Self-balancing multiphase self-shunting device and control method

Abstract

The invention discloses a self-balancing multiphase self-shunting device and a control method, and belongs to the technical field of chemical separation. The device comprises an automatic split-phase tank (1), a pressure display A (2), a system pressure automatic controller (3), a light phase collecting tank (4), a liquid discharge valve A (5), a pressure display B (6), a material inlet (7), a light phase overflow port (8), a heavy phase extraction port (9), a split-phase internal component (10), a liquid discharge valve C (11), a heavy phase extraction automatic regulating valve (12), a heavy phase collecting tank (13) and the like. The device is simple in structure and control method, can be operated at normal pressure or under pressure, is high in operation elasticity, realizes self-balance of the liquid level height by utilizing the light phase overflow port (8), realizes rapid phase separation of light and heavy components by adopting a special structure of the phase separation inner component (10), forms a stable phase interface, is good in separation effect, and is suitable for industrial production. The method can be used for chemical unit operations such as extraction separation, reaction separation and rectification.

Description

Technical field:

[0001] The present invention is a self-balancing multiphase self-dividing device and a control method, which belongs to the technical field of chemical separation and can be applied to chemical unit operations such as extraction separation, reaction separation, and distillation. Background technology:

[0002] In chemical unit operations, separation between two immiscible liquids is often encountered. Due to the different densities of the two liquids, the liquid with higher density is in the lower layer, called the heavy component, and the liquid with lower density is in the upper layer, called the light component. For example, extraction separation, water washing phase separation, separation of materials taken out from the top of the tower during distillation, etc.

[0003] Yancheng Donggang Pharmaceutical Chemical Development Co., Ltd. reported a two-phase automatic phase separation device in patent CN 208726807 U, which consists of a liquid separation tank, a feed pipe, a heavy phase receiving tank, a light phase receiving tank and a venting pipe. The top of the liquid separation tank is provided with a feed port and a venting hole, the bottom is provided with a heavy phase liquid outlet, and the side is provided with a light phase liquid outlet. The tank body is a liquid separation device; the feed pipe is connected to the feed port as a whole; the heavy phase receiving tank is connected to the heavy phase liquid outlet through a heavy phase liquid conveying pipe; the light phase receiving tank is connected to the light phase liquid outlet through a light phase liquid conveying pipe; the venting pipe is connected to the venting hole as a whole.

[0004] He Benke reported an intelligent extraction device in patent CN 107670330 A, including an extraction body, a control device and a camera device, wherein a liquid outlet pipe is installed at the bottom of the extraction body, and a liquid valve is installed on the liquid outlet pipe; scale lines are arranged on the side wall of the extraction body, and a through hole is opened on the side wall, and the through hole is arranged at intervals from the scale lines; the outer wall of the extraction body has a liquid cavity, and the liquid cavity is connected to the extraction body through the through hole; a liquid outlet is opened at the bottom of the liquid cavity; the through hole is covered with a shield plate, which is slidably installed on the extraction body, and its bottom extends to below the bottom of the extraction body and is connected to a sliding drive device located outside the extraction body; the control device is respectively connected to the sliding drive device and the camera device; the camera device is directly opposite to the part where the scale lines of the extraction body are located, and is used to photograph the situation of the stratified liquid in the extraction body after the liquid separation in the extraction body is completed.

[0005] Nantong Tianshi Chemical Co., Ltd. reported an automatic phase separation device in patent CN 211585332 U, including a separation tank, with a heavy component liquid outlet and a light component liquid outlet on the left and right sides of the separation tank respectively. The heavy component liquid outlet is located at a lower position, and the light component liquid outlet is located at a higher position. The different densities of the two liquids are mainly used for rough separation.

[0006] Limin Chemical Co., Ltd. reported in patent CN 211798975 U an automatic phase separation device for liquid-liquid two phases, which consists of a phase separation tank, a hydrometer, a liquid level meter, a light phase receiving tank and a heavy phase receiving tank located below the phase separation tank, and a computer control system DCS / PLC. The hydrometer detects changes in liquid density and transmits signals to the computer control system, thereby opening and closing valves to achieve automatic control.

[0007] On December 23, 2017, the applicant applied to the State Intellectual Property Office for an invention patent entitled "Special Distillation Self-Balancing Phase Separation Pumpless Reflux Control Method" with application number 201711499100.3. The light and heavy phase components extracted from the top of the distillation tower are separated according to their densities in the self-balancing phase separation reflux device using specially designed internal components. One phase is extracted and the other phase is refluxed into the distillation tower.

