Organic solvent condensation recovery system for nitrogen blowing concentrator

Abstract

The invention relates to the technical field of nitrogen blowing instruments, in particular to an organic solvent condensation and recovery system for a nitrogen blowing instrument, which comprises a heating device and a receiving bin for heating a nitrogen blowing test tube; the nitrogen blowing device comprises a nitrogen conveying pipe and a nitrogen blowing part connected with the nitrogen conveying pipe, the nitrogen blowing part is connected with a plurality of nitrogen blowing pipes, nitrogen conveyed by the nitrogen conveying pipe is conveyed into the nitrogen blowing pipes by the nitrogen blowing part, the nitrogen blowing pipes carry out nitrogen blowing on the surface of the solvent in the nitrogen blowing test tube, the nitrogen blowing part is provided with a recovery cavity, and the recovery cavity is used for recovering gas on the surface of the solvent in the nitrogen blowing test tube to the condensation recovery device; the lifting assembly comprises a driving part and a connecting piece, the connecting piece is fixedly connected with the nitrogen blowing device, and the driving part is used for driving the nitrogen blowing device fixedly connected with the connecting piece to move up and down in the height direction of the nitrogen blowing device; and the collection vessel is used for collecting the organic solvent condensed by the condensation recovery device, so that the organic solvent is prevented from diffusing into the surrounding environment, the resource waste is reduced, and the risk of environmental pollution is reduced.

Description

Technical Field

[0001] This invention relates to the field of nitrogen blowing technology, specifically to an organic solvent condensation and recovery system for nitrogen blowing. Background Technology

[0002] In the field of food import and export testing, food matrices typically contain large amounts of water, fat, protein, and pigments, while target analytes, such as pesticide residues, veterinary drug residues, food additive migrations, and contaminants, often exist in trace amounts. During testing, conventional methods involve extracting the target analytes using organic solvents, which often results in the analytes being transferred to a large organic phase. To reduce the impact of the organic phase on subsequent testing, testing laboratories typically use nitrogen evaporation equipment as the most effective way to reduce solvent volume and increase analyte concentration without damaging the analytes.

[0003] However, in food testing, the organic solvents commonly used for extraction are mostly low- to medium-boiling-point, volatile systems, such as n-hexane, petroleum ether, dichloromethane, ethyl acetate, acetone, and acetonitrile. These solvents are preferentially and rapidly removed under nitrogen purging conditions. Traditional nitrogen purging apparatuses typically release these volatile organic solvents directly into the air. This method not only wastes a large amount of organic solvents and increases testing costs, but also poses a hazard to the experimental environment and the health of operators due to the evaporation into the air.

[0004] Therefore, how to effectively recover these organic solvents, reduce their harm to the environment and human health, and at the same time improve the recovery rate of the analytes and the accuracy of the test results has become an urgent problem to be solved in the field of food testing. Summary of the Invention

[0005] The purpose of this invention is to provide an organic solvent condensation and recovery system for a nitrogen blowing apparatus to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an organic solvent condensation and recovery system for a nitrogen blowing apparatus, comprising: The heating device includes a receiving chamber and a nitrogen blowing test tube assembled in the receiving chamber, wherein the receiving chamber is used to heat the nitrogen blowing test tube; The nitrogen blowing device includes a nitrogen supply pipe and a nitrogen blowing section connected to the nitrogen supply pipe. The nitrogen blowing section is connected to multiple nitrogen blowing pipes. The nitrogen blowing section feeds nitrogen gas from the nitrogen supply pipe into the nitrogen blowing pipes. The nitrogen blowing pipes blow nitrogen onto the surface of the solvent inside the nitrogen blowing test tube. The nitrogen blowing section is provided with a recovery chamber for recovering the gas on the surface of the solvent in the nitrogen blowing test tube to a condensation recovery device. The lifting assembly includes a drive unit and a connector. The connector is fixedly connected to the nitrogen blowing device, and the drive unit is used to drive the nitrogen blowing device, which is fixedly connected to the connector, to move up and down along the height direction of the nitrogen blowing device. A collection dish, used to collect organic solvents condensed by the condensation recovery device; The controller, electrically connected to the heating device and the drive unit, is used to control the temperature of the receiving chamber and the operating status of the drive unit.

