Distillation structure for supercritical fluid extraction

Abstract

The utility model relates to the technical field of supercritical fluid extraction, and discloses a distillation structure for supercritical fluid extraction, which comprises a first distillation kettle, a first feeding pipe is fixedly connected to the upper end of the first distillation kettle, a first distillation pipe is fixedly connected to the upper end of the first distillation kettle, and a first electromagnetic valve is fixedly connected to the outer side of the first distillation pipe. According to the distillation structure for supercritical fluid extraction, the first distillation still and the second distillation still are arranged, one of the first distillation still and the second distillation still can be selected according to requirements for single extraction of supercritical fluid, the first distillation still and the second distillation still can be alternately used and are convenient to maintain, and the first distillation still and the second distillation still can be used in cooperation; the supercritical fluid is extracted twice, the extraction effect is improved, different extraction requirements are met, the operation flexibility is improved, the guide plate is of a spiral structure, steam can be guided to spirally flow in the heat exchange pipe, the contact time and the contact area of the steam and the cooling pipe are increased, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of supercritical fluid extraction, in particular to a distillation structure for supercritical fluid extraction. Background Art

[0002] Supercritical fluid extraction is a process of extracting and separating target substances by utilizing the excellent solubility and mass transfer properties of fluids in a supercritical state. After supercritical fluid extraction, the extract usually needs to be further distilled to improve the purity and quality of the product.

[0003] Chinese utility model patent announcement number: CN 214551261 U, discloses: a distillation device for improving supercritical fluid extraction of clean oil. The distillation device for improving supercritical fluid extraction of clean oil solves the problem that the extraction purity of existing distillation devices for supercritical fluid extraction is poor and cannot meet the requirements well, and it is necessary to improve the extraction of clean oil supercritical fluid. The vacuum exhaust pump of the exhaust device of the utility model drives the exhaust pipe to exhaust outward, and the air in the device enters the exhaust pipe through the exhaust connection on the cylinder cover body and is then discharged from the exhaust port. However, the distillation device for improving supercritical fluid extraction of clean oil relies solely on the exhaust device to improve the purity, and the effect is not significant enough, resulting in poor extraction effect. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a distillation structure for supercritical fluid extraction, which can effectively solve the problems in the prior art.

[0005] The technical solution adopted by the utility model is: a distillation structure for supercritical fluid extraction, comprising a distillation kettle, wherein the upper end of the distillation kettle is fixedly connected to a feed pipe, the upper end of the distillation kettle is fixedly connected to a distillation pipe, the outer side of the distillation pipe is fixedly connected to a solenoid valve, the left side of the distillation pipe is fixedly connected to a heat exchange pipe, the inner wall of the heat exchange pipe is fixedly connected to a guide plate, the outer side of the heat exchange pipe is fixedly connected to a cooling pipe, a distillation kettle is provided on the left side of the distillation pipe, the upper end of the distillation kettle is fixedly connected to a feed pipe, a discharge pipe and the distillation pipe, the upper end of the distillation pipe is fixedly connected to the distillation pipe, the outer side of the distillation pipe is fixedly connected to a one-way valve and a two-solenoid valve, the upper end of the discharge pipe is fixedly connected to a liquid inlet pipe, the outer side of the liquid inlet pipe is fixedly connected to a two-way valve and a three-solenoid valve, the lower end of the heat exchange pipe is fixedly connected to a liquid outlet pipe, the outer side of the liquid outlet pipe is fixedly connected to a four-solenoid valve, the lower end of the liquid outlet pipe is fixedly connected to a collecting tank, the rear end of the collecting tank is fixedly connected to a discharge pipe, and the outer side of the discharge pipe is fixedly connected to a discharge valve;

[0006] The distillation kettle includes an outer shell, an inner shell, a heating tube, an observation window, a motor, a stirring blade, a discharge pipe, a discharge valve and a thermometer and pressure gauge. The inner shell is fixedly connected to the inside of the outer shell, a heating tube is provided inside the outer shell, an observation window is provided at the upper end of the outer shell, a motor is fixedly connected to the upper end of the outer shell, a stirring blade is fixedly connected to the output end of the motor, a discharge pipe is fixedly connected to the lower end of the outer shell, a discharge valve is fixedly connected to the outside of the discharge pipe, and a thermometer is fixedly connected to the outside of the outer shell.

