A thin film evaporation system

Abstract

This utility model discloses a thin-film evaporation system, comprising a first reaction vessel, a second reaction vessel, a thin-film evaporation mechanism, a temporary storage vessel, and a Roots pump. The thin-film evaporation mechanism consists of a thin-film evaporator, a heavy component buffer tank, and a light component buffer assembly. The system adopts a bidirectional material circulation design: the feed liquid in the first reaction vessel is processed by the thin-film evaporator, and the light components enter the second reaction vessel via the light component buffer assembly and the temporary storage vessel; the heavy components enter the second reaction vessel via the heavy component buffer tank and the temporary storage vessel. The feed liquid in the second reaction vessel can also be processed by the thin-film evaporator, with the light and heavy components passing through the light component buffer assembly and the heavy component buffer tank respectively, and finally flowing back to the first reaction vessel via the temporary storage vessel. This design effectively reduces system flow fluctuations and improves evaporation efficiency through the buffering effect of the temporary storage vessel.

Description

Technical Field

[0001] This utility model relates to the field of chemical evaporation devices, and more particularly to a thin-film evaporation system. Background Technology

[0002] Thin-film evaporation systems are a highly efficient separation technology that enables high-speed heat transfer and efficient evaporation of materials. This system is widely used in the chemical, pharmaceutical, food, and fine chemical industries, and is particularly suitable for the concentration, solvent removal, and purification of high-viscosity, heat-sensitive, or easily foaming materials.

[0003] However, in existing thin-film evaporation systems, after the feed liquid in the first reactor is delivered to the thin-film evaporator in the thin-film evaporation system, the resulting subsequent feed liquid undergoes changes in physical properties. If the head of the gear pump in the thin-film evaporator used to deliver the subsequent feed liquid is insufficient, problems such as flow fluctuations and decreased evaporation efficiency will occur. In severe cases, it will lead to interruption of material delivery in subsequent processes, forcing the system to shut down and making it impossible to resume production.

[0004] Therefore, there is an urgent need to propose a thin-film evaporation system to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a thin-film evaporation system that can reduce fluctuations in the reflow rate of the thin-film evaporation system and improve evaporation efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution: This utility model provides a thin-film evaporation system, characterized in that it includes: First reactor; Second reactor; A thin-film evaporation mechanism includes a thin-film evaporator connected to the first reaction vessel, a heavy component buffer tank connected to the thin-film evaporator, and a light component buffer assembly connected to the thin-film evaporator. A temporary storage vessel, which is respectively connected to the heavy component buffer tank, the second reaction vessel and the light component buffer assembly; A Roots pump, which is connected to the light component buffer assembly and is able to maintain the thin film evaporation system under vacuum; In this process, the feed liquid in the first reaction vessel is processed by the thin-film evaporator to obtain light and heavy components. The light components are sequentially fed into the light component buffer assembly, the temporary storage vessel, and the second reaction vessel, while the heavy components are sequentially fed into the heavy component buffer tank, the temporary storage vessel, and the second reaction vessel; or The feed liquid in the second reactor is processed by the thin-film evaporator to obtain light components and heavy components. The obtained light components are sequentially fed into the light component buffer assembly, the temporary storage vessel, and the first reactor, while the obtained heavy components are sequentially fed into the heavy component buffer tank, the temporary storage vessel, and the first reactor.

[0007] Preferably, the thin-film evaporation system further includes a nitrogen pressurization system and a feed pump connected to the temporary storage vessel. The nitrogen pressurization system applies pressure to the temporary storage vessel to induce the light component or the heavy component temporarily stored in the temporary storage vessel to enter the second reaction vessel. The feed pump can supply the liquid in the first reaction vessel to the thin-film evaporation mechanism.

[0008] Preferably, the thin-film evaporation mechanism includes a preheater connected to the first reaction vessel and the thin-film evaporator respectively, and an oil pump connected to the thin-film evaporator and the preheater respectively. The oil pump can pump oil to the preheater and the thin-film evaporator respectively. When the liquid passes through the thin-film evaporation mechanism, it is first preheated by the preheater and then enters the thin-film evaporator for evaporation.