[0008] The applicant applied to the State Intellectual Property Office on September 5, 2019 and was authorized and announced on August 4, 2020 for a utility model patent entitled "A kind of extraction automatic phase separation integrated control system", with application number 201921514313.3. The liquid level meter is used to monitor the height of the liquid in the tank, and the feed valve, discharge valve, light phase liquid outlet valve, heavy phase liquid outlet valve, light phase reflux valve, heavy phase reflux valve, etc. are automatically controlled by PLC.

[0009] The applicant believes that there is room for optimization in the processes of the above two patent applications, which can make the process of the device simpler and have a wider scope of application. Summary of the invention:

[0010] The technical problem to be solved by the present invention is to provide a self-balancing multiphase self-dividing device and control method with simple structure, large operational flexibility, stable phase interface (including gas-liquid phase interface, liquid-liquid phase interface) control, and self-powered control.

[0011] The self-balancing multiphase self-flow splitting device comprises an automatic phase separation tank (1), a pressure display A (2), a system pressure automatic controller (3), a light phase collection tank (4), a liquid discharge valve A (5), a pressure display B (6), a material inlet (7), a light phase overflow port (8), a heavy phase production port (9), a phase separation internal component (10), a liquid discharge valve C (11), a heavy phase production automatic regulating valve (12), a heavy phase collection tank (13), a pressure display C (14), an automatic pressure regulator (15) and a liquid discharge valve B (16), wherein the top of the automatic phase separation tank (1) is connected to the pressure display A (2), the inlet of the system pressure automatic controller (3) and the top of the light phase collection tank (4) through pipelines, the outlet of the system pressure automatic controller (3) is directly vented, and the bottom ... and the outlet of the system pressure automatic controller (3) is directly vented. The tank body of the automatic phase separation tank (1) is connected to a discharge valve A (5) and a pressure display B (6) through pipelines. The tank body of the automatic phase separation tank (1) is sequentially provided with: a material inlet (7), a light phase overflow port (8) and a heavy phase production port (9) from top to bottom. The material inlet (7) is connected to a phase separation internal component (10) through a pipeline. The light phase overflow port (8) is connected to a light phase collection tank (4) through a pipeline. The bottom of the light phase collection tank (4) is connected to a discharge valve C (11). The heavy phase production port (9) is sequentially connected to a heavy phase production automatic regulating valve (12) and a heavy phase collection tank (13) through pipelines. The top of the heavy phase collection tank (13) is respectively connected to a pressure display C (14) and an automatic pressure regulator (15) through pipelines. The bottom of the heavy phase collection tank (13) is connected to a discharge valve B (16) through a pipeline.

[0012] The pressure display A (2) and the pressure display C (14) are pressure gauges or pressure sensors, and the pressure display B (6) is a pressure sensor. The pressure display B (6) interlocks and controls the opening of the heavy phase extraction automatic regulating valve (12). By collecting the electrical signal of the pressure sensor to interlock and control the opening of the heavy phase extraction automatic regulating valve (12), PID regulation is realized, which is more conducive to the stability of the control phase interface.

[0013] The phase separation internal component (10) is composed of a feed pipe (1001), an inner overflow groove (1002), an outer overflow groove (1003), a connecting rod (1004) and a drip hole (1005). The inner overflow groove (1002) is concentric with the outer overflow groove (1003). The bottom of the inner overflow groove (1002) is provided with drip holes (1005) in an annular pattern. The outer overflow groove (1003) is connected to the feed pipe (1001) via the connecting rod (1004). The height of the bottom end of the feed pipe (1001) from the bottom end of the inner overflow groove (1002) is h3, the height of the inner overflow groove (1002) is h2, and the height of the outer overflow groove (1003) is h1. The three satisfy the following relationship: h 3 = (0.2 ~ 0.4) h2, h2 = (0.3 ~ 0.8) h1, the material collides with the bottom of the inner overflow trough (1002) at high speed through the feed pipe (1001) to achieve rapid gas-liquid separation, the gas composition is upward, the light component and the heavy component are liquid-liquid separated in the inner overflow trough (1002) and the outer overflow trough (1003), the installation height of the phase separation internal component (10) is located within the light phase composition, due to the liquid density difference, the heavy component will sink through the drip holes (1005) distributed in an annular manner at the bottom of the inner overflow trough (1002), and the light component will overflow from the inner overflow trough (1002) to the outer overflow trough (1003), which will buffer the fluctuation of the light phase liquid level.

