A method and system for controlling the critical point of extraction and separation of two-phase substances in a transparent container

Abstract

The present invention provides a method for controlling the critical point of extraction and separation of two-phase substances in a transparent container, including: obtaining the light intensity Xcd received by the light intensity sensor corresponding to the light emitted by the laser generator passing horizontally through phase A, obtaining the light intensity Ycd received by the light intensity sensor corresponding to the light emitted by the laser generator passing horizontally through the stratification interface, and obtaining the light intensity Zcd received by the light intensity sensor corresponding to the light emitted by the laser generator passing horizontally through phase B; when it is monitored that the light intensity Z’cd fed back by the light intensity sensor is equal to Xcd, the valve is controlled to close; or when it is monitored that the light intensity Z’cd fed back by the light intensity sensor is first equal to Ycd and then equal to Xcd, the valve is controlled to close. The present invention can not only accurately control the critical point of extraction and separation of two-phase substances, greatly improve the accuracy during extraction and separation, but also there is almost no residual phase in the container after the two-phase substances undergo a single separation process.

Description

Technical Field

[0001] The present invention belongs to the technical field of extraction and separation control of liquid substances, and particularly relates to a method for controlling the extraction and separation critical point of two-phase substances in a transparent container. Background Art

[0002] In the actual production processes of chemical experiments and chemical products, the extraction and separation of two-phase substances are often involved. At present, there are two control methods for extraction and separation. One is to implement secondary or multiple extraction and separation processes. By observing the position of the stratification interface during extraction and separation with the naked eye of an operator, when the liquid phase on one side of the stratification interface is completely separated each time, it can be considered that a single separation is completed. The other is to use automated equipment for the extraction and separation of two-phase substances. For example, the technical solution disclosed in Document CN102980863B: The automatic extraction and separation detection device includes an extraction container, an injection port is provided on the extraction container, and a first channel is provided at the bottom end of the extraction container; a detection cell, the detection cell is located at the lower end of the extraction container, and the detection cell is communicated with the extraction container through the first channel; a light source and a detector for receiving the light of the light source, the light source is provided on one side of the detection cell, and the detector is provided on the other side of the detection cell; a first switch for controlling the opening and closing of the first channel. When in use, the light source and the detector for receiving the light of the light source are respectively placed on both sides of the detection cell, and the detector detects the light after penetrating the extractant containing the extraction component to measure the concentration of the extraction component.

[0003] Although the foregoing automatic extraction and separation detection device can achieve the extraction and separation detection of two-phase toxic and harmful substances (judging the concentration of the extraction component contained in the extraction layer) while avoiding harm to the human body, there are still some problems: the accuracy during extraction and separation is poor, especially the extraction and separation critical point of two-phase substances cannot be controlled.

[0004] For some organic phases that are difficult to synthesize or are expensive, accurately controlling the extraction and separation critical point of two-phase substances is beneficial to significantly reducing secondary or multiple extraction and separation processes and reducing the extraction cost. However, how to complete the one-time separation of two-phase substances during the extraction process is a technical difficulty in this field. Summary of the Invention

[0005] At least aiming at the problems mentioned in the background art, the purpose of the present invention is to provide a method for controlling the extraction and separation critical point of two-phase substances in a transparent container.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions.

[0007] A method for controlling the extraction and separation critical point of two-phase substances in a transparent container determines the extraction and separation critical point of two-phase substances by means of the attenuation difference of the light emitted by a laser generator in different phase substances.

[0008] A preferred embodiment of the method for controlling the critical point of extraction and separation of two-phase substances in a transparent container according to the present invention includes the following steps in sequence:

[0009] Step 1: After adjusting the transparent container containing the two-phase substances with a layered interface to a vertical state and fixing it, ensure that the valve on the liquid outlet pipe of the transparent container is closed. Define the upper substance as phase A and the lower substance as phase B.

