Oil-water two-phase interface determination device

Abstract

The utility model belongs to the technical field of chemical devices, and particularly relates to an oil-water two-phase interface determining device which comprises a reaction kettle, a discharging pipe is arranged at the bottom of the reaction kettle, a ball valve, a detection assembly, a sight glass and a control valve are sequentially arranged on the discharging pipe, a conductivity probe and a pH meter probe are arranged on the detection assembly, an electrode detection head is arranged on the conductivity probe, and a water inlet is formed in the pH meter probe. One end, close to the electrode detection head, of the conductivity probe is horizontally arranged in the detection assembly, an induction detection head is arranged on the pH meter probe, one end, close to the induction detection head, of the pH meter probe is upwards obliquely arranged in the detection assembly, the conductivity probe and the pH meter probe are electrically connected with the control valve, a first positioning key is arranged on the conductivity probe, and a second positioning key is arranged on the pH meter probe. According to the device, the problem that a single electric signal is interfered by temperature, impurities and emulsion can be solved, and rapid and accurate detection of an oil-water interface is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical devices, and particularly relates to a device for determining the oil-water two-phase interface. Background Art

[0002] In the production process of organic peroxides, the liquid material after the reaction needs to be subjected to mother liquor separation and washing purification in sequence, and both of these two processes are completed in the reaction kettle. After the reaction kettle stops stirring, the oil phase and the water phase are stratified under the action of gravity due to density differences. The upper layer is the oil-phase product, and the lower layer is the water-phase mother liquor. The traditional separation method relies on the operator to observe the water-phase discharge situation through the sight glass, and manually control the valve to stop draining water when the oil-water interface appears in the sight glass. However, since the colors and states of the oil phase and the water phase are similar, it is difficult for the naked eye to quickly and accurately distinguish the interface, resulting in low separation efficiency, large operation fluctuations, and risks such as product misdischarge and safety accidents caused by human misjudgment. In addition, the differences in experience and senses of different operators further exacerbate the instability of the separation process. The residual water phase will also reduce the subsequent washing efficiency, increasing the production time and cost.

[0003] Chinese Patent CN222724309 discloses an automatic oil-water separation combined device, which includes a reaction kettle, a water receiving tank, and an oil receiving tank. A bottom valve of the kettle and an oil-water interface detector are sequentially installed on the liquid outlet pipe at the bottom of the reaction kettle. The end of the liquid outlet pipe is connected to the water receiving tank through a first liquid separation pipe and to the oil receiving tank through a second liquid separation pipe. A first cut-off valve is installed on the first liquid separation pipe, and a second cut-off valve is installed on the second liquid separation pipe. The oil-water interface detector, the bottom valve of the kettle, the first cut-off valve, and the second cut-off valve are all connected to a microprocessor. This patent can effectively reduce material loss and improve production efficiency during use, without the need for on-site separation by staff, and is safer and more reliable. However, the oil-water interface detector of this patent only uses the difference in the absorption of electric energy by the oil phase and the water phase to detect the oil-water two-phase interface. When the system temperature changes, resulting in changes in the conductivity and dielectric constant of the oil phase and the water phase, or when trace impurity ions in the material change the conductive characteristics of the solution, the electrical signal detected by the oil-water interface detector will shift; at the same time, since the electrical characteristics of the water-in-oil or oil-in-water emulsion are between those of the oil phase and the water phase, it is difficult for the detector to accurately identify the gradual interface, often resulting in a delay in valve switching; in addition, the performance of the sensor surface of the oil-water interface detector will decay due to fouling or material adhesion, there is a risk of misopening the valve and directly discharging the oil-phase product into the wastewater system. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a device for determining the oil-water two-phase interface, which can solve the problem that a single electrical signal is interfered by temperature, impurities, and emulsion, accurately identify the oil-water two-phase interface, and at the same time avoid misjudgment caused by the attenuation of the sensor performance, realizing rapid and accurate detection of the oil-water interface.

