A concentration kettle

Abstract

The utility model provides a kind of concentration still, including still body, the upper end of still body is provided with liquid feeding pipe and negative pressure pipe, valve is all provided on liquid feeding pipe and negative pressure pipe, the lower end of still body is provided with drain pipe, the open end of drain pipe is detachably connected with sealing plug, still body is sleeved with heating jacket, the outward communication of heating jacket has the water outlet pipe and inlet pipe of upside-down distribution, still body is connected with the evaporation cylinder of vertically arranged and both ends are open, the lateral wall of evaporation cylinder is open at upper end and hollow structure, circulation pump is provided outside still body, the upper portion of drain pipe is outwardly communicated with the circulation inlet pipe connected with the inlet end of circulation pump and communication, the outlet end of circulation pump is connected with and is communicated with circulation outlet pipe, the free end of circulation outlet pipe is inserted into still body and is connected with and communicated with the inner cavity of the lateral wall of evaporation cylinder.The utility model can effectively increase the surface area of liquid when concentrating, further improve concentration speed.

Description

Technical Field

[0001] This utility model belongs to the field of concentration kettle technology and relates to a concentration kettle. Background Technology

[0002] In industries such as chemical, pharmaceutical, food, and fine chemicals, material concentration is a common unit operation. Its purpose is to remove solvents (usually water or other low-boiling-point organic solvents) to increase the concentration of the target component or to achieve pre-drying treatment of the product. Traditional concentration equipment is diverse, including evaporators, rotary evaporators, thin-film evaporators, and concentration kettles. Among these, the concentration kettle, as a relatively simple, flexible, and batch-type concentration device suitable for small-batch or multi-variety production, is widely used in laboratory and pilot-scale production scenarios.

[0003] Concentrators are typically made of corrosion-resistant materials (such as stainless steel or glass lining) and equipped with key components such as heating jackets, stirring systems, condensation reflux devices, and vacuum interfaces. Their working principle involves vaporizing volatile components in the liquid within the reactor under heating and / or reduced pressure conditions, which are then recovered or discharged through a condensation system, thereby achieving solvent removal and material concentration. However, in this process, liquid evaporation is essentially an interfacial phenomenon—that is, the phase change occurs only at the "gas-liquid interface," that is, on the free surface of the liquid. This means that even if the entire liquid inside the reactor is heated, the actual vaporization area is still limited to the surface layer; the internal liquid must rely on convection or stirring to transfer heat to the interface.

[0004] Therefore, to improve concentration efficiency and accelerate evaporation rate, two main methods are typically employed in industry: first, increasing the system temperature to enhance molecular kinetic energy and encourage more liquid molecules to overcome surface tension and escape; second, reducing the system pressure (e.g., using vacuum operation) to lower the solvent's boiling point, thereby achieving evaporation at a lower temperature. However, both strategies involve high energy consumption: heating requires continuous heating, while vacuuming relies on high-power vacuum pump systems. Furthermore, excessively high temperatures may cause the decomposition or deterioration of heat-sensitive substances, limiting the optimization space for process conditions. Utility Model Content

[0005] The purpose of this invention is to provide a concentration vessel that can effectively increase the surface area of ​​the liquid during concentration, thereby further improving the concentration speed.

[0006] To solve the above-mentioned technical problems, this utility model provides a concentration vessel, including a vessel body. A liquid addition pipe and a negative pressure pipe are provided at the upper end of the vessel body, both equipped with valves. A drain pipe is provided at the lower end of the vessel body, with a sealing plug detachably connected to the open end of the drain pipe. A heating jacket is fitted over the vessel body, and an outlet pipe and an inlet pipe, distributed vertically, are connected to the heating jacket. An evaporation cylinder, vertically arranged and open at both ends, is connected inside the vessel body. The side wall of the evaporation cylinder is open at the upper end and has a hollow structure. A circulation pump is installed outside the vessel body. A circulation inlet pipe, connected to the inlet end of the circulation pump, is connected to the upper part of the drain pipe. A circulation outlet pipe is connected to the outlet end of the circulation pump, and the free end of the circulation outlet pipe extends into the vessel body and connects to the inner cavity of the side wall of the evaporation cylinder.