[0010] Step 2: First, adjust the positions of the laser generator (which can be regarded as the first laser generator) and the light intensity sensor (which can be regarded as the first light intensity sensor) so that the light emitted by the laser generator (which can be regarded as the first laser generator) passes horizontally through phase A. At this time, the light intensity received by the light intensity sensor (which can be regarded as the first light intensity sensor) is defined as Xcd.

[0011] Step 3: Second, adjust the positions of the laser generator (which can be regarded as the third laser generator) and the light intensity sensor (which can be regarded as the third light intensity sensor) so that the light emitted by the laser generator (which can be regarded as the third laser generator) passes horizontally through the layered interface. At this time, the light intensity received by the light intensity sensor (which can be regarded as the third light intensity sensor) is defined as Ycd.

[0012] Step 4: Third, adjust the positions of the laser generator (which can be regarded as the second laser generator) and the light intensity sensor (which can be regarded as the second light intensity sensor) so that the light emitted by the laser generator (which can be regarded as the second laser generator) passes horizontally through phase B. At this time, the light intensity received by the light intensity sensor (which can be regarded as the second light intensity sensor) is defined as Zcd.

[0013] Step 5: Fourth, adjust the positions of the laser generator (which can be regarded as the second laser generator) and the light intensity sensor (which can be regarded as the second light intensity sensor) so that the light emitted by the laser generator (which can be regarded as the second laser generator) passes horizontally through phase B at the upper edge of the valve.

[0014] Step 6: Open the valve and start separating phase B at a preset flow rate Q. During this process, the light intensity feedback by the light intensity sensor (which can be regarded as the second light intensity sensor) is Zcd.

[0015] Step 7: As phase B continues to be separated, when it is monitored that the light intensity feedback by the light intensity sensor (which can be regarded as the second light intensity sensor) changes from Ycd to Xcd, close the valve.

[0016] Another preferred embodiment of the method for controlling the critical point of extraction and separation of two-phase substances in a transparent container according to the present invention includes the following steps in sequence:

[0017] Step 11: After adjusting the transparent container containing the two-phase substance with a layered interface to a horizontal state, fix it. At the same time, ensure that the valve on the liquid outlet pipe of the transparent container is closed. Define the upper substance as phase A and the lower substance as phase B.

[0018] Step 12: Adjust the positions of the two sets of laser generators and their light intensity sensors so that the light emitted by the first laser generator passes horizontally through phase A. At this time, the light intensity received by the first light intensity sensor is defined as Xcd. Make the light emitted by the second laser generator pass horizontally through phase B at the upper edge of the valve. At this time, the light intensity received by the second light intensity sensor is defined as Zcd.

[0019] Step 13: Open the valve and start separating phase B at a preset flow rate Q. During this process, the light intensity feedback by the second light intensity sensor is Zcd.

[0020] Step 14: As phase B continues to be separated, when it is monitored that the light intensity feedback by the second light intensity sensor (the light intensity sensor corresponding to the upper edge of the valve) becomes Xcd, close the valve.

[0021] To further improve the accuracy of controlling the extraction and separation critical point of the two-phase substance, the diameter of the light emitted by the laser generator is not greater than 1 mm.

[0022] Preferably, phase A is a transparent organic phase and phase B is an aqueous phase.

[0023] More preferably, when it is monitored that the light intensity feedback by the light intensity sensor (the second light intensity sensor) corresponding to the upper edge of the valve just becomes Xcd, continue to maintain for a preset time t and then immediately close the valve; the preset time t is calculated according to formula (Ⅰ);

[0024] t = L / Q …………… (Ⅰ)

[0025] In the formula, L represents the volume of the remaining phase in the transparent container and at the upper edge of the valve. The upper end face of the remaining phase is flush with the light corresponding to the upper edge of the valve, and the lower end face of the remaining phase is the top surface of the valve core of the valve; Q represents the unit flow rate when separating phase B; the remaining phase refers to non-pure phase A, including phase B and the layered interface substance (the mixed substance of phase A and phase B).