[0005] To achieve the above object, the technical solution of the present utility model is as follows:

[0006] An oil-water two-phase interface determination device includes a reaction kettle. An outlet pipe is provided at the bottom of the reaction kettle. A ball valve, a detection assembly, a sight glass and a control valve are sequentially arranged on the outlet pipe. A conductivity probe and a pH meter probe are arranged on the detection assembly. An electrode detection head is arranged on the conductivity probe. One end of the conductivity probe close to the electrode detection head is horizontally arranged inside the detection assembly. An induction detection head is arranged on the pH meter probe. One end of the pH meter probe close to the induction detection head is upwardly inclined and arranged inside the detection assembly. Both the conductivity probe and the pH meter probe are electrically connected to the control valve. A positioning key one is arranged on the conductivity probe, and a positioning key two is arranged on the pH meter probe.

[0007] Wherein:

[0008] The detection assembly is integrally arranged in a circular tube shape, and the diameter of the detection assembly is equal to the diameter of the outlet pipe.

[0009] The detection assembly is provided with a sealing seat one in cooperation with the conductivity probe.

[0010] A guiding groove one is arranged inside the sealing seat one in cooperation with the positioning key one.

[0011] A sleeve one is arranged outside the sealing seat one in cooperation with the conductivity probe, and a sealing ring is arranged between the sleeve one and the conductivity probe.

[0012] The detection assembly is provided with a sealing seat two in cooperation with the pH meter probe.

[0013] A guiding groove two is arranged inside the sealing seat two in cooperation with the positioning key two.

[0014] A sleeve two is arranged outside the sealing seat two in cooperation with the pH meter probe, and a sealing ring is arranged between the sleeve two and the pH meter probe.

[0015] A water inlet is arranged in cooperation with the electrode detection head.

[0016] The included angle between the pH meter probe and the horizontal plane is between 15° and 30°.

[0017] The beneficial effects of the present utility model are as follows:

[0018] A dual detection signal is formed by the conductivity probe and the pH probe. Compared with the single electrical signal detection, it solves the problem of detection deviation caused by temperature change, impurity ion interference or emulsion influence in the prior art. The conductivity probe and the pH probe can timely close the control valve, reduce the operation fluctuation of manual observation, and improve the operation stability. The positioning key one and the positioning key two respectively guide the conductivity probe and the pH probe to insert into the detection component, which can realize the rapid positioning and installation of the conductivity probe and the pH probe in the detection component, ensure the calibration accuracy, and improve the disassembly and assembly efficiency of the conductivity probe and the pH probe. When the detection of the conductivity probe and the pH probe is abnormal due to scaling or adhering materials, the recognition ability of the oil-water two-phase interface can be quickly restored through rapid replacement. Description of the Drawings

[0019] Figure 1 It is a structural schematic diagram of the present utility model;

[0020] Figure 2 It is a partial structural schematic diagram of the detection component, conductivity probe, pH probe, seal seat one, sleeve one, seal seat two and sleeve two of the present utility model;

[0021] Figure 3 It is an exploded schematic diagram of the seal seat one, guide groove one and sleeve one of the present utility model;

[0022] Figure 4 It is an exploded schematic diagram of the seal seat two, guide groove two and sleeve two of the present utility model;

[0023] Figure 5 It is a partial structural schematic diagram of the conductivity probe, positioning key one and water inlet of the present utility model;

[0024] Figure 6 It is a partial structural schematic diagram of the pH probe and positioning key two of the present utility model;

[0025] Figure 7 It is a partial structural schematic diagram of the conductivity probe, positioning key one, water inlet, seal seat one and sleeve one of the present utility model;

[0026] Figure 8 It is a partial structural schematic diagram of the pH probe, seal seat two and sleeve two of the present utility model;

[0027] In the figure:

[0028] 1, reaction kettle; 2, discharge pipe; 3, ball valve; 4, detection component; 5, sight glass; 6, control valve; 7, conductivity probe; 8, pH probe; 9, positioning key one; 10, positioning key two; 11, seal seat one; 12, guide groove one; 13, sleeve one; 14, seal seat two; 15, guide groove two; 16, sleeve two; 17, water inlet. Specific Embodiments

[0029] The present utility model will be specifically described and illustrated below in conjunction with embodiments.