[0007] Preferably, the distillation kettle 1 and the distillation kettle 2 have the same structure, and the heating pipe is arranged between the outer shell and the inner shell.

[0008] Through the above technical solution, distillation kettle one and distillation kettle two are set up. One of distillation kettle one and distillation kettle two can be selected according to needs to perform a single extraction of supercritical fluid. Distillation kettle one and distillation kettle two can be used alternately for easy maintenance. Distillation kettle one and distillation kettle two can also be used together to perform two extractions of supercritical fluid to improve the extraction effect.

[0009] Preferably, the shell is a cylindrical structure, and the collection tank is a cylindrical structure.

[0010] Through the above technical solution, the shell has a cylindrical structure with high structural strength. When only the distillation kettle is used for distillation extraction, the raw materials and solvent are added to the distillation kettle through the feed pipe, the heating pipe is started, the distillation kettle is heated, and the temperature and pressure in the distillation kettle are observed by the thermometer and pressure gauge. The motor is started to drive the stirring blade to rotate, so that the raw materials and solvent are fully mixed, thereby improving the extraction efficiency. When the temperature and pressure in the distillation kettle reach appropriate conditions, the supercritical fluid in the raw materials begins to vaporize and enters the heat exchange tube through the distillation tube. In the heat exchange tube, the vaporized supercritical fluid exchanges heat with the coolant injected from the cooling tube, and the steam is condensed into liquid. The solenoid valve four is opened, and the condensed liquid flows into the collection tank through the liquid outlet pipe. When the distillation is completed, the discharge valve is opened to discharge the residue in the distillation kettle through the discharge pipe.

[0011] Preferably, the liquid inlet pipe is fixedly connected to one end of the heat exchange pipe, and the second distillation pipe is fixedly connected to the other end of the heat exchange pipe.

[0012] Through the above technical solution, a heat exchange tube is set up. When two extractions are required, first open solenoid valve one and solenoid valve three, close solenoid valve two and solenoid valve four, and distillation kettle one distills the raw materials and solvent. The condensed liquid enters distillation kettle two through the liquid inlet pipe. Close solenoid valve one and solenoid valve three and open solenoid valve two and solenoid valve four, heat and stir distillation kettle two, and perform other operations such as second extraction. The extracted liquid enters the collection tank.

[0013] Preferably, the guide plate has a spiral structure, and the heat exchange tube has a downwardly inclined structure.

[0014] The aforementioned technical solution utilizes a spiral guide plate, which guides the steam through the heat exchange tubes in a spiral pattern, increasing the contact time and area between the steam and the cooling tubes, thereby improving heat exchange efficiency. The downwardly sloping heat exchange tubes facilitate the smooth outflow of condensed liquid, preventing accumulation of liquid within the tubes.

[0015] Preferably, the flow direction of the one-way valve 1 is from bottom to top, and the flow direction of the one-way valve 2 is from top to bottom.

[0016] Through the above technical solution, one-way valve 1 and one-way valve 2 are set to ensure that steam and liquid do not flow back.

[0017] Preferably, the observation window is made of ultra-white transparent glass.

[0018] Through the above technical solution, the observation window is made of ultra-white transparent glass, which can clearly observe the distillation situation inside the distillation kettle, making it convenient for the operator to grasp the distillation process in a timely manner.

[0019] Compared with the prior art, the present invention provides a distillation structure for supercritical fluid extraction, which has the following beneficial effects:

[0020] 1. The distillation structure for supercritical fluid extraction is provided with a distillation kettle 1 and a distillation kettle 2. One of the distillation kettles 1 and 2 can be selected according to demand for single extraction of supercritical fluid. The distillation kettle 1 and the distillation kettle 2 can be used alternately for easy maintenance. The distillation kettle 1 and the distillation kettle 2 can also be used together to perform two extractions of supercritical fluid, thereby improving the extraction effect, meeting different extraction requirements, and increasing the flexibility of operation.

