Method and device for purifying flash evaporation solvent

Abstract

The invention provides a method and a device for purifying a flash solvent, which solve the problems of slow pressure regulation rate and the like of a flash chamber, the device comprises a feeding assembly, the feeding assembly is connected with the flash chamber, the flash chamber is connected with a liquid phase collection assembly and a gas phase collection assembly, the gas phase collection assembly is connected with a condensation assembly, and a dispersion assembly is arranged in the flash chamber. And the flash chamber is connected with a graded pressure regulating assembly opposite to the dispersing assembly. The device has the advantages of high pressure regulation response rate, good purification effect and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of flash spinning, and in particular relates to a flash solvent purification method and device. Background Art

[0002] Flash purification systems primarily separate and purify substances based on the differences in volatility of components during the flash evaporation process. After a liquid mixture is heated to a certain temperature, it passes through a pressure-reducing valve and enters a flash chamber at a lower pressure. During this process, the sudden drop in pressure causes volatile components to rapidly vaporize, while less volatile components remain in the liquid phase. The vaporized vapor is then condensed and collected, achieving the desired purification. The solvent volatilized during flash spinning often carries trace impurities, primarily heavy components generated by the heating of PE. Therefore, a flash purification system is required to further purify these impurities, otherwise they will accumulate in the system. These heavy components can severely degrade spinning quality and cause a range of problems, such as plaque, crystals, odor, and broken yarns. In actual flash evaporation processes, the pressure regulation within the flash chamber typically follows a linear function. This pressure regulation response is slow when separating different impurities, and the adjustment range is also limited by the power of the vacuum pump.

[0003] To address the shortcomings of existing technologies, researchers have conducted extensive research and proposed various solutions. For example, a Chinese patent document discloses a special polymer flash precipitation reactor [201220516590.X], which includes a reaction chamber surrounded by a shell, an agitator extending from the shell into the reaction chamber, and a heating device for heating the reaction chamber. The agitator's main shaft is connected to a drive motor, and the shell is equipped with a solution inlet, a vacuum port, and a discharge outlet.

[0004] The above solution solves the problem of solvent purification to a certain extent, but it still has many shortcomings, such as slow pressure regulation response rate of the flash chamber and limited regulation range. Summary of the Invention

[0005] The object of the present invention is to provide a flash solvent purification device with a reasonable design and a fast pressure regulation response rate in order to solve the above problems.

[0006] Another object of the present invention is to provide a flash solvent purification method with a larger pressure adjustment range in order to solve the above problems.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a flash solvent purification device, comprising a feed assembly, the feed assembly is connected to a flash chamber, the flash chamber is connected to a liquid phase collection assembly and a gas phase collection assembly, the gas phase collection assembly is connected to a condensation assembly, the flash chamber has a built-in dispersion assembly, and the flash chamber is connected to a graded pressure regulating assembly opposite to the dispersion assembly.

[0008] In the above purification device for flash evaporation solvent, the feeding assembly includes a feeding pipe and a feeding pump. A pressure sensor and a flowmeter are installed on the feeding pipe. A temperature sensor is installed at the junction of the feeding pipe and the flash evaporation chamber. The feeding pipe is connected to a pressure relief pipe and a buffer pipe through a distribution valve, and the buffer pipe is connected to a buffer tank.

[0009] In the above purification device for flash evaporation solvent, the flash evaporation chamber includes a main tank body. The bottom of the main tank body is spherical and funnel-shaped at the bottom. The main tank body has a support frame body distributed circumferentially and extending to the bottom. A pressure-bearing assembly is arranged between the support frame body and the main tank body.

[0010] In the above purification device for flash evaporation solvent, the pressure-bearing assembly includes a pressure-bearing ring surrounding the main tank body circumferentially. The pressure-bearing rings are arranged axially along the outer wall of the main tank body. Triangular pressure-bearing ribs are connected between adjacent pressure-bearing rings. A bearing plate arranged in central symmetry is provided at the lower end of the main tank body. Pressure-bearing hoop rings are fixed at the intersections of the top, bottom and middle of the main tank body.