[0007] By adopting the above technical solution, when it is necessary to concentrate the extract in the reactor, first open the valve on the liquid addition pipe to add the extract into the reactor, and then close the valve. Next, start the negative pressure pump to extract the air from the reactor through the negative pressure pipe, creating a negative pressure environment inside the reactor, lowering the boiling point of the solvent, and causing the extract in the reactor to begin evaporation.

[0008] At the same time, the circulation pump is started. The solution in the vessel enters the circulation pump through the circulation inlet pipe at the top of the drain pipe, and then flows into the inner cavity of the side wall of the evaporation cylinder through the circulation outlet pipe. After flowing out from the upper opening, it flows down along the inner and outer walls of the evaporation cylinder. During this process, the liquid is in full contact with the inner and outer walls of the evaporation cylinder, which greatly increases the surface area of ​​the liquid, allowing the extract to be rapidly evaporated and concentrated on the inner and outer walls of the evaporation cylinder.

[0009] Once concentration is complete, remove the sealing plug from the drain pipe, and the concentrated liquid can be discharged from the vessel through the drain pipe.

[0010] The present invention is further configured such that a high-pressure water pipe is connected to the upper end of the vessel body, a valve is provided on the high-pressure water pipe, the high-pressure water pipe extends upward into the vessel body and is connected to a water spray pipe, the outer circumference of the water spray pipe is provided with multiple spiral guide grooves distributed in a circle, each spiral guide groove is connected to the high-pressure water pipe, the water spray pipe is sleeved with a rotating spray pipe that can rotate relative to it, and the side wall of the rotating spray pipe is provided with multiple spray holes.

[0011] The present invention is further configured such that the outer diameter of the water spray pipe is larger than the outer diameter of the high-pressure water pipe, and the upper end of the rotating spray pipe is provided with a limiting ring that surrounds the high-pressure water pipe.

[0012] The present invention is further configured such that multiple vertically arranged connecting strips connect the outer wall of the evaporation cylinder and the inner wall of the kettle body.

[0013] The present invention is further configured such that the lower part of the vessel body is conical.

[0014] The present invention is further configured such that the outer periphery of the sealing plug is provided with an external thread, the inner wall of the lower part of the drain pipe is provided with an internal thread that is threadedly connected to the sealing plug, and the outer end of the sealing plug is provided with a knob.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] Firstly, by incorporating a vertically oriented evaporator with openings at both the top and bottom within the reactor vessel, and utilizing a circulating pump to circulate the liquid within the inner cavity of the evaporator's side wall, the surface area for liquid evaporation is significantly increased, effectively improving concentration efficiency. Simultaneously, the negative pressure tube design lowers the solvent's boiling point, further accelerating the evaporation rate and preventing damage to heat-sensitive substances from high temperatures.

[0017] Secondly, the combination of high-pressure water pipe and rotating nozzle can quickly clean the inside of the vessel after concentration, reducing the impact of residues on subsequent experiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 It is a partial sectional view used to show the internal structure of the vessel;

[0020] Figure 3 Used to demonstrate the connection between the rotating nozzle and the water spray pipe.

[0021] The components are as follows: 1. Kettle body; 2. Liquid addition pipe; 3. Negative pressure pipe; 4. Valve; 5. Liquid discharge pipe; 6. Sealing plug; 7. Knob; 8. Heating jacket; 9. Water outlet pipe; 10. Water inlet pipe; 11. Evaporation cylinder; 12. Connecting strip; 13. Circulation pump; 14. Circulation inlet pipe; 15. Circulation outlet pipe; 16. High-pressure water pipe; 17. Water spray pipe; 18. Spiral guide groove; 19. Rotating spray pipe; 20. Spray hole; 21. Limiting ring. Detailed Implementation

[0022] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the concentration vessel proposed in this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model. The same or similar reference numerals in the drawings represent the same or similar parts.