[0009] Preferably, the thin-film evaporation system further includes a first supply pump connected to the heavy component buffer tank, the first supply pump being able to pump the heavy components in the heavy component buffer tank to the temporary storage vessel.

[0010] Preferably, the light component buffer assembly includes a condenser connected to the thin-film evaporator and a light component buffer tank connected to the condenser. The feed liquid is condensed into the light component under the action of the condenser, and the condensed light component enters the light component buffer tank.

[0011] Preferably, the light component buffer assembly further includes a heater connected to the condenser and used to heat the feed liquid passing through the condenser.

[0012] Preferably, the light component buffer assembly further includes a second supply pump connected to the light component buffer tank and used to pump the light component from the light component buffer tank to the temporary storage vessel.

[0013] Beneficial effects: During system operation, the liquid in the first reactor is first transferred to a thin-film evaporator for separation. In the first three cycles, only heavy components are distilled off, entering a temporary storage vessel and then transferred to the second reactor; no material passes through the light component buffer assembly. Subsequently, the liquid in the second reactor is transferred to the thin-film evaporator, where heavy components are again distilled off, entering a temporary storage vessel and then transferred to the first reactor; again, no material passes through the light component buffer assembly. The liquid in the first reactor is then fed back into the thin-film evaporator, where heavy components are distilled off, entering a temporary storage vessel and then being transferred back to the second reactor; again, no material passes through the light component buffer assembly. In the fourth cycle, the operating temperature of the thin-film evaporator is increased to separate the liquid in the second reactor. The distilled light components enter a temporary storage vessel and are then transferred to the first reactor, while the heavy components are directly discharged from the system. This process is repeated sequentially until the target liquid material is fully separated from the solvent or impurities. Finally, the obtained desired liquid material is pressurized and transferred to the next process.

[0014] This embodiment effectively overcomes the material conveying bottleneck caused by insufficient head of the gear pump built into the thin-film evaporator by adding a temporary storage vessel between the first and second reaction vessels. This design significantly reduces system flow fluctuations, improves the stability and overall efficiency of the evaporation process, and avoids the cost and system complexity associated with adding additional reaction vessels or high-power pumps to increase the head. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a thin-film evaporation system provided in an embodiment of the present invention.

[0017] In the picture: 1. First reaction vessel; 2. Second reactor; 3. Thin-film evaporation mechanism; 31. Thin-film evaporator; 32. Heavy component buffer tank; 33. Light component buffer assembly; 331. Condenser; 332. Light component buffer tank; 333. Heater; 334. Second supply pump; 34. Preheater; 35. Oil pump; 36. First supply pump; 4. Temporary storage container; 5. Roots pump; 6. Nitrogen pressurization system; 7. Feed pump. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0022] Figure 1 This is a schematic diagram of a thin-film evaporation system provided in an embodiment of this utility model. Figure 1As shown, this embodiment provides a thin-film evaporation system, which includes a first reaction vessel 1, a second reaction vessel 2, a thin-film evaporation mechanism 3, a temporary storage vessel 4, and a Roots pump 5. The thin-film evaporation mechanism 3 includes a thin-film evaporator 31 connected to the first reaction vessel 1, a heavy component buffer tank 32 connected to the thin-film evaporator 31, and a light component buffer assembly 33 connected to the thin-film evaporator 31. The temporary storage vessel 4 is connected to the heavy component buffer tank 32, the second reaction vessel 2, and the light component buffer assembly 33. The Roots pump 5 is connected to the light component buffer assembly 33 and is capable of maintaining the thin-film evaporation system in a vacuum state. The feed liquid in the first reaction vessel 1 is processed by the thin-film evaporator 31 to obtain light and heavy components. The obtained light components sequentially enter the light component buffer assembly 33, the temporary storage vessel 4, and the second reaction vessel 2, while the obtained heavy components sequentially enter the heavy component buffer tank 32, the temporary storage vessel 4, and the second reaction vessel 2. Alternatively, the liquid in the second reactor 2 is processed by the thin film evaporator 31 to obtain light components and heavy components. The obtained light components are sequentially fed into the light component buffer assembly 33, the temporary storage vessel 4 and the first reactor 1, and the obtained heavy components are sequentially fed into the heavy component buffer tank 32, the temporary storage vessel 4 and the first reactor 1.