[0014] The self-balancing multi-phase self-flow control method is characterized by comprising the following steps:

[0015] Step 1: The pressure at the material inlet (7) is recorded as P0, the pressure displayed by the pressure display A (2) is recorded as P1, the pressure displayed by the pressure display B (6) is recorded as P2, the pressure displayed by the pressure display C (14) is recorded as P3, and the static pressure difference generated by the liquid between the heavy phase extraction port (9) and the light phase overflow port (8) is recorded as ΔP;

[0016] Step 2: Close the drain valve A (5), the heavy phase extraction automatic regulating valve (12) and the drain valve C (11), connect the material inlet (7) to the reaction system through a pipeline, and adjust the system pressure automatic controller (3) to control the pressure in the automatic phase separation tank (1) and the light phase collection tank (4) to be consistent with the pressure at the material inlet, that is, P0 = P1;

[0017] Step 3: Close the drain valve B (16), and introduce inert gas into the heavy phase collection tank (13) through the automatic pressure regulator (15) to ensure that the pressure P3 displayed on the pressure display C (14) satisfies: P3 = P0 + ΔP;

[0018] Step 4: When the pressure P2 displayed by the pressure display B (6) is 0.5MPa to 1.0MPa higher than the pressure P3 displayed by the pressure display C (14), the opening of the heavy phase extraction automatic regulating valve (12) is adjusted so that the difference between P2 and P3 satisfies: 0.05MPa to 0.2MPa, and the heavy phase component automatically flows into the heavy phase collection tank (13), and the light phase component automatically flows into the light phase collection tank (4) through the light phase overflow port (8), and the phase interface is controlled to be stable.

[0019] The self-balancing multiphase self-splitting device and control method provided by the present invention have the following advantages:

[0020] 1. The device structure and control method are simple, and the installation and use are convenient. The light phase component automatically overflows into the light phase collection tank (4) through the light phase overflow port (8), thereby ensuring the height of the total liquid level in the automatic phase separation tank (1).

[0021] 2. It has wide applicability and can be used for separation of liquid-liquid components (separation of two liquid components with different densities, such as extraction separation) and separation of gas-liquid-liquid components (separation of gas and two liquid components with different densities, such as reaction distillation). The automatic phase separation tank (1) is connected to a system pressure automatic controller (3), so the device can be used not only for separation at normal pressure but also for separation under pressure, and has great operational flexibility.

[0022] 3. The gas-liquid mixed material collides with the bottom of the inner overflow trough (1002) at high speed through the feed pipe (1001) to achieve rapid gas-liquid separation. The gas component is upward, and the light and heavy components are separated by liquid-liquid under the coordinated action of the inner overflow trough (1002) and the outer overflow trough (1003). The installation height of the phase separation internal component (10) is located within the light phase component. Due to the difference in liquid density, the heavy component will freely settle to the bottom of the automatic phase separation tank (1) through the drip holes (1005) distributed in an annular manner at the bottom of the inner overflow trough (1002). The light component overflows from the inner overflow trough (1002) into the outer overflow trough (1003). The light component and the heavy component enter the automatic phase separation tank (1) from two directions respectively by the gravity of the fluid itself, effectively avoiding mutual disturbance between the fluids, and well achieving the separation of the three components of gas, light component and heavy component, thereby ensuring the stable control of the phase interface (including the gas-liquid phase interface and the liquid-liquid phase interface). Description of the drawings:

[0023] Figure 1 It is a structural schematic diagram of a self-balancing multiphase self-flow splitting device.

[0024] Figure 2 It is a schematic structural diagram of the phase separation internal component (10).

[0025] Figure 3 It is a top view of the phase separation internal component (10). Specific implementation method:

[0026] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.