[0011] In the above purification device for flash evaporation solvent, the dispersion assembly includes a spray pipe arranged inside the main tank body and extending along the central axis. The upper end of the spray pipe is communicated with the feeding assembly. An evaporation nozzle is installed at the lower end of the spray pipe. The evaporation nozzle has eight dispersion claws arranged in central symmetry and extending outwards. Spray holes facing upwards are evenly distributed on the dispersion claws.

[0012] In the above purification device for flash evaporation solvent, the stepwise pressure regulating assembly includes several integrated pressure regulating tanks. The pressure regulating tanks are cylindrical and are respectively connected to oil-free vacuum pumps with different rated flow rates. The pressure regulating tanks are communicated with the flash evaporation chamber through pressure regulating pipes. A stop valve and a pressure sensor are installed between the pressure regulating pipe and the flash evaporation chamber. A dynamic regulating assembly is installed inside the pressure regulating tank.

[0013] In the above purification device for flash evaporation solvent, the dynamic regulating assembly includes an adjusting screw rod extending along the central axis of the pressure regulating tank and rotatably connected to the pressure regulating tank. The adjusting screw rod is in transmission connection with an adjusting motor. The adjusting screw rod is threadedly connected with an adjusting disc. A limiting guide rail is slidably installed between the adjusting plate and the inner wall of the pressure regulating tank. A sealing piece pressing against the inner wall of the pressure regulating tank is installed on the adjusting disc. The adjusting disc divides the interior of the pressure regulating tank into a negative pressure chamber and a positive pressure chamber. The negative pressure chamber is communicated with the flash evaporation chamber through the pressure regulating pipe and is also communicated with the oil-free vacuum pump. The positive pressure chamber is communicated with the flash evaporation chamber through an air inlet pipe. A stop valve and a pressure sensor are installed on the air inlet pipe.

[0014] In the above purification device for flash evaporation solvent, the liquid-phase collection assembly includes a drain pipe connected to the lower end of the flash chamber. The drain pipe is communicated with the solvent tank through a drain pump, and a check valve and a stop valve are installed on the drain pipe; the gas-phase collection assembly includes a gas collection tray connected to the upper end of the flash chamber. The gas collection tray is flat and several collection pipelines are connected to the upper end. The collection pipelines are equipped with a temperature sensor, a pressure sensor and a flow meter. The collection pipelines are connected to a condensation tank, and the condensation assembly is installed in the condensation tank.

[0015] In the above purification device for flash evaporation solvent, the condensation assembly includes a condensation pipe coiled and arranged in the condensation tank. The condensation pipe is a molecular sieve membrane pipe. A porous support is arranged inside the condensation pipe and a molecular sieve layer is arranged outside. The condensation pipe and the condensation tank are separated by a partition board into several independent separation chambers. The separation chambers are respectively connected with separation pipes through oil-free vacuum pumps. The pore diameters of the molecular sieve layers of the condensation pipes corresponding to the separation chambers are different; condensation fins are arranged inside the separation chambers, and the condensation fins are connected with heat dissipation copper pipes.

[0016] A purification method for flash evaporation solvent adopts the above purification method and device for flash evaporation solvent, and includes the following steps: S1: The feeding assembly inputs the high-temperature and high-pressure solvent from the external storage tank into the flash chamber; S2: After the solvent enters the flash chamber, it undergoes pressure reduction and flash evaporation. Part of the steam directly solidifies and is collected and exported by the liquid-phase collection assembly, and the other part is input into the gas-phase collection assembly; S3: The dispersion assembly introduces the solvent into the flash chamber for flash evaporation, and the stepwise pressure regulation assembly adjusts the internal pressure of the flash chamber step by step; S4: The condensation assembly in the gas-phase collection assembly separates the steam. The separated and condensed solvent is collected and introduced into the external storage tank, and the non-condensable solvent steam is exported and centrally processed.