[0023] In this embodiment, the thin-film evaporation system operates as follows: First, the liquid in the first reaction vessel 1 is transported to the thin-film evaporator 31 for separation. In the first three cycles of the thin-film evaporator 31, only heavy components are distilled off. These heavy components enter the temporary storage vessel 4 and are then transported to the second reaction vessel 2, while no material passes through the light component buffer assembly 33. Subsequently, the liquid in the second reaction vessel 2 is transported to the thin-film evaporator 31, where heavy components are again distilled off. These heavy components enter the temporary storage vessel 4 and are then transferred to the first reaction vessel 1, again with no material passing through the light component buffer assembly 33. The liquid in the first reaction vessel 1 is then fed back into the thin-film evaporator 31, where heavy components are distilled off. These heavy components enter the temporary storage vessel 4 and are then transported back to the second reaction vessel 2, with no material passing through the light component buffer assembly 33. In the fourth cycle, the operating temperature of the thin-film evaporator 31 is increased to separate the liquid in the second reaction vessel 2. The distilled light components enter the temporary storage vessel 4 and are then transferred to the first reaction vessel 1, while the heavy components are directly discharged from the system. The above process is executed sequentially and cyclically until the target liquid material is fully separated from the solvent or impurities; finally, the obtained liquid material is pressurized and transported to the next process.

[0024] This embodiment effectively overcomes the material conveying bottleneck caused by the insufficient head of the gear pump built into the thin-film evaporator 31 by adding a temporary storage vessel 4 between the first reaction vessel 1 and the second reaction vessel 2. This design significantly reduces system flow fluctuations, improves the stability and overall efficiency of the evaporation process, and avoids the cost and system complexity caused by adding an extra reaction vessel or high-power pump to increase the head.

[0025] Furthermore, the thin-film evaporation system also includes a nitrogen pressurization system 6 connected to the temporary storage vessel 4 and a feed pump 7. The nitrogen pressurization system 6 applies pressure to the temporary storage vessel 4 to induce the light or heavy components temporarily stored in the temporary storage vessel 4 to enter the second reaction vessel 2. The feed pump 7 supplies the liquid from the first reaction vessel 1 to the thin-film evaporation unit 3. Using nitrogen to pressurize the temporary storage vessel 4 can reduce the impact of the pressurized gas on the light and heavy components while simultaneously pressurizing them.

[0026] Furthermore, the thin-film evaporation mechanism 3 includes a preheater 34 connected to the first reaction vessel 1 and the thin-film evaporator 31 respectively, and an oil pump 35 connected to both the thin-film evaporator 31 and the preheater 34. The oil pump 35 pumps oil to the preheater 34 and the thin-film evaporator 31 respectively. The liquid material is preheated by the preheater 34 before entering the thin-film evaporator 31 for evaporation. By heating the material before it enters the thin-film evaporator 31, the heat load required for the liquid material to reach the evaporation temperature in the thin-film evaporator 31 can be significantly reduced, allowing the liquid material to enter the thin-film evaporator 31 at a temperature closer to the operating temperature, thus improving the long-term stability of the thin-film evaporation system.

[0027] Furthermore, the thin-film evaporation system also includes a first supply pump 36 connected to the heavy component buffer tank 32. The first supply pump 36 can pump the heavy components in the heavy component buffer tank 32 to the temporary storage vessel 4, thereby realizing the transfer of heavy components. In this embodiment, the first supply pump 36 is a gear pump. In other embodiments, other supply pumps with the above-mentioned effects can also be used. This embodiment does not specifically limit this, and any supply pump that can achieve the above-mentioned effects is within the protection scope of this disclosure.