[0030] Embodiment 1

[0031] As Figure 1-8 shown, the oil-water two-phase interface determination device includes a reaction kettle 1. A discharge pipe 2 is provided at the bottom of the reaction kettle 1. A ball valve 3, a detection component 4, a sight glass 5 and a control valve 6 are sequentially arranged on the discharge pipe 2. A conductivity probe 7 and a pH probe 8 are arranged on the detection component 4. An electrode detection head is arranged on the conductivity probe 7. One end of the conductivity probe 7 close to the electrode detection head is horizontally arranged inside the detection component 4. An induction probe head is arranged on the pH probe 8. One end of the pH probe 8 close to the induction probe head is obliquely upward arranged inside the detection component 4. Both the conductivity probe 7 and the pH probe 8 are electrically connected to the control valve 6. A positioning key one 9 is arranged on the conductivity probe 7. A positioning key two 10 is arranged on the pH probe 8.

[0032] The conductivity probe 7 identifies the oil-water two-phase interface by using the difference in the conductivity of the oil-water two phases. The aqueous phase contains more ionic impurities and has a high conductivity. The conductivity probe 7 forms a strong electrical signal through ionic conduction. The ionic content in the oil phase is extremely low and the conductivity is close to zero. The conductivity probe 7 forms a weak electrical signal through ionic conduction. When the conductivity suddenly drops from a high value to a low value, it is determined that the oil-water two-phase interface has been reached.

[0033] The pH probe 8 identifies the oil-water two-phase interface by using the difference in the acidity and alkalinity of the oil-water two phases. More acid-base impurities are dissolved in the aqueous phase, and the pH value is acidic or alkaline. The oil phase is neutral and the pH value is close to 7. When the pH value suddenly changes from a non-neutral range to a neutral range, it is determined that the oil-water two-phase interface has been reached.

[0034] The conductivity probe 7 and the pH probe 8 synchronously monitor the conductivity and acidity and alkalinity of the material, solve the problem that a single electrical signal is interfered by temperature, impurities and emulsion, and avoid misjudgment of the interface caused by signal distortion; both the conductivity probe 7 and the pH probe 8 are electrically connected to the control valve 6, and can automatically trigger the control valve 6 to close, reducing operation fluctuations caused by differences in the experience of staff.

[0035] The detection component 4 is integrally arranged in a circular tube shape, and the diameter of the detection component 4 is equal to the diameter of the discharge pipe 2. Ensure that the material flows evenly inside the detection component 4, eliminate sudden changes in flow velocity and turbulence caused by diameter changes, avoid signal fluctuations caused by changes in the flow velocity of the material, and make the detection of the conductivity probe 7 and the pH probe 8 more stable.

[0036] The detection component 4 is provided with a sealing seat one 11 in cooperation with the conductivity probe 7.

[0037] Inside the first sealing seat 11, a guiding groove 12 is provided in cooperation with the first positioning key 9.

[0038] Outside the first sealing seat 11, a sleeve 13 is provided in cooperation with the conductivity probe 7. A sealing ring is provided between the sleeve 13 and the conductivity probe 7.

[0039] The guiding groove 12 inside the first sealing seat 11 cooperates with the first positioning key 9 to ensure that the conductivity probe 7 can be quickly inserted into the detection assembly 4 without additional centering adjustment; the first sealing seat 11 and the sleeve 13 are provided with a sealing ring in cooperation to form a reliable sealing structure to avoid the risk of material leakage.

