Self-circulation feed liquid evaporator

Abstract

The invention discloses a self-circulation feed liquid evaporator, and relates to the technical field of chemical pharmaceutical equipment, the self-circulation feed liquid evaporator comprises a heater, the heater heats feed liquid in an inner cavity of the heater to generate feed liquid foam, the heater is communicated with an evaporation chamber through a first pipeline, and the first pipeline is used for spraying the feed liquid foam to the inner wall of the evaporation chamber; the bottom of the evaporation chamber is provided with a second pipeline communicated with the heater, the second pipeline circulates the material liquid stored in the evaporation chamber into the heater, one end, deviating from the heater, of the evaporation chamber is communicated with a condenser, the condenser is used for condensing the evaporated solvent, the condenser is communicated with a liquid collector, and the liquid collector is communicated with the heater. The liquid collector is used for collecting the condensed solvent, so that the technical problems that a rising film foam mixture quickly falls back, the evaporation efficiency is low, a small amount of feed liquid is difficult to concentrate, and the residual feed liquid cannot be treated to be wasted due to short and straight communication between a heater and an evaporation chamber and lack of a large-area evaporation structure in a traditional evaporation system are solved.

Description

Technical Field

[0001] This invention relates to the field of chemical and pharmaceutical equipment technology, and in particular to a self-circulating feed liquid evaporator. Background Technology

[0002] In the fields of pharmaceuticals and chemicals, liquid concentration devices are generally used to concentrate and refine active ingredients. These devices typically employ a heater to heat low-concentration liquids, using rising film technology to generate a foam mixture within the heater. This foam mixture is then piped to an evaporation chamber, where it evaporates rapidly under negative pressure. In existing production equipment, the heater and evaporation chamber are connected by a short, straight pipe. The foam mixture generated by the rising film directly enters the evaporator and quickly falls to the bottom, returning to the heater. The evaporation chambers are often cylindrical, which fails to effectively increase the evaporation area and reduces evaporation efficiency. Furthermore, it is difficult to concentrate small amounts of liquid, resulting in waste of unprocessed residue.

[0003] In summary, developing an evaporator with a larger evaporation area, higher evaporation efficiency, and the ability to process small volumes of liquid medicine is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a self-circulating liquid evaporator, which solves the technical problems of traditional evaporation systems, which suffer from rapid fall of rising film foam mixture, low evaporation efficiency, difficulty in concentrating small amounts of liquid, and waste due to the lack of large-area evaporation structure and the short direct connection between the heater and the evaporation chamber.

[0005] To achieve the above objectives, the present invention provides a self-circulating feed liquid evaporator, comprising:

[0006] A heater heats the liquid inside its cavity to generate liquid foam. The heater is connected to an evaporation chamber via a first pipe, which sprays the liquid foam onto the inner wall of the evaporation chamber. The liquid evaporates on the inner wall of the evaporation chamber, separating the liquid from the solvent. A second pipe connected to the heater is located at the bottom of the evaporation chamber, which circulates the liquid accumulated in the evaporation chamber back into the heater. A condenser is connected to the end of the evaporation chamber away from the heater, which condenses the evaporated solvent. The condenser is connected to a collector, which collects the condensed solvent.

[0007] Preferably, the port of the first pipe extending into the evaporation chamber is provided with a connecting sleeve, the diameter of the connecting sleeve increases towards the end away from the heater, and a flow divider is provided on the outer edge of the port of the connecting sleeve away from the first pipe. Specifically, the flow divider is conical and coaxially arranged with the first pipe, and the diameter of the flow divider gradually decreases towards the end away from the first pipe.

[0008] Preferably, the evaporation chamber includes a connecting part that is connected to the outer wall of the heater. The end of the connecting part away from the heater is provided with a flow guide, which is specifically conical. The diameter of the flow guide increases towards the end away from the connecting part. The end of the flow guide away from the connecting part is provided with a sealing part for connecting to the condenser.

[0009] Preferably, the connecting part is coaxially arranged with the first pipeline, and the diameter of the connecting part is larger than the diameter of the first pipeline. A storage cavity is formed between the first pipeline and the connecting part. The storage cavity is used to receive the returned liquid. The connecting part is connected to the heater through the second pipeline.