[0007] The above technical solution produces the following technical effects: In the technical solution of this application, the receiving chamber of the heating device heats the nitrogen blowing test tube, which accelerates the evaporation of the organic solvent inside the test tube, providing a suitable temperature environment for the subsequent nitrogen blowing process and ensuring nitrogen blowing efficiency. The nitrogen blowing device transmits nitrogen gas to the nitrogen blowing section through a nitrogen delivery pipe, and then the nitrogen blowing pipe blows nitrogen onto the surface of the solvent inside the nitrogen blowing test tube, promoting faster evaporation of the organic solvent. The recovery chamber can promptly recover the evaporating gas to the condensation recovery device, preventing the organic solvent from dispersing into the surrounding environment, thus reducing resource waste and lowering the risk of environmental pollution.

[0008] As a further improvement to the organic solvent condensation and recovery system for a nitrogen blowing device of this application, the nitrogen blowing section has a built-in output chamber, and an output plate is provided at the bottom of the output chamber. The output plate is connected to one end of multiple nitrogen blowing pipes. The nitrogen delivery pipe introduces nitrogen gas into the output chamber, and the nitrogen gas is then output to the nitrogen blowing pipe through the output chamber. A recovery plate is provided at the top of the output chamber, and a recovery pipe is provided between the recovery plate and the output plate. The recovery pipe is used to output the gas at the bottom of the output plate to the top of the recovery plate. A recovery chamber is sealed at the top of the recovery plate, and the recovery chamber transmits the gas output from the recovery pipe to the condensation recovery device.

[0009] As a further improvement to the organic solvent condensation and recovery system for a nitrogen blower of this application, the recovery tube includes a first tube body and a second tube body, which are spaced apart, and one end of the nitrogen blower tube is located between the first tube body and the second tube body.

[0010] As a further improvement to the organic solvent condensation and recovery system for a nitrogen blower of this application, one end of the nitrogen blowing pipe in the assembly cavity is connected through the output plate, and the other end of the nitrogen blowing pipe extends into the assembly cavity, and an outer wall is provided around the assembly cavity. When the nitrogen blowing device is driven by the lifting assembly to move toward the receiving chamber, the bottom of the outer wall abuts against the receiving chamber. As a further improvement to the organic solvent condensation and recovery system for a nitrogen blowing device of this application, the bottom of the output plate is provided with multiple stepped grooves, and through holes are provided inside the stepped grooves for the nitrogen blowing pipe to pass through.

[0011] As a further improvement to the organic solvent condensation and recovery system for a nitrogen blowing apparatus of this application, the condensation and recovery device includes a condenser tube assembly and heat sinks covering the condenser tube assembly. The input end of the condenser assembly is connected to the recovery chamber through a conveying pipe, and the output end of the condenser assembly is used to discharge the condensed gas. The condenser assembly discharges the condensed organic solvent into a collection dish.

[0012] As a further improvement to the organic solvent condensation and recovery system for a nitrogen blower of this application, the condenser tube assembly includes multiple sets of reciprocating condenser tubes and a first reciprocating bend and a second reciprocating bend that are connected in communication with the condenser tubes. The condenser tubes are installed inside the heat sink. The first reciprocating bend connects to the top of two adjacent condenser tubes, and the second reciprocating bend connects to the bottom of two adjacent condenser tubes. The second reciprocating corner has an opening, which is oriented towards the collecting dish.

[0013] As a further improvement to the organic solvent condensation and recovery system for a nitrogen blowing device of this application, the receiving chamber is fixed with at least one set of uprights, the uprights passing through the nitrogen blowing device, and the nitrogen blowing device moving up and down along the uprights.

[0014] As a further improvement to the organic solvent condensation and recovery system for a nitrogen blowing device of this application, the lifting assembly includes a column and a drive unit disposed inside the column; The column is provided with a vertical groove. One end of the connector is connected to the drive unit through the vertical groove, and the other end of the connector is fixedly connected to the nitrogen blowing device.