[0017] Compared with the existing technology, the advantages of the present invention are as follows: The flash chamber is connected with a stepwise pressure regulation assembly, which adjusts the original pressure regulation of the flash chamber from a linear function change to a stepwise change, so as to adapt to the flash separation and regulation requirements of different solvent components, improve the regulation rate to reduce the solvent impurities after separation; the flash evaporation is adjusted adaptively, and the bearing strength is improved by means of local strengthening, so as to adapt to the stepwise change of the internal pressure; the gas-phase collection assembly and the condensation assembly purify the solvent deeply, and further improve the separation purity of the solvent. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the device of the present invention; Figure 2 is a schematic structural diagram of the flash chamber of the present invention; Figure 3 is a structural sectional view of the flash chamber of the present invention; Figure 4 It is a schematic structural diagram of the hierarchical pressure regulating component of the present invention; Figure 5 It is a schematic structural diagram of the dynamic regulating component of the present invention; Figure 6 It is a structural sectional view of the condensation tank of the present invention; Figure 7 It is a working principle diagram of the condensation pipe of the present invention; In the figure, there are a feed component 1, a feed pipe 11, a pressure relief pipe 12, a buffer pipe 13, a buffer tank 14, a flash chamber 2, a main tank body 21, a support frame body 22, a pressure-bearing ring 23, a pressure-bearing rib 24, a pressure-bearing plate 25, a pressure-bearing hoop 26, a liquid-phase collection component 3, a drain pipe 31, a solvent tank 32, a gas-phase collection component 4, a gas collection tray 41, a collection pipeline 42, a condensation tank 43, a condensation component 5, a condensation pipe 51, a partition plate 52, a separation chamber 53, a separation pipe 54, a condensation fin 55, a heat dissipation copper pipe 56, a dispersion component 6, a spray pipe 61, an evaporation nozzle 62, a dispersion claw 63, a hierarchical pressure regulating component 7, a pressure regulating tank 71, a pressure regulating pipe 72, a dynamic regulating component 8, an adjusting screw 81, an adjusting motor 82, an adjusting disc 83, a limiting guide rail 84, a sealing sheet 85, a negative pressure chamber 86, a positive pressure chamber 87, and an intake pipe 88. Specific Embodiments

[0019] The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.

[0020] As Figures 1-7 shown, a purification device for flash evaporation of a solvent includes a feed component 1 communicated with an external storage tank. The feed component 1 is connected to a flash chamber 2, and the high-temperature and high-pressure solvent is input into the flash chamber 2 by the feed component 1. The flash chamber 2 is connected with a liquid-phase collection component 3 and a gas-phase collection component 4, and the solvent evaporates inside the flash chamber 2 and undergoes primary separation and purification. The gas-phase collection component 4 is connected with a condensation component 5 to perform secondary purification on the solvent. A dispersion component 6 is arranged inside the flash chamber 2. The flash chamber 2 is connected with a hierarchical pressure regulating component 7 opposite to the dispersion component 6. The hierarchical pressure regulating component 7 adjusts the vacuum degree inside the flash chamber 2 step by step according to the separation requirements of the internal components of the solvent, and assists the vacuum pump to maintain pressure stability when adjusting to the specified vacuum degree.

[0021] Specifically, the feeding assembly 1 includes a feed pipe 11 and a feed pump. The feed pump pressurizes the solvent. The feed pipe 11 is usually equipped with an electric heating component for active heating, and cooperates with a temperature sensor to maintain its high-temperature and high-pressure state. A pressure sensor and a flow meter are installed on the feed pipe 11. A temperature sensor is installed at the junction of the feed pipe 11 and the flash chamber 2. The feed pipe 11 is connected to a pressure relief pipe 12 and a buffer pipe 13 through a distribution valve. The buffer pipe 13 is connected to a buffer tank 14. When the pressure sensor detects that the internal pressure of the feed pipe 11 is too high, the distribution valve controls the pressure relief pipe 12 to perform emergency pressure relief. The buffer pipe 13 and the buffer tank 14 maintain the pressure stability of the feed pipe 11. When the solvent starts to be input or stops outputting, the diaphragm-type buffer tank 14 effectively alleviates the internal impact of the feed pipe 11.

[0022] In-depth, different from the existing flash structures, the flash chamber 2 in this embodiment includes a main tank body 21 made of stainless steel, and the main tank body 21 is usually equipped with a thermal insulation sandwich structure. The bottom of the main tank body 21 is spherical and funnel-shaped at the bottom to guide the solvent to concentrate. The main tank body 21 has a support frame body 22 distributed circumferentially and extending to the bottom. A pressure-bearing component is arranged between the support frame body 22 and the main tank body 21. The support frame body 22 and the pressure-bearing component cooperate, and the two jointly maintain the flash chamber 2 in a vertical state, and at the same time enable the main tank body 21 to withstand external pressure. When the internal and external pressure difference changes in a stepped manner, the pressure-bearing component prevents the main tank body 21 from deforming.

