Automatic proportioning system for extracting solvent

Abstract

The invention discloses an automatic proportioning system for extracting a solvent, which comprises a cavity provided with a solvent inlet, a solvent outlet and a separation port, the cavity is used for extracting a target substance by a solvent method, the total capacity is fixed when the target value is extracted, and both the solvent inlet and the separation port are provided with valves for controlling opening and closing states; the output end of the solvent adding device is connected with the solvent inlet; the reflux pipeline is provided with a first pump and a three-way regulating valve, two ends of the reflux pipeline are respectively connected with the solvent outlet and the solvent inlet, and a second output port of the three-way regulating valve is connected with at least one storage container; the detector is used for detecting the actual concentration of the mixed solvent; the controller is respectively connected with the detector, the valve, the first pump and the three-way regulating valve, and the controller is used for calculating the reflux dosage of the mixed solvent and the supplement amount of the extraction solvent with the standard concentration according to the actual concentration, the total capacity of the cavity and the concentration lower limit value of the extraction target substance; and the storage container is used for storing the excessive mixed solvent after reflux.

Description

Technical Field

[0001] The present invention relates to the technical field of extraction solvents, and particularly relates to an automatic proportioning system for extraction solvents. Background Art

[0002] In the process of extracting target substances by the solvent method, the solvent concentration is a key factor affecting the extraction efficiency and product quality. The traditional technology mainly uses the following two methods for solvent proportioning: operators manually calculate the required amount of solvent according to experience and weigh and mix it through measuring tools (such as graduated cylinders and balances). Some existing technologies use semi-automatic equipment for solvent proportioning. For example, the solvent addition amount is monitored through a flow controller and a sensor, but parameter adjustment still requires manual intervention.

[0003] Manual proportioning depends on the experience and skills of operators, and it is easy to cause inaccurate proportioning due to human errors, affecting the extraction effect. Although the semi-automatic system can improve the accuracy, it cannot be adjusted in real time according to the actual concentration, and it is prone to deviation during long-term operation or when the solvent properties change; the manual proportioning process is cumbersome, requiring multiple measurements and adjustments, which is time-consuming and laborious and cannot meet the needs of large-scale production. Although the semi-automatic system reduces manual operation, it still requires manual monitoring and intervention, with insufficient automation, and the existing technology usually uses a one-time use of solvents and does not make full use of the remaining mixed solvents. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic proportioning system for extraction solvents to solve the technical problems in the prior art, such as the need for manual measurement and determination in the proportioning of solvents for existing extraction solutions and the underutilization of mixed solvents.

[0005] To solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] An automatic proportioning system for extraction solvents, comprising:

[0007] A cavity, which is used for solvent extraction of target substances and has a fixed total volume when the extraction target value is reached. One end is provided with a solvent inlet for delivering extraction solvents into the cavity, and the other end is provided with a solvent outlet for discharging the remaining mixed solvents after extraction. A separation port for discharging the extracted target substances is also provided on the cavity. Both the solvent inlet and the separation port are provided with valves for controlling the opening and closing states;

[0008] A solvent addition device, the output end of which is connected to the solvent inlet, and the solvent addition device is used to provide extraction solvents with a standard concentration;

[0009] A reflux pipeline, with one end connected to the solvent discharge port and the other end connected to the solvent inlet. A first pump and a three-way regulating valve are sequentially arranged on the reflux pipeline. The first pump is used to provide power for the reflux of the mixed solvent to the cavity, and the second outlet of the three-way regulating valve is connected to at least one storage container;

[0010] A detector, arranged in the cavity, is used to detect the actual concentration of the mixed solvent;

[0011] A controller, respectively connected to the detector, the valve, the first pump and the three-way regulating valve. The controller is used to calculate the dosage of the reflux of the mixed solvent and the supplementary amount of the extraction solvent with a standard concentration according to the actual concentration, the total capacity of the cavity, and the lower limit value of the concentration of the target substance to be extracted;

[0012] Wherein, the storage container is used to store the excess mixed solvent after reflux.