[0010] Preferably, a condenser is provided between the evaporation chamber and the condenser, and the end of the condenser near the heater has a tapering section with the diameter of the tapering section gradually decreasing towards the heater.

[0011] Preferably, the second pipeline is equipped with a circulation assist device, which can be any one of a centrifugal pump, a mixed flow pump, or an axial flow pump.

[0012] Preferably, the evaporation chamber is connected to a vacuum pump, which is used to provide a negative pressure environment for the evaporation chamber.

[0013] Preferably, the liquid collector is provided with a partition plate inside, which is set at an angle to the axis of the liquid collector. The partition plate divides the inner cavity of the liquid collector into a first chamber and a second chamber. The first chamber is connected to the condenser. The outer wall of the liquid collector is provided with a first valve, which connects the first chamber and the second chamber.

[0014] Preferably, the outer wall of the liquid collector is provided with a second valve and a third valve. The second valve is connected to the first chamber, and the third valve is connected to the second chamber. The second valve discharges gas from the liquid collector to balance the pressure, and the third valve is used to discharge solvent.

[0015] Preferably, the liquid collector is connected to a transfer pump, which transfers the solvent in the first chamber to the second chamber.

[0016] Compared to the aforementioned background technology, the self-circulating liquid evaporator provided by the present invention includes: a heater, in which a liquid to be concentrated is contained within the inner cavity of the heater; the heater heats the liquid, and a large amount of foam mixture is generated during the heating process; a first pipe extends from the upper end of the heater and extends into the inner cavity of the evaporation chamber; the heater continuously heats the liquid, generating a large amount of foam mixture; the foam mixture overflows along the first pipe and is sprayed onto the side wall of the evaporation chamber; the foam mixture slides down the inner wall of the evaporation chamber, and during the sliding process, the solvent in the foam mixture evaporates, resulting in a liquid with a higher concentration flowing back to the bottom of the heating chamber; a second pipe extends from the side wall of the evaporation chamber, connecting the evaporation chamber to the inner cavity of the heater; the second pipe circulates the initially concentrated liquid back into the heater for a circulating concentration process; a condenser is connected to the top of the evaporation chamber, condensing and liquefying the evaporated solvent; the condenser is connected to a collector, which recovers the condensed solvent. The application itself sprays the foam mixture onto the inner wall of the evaporation chamber through the first pipeline, causing the liquid to flow downward along the inner wall of the evaporation chamber in a falling film manner, which greatly increases the evaporation area of ​​the liquid and improves the concentration efficiency of the liquid. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a self-circulating feed liquid evaporator provided in an embodiment of the present invention;

[0019] Figure 2 This is a first cross-sectional view of the evaporation chamber provided in an embodiment of the present invention;

[0020] Figure 3 This is a second cross-sectional view of the evaporation chamber provided in an embodiment of the present invention.

[0021] Among them, 1-heater; 2-evaporation chamber; 3-first pipeline; 31-diverter plate; 32-connecting sleeve; 4-second pipeline; 5-circulation booster device; 6-fog eliminator; 7-condenser; 8-liquid collector; 81-first valve; 82-second valve; 83-third valve; 84-partition plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] This invention provides a self-circulating feed liquid evaporator; please refer to the appendix of the instruction manual. Figure 1 This application includes a heater 1, the inner cavity of which contains a liquid to be concentrated. The heater 1 heats the liquid inside and generates a foam mixture using rising film technology. A first pipe 3 extends from the top of the heater 1 and communicates with the inner cavity of the heater 1. An evaporator is provided at the upper end of the heater 1, and the first pipe 3 extends into the inner cavity of the evaporator. As the heater 1 continues to heat, the liquid generates a large amount of foam mixture. The foam mixture gradually fills the inner cavity of the heater 1 and overflows into the first pipe 3. The first pipe 3 sprays the foam mixture onto the inner wall of an evaporation chamber 2. The foam mixture flows along the evaporation chamber 2... The liquid flows downwards along the sidewall, forming a uniform foam layer on the inner wall of the evaporation chamber 2, which greatly increases the evaporation area of ​​the liquid. After evaporation, the solvent inside the liquid flows from the top of the evaporation chamber 2 to the condenser 7. The concentrated liquid flows to the bottom of the evaporation chamber 2. Furthermore, a second pipe is provided on the sidewall at the bottom of the evaporation chamber 2, which connects the evaporation chamber 2 to the inner cavity of the heater 1. The concentrated liquid flows back to the heater 1 through the second pipe for another round of concentration. Meanwhile, the solvent vapor entering the condenser 7 is cooled and liquefied. The condenser 7 is connected to a liquid collector 8, which is used to recover the condensed solvent.