[0023] Further, different from the existing tank strengthening structures, the pressure-bearing component in this embodiment mainly bears external air pressure. Therefore, a pressure-bearing ring 23 that surrounds the main tank body 21 circumferentially is required. The pressure-bearing rings 23 are arranged axially along the outer wall of the main tank body 21. A triangular pressure-bearing rib 24 is connected between adjacent pressure-bearing rings 23. A bearing plate 25 arranged in central symmetry is provided at the lower end of the main tank body 21. Pressure-bearing hoop rings 26 are fixed at the top and bottom and the junction of the middle part of the main tank body 21. When the internal and external pressure difference fluctuates, the conventional tank joints crack due to stress concentration, while the pressure-bearing hoop rings 26 in this application can effectively improve the local structural strength and prevent it from tearing and deforming.

[0024] Even further, the dispersion assembly 6 increases the outlet for the solvent to enter the flash chamber 2. Specifically, it includes a spray pipe 61 arranged inside the main tank body 21 and extending along the central axis. The upper end of the spray pipe 61 is communicated with the feeding assembly 1. An evaporation nozzle 62 is installed at the lower end of the spray pipe 61. The evaporation nozzle 62 has eight dispersion claws 63 arranged in central symmetry and extending outward. Spray holes facing upward are evenly distributed on the dispersion claws 63. The dispersion claws 63 on the evaporation nozzle 62 keep a sufficient distance from the bottom of the main tank body 21, without affecting the temporary storage and collection of the solution by the liquid phase collection assembly 3.

[0025] In addition, the internal vacuum level of existing purification devices relies on pump power regulation. During actual use, the pressure changes linearly, resulting in long transition times when increasing or decreasing the pressure, which affects the efficiency of solvent purification. The staged pressure-regulating assembly 7 in this embodiment, on the other hand, includes several integrated pressure-regulating tanks 71. These are cylindrical and each is connected to an oil-free vacuum pump with a different rated flow rate. The pressure-regulating tanks 71 are connected to the flash chamber 2 via a pressure-regulating pipe 72. A shutoff valve and a pressure sensor are installed between the pressure-regulating pipe 72 and the flash chamber 2. The pressure-regulating tanks 71 are internally mounted with a dynamic adjustment assembly 8. Multiple pressure-regulating tanks 71 are arranged in a matrix on the frame, and the internal dynamic adjustment assembly 8 simultaneously meets the pressure-regulating and pressure-reducing requirements.

[0026] At the same time, the dynamic adjustment component 8 adopts a multi-stage linkage, specifically including an adjusting screw 81 extending along the central axis of the pressure-regulating tank 71 and rotatably connected to the pressure-regulating tank 71, the adjusting screw 81 is transmission-connected to the adjusting motor 82, the adjusting screw 81 is threadedly connected to an adjusting disk 83, a limiting guide rail 84 is slidingly installed between the adjusting plate and the inner wall of the pressure-regulating tank 71, a sealing plate 85 is installed on the adjusting disk 83, which is pressed against the inner wall of the pressure-regulating tank 71, and the adjusting disk 83 divides the interior of the pressure-regulating tank 71 into a negative pressure chamber 86 and a positive pressure chamber 87. The negative pressure chamber 86 is connected to the flash chamber 2 through the pressure-regulating pipe 72 and the negative pressure chamber 86 is connected to the oil-free vacuum pump. The positive pressure chamber 87 is connected to the flash chamber 2 through the air inlet pipe 88, and the air inlet pipe 88 is installed with a shut-off valve and a pressure sensor. When the vacuum degree of the flash chamber 2 needs to be further increased, multiple pressure regulating tanks 71 are opened, and the negative pressure chamber 86 therein is pre-evacuated by an oil-free vacuum pump. After being opened, it is connected to the flash chamber 2 and the oil-free vacuum pump continues to work. During this process, the internal pressure of the flash chamber 2 shows an obvious step-by-step change.