[0026] Preferably, the liquid outlet pipe of the transparent container is a cylindrical pipe.

[0027] A control system using the method of the present invention includes a controller. The controller is connected to the valve, the laser generator, and the light intensity sensor monitor and controls their operations. When the processor of the controller executes its program, the following steps are implemented:

[0028] S1. Obtain the light intensity Xcd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through phase A, obtain the light intensity Ycd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through the stratified interface, and obtain the light intensity Zcd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through phase B. The obtained light intensities are stored as different thresholds respectively.

[0029] S2. Control the valve to open so that phase B in the transparent container starts to be separated out at a preset flow rate Q. During this process, the light intensity Z’cd feedback by the light intensity sensor is obtained in real time.

[0030] S3. When it is monitored that the light intensity Z’cd feedback by the light intensity sensor is equal to Xcd, control the valve to close; or when it is monitored that the light intensity Z’cd feedback by the light intensity sensor is first equal to Ycd and then equal to Xcd, control the valve to close.

[0031] S4. Control the laser generator and the intensity sensor to close.

[0032] A control system adopting the method of the present invention includes a controller. The controller is connected to the valve, the laser generator, and the light intensity sensor monitor and controls their operations. When the processor of the controller executes its program, the following steps are implemented:

[0033] S11. Obtain the light intensity Xcd received by the first light intensity sensor and the light intensity Zcd received by the second light intensity sensor. The obtained light intensities are stored as different thresholds respectively.

[0034] S12. Control the valve to open so that phase B in the transparent container starts to be separated out at a preset flow rate Q. During this process, the light intensity Z’cd feedback by the second light intensity sensor is obtained in real time.

[0035] S13. When it is monitored that the light intensity Z’cd feedback by the second light intensity sensor is exactly equal to Xcd, mark it as time node T1, continue to keep the valve open, and control the valve to close at time node T1 + t; the preset time t is calculated according to formula (Ⅰ);

[0036] t = L / Q …………… (Ⅰ)

[0037] In the formula, L represents the residual phase volume in the transparent container and at the upper edge of the valve. The upper end face of the residual phase is flush with the light corresponding to the upper edge of the valve, and the lower end face of the residual phase is the top surface of the valve core; Q represents the unit flow rate when separating out phase B; the residual phase refers to non-pure phase A, including phase B and stratified interface substances (mixed substances of phase A and phase B);

[0038] S14. Control the laser generator and the intensity sensor to close.

[0039] Beneficial effects: By adopting the solution of the present invention, not only can the extraction and separation critical point of two-phase substances be accurately controlled, and the accuracy during extraction and separation can be greatly improved (after a single separation process, there is almost no remaining phase in the container), but also the secondary or multiple extraction and separation processes can be greatly reduced, the extraction cost can be lowered, and a single separation can meet the requirements; by adopting the solution of the present invention, the operation is simple and fast, and it is applicable to the extraction and separation of two-phase substances in the process of chemical experiments as well as in the actual production process of chemical products. Description of the Drawings

[0040] Figure 1 It is a schematic diagram of the instrument used in the control process of the extraction and separation critical point of two-phase substances in Example 1; Figure 2 It is a schematic diagram of the instrument used in the control process of the extraction and separation critical point of two-phase substances in Example 2. Detailed Embodiments

[0041] The present invention will be further described below in conjunction with the drawings and specific embodiments. However, the description of the following embodiments is only used to help understand the principle and its core idea of the present invention, and does not limit the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, improvements made to the present invention without departing from the principle of the present invention also fall within the protection scope of the claims of the present invention.