[0025] This application uses the first pipe 3 to spray the foamed liquid onto the inner wall of the evaporation chamber 2, increasing the evaporation area of ​​the liquid and improving the concentration efficiency of the liquid. In addition, the liquid is circulated through the second pipe 4 at the bottom of the evaporation chamber 2 to ensure that the liquid can be completely processed. The operator can also perform a concentration operation according to the target requirements to obtain the liquid of the target concentration.

[0026] Preferably, the evaporation chamber 2 is also connected to a vacuum pump, which is used to expel the air in the evaporation chamber 2, so that a negative pressure environment is formed inside the evaporation chamber 2. Under low pressure, the boiling point of the liquid solvent is lower, which accelerates the solvent evaporation rate.

[0027] Please refer to the instruction manual appendix. Figures 1 to 3A connecting sleeve 32 is provided on the outer wall of one end of the first pipe 3 extending into the evaporation chamber 2. The side wall of the connecting sleeve 32 is set at a certain angle to the axis of the first pipe 3. Preferably, the diameter of the connecting sleeve 32 increases towards the end away from the heater 1. A flow divider plate 31 is fixed at the end of the connecting sleeve 32 away from the heater 1. The flow divider plate 31 is specifically conical, and its diameter gradually decreases towards the end away from the first pipe 3 and is coaxial with the first pipe 3. A through hole is provided in the area of ​​the flow divider plate 31 opposite to the port of the first pipe 3. The diameter of the hole is equal to the maximum diameter of the connecting sleeve 32. When the heater 1 continuously heats the liquid, a large amount of foam mixture is generated. It passes through the hole through the first pipe 3, causing the foam mixture to overflow to the top of the diversion plate 31. The foam mixture flows down along the side wall of the diversion plate 31 and is thrown outward at the end of the diversion plate 31, so that the foam mixture is evenly coated on the inner wall of the evaporation chamber 2. The foam mixture flows down along the inner wall of the evaporation chamber 2, so that the foam mixture forms a uniform foam layer, which greatly increases the evaporation area of ​​the liquid. Furthermore, the flow divider 31 and the connecting sleeve 32 are detachably connected. Since the length of the first pipeline 3 is fixed, the height of the flow divider 31 in the evaporation chamber 2 is fixed. By adjusting the taper of the flow divider 31, the spraying angle of the foam mixture can be changed. The initial height of the foam mixture falling onto the inner wall of the evaporation chamber 2 is different, and the residence time of the foam mixture on the inner wall of the evaporation chamber 2 is different. The operator can select the appropriate flow divider 31 according to the physical properties of the liquid to prevent the liquid with high viscosity from being sprayed to a higher position on the inner wall of the evaporation chamber 2, which would result in the liquid staying on the inner wall of the evaporation chamber 2 for too long. After evaporation and concentration, the viscosity of the liquid will further increase, making it difficult to complete the concentration cycle normally.

[0028] Preferably, the evaporation chamber 2 includes a connecting part, which is fixedly connected to the side wall of the heater 1. A guide part is connected to the end of the connecting part away from the heater 1. The guide part is specifically conical, and its diameter increases towards the end away from the connecting part. A sealing part is provided at the end of the guide part away from the connecting part. The sealing part is specifically a cylindrical shell. The sealing part seals the port of the guide part. The connecting part, the guide part, and the sealing part form a sealed whole to prevent the liquid from overflowing from the evaporation chamber 2. Further, the connecting part is coaxially arranged with the first pipeline 3. It should be noted that the connecting part is not connected to the inner cavity of the heater 1. The diameter of the connecting part is larger than the diameter of the first pipeline 3. The first pipeline 3 and the connecting part are clamped to form a storage chamber. In one round of concentration process, the heater 1 heats the liquid and generates a foam mixture through rising film technology. The large-volume foam mixture overflows from the first pipeline into the connecting sleeve 32. The foam mixture overflows through the through hole to the upper end face of the diverter plate 31. The diverter plate 31 is conical, and the foam mixture flows along the side wall of the diverter plate 31. The foam mixture flows outward and is sprayed onto the cylindrical sidewall of the encapsulation section. The foam mixture forms a foam layer on the sidewall of the evaporation chamber 2. The solvent in the foam layer evaporates upon heating and enters the condenser 7 from the top of the evaporation chamber 2. The concentrated liquid is collected in the storage chamber through the guide section. A second pipe 4 is provided on the sidewall of the connection section. The second pipe 4 connects the storage chamber to the heater 1. The second pipe 4 recovers the liquid that has completed one round of concentration to the heating chamber for secondary concentration. The operator can select the number of times the liquid is concentrated according to the target concentration.