[0027] Embodiment 1:

[0028] In this embodiment, Figure 1The self-balancing multiphase self-dividing device shown in the figure comprises an automatic phase separation tank (1), a pressure display A (2), a system pressure automatic controller (3), a light phase collection tank (4), a liquid discharge valve A (5), a pressure display B (6), a material inlet (7), a light phase overflow port (8), a heavy phase production port (9), a phase separation internal component (10), a liquid discharge valve C (11), a heavy phase production automatic regulating valve (12), a heavy phase collection tank (13), a pressure display C (14), an automatic pressure regulator (15) and a liquid discharge valve B (16). The top of the automatic phase separation tank (1) is connected to the pressure display A (2), the inlet of the system pressure automatic controller (3) and the top of the light phase collection tank (4) through pipelines, and the outlet of the system pressure automatic controller (3) is directly vented. The bottom of the automatic phase separation tank (1) is connected to the liquid discharge valve A (5) and the pressure display B (6) at the same time through pipelines. The tank body of the automatic phase separation tank (1) is arranged from top to bottom in accordance with the pressure display A (2), the pressure display A (3), the pressure display B (6), and the pressure display B (6). The secondary distribution includes: a material inlet (7), a light phase overflow port (8) and a heavy phase production port (9). The material inlet (7) is connected to a phase separation internal component (10) through a pipeline. The phase separation internal component (10) is composed of a feed pipe (1001), an inner overflow trough (1002), an outer overflow trough (1003), a connecting rod (1004) and a drip hole (1005). The inner overflow trough (1002) is concentric with the outer overflow trough (1003). The inner overflow trough (1002) is concentric with the outer overflow trough (1003). ) is provided with drip holes (1005) distributed in an annular manner at the bottom, the outer overflow groove (1003) is connected to the feed pipe (1001) through a connecting rod (1004), the height of the bottom end of the feed pipe (1001) from the bottom end of the inner overflow groove (1002) is h3, the height of the inner overflow groove (1002) is h2, and the height of the outer overflow groove (1003) is h1, and the three satisfy the following relationship: h3 = (0.2-0.4) h2, h2 = (0.3-0.8)h1, the material collides with the bottom of the inner overflow trough (1002) at high speed through the feed pipe (1001) to achieve rapid gas-liquid separation, the gas composition is upward, the light component and the heavy component are separated by liquid-liquid in the inner overflow trough (1002) and the outer overflow trough (1003), the installation height of the phase separation internal component (10) is located within the light phase composition, due to the difference in liquid density, the heavy component will sink through the drip holes (1005) distributed in an annular manner at the bottom of the inner overflow trough (1002), and the light component will overflow from the inner overflow trough (1002) to the outer overflow trough (1003), which will buffer the fluctuation of the light phase liquid level. The light phase overflow port (8) is connected to the light phase collection tank (4) through a pipeline, and the bottom of the light phase collection tank (4) is connected to a drain valve C (1 1), the heavy phase production outlet (9) is connected to the heavy phase production automatic regulating valve (12) and the heavy phase collection tank (13) in sequence through pipelines, the top of the heavy phase collection tank (13) is connected to the pressure display C (14) and the automatic pressure regulator (15) through pipelines, and the bottom of the heavy phase collection tank (13) is connected to the liquid discharge valve B (16) through a pipeline. The pressure display A (2) and the pressure display C (14) are pressure gauges or pressure sensors, and the pressure display B (6) is a pressure sensor. The pressure display B (6) interlocks and controls the opening of the heavy phase production automatic regulating valve (12). The opening of the heavy phase production automatic regulating valve (12) is interlocked and controlled by collecting the electrical signal of the pressure sensor, so as to realize PID regulation, which is more conducive to the stability of the control phase interface.

[0029] In this embodiment, according to the structure of the above self-balancing multiphase self-dividing device, the self-balancing multiphase self-dividing control method is used for separating butanol and water after butanol-water azeotropic distillation, comprising the following steps:

[0030] Step 1: The pressure at the material inlet (7) is recorded as P0, the pressure displayed by the pressure display A (2) is recorded as P1, the pressure displayed by the pressure display B (6) is recorded as P2, the pressure displayed by the pressure display C (14) is recorded as P3, the static pressure difference generated by the liquid between the heavy phase production outlet (9) and the light phase overflow outlet (8) is recorded as ΔP, the pressure P0 at the material inlet (7) is normal pressure, the static pressure difference ΔP generated by the light phase component between the heavy phase production outlet (9) and the light phase overflow outlet (8) is recorded as 0.1 MPa,

[0031] Step 2: Close the drain valve A (5), the heavy phase extraction automatic regulating valve (12) and the drain valve C (11), the material inlet (7) is connected to the reaction system through a pipeline, and the system pressure automatic controller (3) controls the pressure in the automatic phase separation tank (1) and the light phase collection tank (4) to be consistent with the pressure at the material inlet, that is:

[0032] P0=P1=0MPa;