[0015] As a further improvement to the organic solvent condensation and recovery system for a nitrogen blowing device of this application, the column is provided with a slide rail, the nitrogen blowing device is provided with a sliding component, the sliding component is provided with a groove, and the groove is assembled and connected with the slide rail. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the nitrogen blowing device of the present invention; Figure 3 This is a schematic diagram illustrating the working principle of the controller of the present invention; Figure 4 for Figure 2 A magnified view of the area at point B; Figure 5 This is a partial cross-sectional view of the nitrogen blowing device of the present invention; Figure 6 For the present invention Figure 5 Structural diagram; Figure 7 This is a perspective view of the nitrogen blowing device of the present invention; Figure 8 for Figure 2 A magnified view of the area at point C; Figure 9This is a side view of the nitrogen blowing device of the present invention; Figure 10 for Figure 9 Sectional view along AA; Figure 11 for Figure 10 A magnified view of the area at point D; Figure 12 This is a partial structural diagram of the nitrogen blowing device of the present invention; Figure 13 for Figure 12 A magnified view of the area at point E; Figure 14 This is a schematic diagram of a partial structure of the column; In the picture: Tag name: 1 - Heating device; 11 - Receiving Warehouse; 111 - Pole erection; 12 - Nitrogen blown test tubes; 2 - Nitrogen blowing device; 21 - Nitrogen delivery pipe; 22 - Nitrogen blowing section; 221 - Nitrogen blowing pipe; 222 - Recovery chamber; 223 - Output board; 2231 - Step groove; 2232 - Through hole; 224 - Output cavity; 225 - Recycling tube; 2251 - first tube body; 2252 - Second tube body; 226 - Recycling bin; 2261 - Delivery pipe; 227 - Assembly cavity; 2271 - outer wall; 228 - Recycling board; 23 - Slider; 231 - Groove; 3 - Condensation recovery unit; 31 - Condenser assembly; 311 - Condenser; 3111 - First reciprocating corner; 3112 - Second reciprocating corner; 3113 - Opening; 32 - Heatsink; 4 - Lifting assembly; 41 - Drive unit; 42 - Connector; 43 - Columns; 431 - Vertical groove; 432 - Slide rail; 5 - Collection dish; 6 - Controller. Detailed Implementation

[0017] Food matrices typically contain high levels of water, fat, protein, and pigments, while target analytes (such as pesticide residues, veterinary drug residues, food additive migrations, and contaminants) often exist in trace amounts. After organic solvent extraction, the analytes are transferred to a large organic phase. If directly injected, the concentration is often below the instrument's detection limit, and the solvent system may not be compatible with the subsequent GC-MS or LC-MS injection conditions. Therefore, sample pretreatment after extraction usually requires a step that reduces the solvent volume, increases the analyte concentration, and allows for solvent displacement without damaging the analytes. Nitrogen blowing concentration is a widely used technique in this process.

[0018] Among them, GC-MS and LC-MS are the core analytical instrument combinations in food import and export inspection. GC-MS, or Gas Chromatography-Mass Spectrometry, combines the high separation capability of gas chromatography with the high identification capability of mass spectrometry. The gas chromatography portion utilizes the differences in partition coefficients between the stationary and mobile phases to separate the components in complex mixtures. The mass spectrometry portion performs qualitative and quantitative analysis on the separated components, accurately determining the molecular weight and structural information of compounds by measuring the mass and relative abundance of ions. In food import and export inspection, GC-MS can be used to detect volatile and semi-volatile organic compounds, such as pesticide residues, flavor components, and solvent residues. It can detect these compounds with high sensitivity and selectivity, providing important assurance for food quality and safety.

[0019] LC-MS, or Liquid Chromatography-Mass Spectrometry, is suitable for analyzing compounds that are not easily volatile, thermally unstable, or large molecules. Liquid chromatography can be performed at room temperature and has good separation performance for polar and large molecular weight compounds. Mass spectrometry, as a detector, provides molecular weight and structural information of compounds, enabling accurate identification and quantification of target compounds. In the field of food testing, LC-MS is commonly used to detect food additives, veterinary drug residues, and biotoxins. It can detect some compounds that are difficult to analyze with GC-MS, expanding the scope and capability of detection.

[0020] The working principle of a nitrogen evaporator is essentially to continuously purge the surface of the extract in the nitrogen evaporation tube 12 with an inert gas (specifically nitrogen), constantly removing the saturated solvent vapor above the surface and keeping the solvent in a state conducive to evaporation. In practice, the nitrogen evaporator is usually used in conjunction with a heating device 1. The heating device 1 is used to heat the nitrogen evaporation tube 12 or via a water bath. This allows the nitrogen evaporation tube 12 to accelerate the escape rate of solvent molecules at a controlled temperature. Specifically, compared to natural evaporation or air purging, nitrogen does not participate in chemical reactions, significantly reducing the risk of oxidation, which is particularly important for easily oxidized pesticide residues, fat-soluble contaminants, and some functional additives commonly found in food testing.