[0029] Preferably, a circulation assist device 5 is provided on the second pipeline 4. The circulation assist device 5 is used to draw the concentrated liquid in the evaporation chamber 2 and at the same time accelerate the flow rate of the foam mixture to prevent the foam mixture and liquid from carbonizing due to prolonged contact with the side wall of the heater 1, which would affect the color and quality of the concentrated liquid. The circulation assist device 5 can be any one of a centrifugal pump, a mixed flow pump, or an axial flow pump.

[0030] Furthermore, a condenser 7 is connected to the end of the evaporation chamber 2 away from the heater 1, and a mist eliminator 6 is installed between the condenser 7 and the heater 1. The mist eliminator 6 is used to collect the tiny foam mixture splashed out from the evaporation chamber 2. It should be noted that the mist eliminator 6 is mainly composed of wire mesh, wire mesh grid, support device, and shell. When the gas carrying mist passes through the wire mesh, the mist collides with and adheres to the wire mesh filaments under inertia, and then diffuses and condenses into large droplets on the surface of the wire mesh. Under the action of gravity, it falls, realizing gas-liquid separation, while intercepting solid impurities in the gas. The diameter of the lower end of the mist eliminator 6 gradually tapers towards the end closer to the heater 1, and the funnel-shaped bottom facilitates the recovery of the captured liquid. The tapering end of the mist eliminator 6 is connected to the heater 1 to complete the recovery of the liquid and avoid waste of raw materials and increased production costs.

[0031] Preferably, the cooler in the cooling assembly can be water-cooled or other high-performance refrigerant cooling methods. The cooling medium is selected according to the solvent properties of the feed liquid. For example, when concentrating feed liquids using solvents such as ethanol, the cooling assembly preferably uses a high-performance refrigerant to ensure that ethanol vapor can be quickly condensed, thereby improving the ethanol recovery efficiency. Furthermore, in one embodiment of this application, several stages of condensers 7 can be provided between the demister 6 and the collector 8, with a collector 8 connected below each stage of condenser 7. Through repeated condensation processes, the solvent is ensured to be fully liquefied and recovered.

[0032] Please continue to refer to the instruction manual appendix. Figure 1 A partition 84 is provided in the inner cavity of the liquid collector 8, which divides the inner cavity of the liquid collector 8 into a first chamber and a second chamber. The first chamber is connected to the condenser 7, but the first chamber and the second chamber are not connected in the inner cavity of the liquid collector 8. A first valve 81 is provided on the side wall of the liquid collector 8. Both the inlet and outlet of the first valve 81 are connected by connecting pipes, which connect the first chamber and the second chamber. Preferably, the partition 84 is set at a certain angle to the axis of the liquid collector 8, and the lower end of the inclined surface of the partition 84 is opposite to the connecting pipe of the first valve 81. After the first valve 81 is opened, the condensed solvent flows from the first chamber into the second chamber. The liquid collector 8 with such a structure can close the first valve 81 in time to prevent the internal temperature of the evaporation chamber 2 and the heater 1 from dropping after they stop operating, forming a negative pressure to back-suction the condensed solvent, which would affect the final concentration effect of the liquid. In addition, a second valve 82 and a third valve 83 are provided on the outer wall of the liquid collector 8. The second valve 82 is connected to the first chamber, and the third valve 83 is connected to the second chamber. The second valve 82 is used to discharge the gas entering the liquid collector 8 to ensure the pressure balance inside and outside the liquid collector 8, while the third valve 83 is used to discharge the collected solvent.