[0021] 2. The distillation structure for supercritical fluid extraction has a spiral guide plate that can guide the steam to flow in a spiral shape in the heat exchange tube, increasing the contact time and contact area between the steam and the cooling tube, and improving the heat exchange efficiency. The heat exchange tube is inclined downward, which is conducive to the smooth outflow of the condensed liquid and avoids the accumulation of liquid in the tube. A thermometer and pressure gauge are provided, and the observation window can monitor the situation in the distillation kettle in real time, making it convenient for the operator to grasp the distillation progress in time, adjust the operating parameters, and ensure the stability of the distillation process. A stirring blade is provided to fully mix the raw materials and solvent to improve the extraction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model Figure 3 ;

[0025] Figure 4 This is a schematic diagram of the split structure of the distillation kettle of the utility model;

[0026] Figure 5 This is a schematic diagram of the disassembled structure of the heat exchange tube and guide plate of the utility model.

[0027] Among them: 1. Distillation kettle 1; 101. Outer shell; 102. Inner shell; 103. Heating tube; 104. Observation window; 105. Motor; 106. Stirring blade; 107. Discharge pipe; 108. Discharge valve; 109. Thermostat; 2. Feed pipe 1; 3. Distillation tube 1; 4. Solenoid valve 1; 5. Heat exchange tube; 6. Guide plate; 7. Cooling tube; 8. Distillation kettle 2; 9. Feed pipe 2; 10. Outlet pipe; 11. Distillation tube 2; 12. One-way valve 1; 13. Solenoid valve 2; 14. Liquid inlet pipe; 15. One-way valve 2; 16. Solenoid valve 3; 17. Liquid outlet pipe; 18. Solenoid valve 4; 19. Collection tank; 20. Discharge pipe; 21. Discharge valve. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1: Figure 1-5As shown, the utility model provides a distillation structure for supercritical fluid extraction, including a distillation kettle 1, a feed pipe 2 fixedly connected to the upper end of the distillation kettle 1, a distillation tube 3 fixedly connected to the upper end of the distillation kettle 1, a solenoid valve 4 fixedly connected to the outer side of the distillation tube 3, a heat exchange tube 5 fixedly connected to the left side of the distillation tube 3, a guide plate 6 fixedly connected to the inner wall of the heat exchange tube 5, a cooling tube 7 fixedly connected to the outer side of the heat exchange tube 5, a distillation kettle 2 8 is provided on the left side of the distillation tube 3, and a feed pipe 2 9, a guide pipe 10 and a distillation tube 2 1 are fixedly connected to the upper end of the distillation kettle 2 8. 1. The upper end of the second distillation tube 11 is fixedly connected to the second distillation tube 11, and the outer side of the second distillation tube 11 is fixedly connected to the first one-way valve 12 and the second solenoid valve 13. The upper end of the outlet pipe 10 is fixedly connected to the liquid inlet pipe 14, and the outer side of the liquid inlet pipe 14 is fixedly connected to the second one-way valve 15 and the third solenoid valve 16. The lower end of the heat exchange tube 5 is fixedly connected to the liquid outlet pipe 17, and the outer side of the liquid outlet pipe 17 is fixedly connected to the fourth solenoid valve 18. The lower end of the liquid outlet pipe 17 is fixedly connected to the collection tank 19, and the rear end of the collection tank 19 is fixedly connected to the discharge pipe 20, and the outer side of the discharge pipe 20 is fixedly connected to the discharge valve 21;

[0030] The distillation kettle 1 includes an outer shell 101, an inner shell 102, a heating tube 103, an observation window 104, a motor 105, a stirring blade 106, a discharge pipe 107, a discharge valve 108 and a thermometer and pressure gauge 109. The inner shell 102 is fixedly connected to the inner shell 101, a heating tube 103 is provided inside the outer shell 101, an observation window 104 is provided at the upper end of the outer shell 101, a motor 105 is fixedly connected to the upper end of the outer shell 101, a stirring blade 106 is fixedly connected to the output end of the motor 105, a discharge pipe 107 is fixedly connected to the lower end of the outer shell 101, a discharge valve 108 is fixedly connected to the outside of the discharge pipe 107, and a thermometer and pressure gauge 109 is fixedly connected to the outside of the outer shell 101.

[0031] Specifically, distillation kettle 1 and distillation kettle 2 8 have the same structure, with heating tube 103 disposed between outer shell 101 and inner shell 102. Advantageously, the provision of distillation kettle 1 and distillation kettle 2 8 allows for the selection of either distillation kettle 1 or distillation kettle 2 8 for single supercritical fluid extraction, allowing for alternating use of distillation kettle 1 and distillation kettle 2 8 for easier maintenance. Alternatively, distillation kettle 1 and distillation kettle 2 8 can be used together for dual supercritical fluid extraction, enhancing extraction efficiency.