[0021] In the process of treating the extract (the extract liquid of the sample solution, specifically the pre-experimental process, which will not be elaborated further in this application) in nitrogen blowing tube 12 using a nitrogen blower, the commonly used organic solvents for extraction are mostly low-to-medium boiling points and volatile systems, such as n-hexane, petroleum ether, dichloromethane, ethyl acetate, acetone, and acetonitrile. These solvents are preferentially and rapidly removed under nitrogen blowing conditions, which is the basis for the concentration step. However, conventional experimental apparatus does not consider that these volatile gases will not only waste the detection material but also affect the relatively enclosed laboratory air, thus causing irreversible damage to the health of the experimenters.

[0022] Therefore, this application is motivated by the need for the recovery and filtration of volatile organic solvent gases during the operation of a nitrogen evaporator. The organic solvent condensation and recovery system for a nitrogen evaporator described in this invention is designed specifically to address this problem, as it effectively condenses and recovers organic solvents during the nitrogen evaporation process, which is of great significance.

[0023] 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.

[0024] Example 1 like Figure 1-14As shown, to address the aforementioned technical deficiencies, this application improves upon existing nitrogen blowing apparatuses. Specifically, the organic solvent condensation and recovery system for the nitrogen blowing apparatus includes: a heating device 1, comprising a receiving chamber 11 and a nitrogen blowing test tube 12 assembled within the receiving chamber 11. The receiving chamber 11 is used to heat the nitrogen blowing test tube 12. In practice, the operator places the nitrogen blowing test tube 12 into the receiving hole in the receiving chamber 11. An electric heating module is located at the bottom of the receiving chamber 11, directly acting on the receiving chamber 11 to heat the nitrogen blowing test tube 12 within it; alternatively, the electric heating module heats the liquid in a water bath at the bottom of the receiving chamber 11, thereby transferring heat to the nitrogen blowing test tube 12 within the receiving chamber 11. A controller 6 is electrically connected to the heating device 1. The temperature of the receiving chamber 11 is directly controlled by the controller.

[0025] Furthermore, the nitrogen blowing device 2 includes a nitrogen delivery pipe 21 and a nitrogen blowing section 22 connected to the nitrogen delivery pipe 21. The nitrogen blowing section 22 is connected to multiple nitrogen blowing pipes 221. The nitrogen blowing section 22 delivers nitrogen gas from the nitrogen delivery pipe 21 into the nitrogen blowing pipes 221. The nitrogen blowing pipes 221 blow nitrogen onto the surface of the solvent inside the nitrogen blowing test tube 12. The nitrogen blowing section 22 is provided with a recovery chamber 222, which is used to recover the gas on the surface of the solvent in the nitrogen blowing test tube 12 to the condensation recovery device 3. The end of the nitrogen delivery pipe 21 furthest from the nitrogen blowing section 22 is connected to a nitrogen source. In specific implementation, the nitrogen delivery pipe 21 is directly connected to a high-pressure nitrogen cylinder. The high-pressure nitrogen cylinder contains industrial-grade or high-purity nitrogen gas, with a pressure typically in the tens of megapascals. The pressure is reduced to a usable value by a pressure reducing valve and then transmitted to the nitrogen blowing section 22. The nitrogen blowing unit 22 is equipped with a gas distribution manifold connected to the nitrogen supply pipe 21. One part of the gas distribution manifold is connected to the nitrogen supply pipe 21, while the other part is inserted into the nitrogen blowing unit 22. This allows the nitrogen gas transmitted by the nitrogen supply pipe 21 to be fed into the nitrogen blowing pipe 221.

[0026] Furthermore, the lifting assembly 4 includes a drive unit 41 and a connector 42. The connector 42 is fixedly connected to the nitrogen blowing device 2. The drive unit 41 drives the nitrogen blowing device 2, which is fixedly connected to the connector 42, to move up and down along its height direction. In practice, the experimenter directly drives the drive unit 41 according to the controller 6. The drive unit 41 is specifically a servo motor connected to a lead screw. The connector 42 is connected to the lead screw. By rotating the lead screw, the connector 42 moves linearly along the axis of the lead screw, thereby enabling the nitrogen blowing device 2, which is fixedly connected to the connector 42, to move up and down along its height direction. This design makes the height adjustment of the nitrogen blowing device 2 more precise and flexible. The experimenter can adjust the relative distance between the nitrogen blowing device 2 and the receiving chamber 11 or other experimental components according to actual experimental needs. The lead screw converts the rotational motion of the motor into stable linear motion. After the experiment, the experimenter can also quickly adjust the nitrogen blowing device 2 to its initial height or a suitable storage position through the controller 6, facilitating subsequent cleaning and maintenance.