[0023] Example, refer to Figure 1-3A concentration vessel includes a vessel body 1, the lower part of which is conical. The upper end of the vessel body 1 is equipped with a liquid inlet pipe 2 and a negative pressure pipe 3. The liquid inlet pipe 2 is used to connect the extract to be concentrated. Both the liquid inlet pipe 2 and the negative pressure pipe 3 are equipped with a valve 4. The negative pressure pipe 3 is used to connect to a negative pressure pump. The lower end of the vessel body 1 is equipped with a drain pipe 5. The open end of the drain pipe 5 is detachably connected to a sealing plug 6. The outer circumference of the sealing plug 6 is provided with external threads, and the inner wall of the lower part of the drain pipe 5 is provided with internal threads that connect with the sealing plug 6. The outer end of the sealing plug 6 is equipped with a knob 7. The vessel body 1 is covered by a heating jacket 8. The heating jacket 8 is connected outwardly to a water outlet pipe 9 and a water inlet pipe 10, which are distributed vertically. Steam or hot water is introduced into the heating jacket 8 to heat the inside of the vessel body 1.

[0024] An evaporator 11 is vertically arranged and open at both the top and bottom of the vessel body 1. Multiple vertically arranged connecting strips 12 are connected between the outer wall of the evaporator 11 and the inner wall of the vessel body 1. The side wall of the evaporator 11 is open at the top and has a hollow structure. A circulation pump 13 is installed outside the vessel body 1. The upper part of the drain pipe 5 is connected to a circulation inlet pipe 14 that is connected to and communicates with the inlet end of the circulation pump 13. The outlet end of the circulation pump 13 is connected to and communicates with a circulation outlet pipe 15. The free end of the circulation outlet pipe 15 extends into the vessel body 1 and is connected to and communicates with the inner cavity of the side wall of the evaporator 11. The solution in the vessel body 1 is continuously circulated into the inner cavity of the side wall of the evaporator 11 by the circulation pump 13, and then flows out from its upper opening, flowing down the inner and outer walls of the evaporator 11 to increase the surface area of ​​the liquid, so that the extract is rapidly evaporated and concentrated on the inner and outer walls of the evaporator 11.

[0025] A high-pressure water pipe 16 is connected to the upper end of the vessel body 1. A valve 4 is installed on the high-pressure water pipe 16. The high-pressure water pipe 16 extends upward into the vessel body 1 and connects to a water spray pipe 17. Three spiral guide grooves 18 are arranged in a circular pattern on the outer periphery of the water spray pipe 17. Each spiral guide groove 18 is connected to the high-pressure water pipe 16. A rotating nozzle 19 is sleeved on the water spray pipe 17 and can rotate relative to it. The outer diameter of the water spray pipe 17 is larger than the outer diameter of the high-pressure water pipe 16. A limiting ring 21 is provided at the upper end of the rotating nozzle 19 to prevent the rotating nozzle 19 from slipping. Multiple spray holes 20 are opened on the side wall of the rotating nozzle 19. After the high-pressure water flows into the spiral guide grooves 18 along the high-pressure water pipe 16, the water flows downward in a spiral, which drives the rotating nozzle 19 to rotate around it continuously. The water flows out along the spray holes 20, effectively rinsing the inside of the vessel body 1 and the evaporation cylinder 11.

[0026] Working principle: When it is necessary to concentrate the extract in vessel 1, first open valve 4 on the liquid addition pipe 2 to add the extract into vessel 1, and then close valve 4. Next, start the negative pressure pump to extract the air from vessel 1 through negative pressure pipe 3, creating a negative pressure environment inside vessel 1 and lowering the boiling point of the solvent. Subsequently, steam or hot water is introduced into the heating jacket 8 to heat vessel 1. During the heating process, the extract in vessel 1 begins to evaporate upon heating.

[0027] At the same time, the circulation pump 13 is started. The solution in the vessel 1 enters the circulation pump 13 through the circulation inlet pipe 14 at the top of the drain pipe 5, and then flows into the inner cavity of the side wall of the evaporation cylinder 11 through the circulation outlet pipe 15. After flowing out from its upper opening, it flows down along the inner and outer walls of the evaporation cylinder 11. During this process, the liquid is in full contact with the inner and outer walls of the evaporation cylinder 11, which greatly increases the surface area of ​​the liquid, allowing the extract to be rapidly evaporated and concentrated on the inner and outer walls of the evaporation cylinder 11.

