Liquid-liquid extraction device

Abstract

The utility model provides a liquid-liquid extraction device, which belongs to the field of extraction processing and comprises a material intermediate tank, an extraction tower, a material receiving tank, a first extraction agent receiving tank, a to-be-evaporated extraction agent receiving tank, an extraction agent evaporator and a second extraction agent receiving tank, the extraction tower comprises a tower top settling section, a heavy-phase tower-entering distributor, a filler section, a light-phase tower-entering distributor and a tower bottom settling section, the to-be-evaporated extraction agent receiving tank is communicated with the tower top settling section, the material intermediate tank is communicated with the heavy-phase tower-entering distributor, the material receiving tank is communicated with the tower bottom settling section, and the light-phase tower-entering distributor is communicated with the filler section. A liquid level high-limit alarm and a heavy phase extraction valve are arranged between the tower bottom settling section and the material receiving tank, the high-limit alarm is in follow-up connection with the heavy phase extraction valve, the material intermediate tank and the first extraction agent receiving tank, and the liquid level high-limit alarm is in follow-up connection with the material intermediate tank, the first extraction agent receiving tank and the heavy phase extraction valve. Compared with the prior art, the technical problem that an existing extraction device is insufficient in automation degree is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of extraction, more specifically, relate to a liquid-liquid extraction device. BACKGROUND

[0002] Liquid-liquid extraction is often used for the separation of measured substances and matrix in samples, and the purpose of purification and elimination of interfering substances is achieved by separating samples through distribution between two incompatible liquids or phases. In most cases, one liquid phase is an aqueous solvent, and the other liquid phase is an organic solvent. The selectivity and separation efficiency of the extraction process can be controlled by selecting two incompatible liquids. In water and organic phase, the stronger the hydrophilicity of hydrophilic compounds, the greater the degree of hydrophobic compounds entering the organic phase. Generally, analytical chemists first separate the measured substances of interest in organic solvents, and then, due to the high vapor pressure of commonly used solvents, the solvents can be removed by evaporation to concentrate the measured substances. The existing traditional kettle type liquid-liquid extraction device has the operation mode of manually adding extraction substances and extractant, and after a certain time of stirring and standing, personnel determine the discharge intermediate boundary through pipeline sight glasses, the processing process is complicated, the processing capacity is small, the quality risk is large, and the labor intensity of personnel is large. SUMMARY

[0003] The utility model aims at providing a liquid-liquid extraction device to solve the technical problem of insufficient automation of the existing extraction device.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a liquid-liquid extraction device, which comprises a material intermediate tank, an extraction tower, a material receiving tank, a first extractant receiving tank, a to-be-evaporated extractant receiving tank, an extractant evaporator and a second extractant receiving tank:

[0005] Among them, the extraction tower comprises a tower top settling section, a heavy phase into tower distributor, a filler section, a light phase into tower distributor and a tower bottom settling section arranged in sequence from top to bottom, the to-be-evaporated extractant receiving tank is communicated with the tower top settling section, the material intermediate tank is communicated with the heavy phase into tower distributor, the material receiving tank is communicated with the tower bottom settling section, a liquid level high limit alarm and a heavy phase production valve are arranged between the tower bottom settling section and the material receiving tank, the high limit alarm is connected with the heavy phase production valve, the material intermediate tank and the first extractant receiving tank, the first extractant receiving tank is communicated with the light phase into tower distributor, and a densimeter and a density alarm are arranged between the first extractant receiving tank and the light phase into tower distributor, the liquid level high limit alarm is connected with the material intermediate tank, the first extractant receiving tank and the heavy phase production valve, the middle part of the extractant evaporator is connected with the to-be-evaporated extractant receiving tank, the top end is connected with the second extractant receiving tank, and the bottom end is connected with the first extractant receiving tank.

[0006] In a possible implementation, the liquid-liquid extraction device further comprises a first transfer pump arranged between the intermediate material tank and the extraction column, the first transfer pump is arranged as a low liquid level stop pump, and the first transfer pump is configured to pump the material in the intermediate material tank to the extraction column, the outlet of the intermediate material tank is provided with a first flow valve, and the low liquid level stop pump and the first flow valve are connected with the high liquid level alarm and the density alarm.

[0007] In a possible implementation, the liquid-liquid extraction device further comprises a second transfer pump arranged between the extraction column and the first extractant receiving tank, the second transfer pump is configured to pump the extractant in the first extractant receiving tank to the extraction column, and the second transfer pump is connected with the high liquid level alarm and the density alarm.

[0008] In a possible implementation, the liquid-liquid extraction device further comprises a third transfer pump arranged between the to-be-vaporized extractant receiving tank and the extractant evaporator, the third transfer pump is configured to pump the to-be-vaporized extractant in the to-be-vaporized extractant receiving tank to the extractant evaporator, and the third transfer pump is connected with the high liquid level alarm and the density alarm.

[0009] In a possible implementation, the first extractant receiving tank and the to-be-vaporized extractant receiving tank are arranged below the extractant evaporator.