[0028] Furthermore, the light component buffer assembly 33 includes a condenser 331 connected to the thin film evaporator 31 and a light component buffer tank 332 connected to the condenser 331. The feed liquid is condensed into light components under the action of the condenser 331, and the condensed light components enter the light component buffer tank 332, thereby separating the light components in the feed liquid and temporarily storing them in the light component buffer tank 332.

[0029] Furthermore, the light component buffer assembly 33 also includes a heater 333 connected to the condenser 331 and used to heat the liquid passing through the condenser 331. The heater 333 can reduce the possibility of the liquid in the condenser 331 crystallizing in winter, thereby reducing the occurrence of pipeline blockage.

[0030] Furthermore, the light component buffer assembly 33 also includes a second supply pump 334 connected to the light component buffer tank 332 and used to pump the light components in the light component buffer tank 332 to the temporary storage vessel 4, thereby realizing the transfer of light components. In this embodiment, the second supply pump 334 is a gear pump. In other embodiments, other supply pumps with the above-mentioned effects may also be used. This embodiment does not specifically limit this, and any supply pump that can achieve the above-mentioned effects is within the protection scope of this disclosure.

[0031] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A thin-film evaporation system, characterized in that, include: First reactor; Second reactor; A thin-film evaporation mechanism includes a thin-film evaporator connected to the first reaction vessel, a heavy component buffer tank connected to the thin-film evaporator, and a light component buffer assembly connected to the thin-film evaporator. A temporary storage vessel, which is respectively connected to the heavy component buffer tank, the second reaction vessel and the light component buffer assembly; A Roots pump, which is connected to the light component buffer assembly and is able to maintain the thin film evaporation system under vacuum; In this process, the feed liquid in the first reaction vessel is processed by the thin-film evaporator to obtain light and heavy components. The light components are sequentially fed into the light component buffer assembly, the temporary storage vessel, and the second reaction vessel, while the heavy components are sequentially fed into the heavy component buffer tank, the temporary storage vessel, and the second reaction vessel; or The feed liquid in the second reactor is processed by the thin-film evaporator to obtain light components and heavy components. The obtained light components are sequentially fed into the light component buffer assembly, the temporary storage vessel, and the first reactor, while the obtained heavy components are sequentially fed into the heavy component buffer tank, the temporary storage vessel, and the first reactor.

2. The thin-film evaporation system according to claim 1, characterized in that, The thin-film evaporation system also includes a nitrogen pressurization system and a feed pump connected to the temporary storage vessel. The nitrogen pressurization system applies pressure to the temporary storage vessel to cause the light component or the heavy component temporarily stored in the temporary storage vessel to enter the second reaction vessel. The feed pump can supply the liquid in the first reaction vessel to the thin-film evaporation mechanism.

3. The thin-film evaporation system according to claim 1, characterized in that, The thin-film evaporation mechanism includes a preheater connected to the first reaction vessel and the thin-film evaporator respectively, and an oil pump connected to the thin-film evaporator and the preheater respectively. The oil pump can pump oil to the preheater and the thin-film evaporator respectively. When the liquid passes through the thin-film evaporation mechanism, it is first preheated by the preheater and then enters the thin-film evaporator for evaporation.

4. The thin-film evaporation system according to claim 3, characterized in that, The thin-film evaporation system further includes a first supply pump connected to the heavy component buffer tank, the first supply pump being able to pump the heavy components in the heavy component buffer tank to the temporary storage vessel.

5. The thin-film evaporation system according to claim 3, characterized in that, The light component buffer assembly includes a condenser connected to the thin-film evaporator and a light component buffer tank connected to the condenser. The feed liquid is condensed into the light component under the action of the condenser, and the condensed light component enters the light component buffer tank.

6. The thin-film evaporation system according to claim 5, characterized in that, The light component buffer assembly also includes a heater connected to the condenser and used to heat the feed liquid passing through the condenser.

7. The thin-film evaporation system according to claim 5, characterized in that, The light component buffer assembly further includes a second supply pump connected to the light component buffer tank and used to pump the light component from the light component buffer tank to the temporary storage vessel.

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