[0027] Furthermore, the collecting dish 5 is placed below the condensation recovery device 3, and its opening size is adapted to the liquid outlet of the condensation recovery device 3 to ensure that it can completely collect the organic solvent dripping from the condensation recovery device 3. The collecting dish 5 is made of a corrosion-resistant material, such as glass or a specific plastic material, to prevent the organic solvent from corroding it.

[0028] Furthermore, the nitrogen blowing section 22 has a built-in output cavity 224, and an output plate 223 is provided at the bottom of the output cavity 224. The output plate 223 is connected to one end of multiple nitrogen blowing pipes 221; for example Figure 5 As shown, the output chamber 224 is a sealed cavity enclosed within the nitrogen blowing section 22. In the specific implementation, nitrogen gas is introduced into the output chamber 224 through a gas distribution manifold connected to the nitrogen delivery pipe 21. Due to the internal air pressure of the output chamber 224, nitrogen gas fills the interior of the output chamber 224 and is discharged from the output chamber 224 through the nitrogen delivery pipe 21, which is connected to the output plate 223. Furthermore, the nitrogen gas can be transported along the nitrogen blowing pipe 221 to the surface of the extract in the nitrogen blowing test tube 12 for nitrogen blowing. It is worth noting that a recovery plate 228 is also provided at the top of the output chamber 224. A recovery pipe 225 is provided between the recovery plate 228 and the output plate 223. The recovery pipe 225 is used to output the gas at the bottom of the output plate 223 to the top of the recovery plate 228. A recovery chamber 226 is sealed at the top of the recovery plate 228. The recovery chamber 226 transmits the gas output from the recovery pipe 225 to the condensation recovery device 3. Therefore, the organic solvent vapor carried out during the nitrogen blowing process can enter the recovery chamber 226 along with the gas through the recovery pipe 225, and then be transported to the condensation recovery device 3 for recovery treatment, which effectively reduces the volatilization loss of organic solvents and reduces the pollution to the experimental environment.

[0029] Furthermore, such as Figure 4 and Figure 5 As shown, the recovery pipe 225 includes a first pipe body 2251 and a second pipe body 2252, which are spaced apart. One end of the nitrogen blowing pipe 221 is located between the first pipe body 2251 and the second pipe body 2252. Specifically, both the first pipe body 2251 and the second pipe body 2252 are designed with a semi-circular outer periphery cavity, and a cylindrical cavity is formed between them. One end of the nitrogen blowing pipe 221 is located inside this cavity. In the specific implementation process, when nitrogen gas is in the output chamber 224, the nitrogen gas can be forced through the gap between the first pipe body 2251 and the second pipe body 2252 into the cylindrical cavity under the action of gas pressure, and then forced into the nitrogen blowing pipe 221.

[0030] In summary, the above-mentioned technical solution of this application achieves efficient condensation and recovery of organic solvents by a nitrogen blower through the coordinated work of various components, which not only improves resource utilization but also reduces environmental pollution, and has good practicality and promotion value.

[0031] Example 2 Unlike Example 1, to further demonstrate the condensation and recovery method of the volatile organic solvent gas in this application, the condensation recovery device 3 of this application further includes a condenser tube assembly 31 and heat sinks 32 covering the condenser tube assembly 31.

[0032] Specifically, this application considers that during the nitrogen blowing process in a nitrogen gas analyzer, a mixed gas escapes from the nitrogen extraction liquid. The majority of this mixed gas is nitrogen (N2), with a small amount of organic solvent vapors (such as hexane, ethyl acetate, dichloromethane, etc.). The working principle of the condensation device in this application is to lower the temperature below the saturated vapor pressure of a substance, causing it to change from a gaseous state back to a liquid state. For example, nitrogen's boiling point at atmospheric pressure is approximately -196°C. This means that nitrogen can only liquefy under extremely low temperatures, close to liquid nitrogen conditions. Condensation methods seen in laboratories—such as cold water, ice water, and -20°C refrigeration circulators—are equivalent to high temperatures for nitrogen, and it will not condense at all. Furthermore, the technical solution of this application can release the mixed gas, after the removal of volatile organic solvents, into the air without affecting air quality.

