, forest, and sea breeze-like fragrances, such as hare's ear flower / lilac, commercial perfumes, and odorants. Its long-lasting aroma is also found in cosmetics and detergents. Its usage is high and its price is relatively high. Heliotropin has a negative pressure boiling point of 134-135°C (399 Pa) and a standard boiling point of 282°C. In its production, heliotropin is purified using a distillation column, often with internal reflux.
[0003] However, the inventors discovered that: Figure 1 As shown, the existing internal reflux distillation tower 1 has a diameter of DN400 and a tower body height of 6.5m (including the product withdrawal port 11 at the top of the tower). Above the tower body is a vertical overhead condenser 2 with a height of 3m. During operation, the vacuum degree of the internal reflux distillation tower 1 is generally set to 400Pa. During the heating process of the distillation tower kettle, before the kettle temperature rises to 160°C, the temperature at the product withdrawal port 11 does not change significantly (i.e., ≤35°C). In other words, the product gas phase components at this time cannot reach the product withdrawal port 11. When the kettle temperature continues to rise, the temperature of the tower top product withdrawal port 11 will rise rapidly, and then drop rapidly. In order to successfully withdraw the product, the tower kettle temperature is further raised to 175°C, and a small amount of product is withdrawn. When the tower kettle temperature is further raised to 185°C, the temperature of the product withdrawal port 11 will slowly drop until no more product is withdrawn, and the distillation ends. Moreover, during the entire distillation process, the temperature of the product outlet 11 can be raised and distillate can be discharged only when the top condenser 2 is closed. However, this will cause the top temperature of the tower to be too high, and some light components will enter the vacuum unit and damage the equipment. If a small amount of circulating water is introduced into the top condenser 2, causing a little internal reflux in the tower, the temperature of the product outlet 11 will drop rapidly and no distillate will flow out.
[0004] Visible, existing rectifying tower structure makes the temperature of product extraction outlet difficult to control, product purity fluctuation is also larger, usually the new heliotrope product purity extracted is 98.36%, do not reach 99% qualification standard, also can cause a large amount of new heliotrope products to stay in the tower still, and because of the raising of rectification temperature, easily cause a large amount of materials of tower still to polymerize, calculate through weighing, still residual amount can reach more than 33.5% (ratio of still residual and product), increased rectification energy consumption and workload simultaneously.Therefore, how on the basis of existing purification unit, carry out the transformation of product extraction and energy-saving and consumption-reducing direction, become problem demanding prompt solution. Utility Model Content
[0005] The utility model provides a product extraction and energy-saving transformation system for a distillation tower used in the production of Xinyang jasminaldehyde, which is used to solve the problem of poor product yield and substandard purity caused by the unreasonable structure of the existing distillation tower.
[0006] The problems include high kettle residue, poor operating stability and high distillation energy consumption.
[0007] The utility model provides a product extraction and energy-saving transformation system of a distillation tower for producing new jasminaldehyde, comprising: a distillation tower and a tower top condenser, wherein the tower top of the distillation tower is directly connected to a heat exchange pipe in the tower top condenser; a non-condensable gas exhaust port is provided on the top shell of the tower top condenser, and the non-condensable gas exhaust port is connected to a vacuum pump; a product extraction port is provided on one side wall of the distillation tower, the product extraction port is connected to a product tank, and the product extraction port is provided at a height of 3-3.5m of the distillation tower body; a liquid collector is provided at 0-0.5m below the product extraction port; a kettle residue outlet is provided in the tower kettle of the distillation tower; the interior of the distillation tower between the product extraction port and the tower top condenser is a hollow structure, and the interior of the distillation tower between the product extraction port and the kettle residue outlet is provided with a plurality of distillation tower plates.
[0008] Furthermore, a feed inlet is provided on one side wall of the distillation tower, and the feed inlet is located at a height of 1.5-2 m of the distillation tower.
[0009] Furthermore, the kettle of the distillation tower is further provided with a reboiler, the material inlet of the reboiler is connected to the reboiler outlet of the distillation tower kettle, and the material outlet of the reboiler is connected to the reboiler inlet of the distillation tower kettle.
[0010] Furthermore, the reboiler outlet and the kettle residue outlet are symmetrically arranged on the side wall of the distillation tower kettle.