[0010] In a possible implementation, the material receiving tank is arranged below the extraction column.

[0011] In a possible implementation, the liquid-liquid extraction device further comprises a condenser arranged between the extractant evaporator and the second extractant receiving tank.

[0012] In a possible implementation, the second extractant receiving tank is arranged above the first extractant receiving tank, and the second extractant receiving tank is in communication with the first extractant receiving tank.

[0013] Compared with the prior art, the liquid-liquid extraction device has the following advantages:

[0014] First, the material intermediate tank is used for storing the material to be extracted, the material receiving tank is used for storing the extracted material, the material to be extracted enters from the top of the extraction tower, the extraction liquid enters from the position lower than the middle of the extraction tower, the physical reaction is carried out in the extraction tower, the extraction liquid in the gas state flows to the receiving tank of the to-be-vaporized extraction agent after extracting the material, the extracted material is deposited downwards and enters the material receiving tank below the extraction tower, the receiving tank of the to-be-vaporized extraction agent can discharge the extraction liquid mixed with impurities to the extraction agent evaporator, the extraction agent evaporator purifies the extraction liquid in the evaporative condensation mode, and the condensed extraction liquid enters the first extraction agent receiving tank or the second extraction agent receiving tank, so that the extraction agent is reused, not only that, but also the liquid level high limit alarm can be used to control the opening and closing of the heavy phase production valve, and the opening and closing of the material receiving tank and the first extraction agent receiving tank are controlled, so as to prevent the material in the material receiving tank from being overfilled, meanwhile, the density meter and the density alarm can be used to control the opening and closing of the material intermediate tank, the first extraction agent receiving tank and the material receiving tank, so that the utility model can automatically stop working when the liquid level of the material receiving tank is high, and can automatically start working when the material in the material intermediate tank is finished, thereby improving the automation degree of the utility model, and solving the technical problem of the inconvenient feeding process of the existing liquid-liquid extraction device. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating laboriously.In the drawings:

[0016] Figure 1 The overall structure schematic diagram of the liquid-liquid extraction device provided by the utility model.

[0017] In the drawings:

[0018] 1, material intermediate tank;2, first conveying pump;3, extraction tower;4, material receiving tank;5, first extraction agent receiving tank;6, to-be-vaporized extraction agent receiving tank;7, third conveying pump;8, extraction agent evaporator;9, condenser;10, second extraction agent receiving tank;11, second conveying pump. DETAILED DESCRIPTION

[0019] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0020] In the description of the utility model, it is necessary to explain, if appearing "upper", "lower", "inner", "back" and so on indicating orientation or positional relation term, it is based on the orientation or positional relation shown in drawing, only for the convenience of describing the utility model and simplifying the description, and is not indicating or implying that the device or element must have a specific orientation, a specific orientation structure and operation, therefore cannot be understood as the limitation of the utility model.

[0021] In addition, in the description of the utility model, unless otherwise expressly limited, the terms "mounting", "connecting", "connection", "connector" should be broadly understood.For example, the connection can be fixed connection, or detachable connection, or integrally connected, can be mechanical connection, or electrical connection, can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances.

[0022] In order to make the technical problems, technical schemes and beneficial effects of the utility model to be solved more clear and obvious, the utility model will be further described in detail below in combination with the drawings and examples.It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0023] Please refer to Figure 1 The liquid-liquid extraction device provided by the utility model will be described now.The liquid-liquid extraction device comprises a material intermediate tank 1, an extraction tower 3, a material receiving tank 4, a first extractant receiving tank 5, a to-be-evaporated extractant receiving tank 6, an extractant evaporator 8 and a second extractant receiving tank 10.

[0024] The extraction tower 3 comprises a tower top settling section, a heavy phase tower inlet distributor, a filler section, a light phase tower inlet distributor and a tower bottom settling section arranged in sequence from top to bottom, the to-be-evaporated extractant receiving tank 6 is communicated with the tower top settling section, the material intermediate tank 1 is communicated with the heavy phase tower inlet distributor, the material receiving tank 4 is communicated with the tower bottom settling section, a liquid level high limit alarm and a heavy phase extraction valve are arranged between the tower bottom settling section and the material receiving tank 4, the high limit alarm is connected with the heavy phase extraction valve, the material intermediate tank 1 and the first extractant receiving tank 5, the first extractant receiving tank 5 is communicated with the light phase tower inlet distributor, and a densimeter and a density alarm are arranged between the first extractant receiving tank 5 and the light phase tower inlet distributor, the liquid level high limit alarm is connected with the material intermediate tank 1, the first extractant receiving tank 5 and the heavy phase extraction valve, the middle part of the extractant evaporator 8 is connected with the to-be-evaporated extractant receiving tank 6, the top end is connected with the second extractant receiving tank 10, and the bottom end is connected with the first extractant receiving tank 5.