[0033] The principle behind removing volatile organic solvents is based on the fact that the boiling points of common organic solvents are: n-Hexane: Boiling point approximately 69 °C; Ethyl acetate: approximately 77 °C; Dichloromethane: Approximately 40 °C; Acetone: Approximately 56 °C; The reason these solvents evaporate under nitrogen blowing conditions is that their vapor pressure is already very high at room temperature or with slight heating. By setting up a sufficiently low-temperature condensation zone at the exhaust end, these organic vapors can be reliquefied, while nitrogen continues to flow away as a "carrier gas".

[0034] Furthermore, the input end of the condenser assembly 31 is connected to the recovery chamber 226 through the delivery pipe 2261, and the output end of the condenser assembly 31 is used to discharge the condensed gas; furthermore, the condenser assembly 31 discharges the condensed organic solvent into the collection dish 5.

[0035] In specific implementation, the condenser tube assembly 31 includes multiple sets of reciprocating condenser tubes 311 and a first reciprocating bend 3111 and a second reciprocating bend 3112 that are connected to the condenser tubes 311. The condenser tubes 311 are housed within the heat sink 32. Structurally, the multiple reciprocating condenser tubes 311 are entirely embedded within the heat sink 32 or cooling block. The straight sections of the condenser tubes 311 are covered by the heat sink 32, with only the reciprocating bends exposed between the heat sink 32 or outside the cooling channel. The heat sink 32 maintains a low-temperature environment (relative to the boiling point of the organic solvent) for the condenser tubes 311 by using an external cold source (such as air cooling, water cooling, or a refrigeration module) or simply by increasing the heat dissipation area using conventional heat sinks 32. This keeps the walls of the condenser tubes 311 below the temperature corresponding to the saturated vapor pressure of the organic solvent. When the mixed gas flows through the inner wall of the condenser tube 311, the organic solvent vapor in it comes into contact with the low-temperature tube wall, undergoing a gas-liquid phase change and forming a liquid film or droplets on the tube wall surface.

[0036] Furthermore, regarding the aforementioned corners, the first reciprocating corner 3111 connects to the top of two adjacent condenser tubes 311, and the second reciprocating corner 3112 connects to the bottom of two adjacent condenser tubes 311. Because the condenser tubes 311 employ a reciprocating structure, each corner naturally forms a local low point. The condensed liquid solvent, under gravity, collects downwards along the tube wall and preferentially accumulates at the bottom corner of each reciprocating tube. To achieve effective recovery, an independent liquid opening 3113 is provided at the bottom corner of each reciprocating condenser tube 311. Specifically, the second reciprocating corner 3112 has an opening 3113, which faces the collection dish 5. This opening 3113 communicates with an external solvent collection channel or recovery container. The purpose of this design is to prevent condensate from accumulating inside the tubes or being re-entrained by high-speed airflow, while ensuring that the condensate in multiple condenser tubes 311 can be discharged synchronously and continuously.

[0037] Therefore, in actual operation, the mixed gas flows back and forth from top to bottom and then from bottom to top within the condenser tube 311. The solvent vapor in the gas is continuously condensed and discharged through the bottom outlets. The uncondensed nitrogen gas is discharged from the exhaust end of the device after completing the entire reciprocating heat exchange path. Since nitrogen gas has an extremely low boiling point, it remains in a gaseous state within the condensation temperature range and will not liquefy within the condenser tube 311, nor will it affect the separation and recovery of the solvent.

[0038] Other aspects that are the same as in Example 1 will not be repeated in this example.

[0039] Example 3 Unlike Embodiment 1, in this embodiment, it is important to note that one end of the nitrogen blowing pipe 221 in the assembly cavity 227 is connected to the output plate 223, and the other end of the nitrogen blowing pipe 221 extends into the assembly cavity 227. An outer wall 2271 is provided around the assembly cavity 227. When the nitrogen blowing device 2 is driven by the lifting assembly 4 to move towards the receiving chamber 11, the bottom of the outer wall 2271 abuts against the receiving chamber 11. Thus, the assembly cavity 227 formed by the outer wall 2271 forms another cavity. Within this cavity, the mixed gas can be continuously transferred to the recovery chamber 226 through the recovery pipe 225, and the recovery chamber 226 continuously condenses the mixed gas.