[0013] As a preferred solution of the present invention, the cavity includes a connected mixing chamber and an extraction chamber. The solvent inlet is arranged on the mixing chamber, the outlet end of the reflux pipeline is connected to the solvent inlet on the mixing chamber, and a mixer is arranged in the mixing chamber.

[0014] As a preferred solution of the present invention, the storage container is connected to the mixing chamber through a pipeline a, and a second pump and a control valve are arranged on the pipeline a. The second pump is used to pump the solvent in the storage container to the mixing chamber;

[0015] And both the second pump and the second control valve are connected to the controller.

[0016] As a preferred solution of the present invention, there are 3 storage containers. The second outlet of the three-way regulating valve is respectively connected to each storage container through a shunt pipeline, and a first control valve is arranged on each shunt pipeline;

[0017] The first control valve is connected to the controller;

[0018] Each storage container is respectively used to store mixed solvents with different concentrations.

[0019] As a preferred solution of the present invention, it further includes a waste liquid container for collecting the waste mixed solvent during the extraction process.

[0020] As a preferred solution of the present invention, the detector includes an optical concentration sensor or a conductivity sensing probe.

[0021] This embodiment provides an automatic proportioning method for realizing the automatic proportioning system of the extraction solvent, including the following steps:

[0022] Step 100: Add the extract to be processed into the cavity, add the extraction solvent with a standard concentration through the solvent addition device, and set the lower limit value of the concentration of the extraction solvent used to extract the target substance in the cavity, that is, the concentration of the extraction solvent in the solvent extraction condition must be greater than the lower limit value;

[0023] Step 200: After the extraction is completed, discharge the upper-layer target extract through the separation port and then close the separation port;

[0024] Step 300: Obtain the actual concentration of the remaining mixed solvent after the extraction is completed through the detector, and transmit the actual concentration data to the controller, and the controller compares the relationship between the actual concentration and the lower limit value of the concentration of the target substance to be extracted;

[0025] Step 400: If the actual concentration is higher than the lower limit value, the controller calculates the supplementary amount of the extraction solvent with the standard concentration according to the total volume and supplements it into the cavity. At the same time, open the three-way regulating valve so that all the mixed solvent flows back to the cavity to mix and obtain a new extraction solvent;

[0026] If the actual concentration is lower than the lower limit value, the controller calculates the supplementary amount of the extraction solvent with the standard concentration and the dosage of the mixed solvent according to the principle that the total volume remains unchanged and the solvent extraction condition, and pumps them into the cavity;

[0027] If the amount of the mixed solvent exceeds the dosage, the excess mixed solvent is sent into the storage container;

[0028] Step 500: Continue to add the extract to be processed into the cavity, and cycle in turn.

[0029] As a preferred solution of the present invention, an upper limit value of the supplementary amount of the extraction solvent with the standard concentration is also set in the controller, and the reflux of the mixed solvent must satisfy that the supplementary amount is lower than the upper limit value;

[0030] When the supplementary amount exceeds the upper limit value, directly pump all the mixed solvent into the storage container, and add all the extraction solvent with the standard concentration into the cavity.

[0031] As a preferred solution of the present invention, the concentration and volume of the mixed solvent in each storage container are stored in the controller;

[0032] When the mixed solvent to be refluxed in the cavity cannot meet the reflux condition, while some or all of the combinations in one or more storage containers can meet the reflux condition, then pump the mixed containers that cannot meet the reflux condition into a waste liquid container connected to the second output port of the three-way regulating valve, and pump the mixed solvent in the storage container into the cavity.

[0033] The present invention has the following beneficial effects compared with the prior art:

[0034] Through real-time concentration detection and closed-loop control algorithms, the present invention automatically adjusts the ratio of the mixed solvent to the standard solvent to ensure the stability and accuracy of the solvent concentration during the extraction process. Through solvent reflux and recycling, solvent waste is minimized, and the solvent ratio is dynamically adjusted according to the characteristics of the target substance and the extraction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and those of ordinary skill in the art can also obtain other implementation drawings according to the provided drawings without creative efforts.

[0036] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present invention with multiple storage containers.