[0032] Specifically, the housing 101 is cylindrical, and the collection tank 19 is also cylindrical. Advantageously, the cylindrical structure of the housing 101 provides high structural strength. When using only the still pot 1 for distillation extraction, the raw materials and solvent are added to the still pot 1 through the feed pipe 2. The heating pipe 103 is activated to heat the still pot 1. The temperature and pressure within the still pot are simultaneously monitored using a thermometer and pressure gauge 109. The motor 105 is activated to rotate the stirring blade 106, ensuring thorough mixing of the raw materials and solvent and improving extraction efficiency. When the temperature and pressure within the still pot 1 reach suitable conditions, the supercritical fluid in the raw materials begins to vaporize and enters the heat exchange tube 5 through the still pot 3. Within the heat exchange tube 5, the vaporized supercritical fluid exchanges heat with the coolant injected from the cooling pipe 7, condensing the vapor into liquid. The solenoid valve 24 18 is then opened, allowing the condensed liquid to flow through the liquid outlet pipe 17 into the collection tank 19. When distillation is complete, the discharge valve 108 is opened, discharging the residue from the still pot through the discharge pipe 107.

[0033] Example 2: Figure 2-5 As shown, as an improvement to the previous embodiment.

[0034] Specifically, liquid inlet pipe 14 is fixedly connected to one end of heat exchange pipe 5, and distillation pipe 2 11 is fixedly connected to the other end of heat exchange pipe 5. Advantageously, with heat exchange pipe 5, when a second extraction is required, solenoid valve 1 4 and solenoid valve 3 16 are first opened, solenoid valve 2 13 and solenoid valve 4 18 are closed, and distillation kettle 1 distills the raw materials and solvent. The condensed liquid enters distillation kettle 2 8 through liquid inlet pipe 14. Solenoid valve 1 4 and solenoid valve 3 16 are then closed, and solenoid valve 2 13 and solenoid valve 4 18 are opened. Distillation kettle 2 8 is heated and stirred, and a second extraction is performed. The extracted liquid enters collection tank 19.

[0035] Specifically, the guide plate 6 has a spiral structure, and the heat exchange tube 5 is tilted downward. Advantageously, the spiral structure of the guide plate 6 guides the steam to flow in a spiral pattern within the heat exchange tube 5, increasing the contact time and area between the steam and the cooling tube 7 and improving heat exchange efficiency. The downward tilt of the heat exchange tube 5 facilitates the smooth outflow of condensed liquid and prevents liquid accumulation within the tube.

[0036] Specifically, the flow direction of the one-way valve 12 is from bottom to top, and the flow direction of the one-way valve 2 15 is from top to bottom. The advantage is that the one-way valve 12 and the one-way valve 2 15 are set to ensure that steam and liquid will not flow back.

[0037] Specifically, the observation window 104 is made of ultra-clear glass. Advantageously, the observation window 104 is made of ultra-clear glass, which allows for clear observation of the distillation process inside the still 1, allowing operators to monitor the distillation process in a timely manner.