[0027] When the vacuum level inside flash chamber 2 needs to be lowered, the positive-pressure chamber 87 of surge tank 71 opens and communicates with flash chamber 2. The air pre-stored in negative-pressure chamber 86 causes the vacuum level inside surge tank 71 to decrease in a stepwise manner. Multiple surge tanks 71 can be opened and closed alternately, thereby achieving short-term, continuous pressure changes inside flash chamber 2. Simultaneously, an axially adjustable adjustment dial 83 adjusts the volume ratio of negative-pressure chamber 86 and positive-pressure chamber 87. A built-in pressure sensor provides negative feedback on the vacuum level, ensuring rapid stabilization of the internal pressure after adjustment.

[0028] Visibly, most of the solvent vapor is led out by the liquid-phase collection component 3 in the flash chamber 2, and the volatile solvent components are led out by the gas-phase collection component 4. The liquid-phase collection component 3 includes a drain pipe 31 connected to the lower end of the flash chamber 2. The drain pipe 31 is communicated with the solvent tank 32 through a drain pump. A one-way valve and a stop valve are installed on the drain pipe 31. The gas-phase collection component 4 includes a gas collection tray 41 connected to the upper end of the flash chamber 2. The gas collection tray 41 is flat and several collection pipelines 42 are connected to the upper end. The collection pipelines 42 are equipped with temperature sensors, pressure sensors and flow meters. The collection pipelines 42 are connected to a condensation tank 43. The condensation component 5 is installed in the condensation tank 43. The condensation component 5 condenses and collects the volatile components, so as to achieve the purpose of solvent purification.

[0029] Obviously, the condensation component 5 can absorb heat by water cooling or air cooling. It includes a condensation pipe 51 coiled and arranged in the condensation tank 43. The condensation pipe 51 is a molecular sieve membrane tube. A porous support is arranged inside the condensation pipe 51 and a molecular sieve layer is arranged outside. The space between the condensation pipe 51 and the condensation tank 43 is separated into several independent separation chambers 53 by a partition plate 52. The separation chambers 53 are respectively connected with separation pipes 54 through oil-free vacuum pumps. The pore diameters of the molecular sieve layers of the condensation pipe 51 corresponding to the separation chambers 53 are different. Condensation fins 55 are arranged inside the separation chambers 53, and the condensation fins 55 are connected with heat dissipation copper pipes 56.

[0030] As Figure 7 shown, it is very difficult for various conventional methods to reach the purity level required for spinning. In this embodiment, a molecular sieve membrane tube is used to deeply purify the solvent. As a new type of inorganic separation membrane (5A molecular sieve, pore diameter about 0.5nm), the molecular sieve membrane can directionally separate certain components by designing different molecular sieve pore diameters. Utilizing the characteristic that the solvent molecules are relatively small, the molecular sieve pore diameter is designed to be slightly larger than the diameter of the solvent molecules, allowing the solvent molecules to pass through the molecular sieve, but those molecules larger than the solvent can be intercepted, so as to have the ability to directionally separate the solvent, and have the advantages of high flux, high stability, etc. It can efficiently separate the solvent and separate multiple components simultaneously; the separation of near-boiling mixtures and azeotropes is not limited by the vapor-liquid equilibrium and no extractant is required; the molecular sieve membrane can be activated by pickling, calcination and other methods.

[0031] A method for purifying flash solvents adopts the above-mentioned method and device for purifying flash solvents, and includes the following steps: S1: The feeding component 1 inputs the high-temperature and high-pressure solvent from the external storage tank into the flash chamber 2; S2: After the solvent enters the flash chamber 2, it is depressurized and flashed. Part of the steam directly solidifies and is collected and led out by the liquid-phase collection component 3, and the other part is input into the gas-phase collection component 4; S3: The dispersion component 6 introduces the solvent into the flash chamber 2 for flashing, and the stepwise pressure regulating component 7 performs stepwise regulation on the internal pressure of the flash chamber 2; S4: The condensation component 5 in the gas phase collection component 4 separates the steam, collects the separated condensed solvent and introduces it into an external storage tank, and the non-condensable solvent vapor is led out and processed centrally.