[0038] The reference numerals in the drawings are respectively represented as follows:

[0039] 1 - Cavity; 2 - Solvent inlet; 3 - Solvent outlet; 4 - Separation port; 5 - Solvent addition device; 6 - Reflux pipeline; 7 - First pump; 8 - Three-way regulating valve; 9 - Second output port; 10 - Storage container; 11 - Detector; 12 - Controller; 13 - Shunt pipeline; 101 - Mixing chamber; 102 - Extraction chamber; 103 - Pipeline a; 104 - Second pump; 105 - Control valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0041] As Figure 1 and Figure 2 shown, the present invention provides an automatic proportioning system for extraction solvents, including:

[0042] The cavity 1 has a fixed total capacity for solvent extraction of the target substance when the extraction target value is reached. One end is provided with a solvent inlet 2 for delivering the extraction solvent into the cavity 1, and the other end is provided with a solvent outlet 3 for discharging the remaining mixed solvent after the extraction is completed. A separation port 4 for discharging the extracted target substance is also provided on the cavity 1. The solvent inlet 2 and the like are all equipped with valves for controlling the opening and closing states;

[0043] The solvent adding device 5 has its output end connected to the solvent inlet 2. The solvent adding device 5 is used to provide the extraction solvent with a standard concentration;

[0044] The reflux pipeline 6 has one end connected to the solvent outlet 3 and the other end connected to the solvent inlet 2. A first pump 7 and a three-way regulating valve 8 are sequentially arranged on the reflux pipeline 6. The first pump 7 is used to provide power for the reflux of the mixed solvent back to the cavity 1. The second output port 9 of the three-way regulating valve 8 is connected to at least one storage container 10;

[0045] The detector 11 is arranged inside the cavity 1 and is used to detect the actual concentration of the mixed solvent;

[0046] The controller 12 is respectively connected to the detector 11, the valves, the first pump 7 and the three-way regulating valve 8. The controller 12 is used to calculate the usage amount of the mixed solvent for reflux and the supplementary amount of the extraction solvent with a standard concentration according to the actual concentration, the total capacity of the cavity 1, and the lower limit value of the concentration of the extracted target substance;

[0047] Among them, the storage container 10 is used to store the excess mixed solvent after reflux.

[0048] The mixed solvent refers to the remaining solvent whose concentration has decreased after extraction and even contains a small amount of impurities. It can still be reused for the same extract.

[0049] In this embodiment, the first goal to be achieved is: on the premise of meeting the solvent extraction conditions, the mixed solvent after each extraction is reused for the next extraction as much as possible, so as to save the usage amount of the extraction solvent with a standard concentration as much as possible.

[0050] For this, mainly by detecting the actual concentration of the mixed solvent after each extraction, and on the premise that the total capacity for secondary use remains unchanged, and the concentration of the extraction solvent obtained by secondary mixing is not lower than the lower limit value, calculate how much standard concentration extraction solvent needs to be supplemented for each mixed solvent, or how much mixed solvent and how much standard concentration extraction solvent need to be selected for mixing.

[0051] Since the total capacity is fixed, the concentrations of the two solvents are known, and the lowest concentration of the mixed solvent is known, it is easy to calculate the supplementary amount based on the relationship of the binary linear equation system.

[0052] Since the concentration of the mixed solvent after extraction will necessarily decrease and the total amount will necessarily decrease, there are two cases:

[0053] The first case is that the concentration of the mixed solvent is higher than the lower limit value. Then, no matter how much extraction solvent with a standard concentration is added, the condition of the lower limit value is satisfied. Generally, it is preferred to use all the mixed solvent.

[0054] In the second case, the concentration of the mixed solvent is lower than the lower limit value, and by adding extraction solvent with a standard concentration, the final solvent can be made higher than the lower limit value, and it can also be used. However, in this case, there is a concentration skew of the mixed solvent, and the volume (capacity) is not low, so more extraction solvent with a standard concentration is required. There may be a situation where all the mixed solvent can be used. In this case, the specific usage amount and replenishment amount can be calculated, and the excess can be drained into the storage container.