[0042] Example 1

[0043] A method for controlling the extraction and separation critical point of two-phase substances in a transparent container, in combination with Figure 1 as shown, the steps sequentially include:

[0044] Step 11: After adjusting the transparent container 9 containing the two-phase substances with the layered interface 6 to a horizontal state and fixing it, at the same time, ensure that the valve 2 on the liquid outlet pipe 1 of the transparent container 9 (the valve 2 adopts an electric control valve) is closed. Define the upper-layer substance as phase A 12 and the lower-layer substance as phase B 5;

[0045] Step 12: Adjust the positions of two sets of laser generators and their light intensity sensors so that the light emitted by the first laser generator 8 passes horizontally through phase A 12. At this time, the light intensity received by the first light intensity sensor 7 is defined as Xcd, and make the light emitted by the second laser generator 4 pass horizontally through phase B 5 at the upper edge of the valve 2. At this time, the light intensity received by the second light intensity sensor 3 is defined as Zcd;

[0046] Step 13: Open the valve 2 and start to separate phase B 5 at a preset flow rate Q. During this process, the light intensity feedback by the second light intensity sensor 3 is Zcd;

[0047] Step 14. As the B-phase 5 continues to separate, when it is detected that the light intensity feedback by the second light intensity sensor 3 becomes Xcd, close the valve 2.

[0048] Embodiment 2

[0049] A method for controlling the critical point of extraction and separation of two-phase substances in a transparent container, the steps sequentially include:

[0050] Step 1. After adjusting the transparent container 9 containing the two-phase substances with the layered interface 6 to the vertical state and fixing it, at the same time ensure that the valve 2 on the liquid outlet pipe 1 of the transparent container 9 is closed. Define the upper-layer substance as the A-phase 12 and the lower-layer substance as the B-phase 5.

[0051] Step 2. Adjust the positions of the laser generator (which can be regarded as the first laser generator 8) and the light intensity sensor (which can be regarded as the first light intensity sensor 7) for the first time, so that the light emitted by the laser generator (which can be regarded as the first laser generator 8) passes horizontally through the A-phase. At this time, the light intensity received by the light intensity sensor (which can be regarded as the first light intensity sensor 7) is defined as Xcd.

[0052] Step 3. Adjust the positions of the laser generator (which can be regarded as the third laser generator 4) and the light intensity sensor (which can be regarded as the third light intensity sensor 3) for the second time, so that the light emitted by the laser generator (which can be regarded as the third laser generator 4) passes horizontally through the layered interface. At this time, the light intensity received by the light intensity sensor (which can be regarded as the third light intensity sensor 3) is defined as Ycd.

[0053] Step 4. Adjust the positions of the laser generator (which can be regarded as the second laser generator 11) and the light intensity sensor (which can be regarded as the second light intensity sensor 10) for the third time, so that the light emitted by the laser generator (which can be regarded as the second laser generator 11) passes horizontally through the B-phase. At this time, the light intensity received by the light intensity sensor (which can be regarded as the second light intensity sensor 10) is defined as Zcd.

[0054] Step 5. Adjust the positions of the laser generator (which can be regarded as the second laser generator 4) and the light intensity sensor (which can be regarded as the second light intensity sensor 3) for the fourth time, so that the light emitted by the laser generator (which can be regarded as the second laser generator 4) passes horizontally through the B-phase at the upper edge of the valve.

[0055] Step 6. Open the valve and start separating the B-phase at the preset flow rate Q. During this process, the light intensity feedback by the light intensity sensor (which can be regarded as the second light intensity sensor 3) is Zcd.

[0056] Step 7. As the B-phase continues to separate, when it is detected that the light intensity feedback by the light intensity sensor (which can be regarded as the second light intensity sensor 3) changes from Ycd to Xcd, close the valve.

[0057] In this embodiment, the first laser generator 8, the second laser generator 4, and the third laser generator 4 can be the same laser generator or three laser generators of the same specification. When they are the same laser generator, Figure 2 the illustration shows that the laser generator and its light intensity sensor are in different positions.