[0040] A second sealing seat 14 is provided in cooperation with the pH probe 8 for the detection assembly 4.

[0041] Inside the second sealing seat 14, a guiding groove 15 is provided in cooperation with the second positioning key 10.

[0042] Outside the second sealing seat 14, a sleeve 16 is provided in cooperation with the pH probe 8. A sealing ring is provided between the sleeve 16 and the pH probe 8.

[0043] The guiding groove 15 inside the second sealing seat 14 cooperates with the second positioning key 10 to ensure that the pH probe 8 can be quickly inserted into the detection assembly 4 without additional centering adjustment; the second sealing seat 14 and the sleeve 16 are provided with a sealing ring in cooperation to form a reliable sealing structure to avoid the risk of material leakage.

[0044] A water inlet 17 is provided in cooperation with the electrode detection head. The water inlet 17 faces the direction of material flow and can guide the water phase or oil phase to pass through the electrode surface at a stable flow rate, enabling the conductivity probe 7 to more sensitively capture the inflection point of the conductivity mutation.

[0045] The included angle between the pH probe 8 and the horizontal plane is between 15° and 30°. The inclination angle of 15° - 30° increases the contact area between the sensing head of the pH probe 8 and the material, improving the response sensitivity of the pH probe 8.

Claims

1. A device for determining an oil-water two-phase interface, comprising a reactor (1), wherein a discharge pipe (2) is provided at the bottom of the reactor (1), and wherein: The discharge pipe (2) is provided with a ball valve (3), a detection assembly (4), a sight glass (5) and a control valve (6) in sequence; the detection assembly (4) is provided with a conductivity probe (7) and a pH meter probe (8); the conductivity probe (7) is provided with an electrode detection head; the end of the conductivity probe (7) close to the electrode detection head is horizontally arranged inside the detection assembly (4); the pH meter probe (8) is provided with an induction probe; the end of the pH meter probe (8) close to the induction probe is tilted upwards and arranged inside the detection assembly (4); the conductivity probe (7) and the pH meter probe (8) are both electrically connected to the control valve (6); the conductivity probe (7) is provided with a first positioning key (9); and the pH meter probe (8) is provided with a second positioning key (10).

2. The oil-water two-phase interface determination device according to claim 1, characterized in that: The detection component (4) is arranged in a circular tube shape as a whole, and the diameter of the detection component (4) is equal to the diameter of the discharge pipe (2).

3. The oil-water two-phase interface determination device according to claim 2, characterized in that: The detection component (4) is provided with a sealing seat (11) in cooperation with the conductivity probe (7).

4. The oil-water two-phase interface determination device according to claim 3, characterized in that: A guide groove (12) is provided inside the sealing seat (11) to cooperate with the positioning key (9).

5. The oil-water two-phase interface determination device according to claim 4, characterized in that: The outside of the sealing seat 1 (11) is provided with a sleeve 1 (13) in cooperation with the conductivity probe (7), and a sealing ring is provided between the sleeve 1 (13) and the conductivity probe (7).

6. The oil-water two-phase interface determination device according to claim 2, characterized in that: The detection component (4) is provided with a second sealing seat (14) in cooperation with the pH meter probe (8).

7. The oil-water two-phase interface determination device according to claim 6, characterized in that: The second sealing seat (14) is internally provided with a second guide groove (15) to cooperate with the second positioning key (10).

8. The oil-water two-phase interface determination device according to claim 7, characterized in that: The second sealing seat (14) is provided with a second sleeve (16) on the outside thereof in cooperation with the pH meter probe (8), and a sealing ring is provided between the second sleeve (16) and the pH meter probe (8).

9. The oil-water two-phase interface determination device according to claim 1, characterized in that: The electrode detection head is cooperatively provided with a water inlet (17).

10. The oil-water two-phase interface determination device according to claim 1, characterized in that: The angle between the pH meter probe (8) and the horizontal plane is between 15 and 30 degrees.

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