[0055] In this embodiment, the storage container can be used as a waste liquid container, and the excess or mixed solvent that does not meet the conditions for secondary use is directly drained into the storage container, and the number can be 1.

[0056] In this embodiment, in order to accurately control the usage amounts of the mixed solvent and the extraction solvent, the valve and pump structures can be flow valves, flow pumps, or a device for measuring flow rate can be added.

[0057] Furthermore, in order to ensure that the solvent for secondary use is mixed evenly, a mixing device can be added before the solvent enters the cavity. The following provides a preferred embodiment, that is, the cavity is divided into a connected mixing cavity 101 and an extraction cavity 102. The solvent inlet 2 is arranged on the mixing cavity 101, and the outlet end of the return pipeline 6 is connected to the solvent inlet 2 on the mixing cavity 101, and a mixer is arranged in the mixing cavity 101.

[0058] The mixer can be any component that can achieve the function of mixing and stirring.

[0059] Since the mixed solvent in the storage container 10 may be a mixed solvent with a concentration that meets the conditions for secondary use but with a usage amount exceeding the demand, therefore, in another embodiment, the storage container can also be used as the temporary storage and supply end of the mixing container. Specifically:

[0060] The storage container 10 is connected to the mixing cavity 101 through a pipeline a103, and a second pump 104 and a control valve 105 are arranged on the pipeline a103. The second pump 104 is used to pump the solvent in the storage container 10 to the mixing cavity 101;

[0061] And both the second pump 104 and the second control valve 105 are connected to the controller 12.

[0062] In this embodiment, when the mixed solvent during the extraction process fails to meet the conditions for secondary use, it is discharged into its hollow storage container, and the mixed solvent in the storage container that meets the conditions is pumped into the cavity. The specific implementation method and calculation refer to the method section later.

[0063] Preferably, according to the actual application, 3 storage containers 10 are preferably provided. The second output ports 9 of the three-way regulating valve 8 are respectively connected to each storage container 10 through a shunt pipeline 13, and a first control valve 105 is provided on each shunt pipeline 13;

[0064] The first control valve 105 is connected to the controller 12;

[0065] Each storage container 10 is respectively used to store mixed solvents with different concentrations, so that the solvent concentration and capacity of each storage container can be stored in the controller, ensuring the dosage calculation for secondary use, because during each secondary use and storage process of the mixed solvent, its data can be obtained through calculation or flow valves and pumps.

[0066] Of course, a device for detecting the capacity can also be added to the storage container, such as a liquid level detector, to obtain the capacity based on the size of the container.

[0067] Similarly, a device for detecting the capacity can also be provided in the cavity to obtain the amount of the remaining mixed solvent.

[0068] In addition, a waste liquid container can also be included to collect the waste mixed solvent during the extraction process. The waste liquid container is separately connected to the second output port 9 of the three-way regulating valve 8 through a shunt pipeline 13. Similarly, a second pump 104 and a control valve 105 are also provided on the shunt pipeline 13.

[0069] In this embodiment, the detector 11 includes an optical concentration sensor or a conductivity sensing probe. The valves are all solenoid valves.

[0070] According to the above automatic proportioning system, the specific method embodiment during the application of the proportioning system is as follows:

[0071] Step 100: Add the substance to be extracted into the cavity, add the extraction solvent with a standard concentration through the solvent adding device, and set the lower limit value of the concentration of the extraction solvent sent into the cavity for extracting the target substance, that is, the concentration of the extraction solvent in the solvent extraction condition must be greater than the lower limit value;

[0072] Step 200: After the extraction is completed, discharge the upper layer of the target extract through the separation port and then close the separation port;

[0073] Step 300: Obtain the actual concentration of the remaining mixed solvent after extraction through a detector, and transmit the actual concentration data to the controller. The controller compares the relationship between the actual concentration and the lower limit value of the concentration of the target substance to be extracted.

[0074] Step 400: If the actual concentration is higher than the lower limit value of the concentration, the controller calculates the supplementary amount of the extraction solvent with the standard concentration required according to the total volume and supplements it into the cavity. At the same time, open the three-way regulating valve so that all the mixed solvent flows back to the cavity to mix and obtain a new extraction solvent.