[0058] Embodiment 3

[0059] A control system adopts the two-phase substance extraction and separation critical point control method in Embodiment 1. The control system includes a controller, which is connected to a valve 2, a laser generator, and a light intensity sensor monitor and controls their operations. When the processor of the controller executes its program, the following steps are implemented:

[0060] S11, Obtain the light intensity Xcd received by the first light intensity sensor 7, and obtain the light intensity Zcd received by the second light intensity sensor 3. The obtained light intensities are stored as different thresholds respectively;

[0061] S12, Control the valve 2 to open, so that the B-phase 5 in the transparent container 9 starts to separate (flow out) at a preset flow rate Q. During this process, the light intensity Z’cd fed back by the second light intensity sensor 3 is obtained in real time;

[0062] S13, When it is monitored that the light intensity Z’cd fed back by the second light intensity sensor 3 is exactly equal to Xcd, it is recorded as the time node T1. Keep the valve 2 open and control the valve 2 to close at the time node T1 + t; the preset time t is calculated according to formula (Ⅰ);

[0063] t = L / Q …………… (Ⅰ)

[0064] In the formula, L represents the residual phase volume in the transparent container 9 and at the upper edge of the valve 2. The upper end face of the residual phase is flush with the light ray corresponding to the upper edge of the valve 2, and the lower end face of the residual phase is the top surface of the valve core of the valve 2; Q represents the unit flow rate when separating the B-phase 5; the residual phase refers to non-pure A-phase 12, including B-phase 5 and the substances at the separation interface 6 (or the mixed substances of A-phase 12 and B-phase 5);

[0065] Suppose the preset flow rate Q is 5 ml / s and the residual phase volume in the transparent container 9 and at the upper edge of the valve 2 is 10 ml, then the preset time t = 10 ml / 5 = 2 s. Again, suppose that at exactly 14:00 on a certain day, it is monitored that the light intensity Z’cd fed back by the second light intensity sensor 3 is exactly equal to Xcd, then the valve 2 is controlled to close at 14:00:02 on that day;

[0066] S14, Control the laser generator and the intensity sensor to close.

[0067] Example 4

[0068] A control system adopts the two-phase substance extraction and separation critical point control method in Example 2. The control system includes a controller, which is connected to valve 2, a laser generator, and a light intensity sensor monitor and controls their operations. Three laser generators and three light intensity sensors are respectively adopted, and their position arrangements refer to Figure 2 , and when the processor of the controller executes its program, the following steps are implemented:

[0069] S1. Obtain the light intensity Xcd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through phase A 12, obtain the light intensity Ycd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through the stratification interface 6, and obtain the light intensity Zcd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through phase B 5. The obtained light intensities are respectively stored as different thresholds;

[0070] S2. Control valve 2 to open, so that phase B 5 in the transparent container 9 starts to be separated out at a preset flow rate Q. During this process, the light intensity Z’cd fed back by the light intensity sensor is obtained in real time;

[0071] S3. When it is monitored that the light intensity Z’cd fed back by the light intensity sensor first equals Ycd and then equals Xcd, control valve 2 to close.

[0072] S4. Control the laser generator and the intensity sensor to close.

[0073] Example 5

[0074] A control system adopts the two-phase substance extraction and separation critical point control method in Example 2. The control system includes a controller, which is connected to valve 2, a laser generator, and a light intensity sensor monitor and controls their operations. Three laser generators and three light intensity sensors are respectively adopted, and their position arrangements refer to Figure 2 , and when the processor of the controller executes its program, the following steps are implemented:

[0075] S1. Obtain the light intensity Xcd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through phase A 12, obtain the light intensity Ycd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through the stratification interface 6, and obtain the light intensity Zcd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through phase B 5. The obtained light intensities are respectively stored as different thresholds;

[0076] S2. Control valve 2 to open, so that phase B 5 in the transparent container 9 starts to be separated out at a preset flow rate Q. During this process, the light intensity Z’cd fed back by the light intensity sensor is obtained in real time;

[0077] S3. When it is monitored that the light intensity Z’cd fed back by the light intensity sensor first equals Ycd and then equals Xcd, it is recorded as time node T1. Keep valve 2 open continuously, and control valve 2 to close at time node T1 + t; The preset time t is calculated according to formula (Ⅰ);