[0011] Furthermore, the liquid collector includes a mounting plate, which is fixed to the inner wall of the distillation tower body; a downcomer is provided on one side of the mounting plate, a downcomer pipe is connected below the downcomer, and the downcomer is provided on the side away from the product collection port; the mounting plate is also evenly provided with a plurality of upper air holes, and a side baffle is provided on the upper side of the upper air hole; a liquid guide plate is provided above the side baffle, and the liquid guide plate and the side baffle are connected by a vertically arranged connecting strip; the liquid guide plate and the upper air hole are arranged correspondingly above and below, and the size of the liquid guide plate can completely cover the upper air hole.
[0012] Furthermore, the upper air hole is a circular hole, and the side baffles are arranged around it to form a cylindrical structure.
[0013] Furthermore, the upper air hole is a rectangular slot hole, and the side baffles are arranged around it to form a rectangular slot structure.
[0014] Furthermore, the cross section of the liquid guide plate is V-shaped with high sides and low middle.
[0015] Furthermore, the central axis of the liquid guide plate is perpendicular to the axial direction of the product collection port.
[0016] The utility model provides a product extraction and energy-saving transformation system for a distillation tower for the production of new jasminaldehyde. The transformation system is a transformation carried out on the basis of an existing distillation tower, with low transformation cost and small transformation workload. After the transformation, the structure of the distillation tower is more reasonable, the temperature of the product extraction outlet becomes controllable, the product yield and purity are significantly improved, the kettle residue is significantly reduced, and the operational stability of the distillation tower is improved. Moreover, the temperature of the product extraction outlet is not affected by the tower top condenser, and the tower top condenser can normally perform the condensation function, the vacuum pressure drops quickly and the air resistance is small, the tower kettle temperature is reduced by more than 10°C compared with before the transformation, the energy consumption and load of the reboiler are reduced, the energy consumption and production operation cost of the distillation tower are reduced, and the energy-saving and consumption-reducing effect is significant.
[0017] The product extraction and reflux of the distillation tower are completed inside the distillation tower. The modified distillation section has a compact structure, which solves the problem that the tower body is too high, making it difficult for the product to reach the height of the product extraction port, and thus causing the top condenser to be unable to be put into normal use.
[0018] The liquid collector of the distillation tower has the function of collecting and redistributing. It can gather the liquid falling back from the top condenser and collect it on the installation plate, which is convenient for extraction and reflux. At the same time, it does not affect the rise of the gas phase, ensuring that the liquid collector has a gas phase flow channel of appropriate size, thereby not affecting the distillation effect of the distillation tower plate below. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0020] Figure 1 It is a structural schematic diagram of an existing distillation tower;
[0021] Figure 2 A schematic structural diagram of a distillation tower for producing jasminaldehyde provided by one embodiment of the present invention;
[0022] Figure 3 A diagram showing the connection between a liquid collector and a distillation column provided in one embodiment of the present invention;
[0023] Figure 4 This is a schematic structural diagram of a liquid collector provided in one embodiment of the present utility model.
[0024] Description of reference numerals:
[0025] 1. Distillation tower, 2. Top condenser, 3. Vacuum pump, 4. Product tank, 5. Reboiler, 11. Product outlet, 12. Liquid collector, 13. Kettle residue outlet, 14. Distillation tray, 15. Feed inlet, 21. Non-condensable gas outlet, 51. Reboiler outlet, 52. Reboiler inlet, 121. Mounting plate, 122. Downcomer, 123. Downcomer, 124. Upper air hole, 125. Side baffle, 126. Liquid guide plate, 127. Connecting strip. DETAILED DESCRIPTION
[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of the present invention.
[0027] like Figure 2The utility model provides a product extraction and energy-saving transformation system of a distillation tower 1 for the production of new jasminaldehyde, comprising: a distillation tower 1 and a top condenser 2, the top of the distillation tower 1 being directly connected to the heat exchange pipe in the top condenser 2; a non-condensable gas exhaust port 21 is provided on the top shell of the top condenser 2, and the non-condensable gas exhaust port 21 is connected to a vacuum pump 3; a product extraction port 11 is opened on one side wall of the distillation tower 1, the product extraction port 11 is connected to a product tank 4, and the product extraction port 11 is opened at a height of 3-3.5m of the tower body of the distillation tower 1; a liquid collector 12 is provided at 0-0.5m below the product extraction port 11; a kettle residue outlet 13 is provided in the kettle of the distillation tower 1; the interior of the distillation tower 1 between the product extraction port 11 and the top condenser 2 is a hollow structure, and a plurality of distillation trays 14 are provided in the distillation tower 1 between the product extraction port 11 and the kettle residue outlet 13.