[0038] Working principle: When using, only use the distillation kettle 1 for distillation extraction, add the raw materials and solvent into the distillation kettle 1 through the feed pipe 2, start the heating pipe 103 to heat the distillation kettle 1, and at the same time observe the temperature and pressure in the distillation kettle through the thermometer and pressure gauge 109, start the motor 105, drive the stirring blade 106 to rotate, so that the raw materials and solvent are fully mixed, and the extraction efficiency is improved. When the temperature and pressure in the distillation kettle 1 reach the appropriate conditions, the supercritical fluid in the raw materials begins to vaporize and enters the heat exchange tube 5 through the distillation tube 3. In the heat exchange tube 5, the vaporized supercritical fluid exchanges heat with the coolant injected from the cooling tube 7, and the steam is condensed into liquid. Open the electromagnetic valve 4 18, and the condensed liquid flows out through the liquid outlet pipe 17. The raw materials and the solvent are distilled into the distillation kettle 1 at first, and the condensed liquid enters the distillation kettle 2 8 through the liquid inlet pipe 14. The solenoid valve 14 and the solenoid valve 3 16 are closed, and the solenoid valve 2 13 and the solenoid valve 4 18 are opened. The distillation kettle 1 distills the raw materials and the solvent. The condensed liquid enters the distillation kettle 2 8 through the liquid inlet pipe 14. The solenoid valve 14 and the solenoid valve 3 16 are closed, and the solenoid valve 2 13 and the solenoid valve 4 18 are opened. The distillation kettle 2 8 is heated, stirred and other operations are performed for the second extraction. The extracted liquid enters the collection tank 19, which meets different extraction requirements and improves the flexibility of operation.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distillation structure for supercritical fluid extraction, comprising a distillation kettle (1), characterized in that: The upper end of the distillation kettle (1) is fixedly connected to a feed pipe (2), the upper end of the distillation kettle (1) is fixedly connected to a distillation pipe (3), the outer side of the distillation pipe (3) is fixedly connected to a solenoid valve (4), the left side of the distillation pipe (3) is fixedly connected to a heat exchange pipe (5), the inner wall of the heat exchange pipe (5) is fixedly connected to a guide plate (6), the outer side of the heat exchange pipe (5) is fixedly connected to a cooling pipe (7), a distillation kettle (8) is provided on the left side of the distillation pipe (3), the upper end of the distillation kettle (8) is fixedly connected to a feed pipe (9), an outlet pipe (10) and a distillation pipe (11), the upper end of the distillation pipe (11) is fixedly connected to a distillation pipe (5). A second distillation tube (11), the outer side of the second distillation tube (11) is fixedly connected to a one-way valve (12) and a second solenoid valve (13), the upper end of the outlet tube (10) is fixedly connected to a liquid inlet tube (14), the outer side of the liquid inlet tube (14) is fixedly connected to a one-way valve (15) and a third solenoid valve (16), the lower end of the heat exchange tube (5) is fixedly connected to a liquid outlet tube (17), the outer side of the liquid outlet tube (17) is fixedly connected to a fourth solenoid valve (18), the lower end of the liquid outlet tube (17) is fixedly connected to a collecting tank (19), the rear end of the collecting tank (19) is fixedly connected to a discharge tube (20), and the outer side of the discharge tube (20) is fixedly connected to a discharge valve (21); The distillation kettle (1) comprises an outer shell (101), an inner shell (102), a heating tube (103), an observation window (104), a motor (105), a stirring blade (106), a discharge pipe (107), a discharge valve (108) and a thermometer (109), wherein the inner shell (102) is fixedly connected to the interior of the outer shell (101), a heating tube (103) is provided inside the outer shell (101), an observation window (104) is provided at the upper end of the outer shell (101), the upper end of the outer shell (101) is fixedly connected to the motor (105), the output end of the motor (105) is fixedly connected to the stirring blade (106), the lower end of the outer shell (101) is fixedly connected to the discharge pipe (107), the outer side of the discharge pipe (107) is fixedly connected to the discharge valve (108), and the outer side of the outer shell (101) is fixedly connected to the thermometer (109).

2. A distillation structure for supercritical fluid extraction according to claim 1, characterized in that: The distillation kettle 1 (1) and the distillation kettle 2 (8) have the same structure, and the heating pipe (103) is arranged between the outer shell (101) and the inner shell (102).

3. The distillation structure for supercritical fluid extraction according to claim 1, characterized in that: The housing (101) is a cylindrical structure, and the collecting tank (19) is a cylindrical structure.

4. The distillation structure for supercritical fluid extraction according to claim 1, characterized in that: The liquid inlet pipe (14) is fixedly connected to one end of the heat exchange pipe (5), and the second distillation pipe (11) is fixedly connected to the other end of the heat exchange pipe (5).

5. The distillation structure for supercritical fluid extraction according to claim 1, characterized in that: The guide plate (6) has a spiral structure, and the heat exchange tube (5) has a downwardly inclined structure.

6. The distillation structure for supercritical fluid extraction according to claim 1, characterized in that: The flow direction of the one-way valve 1 (12) is from bottom to top, and the flow direction of the one-way valve 2 (15) is from top to bottom.

7. The distillation structure for supercritical fluid extraction according to claim 1, characterized in that: The observation window (104) is made of ultra-white transparent glass.

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