[0078] t = L / Q …………… (Ⅰ)

[0079] In the formula, L represents the residual phase volume in the transparent container 9 and at the upper edge of valve 2. The upper end face of the residual phase is flush with the light ray corresponding to the upper edge of valve 2, and the lower end face of the residual phase is the top surface of the valve core of valve 2; Q represents the unit flow rate when separating out phase B 5; The residual phase refers to non-pure phase A 12, including phase B 5 and the substances at the stratification interface 6 (or the mixed substances of phase A 12 and phase B 5);

[0080] If the preset flow rate Q is 2 ml / s and the residual phase volume in the transparent container 9 and at the upper edge of valve 2 is 10 ml, then the preset time t = 10 ml / 2 = 5 s. Again, if it is monitored within three seconds after 15:00 on a certain day that the light intensity Z’cd fed back by the second light intensity sensor 3 first equals Ycd and then equals Xcd, then control valve 2 to close at 15:00:08 on that day;

[0081] S14. Control the laser generator and the intensity sensor to close.

[0082] In each embodiment, the diameter of the light ray emitted by the laser generator is not greater than 1 mm.

[0083] In a specific application scenario, the inner diameter of the liquid outlet pipe 1 of the transparent container 9 is 5 mm, phase A 12 is a certain transparent organic phase, phase B 5 is an aqueous phase, and the thickness of the stratification interface 6 is 3 mm. Adopting the solutions in Embodiments 1 - 4, after a single separation process of the two-phase substances, the residual phase in the container is only about 1 - 2 ml.

[0084] Adopting the solution of the embodiment can not only accurately control the extraction and separation critical point of the two-phase substances, greatly improve the accuracy during extraction and separation (after a single separation process of the two-phase substances, there is almost no residual phase in the container), but also greatly reduce the secondary or multiple extraction and separation processes, reduce the extraction cost, and a single separation can meet the requirements; Adopting the solution in the embodiment is simple and fast to operate, and is applicable to the extraction and separation of two-phase substances in both the chemical experiment process and the actual production process of chemical products.

Claims

1. A method for controlling the critical point of extraction and separation of two-phase substances in a transparent container, characterized in that: Determine the extraction separation critical point of the two-phase substances by means of the attenuation difference of the light emitted by the laser generator in different-phase substances. The diameter of the light emitted by the laser generator is not greater than 1 mm; (a)The steps of the method sequentially include: Step 1: After adjusting the transparent container containing the two-phase substances with a layered interface to a vertical state, fix it. At the same time, ensure that the valve on the liquid outlet pipe of the transparent container is closed. Define the upper-layer substance as phase A and the lower-layer substance as phase B; phase A is a transparent organic phase and phase B is an aqueous phase; Step 2: Adjust the positions of the laser generator and the light intensity sensor for the first time, so that the light emitted by the laser generator horizontally passes through phase A. At this time, the light intensity received by the light intensity sensor is defined as Xcd; Step 3: Adjust the positions of the laser generator and the light intensity sensor for the second time, so that the light emitted by the laser generator horizontally passes through the layered interface. At this time, the light intensity received by the light intensity sensor is defined as Ycd; Step 4: Adjust the positions of the laser generator and the light intensity sensor for the third time, so that the light emitted by the laser generator horizontally passes through phase B. At this time, the light intensity received by the light intensity sensor is defined as Zcd; Step 5: Adjust the positions of the laser generator and the light intensity sensor for the fourth time, so that the light emitted by the laser generator horizontally passes through phase B at the upper edge of the valve; Step 6: Open the valve and start separating phase B at a preset flow rate Q. During this process, the light intensity feedback by the light intensity sensor is Zcd; Step 7: As phase B continues to be separated, when it is monitored that the light intensity feedback by the light intensity sensor changes from Ycd to Xcd, close the valve; Or, (b)The steps of the method sequentially include: The steps sequentially include: Step 11: After adjusting the transparent container containing the two-phase substances with a layered interface to a horizontal state, fix it. At the same time, ensure that the valve on the liquid outlet pipe of the transparent container is closed. Define the upper-layer substance as phase A and the lower-layer substance as phase B; phase A is a transparent organic phase and phase B is an aqueous phase; Step 12: Adjust the positions of two sets of laser generators and their light intensity sensors, so that the light emitted by the first laser generator horizontally passes through phase A. At this time, the light intensity received by the first light intensity sensor is defined as Xcd, and make the light emitted by the second laser generator horizontally pass through phase B at the upper edge of the valve. At this time, the light intensity received by the second light intensity sensor is defined as Zcd; Step 13: Open the valve and start separating phase B at a preset flow rate Q. During this process, the light intensity feedback by the second light intensity sensor is Zcd; Step 14: As phase B continues to be separated, when it is monitored that the light intensity feedback by the second light intensity sensor changes to Xcd, close the valve; When it is monitored that the light intensity feedback by the light intensity sensor corresponding to the upper edge of the valve just changes to Xcd, continue to maintain for a preset time t and then immediately close the valve; the preset time t is calculated according to formula (Ⅰ); t = L / Q …………… (Ⅰ) Wherein, L represents the residual phase volume in the transparent container and at the upper edge of the valve, the upper end face of the residual phase is flush with the light corresponding to the upper edge of the valve, and the lower end face of the residual phase is the top surface of the valve core; Q represents the unit flow rate when separating phase B; the residual phase refers to non-pure phase A, including phase B and the interfacial layer substance, or the mixture of phase A and phase B.