[0028] When the distillation tower 1 of the modified system is in operation, the material enters the distillation tower 1 and gas-liquid two-phase mass transfer and heat transfer are carried out on the distillation tower plate 14. When the kettle temperature rises to 150°C, the temperature of the product outlet 11 can reach 135°C. At this time, a fraction has already flowed out, which is the pre-distillation. The pre-distillation can be applied to the alcoholysis reaction process for reuse. When the kettle temperature rises to 160°C, the temperature of the product outlet 11 can reach 143°C. When it is detected that the product purity reaches 99%, the distillate withdrawn from the product outlet 11 is changed into the product tank 4. When the kettle temperature continues to rise to 165°C, the temperature of the product outlet 11 can reach 159°C. If the detected product purity can still be maintained at more than 99%, the product will continue to be withdrawn until the kettle temperature remains unchanged, the temperature of the product outlet 11 drops and no distillate is withdrawn, and the distillation is completed. After the distillation column 1 of the modified system was completed, the residual volume (ratio of residual volume to product) was measured and calculated to be less than 2.5%, significantly improving the yield and purity of the product. The overhead condenser 2 is a vertical condenser commonly used in the art, and a cooling medium (such as circulating water) is introduced into the shell side of the overhead condenser 2 to ensure its condensation effect.
[0029] This modification system is a modification made on the basis of the existing distillation tower 1. It does not destroy the process of the existing distillation tower 1. The height of the product outlet 11 and the liquid collector 12 are lowered, leaving at least 3m of air height above the product outlet 11. The position of the top condenser 2 is not adjusted. Since it is modified on the basis of the existing distillation tower 1, the modification cost is low and the modification workload is small. The lowering of the position of the product outlet 11 makes the temperature of the product outlet 11 controllable during the distillation of the material in the distillation tower 1, thereby improving the yield and purity of the product and the operational stability of the distillation tower 1. The temperature of the product outlet 11 is not affected by the top condenser 2, and the top condenser 2 can perform its condensation function normally. The vacuum pressure drop is fast and the air resistance is small. Finally, the non-condensable waste gas is discharged through the non-condensable gas outlet 21, which can prevent the light components from entering the vacuum pump 3 and causing damage to it. In addition, the bottom temperature of the tower is reduced by more than 10°C compared with before the transformation, which reduces the energy consumption and load of the reboiler 5, and can also reduce the energy consumption and production operation costs of the distillation tower 1. It also solves the problem that the tower body is too high, making it difficult for the product to reach the height of the product outlet 11, and thus causing the top condenser 2 to be unable to be put into normal use.
[0030] Furthermore, a feed inlet 15 is provided on one side wall of the distillation tower 1, and is located at a height of 1.5-2 meters of the distillation tower 1. The position of the feed inlet 15 has not been modified, but after the modification, the internal structure of the distillation tower 1 is more reasonable, the top condenser 2 can be used normally, the distillation section structure is more compact, the distillation environment is changed, and the distillation efficiency of the distillation tower 1 is improved.
[0031] Furthermore, the bottom of the distillation tower 1 is further provided with a reboiler 5 , the material inlet of the reboiler 5 is connected to the reboiler outlet 51 of the bottom of the distillation tower 1 , and the material outlet of the reboiler 5 is connected to the reboiler inlet 52 of the bottom of the distillation tower 1 .
[0032] Furthermore, the reboiler outlet 51 and the kettle residue outlet 13 are symmetrically arranged on the side wall of the kettle of the distillation tower 1.
[0033] like Figure 3 and Figure 4 Furthermore, the liquid collector 12 includes a mounting plate 121, which is fixed to the inner wall of the distillation tower 1; a downcomer 122 is provided on one side of the mounting plate 121, and a downcomer 123 is connected below the downcomer 122, and the downcomer 122 is provided on a side away from the product extraction port 11; the mounting plate 121 is also evenly provided with a plurality of upper air holes 124, and the upper side of the upper air holes 124 is surrounded by a side baffle 125; a liquid guide plate 126 is provided above the side baffle 125, and the liquid guide plate 126 and the side baffle 125 are connected by a vertically arranged connecting strip 127; the liquid guide plate 126 is arranged corresponding to the upper air hole 124, and the size of the liquid guide plate 126 can completely cover the upper air hole 124.