[0075] If the actual concentration is lower than the lower limit value of the concentration, the controller calculates the supplementary amount of the extraction solvent with the standard concentration and the usage amount of the mixed solvent to be pumped into the cavity according to the principle of constant total volume and the solvent extraction condition (the solvent finally fed into the cavity cannot be lower than the lower limit value of the concentration).

[0076] If the amount of the mixed solvent exceeds the usage amount, the excess mixed solvent is sent into the storage container.

[0077] Step 500: Continue to add the extract to be extracted into the cavity and cycle in turn.

[0078] According to this method, in this embodiment, the extraction solvent with the standard concentration used can be reused repeatedly during the continuous extraction of the same extract, and the mixed solvent after each extraction is used for the next extraction as much as possible to save the usage amount of the extraction solvent with the standard concentration as much as possible.

[0079] In practical applications, when the amount of the extraction solvent with the standard concentration to be supplemented is too large, for example, exceeding 70% of the total volume, the utilization benefit of the mixed solvent is not obvious, after all, the secondary use of the mixed solvent is not as good as that of the extraction solvent with the standard concentration.

[0080] However, if the usage amount of the extraction solvent with the standard concentration is greatly reduced as a whole, the cost can be reduced to a great extent and the benefit can be improved.

[0081] Therefore, an upper limit value is set for the supplementary amount of the extraction solvent with the standard concentration, and the upper limit value is preferably 50% - 70% of the total volume, generally preferably 60%.

[0082] The specific implementation method is as follows:

[0083] An upper limit value for the supplementary amount of the extraction solvent with the standard concentration is also set in the controller, and the reflux of the mixed solvent must satisfy that the supplementary amount is lower than the upper limit value.

[0084] When the supplementary amount exceeds the upper limit value, directly pump all the mixed solvent into the storage container and add all the extraction solvent with the standard concentration into the cavity.

[0085] Considering this upper limit value, the secondary use of the mixed solvent has greater limitations compared to the situation without an upper limit value, that is, the mixed solvent cannot be reused due to this upper limit value (especially after the mixed solvent has been used 1 - 2 times). At this time, it is chosen to be stored in a storage container.

[0086] However, if the concentration of the previously extra mixed solvent can meet the requirements for secondary use, the mixed solvent in the storage container can be reused in this case. The specific method is as follows:

[0087] The concentration and capacity of the mixed solvent in each storage container are stored in the controller;

[0088] When the mixed solvent to be refluxed in the cavity cannot meet the reflux conditions, while some or all of the combinations in one or more storage containers can meet the reflux conditions, the mixed container that cannot meet the reflux conditions is pumped into a waste liquid container connected to the second output port of the three-way regulating valve, and the mixed solvent in the storage container is pumped into the cavity.

[0089] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. An automatic proportioning system for extraction solvents, characterized in that, Comprising: A cavity (1) with a fixed total capacity when extracting a target substance by a solvent method and extracting a target value. One end is provided with a solvent inlet (2) for delivering an extraction solvent into the cavity (1), and the other end is provided with a solvent outlet (3) for discharging the remaining mixed solvent after extraction. A separation port (4) for discharging the extracted target substance is further provided on the cavity (1). Both the solvent inlet (2) and the separation port (4) are equipped with valves for controlling the opening and closing states; A solvent adding device (5) with its output end connected to the solvent inlet (2). The solvent adding device (5) is used to provide an extraction solvent with a standard concentration; A reflux pipeline (6) with one end connected to the solvent outlet (3) and the other end connected to the solvent inlet (2). A first pump (7) and a three-way regulating valve (8) are sequentially arranged on the reflux pipeline (6). The first pump (7) is used to provide power for the reflux of the mixed solvent to the cavity (1), and the second output port (9) of the three-way regulating valve (8) is connected to at least one storage container (10); A detector (11) arranged in the cavity (1) for detecting the actual concentration of the mixed solvent; A controller (12) respectively connected to the detector (11), the valve, the first pump (7), and the three-way regulating valve (8). The controller (12) is used to calculate the amount of the mixed solvent for reflux and the supplementary amount of the extraction solvent with a standard concentration according to the actual concentration, the total capacity of the cavity (1), and the lower limit value of the concentration of the extracted target substance; Wherein, the storage container (10) is used to store the excess mixed solvent after reflux.