2. The method according to claim 1, wherein: The liquid outlet pipe of the transparent container is a cylindrical pipe.

3. A control system adopting the method as described in claim 1, characterized in that, It includes a controller which is connected to the valve, the laser generator and the light intensity sensor monitor and controls their operations. When the processor of the controller executes its program, the following steps are implemented: S1, Obtain the light intensity Xcd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through phase A, obtain the light intensity Ycd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through the interfacial layer, and obtain the light intensity Zcd received by the light intensity sensor when the light emitted by the laser generator horizontally passes through phase B. The obtained light intensities are stored as different thresholds respectively. S2, Control the valve to open, so that phase B in the transparent container starts to be separated according to the preset flow rate Q. During this process, the light intensity Z’cd feedback by the light intensity sensor is obtained in real time. S3, When it is monitored that the light intensity Z’cd feedback by the light intensity sensor is equal to Xcd, control the valve to close; or when it is monitored that the light intensity Z’cd feedback by the light intensity sensor is first equal to Ycd and then equal to Xcd, control the valve to close. S4, Control the laser generator and the intensity sensor to close.

4. A control system using the method as described in claim 1, characterized in that, It includes a controller which is connected to the valve, the laser generator and the light intensity sensor monitor and controls their operations. When the processor of the controller executes its program, the following steps are implemented: S11, Obtain the light intensity Xcd received by the first light intensity sensor and the light intensity Zcd received by the second light intensity sensor. The obtained light intensities are stored as different thresholds respectively. S12, Control the valve to open, so that phase B in the transparent container starts to be separated according to the preset flow rate Q. During this process, the light intensity Z’cd feedback by the second light intensity sensor is obtained in real time. S13, When it is monitored that the light intensity Z’cd feedback by the second light intensity sensor is just equal to Xcd, record it as time node T1, continue to keep the valve open, and control the valve to close at time node T1 + t; the preset time t is calculated according to formula (Ⅰ). t = L / Q …………… (Ⅰ) Wherein, L represents the residual phase volume in the transparent container and at the upper edge of the valve, the upper end face of the residual phase is flush with the light corresponding to the upper edge of the valve, and the lower end face of the residual phase is the top surface of the valve core; Q represents the unit flow rate when separating phase B; the residual phase refers to non-pure phase A, including phase B and the interfacial layer substance, or the mixture of phase A and phase B. S14, Control the laser generator and the intensity sensor to close.

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