[0032] In summary, the principle of this embodiment is as follows: the solvent is delivered from a storage tank by a feed pump, heated, and pressurized. When the solvent enters the flash chamber 2, non-volatile substances, namely some heavy components, are largely separated by the liquid phase collection assembly 3. The solvent vapor, which has turned into a vapor, enters the condensation assembly 5 through the gas phase collection assembly 4. The extremely small amount of heavy components is separated by the condensation pipe 51 built into the condensation assembly 5, while the solvent simultaneously permeates through the molecular sieve membrane tube.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0034] Although this article uses more feed assembly 1, feed pipe 11, pressure relief pipe 12, buffer pipe 13, buffer tank 14, flash chamber 2, main tank body 21, support frame 22, pressure ring 23, pressure rib 24, pressure plate 25, pressure hoop 26, liquid phase collection assembly 3, drain pipe 31, solvent tank 32, gas phase collection assembly 4, gas collecting plate 41, collection pipeline 42, condensation tank 43, condensation assembly 5, condensation pipe 51, isolation plate 52, The terms separation chamber 53, separation tube 54, condensing fin 55, heat dissipation copper tube 56, dispersion assembly 6, spray tube 61, evaporation nozzle 62, dispersion claw 63, graded pressure regulating assembly 7, pressure regulating tank 71, pressure regulating tube 72, dynamic adjustment assembly 8, adjustment screw 81, adjustment motor 82, adjustment disk 83, limiting guide rail 84, sealing plate 85, negative pressure chamber 86, positive pressure chamber 87, and air inlet pipe 88 are used herein, but the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A purification device for flash evaporation solvent, comprising a feed component (1), wherein the feed component (1) is connected to a flash evaporation chamber (2), the flash evaporation chamber (2) is connected to a liquid phase collection component (3) and a gas phase collection component (4), and the gas phase collection component (4) is connected to a condensation component (5), characterized in that, The flash chamber (2) is internally provided with a dispersion component (6), and the flash chamber (2) is connected with a grading pressure regulating component (7) opposite to the dispersion component (6).

2. The purification device for a flash evaporation solvent according to claim 1, wherein, The feeding component (1) includes a feeding pipe (11) and a feeding pump. A pressure sensor and a flowmeter are installed on the feeding pipe (11), and a temperature sensor is installed at the junction of the feeding pipe (11) and the flash chamber (2).

3. The purification device for flash evaporation solvent according to claim 2, characterized in that, The feeding pipe (11) is connected with a pressure relief pipe (12) and a buffer pipe (13) through a distribution valve, and the buffer pipe (13) is connected with a buffer tank (14).

4. A purification device for flash evaporation solvent according to claim 1, characterized in that, The flash chamber (2) includes a main tank body (21), and the bottom of the main tank body (21) is spherical and funnel-shaped.

5. The purification device for a flash evaporation solvent according to claim 4, characterized in that, The main tank body (21) is provided with a support frame body (22) distributed circumferentially and extending to the bottom, and a pressure-bearing component is arranged between the support frame body (22) and the main tank body (21).

6. The purification device for a flash evaporation solvent according to claim 5, characterized in that, The pressure-bearing component includes a pressure-bearing ring (23) surrounding the main tank body (21) circumferentially. The pressure-bearing rings (23) are arranged axially along the outer wall of the main tank body (21), and triangular pressure-bearing ribs (24) are connected between adjacent pressure-bearing rings (23).

7. A purification device for flash evaporation solvent according to claim 6, characterized in that, The lower end of the main tank body (2) is provided with a bearing plate (25) arranged in central symmetry, and pressure-bearing hoop rings (26) are fixed at the top, bottom and middle junction of the main tank body (21).

8. A purification device for flash evaporation solvent according to claim 4, characterized in that, The dispersion component (6) includes a spray pipe (61) arranged inside the main tank body (21) and extending along the central axis. The upper end of the spray pipe (61) is communicated with the feeding component (1).

9. The purification device for a flash evaporation solvent according to claim 8, wherein, An evaporation nozzle (62) is installed at the lower end of the spray pipe (61). The evaporation nozzle (62) has eight dispersion claws (63) arranged in central symmetry and extending outwards. Spray holes facing upwards are uniformly distributed on the dispersion claws (63).

10. The purification device for a flash solvent according to claim 1, characterized in that, The grading pressure regulating component (7) includes a number of pressure regulating tanks (71) arranged integrally. The pressure regulating tanks (71) are cylindrical and are respectively connected with oil-free vacuum pumps with different rated flows.