[0034] After the overhead condenser 2 completes its normal condensation operation, the condensed liquid is collected and redistributed through the liquid collector 12. A portion is discharged through the product extraction port 11, while a portion flows as reflux through downcomers 122 and downcomers 123, toward the distillation tray 14 below. The vapor phase below then rises through the channel formed by upper air holes 124 and side baffles 125 into the empty section above the liquid collector 12 and the overhead condenser 2. Liquid falling back from the overhead condenser 2 is concentrated by liquid guide plates 126 and collected on mounting plate 121, facilitating extraction and reflux. Liquid guide plates 126 also prevent the falling liquid from falling through upper air holes 124 and affecting the ascent of the vapor phase. The connecting strip 127 facilitates the installation and fixation of the liquid guide plate 126. At the same time, the distance between the liquid guide plate 126 and the side baffle 125 can be adjusted through the connecting strip 127, thereby ensuring that the liquid collector 12 has a gas phase flow channel of appropriate size, thereby not affecting the distillation effect of the distillation tower plate 14 below.
[0035] Furthermore, the upper air hole 124 is a circular hole, and the side baffle 125 is arranged around it to form a cylindrical structure.
[0036] like Figure 4 Furthermore, the upper air hole 124 is a rectangular slot hole, and the side baffle 125 is surrounded to form a rectangular slot structure.
[0037] Furthermore, the cross section of the liquid guide plate 126 is V-shaped with high sides and low middle.
[0038] Furthermore, the central axis of the liquid guide plate 126 is perpendicular to the axis of the product outlet 11. The liquid guide plate 126 is configured with a V-shaped cross-section to facilitate the rapid discharge of the concentrated falling liquid from both sides and collection on the mounting plate 121. The central axis of the liquid guide plate 126 is perpendicular to the axis of the product outlet 11 so that the falling liquid forms a liquid layer of stable thickness on the mounting plate 121. This not only ensures a stable flow rate of product from the product outlet 11, but also ensures a stable flow rate of reflux liquid discharged from the downcomer 123, thereby ensuring the distillation effect of the distillation tray 14 below.
[0039] The product extraction and energy-saving transformation system of the distillation tower 1 for the production of new jasminaldehyde of the utility model is as follows: during operation, the vacuum pump 3 connected to the distillation tower 1 is turned on, and the material enters the distillation tower 1 through the feed port 15. At the same time, the material in the tower kettle is heated and vaporized through the reboiler 5, and the gas-liquid two-phase performs mass and heat transfer on the distillation tower plate 14. At the same time, the cooling medium inlet and outlet of the top condenser 2 of the distillation tower 1 is opened, and the cooling medium is introduced into the top condenser 2, so that the top condenser 2 can perform condensation work normally. When the kettle temperature rises to 150°C, the temperature of the product outlet 11 can reach 135°C. At this time, a fraction has already flowed out, which is the pre-distillation. The pre-distillation can be applied to the alcoholysis reaction process for reuse. When the kettle temperature rises to 160°C, the temperature of the product outlet 11 can reach 143°C. When the product purity is detected to reach 99%, the fraction withdrawn from the product outlet 11 is transferred to the product tank 4. When the kettle temperature continues to rise to 165°C, the temperature of the product outlet 11 can reach 159°C. If the product purity is still maintained above 99%, the product is continued to be withdrawn until the kettle temperature remains unchanged, the temperature of the product outlet 11 drops, and no fraction is withdrawn. The distillation is completed, and the kettle residue is discharged from the distillation tower 1 through the kettle residue outlet 13. After the operation of the distillation tower 1 of the modified system is completed, the kettle residue (the ratio of kettle residue to product) is weighed and calculated to be less than 2.5%, and the yield and purity of the product are significantly improved.