[0033] Step 3: Close the drain valve B (16), and introduce inert gas into the heavy phase collection tank (13) through the automatic pressure regulator (15) to ensure that the pressure P3 displayed on the pressure display C (14) satisfies: P3 = P0 + ΔP = 0.1 MPa;

[0034] Step 4: When the pressure P2 displayed by the pressure display B (6) is 0.5 MPa higher than the pressure P3 displayed by the pressure display C (14), the opening of the heavy phase extraction automatic regulating valve (12) is adjusted so that the difference between P2 and P3 satisfies: 0.05 MPa to 0.2 MPa, and the heavy phase component automatically flows into the heavy phase collection tank (13), and the light phase component automatically flows into the light phase collection tank (4) through the light phase overflow port (8), and the phase interface is controlled to be stable.

[0035] After separation, samples were taken from the light phase collecting tank (4) and the heavy phase collecting tank (13) for analysis. The content of butanol in the light phase component was 99.5%, and the content of butanol in the heavy phase component was 0.05%. It can be seen that the automatic phase separation of butanol and water can be well achieved by using the device and method in this embodiment.

[0036] Embodiment 2:

[0037] The self-balancing multiphase self-dividing device used in this embodiment is the same as that in Example 1, and is used to separate benzene from an ethanol / water mixture after azeotropic distillation of ethanol-water-benzene, comprising the following steps:

[0038] Step 1: The pressure at the material inlet (7) is recorded as P0, the pressure displayed by the pressure display A (2) is recorded as P1, the pressure displayed by the pressure display B (6) is recorded as P2, the pressure displayed by the pressure display C (14) is recorded as P3, the static pressure difference generated by the liquid between the heavy phase production outlet (9) and the light phase overflow outlet (8) is recorded as ΔP, the pressure P0 at the material inlet (7) is recorded as 0.1 MPa, and the static pressure difference ΔP generated by the light phase component between the heavy phase production outlet (9) and the light phase overflow outlet (8) is recorded as 0.05 MPa;

[0039] Step 2: Close the drain valve A (5), the heavy phase extraction automatic regulating valve (12) and the drain valve C (11), the material inlet (7) is connected to the reaction system through a pipeline, and the system pressure automatic controller (3) controls the pressure in the automatic phase separation tank (1) and the light phase collection tank (4) to be consistent with the pressure at the material inlet, that is:

[0040] P0=P1=0.1MPa;

[0041] Step 3: Close the drain valve B (16), and introduce inert gas into the heavy phase collection tank (13) through the automatic pressure regulator (15) to ensure that the pressure P3 displayed on the pressure display C (14) satisfies: P3 = P0 + ΔP = 0.15 MPa;

[0042] Step 4: When the pressure P2 displayed by the pressure display B (6) is 0.6 MPa higher than the pressure P3 displayed by the pressure display C (14), the opening of the heavy phase extraction automatic regulating valve (12) is adjusted so that the difference between P2 and P3 satisfies: 0.05 MPa to 0.2 MPa, and the heavy phase component automatically flows into the heavy phase collection tank (13), and the light phase component automatically flows into the light phase collection tank (4) through the light phase overflow port (8), and the phase interface is controlled to be stable.

[0043] After separation, samples were taken from the light phase collecting tank (4) and the heavy phase collecting tank (13) for analysis. The benzene content in the light phase component was 98.2%, and the ethanol content was 0.5%. The benzene content in the heavy phase component was 0.7%, and the ethanol content was 98.6%. It can be seen that the device and method in this embodiment can well achieve the separation of benzene and ethanol / water mixture after azeotropic distillation of ethanol-water-benzene.