[0028] After concentration is complete, turn off the steam or hot water supply to the heating jacket 8 and stop the operation of the circulation pump 13 and the negative pressure pump. Then rotate the knob 7 on the sealing plug 6 at the opening end of the drain pipe 5 to remove the sealing plug 6 from the drain pipe 5, and the concentrated liquid can be discharged from the vessel body 1 through the drain pipe 5.

[0029] If it is necessary to rinse the inside of the vessel body 1 and the evaporation cylinder 11, the valve 4 on the high-pressure water pipe 16 can be opened. The high-pressure water flows into the spiral guide groove 18 along the high-pressure water pipe 16. Since the water flows downward in a spiral, it pushes the rotating nozzle 19 to rotate around the spray pipe 17 continuously. The water flows out along the spray hole 20 on the side wall of the rotating nozzle 19, thereby achieving effective rinsing of the inside of the vessel body 1 and the evaporation cylinder 11.

[0030] It should also be noted that all terms such as "set up" and similar descriptive words in this application (especially the specification) indicate that two structures have or exist a connection relationship. However, the specific means by which the two are connected are not limited in detail, and are usually conventional connection methods. That is, the means should be understood as prior art and do not need to be elaborated. For example, "m is set up with n" only indicates that structure m has structure n, and whether the two are connected by welding, riveting, adhesive, or integral molding is within the scope of protection of this application. Similarly, "x is rotatably set up with y" only indicates that y and x can rotate relative to each other, and whether the two are connected by a bearing, or whether y directly passes through x and is rotatably connected to x, or other feasible methods, are all within the scope of protection of this application.

[0031] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A concentration vessel, comprising a vessel body (1), wherein a liquid addition pipe (2) and a negative pressure pipe (3) are provided at the upper end of the vessel body (1), and both the liquid addition pipe (2) and the negative pressure pipe (3) are provided with valves (4); a drain pipe (5) is provided at the lower end of the vessel body (1), and a sealing plug (6) is detachably connected to the open end of the drain pipe (5), characterized in that, The vessel body (1) is covered with a heating sleeve (8). The heating sleeve (8) is connected to an outlet pipe (9) and an inlet pipe (10) that are distributed vertically. An evaporator (11) is connected inside the vessel body (1) and is vertically arranged with openings at both the top and bottom. The side wall of the evaporator (11) is open at the top and has a hollow structure. A circulation pump (13) is provided outside the vessel body (1). The upper part of the drain pipe (5) is connected to a circulation inlet pipe (14) that is connected to and communicates with the inlet end of the circulation pump (13). The outlet end of the circulation pump (13) is connected to and communicates with a circulation outlet pipe (15). The free end of the circulation outlet pipe (15) extends into the vessel body (1) and is connected to and communicates with the inner cavity of the side wall of the evaporator (11).

2. The concentration vessel according to claim 1, characterized in that, The upper end of the vessel body (1) is connected to a high-pressure water pipe (16), and a valve (4) is provided on the high-pressure water pipe (16). The high-pressure water pipe (16) extends upward into the vessel body (1) and is connected to a water spray pipe (17). The outer periphery of the water spray pipe (17) is provided with multiple spiral guide grooves (18) distributed in a circular pattern. Each spiral guide groove (18) is connected to the high-pressure water pipe (16). The water spray pipe (17) is covered with a rotating spray pipe (19) that can rotate relative to it. The side wall of the rotating spray pipe (19) is provided with multiple spray holes (20).

3. A concentration vessel according to claim 2, characterized in that, The outer diameter of the water spray pipe (17) is larger than the outer diameter of the high-pressure water pipe (16), and the upper end of the rotating spray pipe (19) is provided with a limiting ring (21) that surrounds the high-pressure water pipe (16).

4. A concentration vessel according to claim 1, characterized in that, Multiple vertically arranged connecting strips (12) connect the outer wall of the evaporator (11) to the inner wall of the vessel (1).

5. A concentration vessel according to claim 1, characterized in that, The lower part of the vessel body (1) is conical.

6. A concentration vessel according to claim 1, characterized in that, The sealing plug (6) has an external thread on its outer periphery, and the inner wall of the lower part of the drain pipe (5) has an internal thread that is threaded to the sealing plug (6). The outer end of the sealing plug (6) has a knob (7).

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