[0040] Furthermore, the bottom of the output plate 223 is provided with multiple stepped grooves 2231, and through holes 2232 are provided inside the stepped grooves 2231 for the nitrogen blowing pipe 221 to pass through. In specific implementation, the stepped grooves 2231 can be interference-fitted with the rubber sleeve at the top of the nitrogen blowing test tube 12. This allows for a tight connection between the nitrogen blowing pipe 221 and the nitrogen blowing test tube 12, preventing leakage of the mixed gas and ensuring the sealing and stability of the condensation recovery system. Moreover, this interference fit design can also play a buffering role to a certain extent, reducing the impact force on the nitrogen blowing test tube 12 during nitrogen blowing and protecting the nitrogen blowing test tube 12 from damage.

[0041] Furthermore, regardless of whether the connection is interference fit or not, the stepped groove 2231 can further ensure that the outer periphery of the through hole 2232 covers the opening 3113 of the recovery pipe 225, thereby further improving the recovery efficiency of the recovery pipe 225 for the mixed gas.

[0042] Furthermore, the receiving chamber 11 is fixed with at least one set of uprights 111, the uprights 111 passing through the nitrogen blowing device 2, and the nitrogen blowing device 2 moving up and down along the uprights 111. Figure 7As shown, two sets of uprights 111 are fixed around the receiving chamber 11 of this application. During implementation, the operator can flexibly adjust the height of the nitrogen blowing device 2 according to actual needs. The through-type uprights 111 provide a stable track for the nitrogen blowing device 2, ensuring its smooth vertical movement and preventing swaying or deviation. When operating on nitrogen blowing tubes 12 at different heights, the nitrogen blowing device 2 can be easily moved along the uprights 111 to quickly and accurately reach the appropriate position.

[0043] Preferably, the lifting assembly 4 includes a column 43, with a drive unit 41 disposed within the column 43. The column 43 has a vertical groove 431, and one end of the connector 42 is connected to the drive unit 41 through the vertical groove 431, while the other end of the connector 42 is fixedly connected to the nitrogen blowing device 2. In specific implementation, the drive unit 41 can be a combination of a motor and a lead screw and nut pair. After the motor starts, it drives the lead screw to rotate, and the nut on the lead screw will move linearly along the lead screw. The nut is fixed to the connector 42, thereby enabling the connector 42 to move along the vertical groove 431. Since the other end of the connector 42 is fixedly connected to the nitrogen blowing device 2, this drives the nitrogen blowing device 2 to perform a smooth lifting operation. This design of the lifting assembly 4 makes the height adjustment of the nitrogen blowing device 2 more precise and automated. The operator only needs to control the drive unit 41 to quickly and accurately adjust the nitrogen blowing device 2 to the ideal working height according to different experimental requirements.

[0044] Furthermore, the column 43 is provided with a slide rail 432, and the nitrogen blowing device 2 is provided with a sliding member 23. The sliding member 23 is provided with a groove 231, and the groove 231 is assembled and connected with the slide rail 432.

[0045] Other aspects that are the same as in Example 1 will not be repeated in this example.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An organic solvent condensation and recovery system for a nitrogen blowing apparatus, characterized in that, include: The heating device (1) includes a receiving chamber (11) and a nitrogen blowing test tube (12) assembled in the receiving chamber (11), wherein the receiving chamber (11) is used to heat the nitrogen blowing test tube (12); The nitrogen blowing device (2) includes a nitrogen supply pipe (21) and a nitrogen blowing section (22) connected to the nitrogen supply pipe (21). The nitrogen blowing section (22) is connected to a plurality of nitrogen blowing pipes (221). The nitrogen blowing section (22) feeds the nitrogen gas transmitted by the nitrogen supply pipe (21) into the nitrogen blowing pipe (221). The nitrogen blowing pipe (221) blows nitrogen onto the surface of the solvent in the nitrogen blowing test tube (12). The nitrogen blowing section (22) is provided with a recovery chamber (222). The recovery chamber (222) is used to recover the gas on the surface of the solvent in the nitrogen blowing test tube (12) to the condensation recovery device (3). The lifting assembly (4) includes a drive unit (41) and a connector (42). The connector (42) is fixedly connected to the nitrogen blowing device (2). The drive unit (41) is used to drive the nitrogen blowing device (2) fixedly connected to the connector (42) to move up and down along the height direction of the nitrogen blowing device (2). A collecting dish (5) is used to collect the organic solvent condensed by the condensation recovery device (3); The controller (6) is electrically connected to the heating device (1) and the drive unit (41) and is used to control the temperature of the receiving chamber (11) and the working state of the drive unit (41).