2. An automatic proportioning system for an extraction solvent according to claim 1, characterized in that The cavity (1) includes a connected mixing chamber (101) and an extraction chamber (102). The solvent inlet (2) is arranged on the mixing chamber (101). The outlet end of the reflux pipeline (6) is connected to the solvent inlet (2) on the mixing chamber (101), and a mixer is arranged in the mixing chamber (101).

3. An automatic proportioning system for an extraction solvent according to claim 2, characterized in that The storage container (10) is connected to the mixing chamber (101) through a pipeline a (103), and a second pump (104) and a control valve (105) are arranged on the pipeline a (103). The second pump (104) is used to pump the solvent in the storage container (10) to the mixing chamber (101); And both the second pump (104) and the second control valve (105) are connected to the controller (12).

4. An automatic proportioning system for an extraction solvent according to claim 2 or 3, characterized in that There are 3 storage containers (10). The second output port (9) of the three-way regulating valve (8) is respectively connected to each storage container (10) through a shunt pipeline (13), and a first control valve (105) is arranged on each shunt pipeline (13); The first control valve (105) is connected to the controller (12); Each of the storage containers (10) is respectively used to store mixed solvents with different concentrations.

5. The automatic proportioning system for an extraction solvent according to claim 4, wherein It further includes a waste liquid container for collecting the wasted mixed solvent during the extraction process.

6. The automatic proportioning system for an extraction solvent according to claim 1, wherein The detector (11) includes an optical concentration sensor or a conductivity sensing probe.

7. An automatic proportioning method for an automatic proportioning system of the extraction solvent according to any one of claims 1-6, characterized in that, It includes the following steps: Step 100: Add the substance to be extracted into the cavity, and add the extraction solvent with a standard concentration through the solvent adding device, and set the lower limit value of the concentration of the extraction solvent used to extract the target substance in the cavity, that is, the concentration of the extraction solvent under the solvent extraction condition must be greater than the lower limit value; Step 200: After the extraction is completed, discharge the upper-layer target extract through the separation port and then close the separation port; Step 300: Obtain the actual concentration of the remaining mixed solvent after the extraction is completed through the detector, and transmit the actual concentration data to the controller, and the controller compares the relationship between the actual concentration and the lower limit value of the concentration of the target substance to be extracted; Step 400: If the actual concentration is higher than the lower limit value, the controller calculates the supplementary amount of the extraction solvent with a standard concentration required according to the total volume and supplements it into the cavity, and at the same time opens the three-way regulating valve so that all the mixed solvent flows back to the cavity to mix to obtain a new extraction solvent; If the actual concentration is lower than the lower limit value, the controller calculates the supplementary amount of the extraction solvent with a standard concentration required and the amount of the mixed solvent used according to the principle of constant total volume and the solvent extraction condition and pumps them into the cavity; If the amount of the mixed solvent exceeds the usage amount, the excess mixed solvent is sent into the storage container; Step 500: Continue to add the substance to be extracted into the cavity and cycle in turn.

8. The automatic proportioning method according to claim 7, wherein An upper limit value of the supplementary amount of the extraction solvent with a standard concentration is also set in the controller, and the reflux of the mixed solvent must satisfy that the supplementary amount is lower than the upper limit value; When the supplementary amount exceeds the upper limit value, directly pump all the mixed solvent into the storage container and add all the extraction solvent with a standard concentration into the cavity.

9. The automatic proportioning method according to claim 8, wherein The concentration and volume of the mixed solvent in each of the storage containers are stored in the controller; When the mixed solvent to be refluxed in the cavity cannot meet the reflux condition, and part or all of the combinations of one or more storage containers can meet the reflux condition, then pump the mixed containers that cannot meet the reflux condition into a waste liquid container connected to the second output port of the three-way regulating valve, and pump the mixed solvent in the storage container into the cavity.

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