11. A purification device for a flash solvent according to claim 10, characterized in that, The pressure regulating tank (71) is communicated with the flash chamber (2) through a pressure regulating pipe (72). A stop valve and a pressure sensor are installed between the pressure regulating pipe (72) and the flash chamber (2), and a dynamic regulating component (8) is installed inside the pressure regulating tank (71).

12. A purification device for flash solvents according to claim 11, characterized in that, The dynamic regulating component (8) includes an adjusting screw rod (81) extending along the central axis of the pressure regulating tank (71) and rotatably connected with the pressure regulating tank (71). The adjusting screw rod (81) is in transmission connection with an adjusting motor (82). The adjusting screw rod (81) is threadedly connected with an adjusting disc (83), and a limiting guide rail (84) is slidably installed between the adjusting plate and the inner wall of the pressure regulating tank (71).

13. A purification device for a flash solvent according to claim 12, characterized in that, A sealing piece (85) that presses against the inner wall of the pressure regulating tank (71) is installed on the regulating disk (83). The regulating disk (83) divides the interior of the pressure regulating tank (71) into a negative pressure chamber (86) and a positive pressure chamber (87). The negative pressure chamber (86) is communicated with the flash evaporation chamber (2) through a pressure regulating pipe (72), and the negative pressure chamber (86) is communicated with an oil-free vacuum pump. The positive pressure chamber (87) is communicated with the flash evaporation chamber (2) through an air inlet pipe (88). A stop valve and a pressure sensor are installed on the air inlet pipe (88).

14. A purification device for flash evaporation solvent according to claim 1, characterized in that, The liquid phase collection assembly (3) includes a drain pipe (31) connected to the lower end of the flash evaporation chamber (2). The drain pipe (31) is communicated with a solvent tank (32) through a drain pump. A check valve and a stop valve are installed on the drain pipe (31).

15. A purification device for a flash solvent according to claim 1, characterized in that, The gas phase collection assembly (4) includes a gas collection disk (41) connected to the upper end of the flash evaporation chamber (2). The gas collection disk (41) is flat and several collection pipelines (42) are connected to the upper end thereof.

16. A purification device for flash solvents according to claim 15, characterized in that, The collection pipeline (42) is equipped with a temperature sensor, a pressure sensor and a flow meter. The collection pipeline (42) is connected to a condensation tank (43). The condensation assembly (5) is installed in the condensation tank (43).

17. A purification device for flash evaporation solvent according to claim 16, wherein, The condensation assembly (5) includes a condensation pipe (51) coiled and arranged in the condensation tank (43). The condensation pipe (51) is a molecular sieve membrane tube. A porous support body is arranged inside the condensation pipe (51) and a molecular sieve layer is arranged outside.

18. A purification device for a flash solvent according to claim 17, characterized in that, A partition plate (52) divides the space between the condensation pipe (51) and the condensation tank (43) into several independent separation chambers (53).

19. The purification device for flash evaporation solvent according to claim 18, characterized in that, The separation chambers (53) are respectively connected with separation pipes (54) through an oil-free vacuum pump. The pore diameters of the molecular sieve layers of the condensation pipes (51) corresponding to the respective separation chambers (53) are different.

20. A purification device for a flash solvent according to claim 19, characterized in that, Condensation fins (55) are arranged inside the separation chambers (53). The condensation fins (55) are connected with heat dissipation copper pipes (56).

21. A method for purifying a flash solvent, which uses a purification device for a flash solvent according to any one of the above claims 1-20, characterized in that, Comprising the following steps: S1: The feeding assembly (1) inputs a high-temperature and high-pressure solvent from an external storage tank into the flash evaporation chamber (2); S2: After the solvent enters the flash evaporation chamber (2), it is depressurized and flash-evaporated. Part of the steam directly solidifies and is collected and led out by the liquid phase collection assembly (3), and the other part is input into the gas phase collection assembly (4); S3: The dispersion assembly (6) introduces the solvent into the flash evaporation chamber (2) for flash evaporation, and the stepwise pressure regulating assembly (7) performs stepwise regulation on the internal pressure of the flash evaporation chamber (2); S4: The condensation assembly (5) in the gas phase collection assembly (4) separates the steam. The separated and condensed solvent is collected and introduced into an external storage tank, and the non-condensable solvent steam is led out and centrally processed.

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