[0033] A transfer pump is also provided on the outside of the liquid collector 8. The transfer pump is used to transport the solvent in the first chamber to the second chamber.

[0034] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0035] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A self-circulating feed liquid evaporator characterized by, The application relates to a heater (1) which heats liquid in a cavity of the heater (1) to generate liquid foam, the heater (1) is communicated with an evaporation chamber (2) through a first pipeline (3), the first pipeline (3) is used for spouting the liquid foam to an inner wall of the evaporation chamber (2), the liquid is evaporated on the inner wall of the evaporation chamber (2) to separate the liquid from solvent, a bottom of the evaporation chamber (2) is provided with a second pipeline (4) communicated with the heater (1), the second pipeline (4) circulates the accumulated liquid in the evaporation chamber (2) to the heater (1), an end of the evaporation chamber (2) away from the heater (1) is communicated with a condenser (7), the condenser (7) is used for condensing the evaporated solvent, the condenser (7) is communicated with a liquid collector (8), and the liquid collector (8) is used for collecting the condensed solvent. The end of the first pipeline (3) extending into the port of the evaporation chamber (2) is provided with a connecting sleeve (32), the diameter of the connecting sleeve (32) increases away from the end of the heater (1), an outer edge of the end of the connecting sleeve (32) away from the port of the first pipeline (3) is provided with a flow distribution plate (31), the flow distribution plate (31) is conical and coaxially arranged with the first pipeline (3), and the diameter of the flow distribution plate (31) gradually decreases away from the first pipeline (3).

2. The self-circulating liquid evaporator of claim 1, wherein, The evaporation chamber (2) comprises a connecting part connected with the outer wall of the heater (1), an end of the connecting part away from the heater (1) is provided with a flow guiding part, the flow guiding part is conical, the diameter of the flow guiding part increases away from the connecting part, and an end of the flow guiding part away from the connecting part is provided with an encapsulating part used for communicating with the condenser (7).

3. The self-circulating liquid evaporator of claim 2, wherein, The connecting part is coaxially arranged with the first pipeline (3), the diameter of the connecting part is larger than that of the first pipeline (3), a storage cavity is formed between the first pipeline (3) and the connecting part, the storage cavity is used for receiving the backflow liquid, and the connecting part is communicated with the heater (1) through the second pipeline (4).

4. The self-circulating liquid evaporator of claim 3, wherein, A foam catcher (6) is arranged between the evaporation chamber (2) and the condenser (7), an end of the foam catcher (6) close to the heater (1) is provided with a tapered part, and the diameter of the tapered part gradually decreases away from the side close to the heater (1).

5. The self-circulating liquid evaporator of claim 3, wherein, A circulating assisting device (5) is arranged on the second pipeline (4), and the circulating assisting device (5) can be any one of a centrifugal pump, a mixed flow pump and an axial flow pump.

6. The self-circulating liquid evaporator of claim 1, wherein, The evaporation chamber (2) is communicated with a vacuum pump, and the vacuum pump is used for providing a negative pressure environment for the evaporation chamber (2).

7. The self-circulating liquid evaporator of claim 6, wherein, ​ 8. The self-circulating liquid evaporator of claim 7, wherein, The liquid collector (8) is internally provided with a partition (84) which is arranged at an angle to the axis of the liquid collector (8), and which separates the inner cavity of the liquid collector (8) into a first chamber and a second chamber, the first chamber being in communication with the condenser (7), and the outer wall of the liquid collector (8) being provided with a first valve (81) which communicates the first chamber with the second chamber.

9. The self-circulating liquid evaporator of claim 8, wherein, The outer wall of the liquid collector (8) is provided with a second valve (82) and a third valve (83), the second valve (82) being in communication with the first chamber, and the third valve (83) being in communication with the second chamber, the second valve (82) being used to discharge the gas in the liquid collector (8) to balance the pressure, and the third valve (83) being used to discharge the solvent.

10. The self-circulating liquid evaporator of claim 9, wherein, The liquid collector (8) is in communication with a transport pump, and the transport pump is used to transport the solvent in the first chamber into the second chamber.

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