2. The organic solvent condensation and recovery system for a nitrogen blowing apparatus according to claim 1, characterized in that, The nitrogen blowing section (22) has an output chamber (224) inside, and an output plate (223) is provided at the bottom of the output chamber (224). The output plate (223) is connected through one end of the plurality of nitrogen blowing pipes (221). The nitrogen supply pipe (21) inputs nitrogen into the output chamber (224) and outputs nitrogen to the nitrogen blowing pipe (221) through the output chamber (224). The top of the output chamber (224) is provided with a recovery plate (228), and a recovery pipe (225) is provided between the recovery plate (228) and the output plate (223). The recovery pipe (225) is used to output the gas at the bottom of the output plate (223) to the top of the recovery plate (228). The top of the recovery plate (228) is sealed with a recovery chamber (226), and the recovery chamber (226) transmits the gas output by the recovery pipe (225) to the condensation recovery device (3).

3. The organic solvent condensation and recovery system for a nitrogen blowing apparatus according to claim 2, characterized in that, The recovery pipe (225) includes a first pipe body (2251) and a second pipe body (2252), the first pipe body (2251) and the second pipe body (2252) are spaced apart, and one end of the nitrogen blowing pipe (221) is located between the first pipe body (2251) and the second pipe body (2252).

4. The organic solvent condensation and recovery system for a nitrogen blowing apparatus according to claim 2, characterized in that, The nitrogen blowing section (22) is provided with an assembly cavity (227). The assembly cavity (227) allows one end of the nitrogen blowing pipe (221) to be connected through to the output plate (223). The other end of the nitrogen blowing pipe (221) extends into the assembly cavity (227). The assembly cavity (227) is provided with an outer wall (2271) around its perimeter. When the nitrogen blowing device (2) is driven by the lifting assembly (4) to move toward the receiving chamber (11), the bottom of the outer wall (2271) abuts against the receiving chamber (11).

5. An organic solvent condensation and recovery system for a nitrogen blowing apparatus according to claim 2, characterized in that, The bottom of the output plate (223) is provided with multiple stepped grooves (2231), and through holes (2232) are provided inside the stepped grooves (2231) for the nitrogen blowing pipe (221) to pass through.

6. The organic solvent condensation and recovery system for a nitrogen blowing apparatus according to claim 2, characterized in that, The condensation recovery device (3) includes a condenser tube assembly (31) and a heat sink (32) covering the condenser tube assembly (31). The input end of the condenser tube assembly (31) is connected to the recovery chamber (226) through the conveying pipe (2261), and the output end of the condenser tube assembly (31) is used to discharge the condensed gas. The condenser assembly (31) discharges the condensed organic solvent into the collection dish (5).

7. An organic solvent condensation and recovery system for a nitrogen blowing apparatus according to claim 6, characterized in that, The condenser assembly (31) includes multiple sets of reciprocating condensers (311) and a first reciprocating bend (3111) and a second reciprocating bend (3112) that are connected to the condensers (311). The condenser tube (311) is disposed inside the heat sink (32), the first reciprocating bend (3111) is connected to the top of two adjacent condenser tubes (311), and the second reciprocating bend (3112) is connected to the bottom of two adjacent condenser tubes (311); The second reciprocating corner (3112) is provided with an opening (3113), which is oriented toward the collecting dish (5).

8. An organic solvent condensation and recovery system for a nitrogen blowing apparatus according to claim 1, characterized in that, The receiving chamber (11) is fixed with at least one set of uprights (111), the uprights (111) are installed through the nitrogen blowing device (2), and the nitrogen blowing device (2) moves up and down along the uprights (111).

9. An organic solvent condensation and recovery system for a nitrogen blowing apparatus according to claim 1, characterized in that, The lifting assembly (4) includes a column (43), and the driving part (41) is disposed inside the column (43); The column (43) is provided with a vertical groove (431). One end of the connector (42) is connected to the drive unit (41) through the vertical groove (431), and the other end of the connector (42) is fixedly connected to the nitrogen blowing device (2).

10. An organic solvent condensation and recovery system for a nitrogen blowing apparatus according to claim 9, characterized in that, The column (43) is provided with a slide rail (432), the nitrogen blowing device (2) is provided with a sliding member (23), the sliding member (23) is provided with a groove (231), and the groove (231) is assembled and connected to the slide rail (432).

Images