[0040] During operation of overhead condenser 2, the rising vapor phase is condensed by overhead condenser 2, and the non-condensable waste gas is discharged through non-condensable gas outlet 21. The condensed liquid falls onto liquid guide plate 126 of liquid collector 12. Due to the converging effect of the V-shaped liquid guide plate 126, the falling liquid is quickly discharged from both sides and collected on mounting plate 121, forming a liquid layer of stable thickness. Part of it is discharged to product tank 4 through product production outlet 11, and part of it flows as reflux through downcomers 122 and downcomers 123 to the distillation tray 14 below. The vapor phase provided by reboiler 5 below rises through the channel surrounded by upper air holes 124 and side baffles 125 into the empty high section above liquid collector 12 and overhead condenser 2.
[0041] It should be noted that the detailed structure of some devices is not described in detail in this utility model, but belongs to the prior art known to those skilled in the art, so it will not be repeated here. In addition, the parts not described in this device are the same as the prior art or can be implemented by using the prior art.
[0042] It should be noted that pressure sensors, flow meters or temperature sensors are installed on the transmission pipelines inside the system between different units, devices and equipment. Different valves, such as pressure relief valves, pressure regulating valves, safety valves, etc., are also installed to adjust and stabilize the pressure of the entire system.
[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A product extraction and energy-saving transformation system for a distillation tower for the production of new jasminaldehyde, characterized in that: include: A distillation tower and a top condenser, the top of the distillation tower is directly connected to the heat exchange pipe in the top condenser; a non-condensable gas outlet is provided on the top shell of the top condenser, and the non-condensable gas outlet is connected to a vacuum pump; a product outlet is provided on one side wall of the distillation tower, and the product outlet is connected to a product tank, and the product outlet is provided at a height of 3-3.5m of the distillation tower body; a liquid collector is provided at 0-0.5m below the product outlet; the kettle of the distillation tower is provided with a kettle residue outlet; the interior of the distillation tower between the product outlet and the top condenser is a hollow structure, and the interior of the distillation tower between the product outlet and the kettle residue outlet is provided with multiple distillation tower plates.
2. The product extraction and energy-saving transformation system of the distillation tower for the production of new jasminal according to claim 1, characterized in that: A feed inlet is provided on one side wall of the distillation tower, and the feed inlet is arranged at a height of 1.5-2m of the distillation tower.
3. The product extraction and energy-saving transformation system of the distillation tower for the production of new jasminal according to claim 1, characterized in that, The tower kettle of the distillation tower is further provided with a reboiler, the material inlet of the reboiler is connected to the reboiler outlet of the tower kettle of the distillation tower, and the material outlet of the reboiler is connected to the reboiler inlet of the tower kettle of the distillation tower.
4. The product extraction and energy-saving transformation system of the distillation tower for the production of new jasminal according to claim 3, characterized in that: The reboiler outlet and the kettle residue outlet are symmetrically arranged on the side wall of the distillation tower kettle.
5. The product extraction and energy-saving transformation system of the distillation tower for the production of hediocalin according to any one of claims 1 to 4, characterized in that: The liquid collector includes a mounting plate fixed to the inner wall of the distillation tower body; a downcomer is provided on one side of the mounting plate, a downcomer is connected below the downcomer, and the downcomer is provided on a side away from the product extraction port; The mounting plate is also evenly provided with a plurality of upper air holes, and a side baffle is provided on the upper side of the upper air holes; a liquid guide plate is provided above the side baffle, and the liquid guide plate and the side baffle are connected by a vertically arranged connecting strip; the liquid guide plate and the upper air holes are arranged correspondingly above and below, and the size of the liquid guide plate can completely cover the upper air holes.
6. The product extraction and energy-saving transformation system of the distillation tower for the production of new jasminal according to claim 5, characterized in that: The upper air hole is a circular hole, and the side baffles are arranged around it to form a cylindrical structure.
7. The product extraction and energy-saving transformation system of the distillation tower for the production of new jasminal according to claim 5, characterized in that: The upper air hole is a rectangular slot hole, and the side baffles are arranged to form a rectangular slot structure.
8. The product extraction and energy-saving transformation system of the distillation tower for the production of new jasminal according to claim 5, characterized in that: The cross section of the liquid guide plate is V-shaped with high sides and low middle.
9. The product extraction and energy-saving transformation system of the distillation tower for the production of new jasminal according to claim 8, characterized in that: The central axis of the liquid guide plate is perpendicular to the axis direction of the product collection port.