Claims

1. A self-balancing multiphase self-dividing device, comprising an automatic phase separation tank (1), a pressure display A (2), a system pressure automatic controller (3), a light phase collection tank (4), a liquid discharge valve A (5), a pressure display B (6), a material inlet (7), a light phase overflow port (8), a heavy phase production port (9), a phase separation internal component (10), a liquid discharge valve C (11), a heavy phase production automatic regulating valve (12), a heavy phase collection tank (13), a pressure display C (14), an automatic pressure regulator (15) and a liquid discharge valve B (16), characterized in that: The top of the automatic phase separation tank (1) is connected to the pressure display A (2), the inlet of the system pressure automatic controller (3) and the top of the light phase collection tank (4) through pipelines, and the outlet of the system pressure automatic controller (3) is directly vented. The bottom of the automatic phase separation tank (1) is connected to the liquid discharge valve A (5) and the pressure display B (6) through pipelines. The tank body of the automatic phase separation tank (1) is distributed with: a material inlet (7), a light phase overflow port (8) and a heavy phase extraction port (9) from top to bottom. The material inlet (7) is connected to the light phase overflow port (8) and the heavy phase extraction port (9) through pipelines. The light phase overflow port (8) is connected to the light phase collecting tank (4) through a pipeline. The bottom of the light phase collecting tank (4) is connected to a drain valve C (11). The heavy phase production port (9) is connected to a heavy phase production automatic regulating valve (12) and a heavy phase collecting tank (13) in sequence through a pipeline. The top of the heavy phase collecting tank (13) is connected to a pressure display C (14) and an automatic pressure regulator (15) through pipelines, respectively. The bottom of the heavy phase collecting tank (13) is connected to a drain valve B (16) through a pipeline.

2. The self-balancing multiphase self-flow splitting device according to claim 1, characterized in that: The pressure display A (2) and the pressure display C (14) are pressure gauges or pressure sensors, and the pressure display B (6) is a pressure sensor. The pressure display B (6) interlocks and controls the opening of the heavy phase extraction automatic regulating valve (12). By collecting the electrical signal of the pressure sensor to interlock and control the opening of the heavy phase extraction automatic regulating valve (12), PID regulation is realized, which is more conducive to the stability of the control phase interface.

3. The self-balancing multiphase self-flow splitting device according to claim 1, characterized in that: The phase separation internal component (10) is composed of a feed pipe (1001), an inner overflow groove (1002), an outer overflow groove (1003), a connecting rod (1004) and a drip hole (1005). The inner overflow groove (1002) is concentric with the outer overflow groove (1003). The bottom of the inner overflow groove (1002) is provided with drip holes (1005) in an annular pattern. The outer overflow groove (1003) is connected to the feed pipe (1001) via the connecting rod (1004). The height of the bottom end of the feed pipe (1001) from the bottom end of the inner overflow groove (1002) is h3, the height of the inner overflow groove (1002) is h2, and the height of the outer overflow groove (1003) is h1. The three satisfy the following relationship: h 3 = (0.2 ~ 0.4) h2, h2 = (0.3 ~ 0.8) h1, the material collides with the bottom of the inner overflow trough (1002) at high speed through the feed pipe (1001) to achieve rapid gas-liquid separation, the gas composition is upward, the light component and the heavy component are liquid-liquid separated in the inner overflow trough (1002) and the outer overflow trough (1003), the installation height of the phase separation internal component (10) is located within the light phase composition, due to the liquid density difference, the heavy component will sink through the drip holes (1005) distributed in an annular manner at the bottom of the inner overflow trough (1002), and the light component will overflow from the inner overflow trough (1002) to the outer overflow trough (1003), which will buffer the fluctuation of the light phase liquid level.

4. A self-balancing multi-phase self-flow control method, characterized in that: The following steps are involved: Step 1: The pressure at the material inlet (7) is recorded as P0, the pressure displayed by the pressure display A (2) is recorded as P1, the pressure displayed by the pressure display B (6) is recorded as P2, the pressure displayed by the pressure display C (14) is recorded as P3, and the static pressure difference generated by the liquid between the heavy phase extraction port (9) and the light phase overflow port (8) is recorded as ΔP; Step 2: Close the drain valve A (5), the heavy phase extraction automatic regulating valve (12) and the drain valve C (11), connect the material inlet (7) to the reaction system through a pipeline, and adjust the system pressure automatic controller (3) to control the pressure in the automatic phase separation tank (1) and the light phase collection tank (4) to be consistent with the pressure at the material inlet, that is, P0 = P1; Step 2: Close the drain valve B (16), and introduce inert gas into the heavy phase collection tank (13) through the automatic pressure regulator (15) to ensure that the pressure P3 displayed on the pressure display C (14) satisfies: P3 = P0 + ΔP; Step 3: When the pressure P2 displayed on the pressure display B (6) is 0.05MPa to 1.0MPa higher than the pressure P3 displayed on the pressure display C (14), adjust the opening of the heavy phase extraction automatic regulating valve (12) so that P2 and P3 The difference between them satisfies: 0.05MPa~0.2MPa, and the heavy phase component automatically flows into the heavy phase collection tank (13). The light phase component automatically flows into the light phase collection tank (4) through the light phase overflow port (8), and the phase interface is controlled to be stable.

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