[0025] Compared with the prior art, in the specific use process, the material intermediate tank 1 is used for storing the material to be extracted, the material receiving tank 4 is used for storing the extracted material, the material to be extracted enters from the top of the extraction tower 3, the extraction liquid enters from a position lower than the middle of the extraction tower 3, physical reaction is carried out in the extraction tower 3, the extraction liquid in the gas state flows to the to-be-vaporized extraction agent receiving tank 6 from the top of the extraction tower 3 after extracting the material, the extracted material is precipitated downward and enters the material receiving tank 4 located below the extraction tower 3, the to-be-vaporized extraction agent receiving tank 6 can discharge the extraction liquid mixed with impurities to the extraction agent evaporator 8, the extraction agent evaporator 8 purifies the extraction liquid in the form of evaporation and condensation, and the condensed extraction liquid enters the first extraction agent receiving tank 5 or the second extraction agent receiving tank 10, so that the extraction agent is reused, not only that, but also the liquid level high limit alarm can be used to control the opening and closing of the heavy phase production valve, and the opening and closing of the material receiving tank 4 and the first extraction agent receiving tank 5 are controlled, so that the material in the material receiving tank 4 is prevented from being overfilled, meanwhile, the density meter and the density alarm can be used to control the opening and closing of the material intermediate tank 1, the first extraction agent receiving tank 5 and the material receiving tank 4, so that the utility model can automatically stop working when the liquid level of the material receiving tank 4 is high, and can automatically start working when the material intermediate tank 1 has material after the material receiving tank 4 is discharged, the automation degree of the utility model is improved, and thus the technical problem of the inconvenient feeding process of the existing liquid-liquid extraction device is solved.

[0026] Based on the above embodiment, a feasible implementation manner is proposed. The liquid-liquid extraction device further comprises a first conveying pump 2, which is arranged between the material intermediate tank 1 and the extraction tower 3. The first conveying pump 2 is arranged to be low-liquid-level stop pumping. The first conveying pump 2 is used to pump the material in the material intermediate tank 1 to the extraction tower 3. The outlet of the material intermediate tank 1 is provided with a first flow valve. The low-liquid-level stop pumping and the first flow valve are connected with the high-liquid-level alarm and the density alarm. Similarly, the liquid-liquid extraction device further comprises a second conveying pump 11 and a third conveying pump 7. The second conveying pump 11 is arranged between the extraction tower 3 and the first extractant receiving tank 5. The second conveying pump 11 is used to pump the extractant in the first extractant receiving tank 5 to the extraction tower 3. The second conveying pump 11 is connected with the high-liquid-level alarm and the density alarm. The third conveying pump 7 is arranged between the to-be-evaporated extractant receiving tank 6 and the extractant evaporator 8. The third conveying pump 7 can pump the to-be-evaporated extractant in the to-be-evaporated extractant receiving tank 6 to the extractant evaporator 8. The third conveying pump 7 is connected with the high-liquid-level alarm and the density alarm. As arranged above, each conveying pump can cooperate with the density alarm and the high-liquid-level alarm to automatically determine that the liquid levels of the to-be-extracted material tank, the extractant tank and the qualified material receiving tank 4 and the states of the related pipeline valves and the states of the self-control equipment (the states of the self-control valves and the pumps are in the automatic state) are normal. The DCS automatically operates according to the programmed related set values. That is, the operation is automatically started when there is material. The operation is automatically stopped when there is no material or the liquid levels of the extractant tank and the qualified material receiving tank 4 are relatively high. The operation is automatically restarted after being normal. The system automatically determines the conditions as follows: the liquid level of the to-be-extracted material receiving tank 4 is higher than a certain value, the liquid levels of the extractant tank and the qualified material receiving tank 4 are lower than a certain value, and the operation starting program is automatically run. According to the operation progress, the liquid level of the to-be-extracted material receiving tank 4 is lower than a certain value or the liquid levels of the extractant tank and the qualified material receiving tank 4 are higher than a certain value, and the operation stopping program is automatically run. The density of the extractant tank is automatically detected. When the density limit value is reached, the alarm and the interlocking stop device are operated. When the liquid level is high or the pump operation state is abnormal, the program is stopped to run, and the equipment is restored to the stop state, so as to improve the automation degree of the entire liquid-liquid extraction device.

[0027] Based on the above embodiment, further, the first extractant receiving tank 5 and the to-be-evaporated extractant receiving tank 6 are arranged below the extractant evaporator 8, and the material receiving tank 4 is arranged below the extraction tower 3. In this way, the positional relationship of each tank is more reasonable, and the flow of fluid or gas between each component is more energy-saving.

[0028] Based on the above embodiment, in a more preferred implementation manner, in order to improve the circulation speed of the extractant, the liquid-liquid extraction device further comprises a condenser 9 arranged between the extractant evaporator 8 and the second extractant receiving tank 10. The condenser 9 is used to improve the condensation and purification efficiency of the extractant, so that the extractant can more efficiently participate in the extraction process of the extraction tower 3.

[0029] Based on the above embodiment, a feasible implementation is proposed, specifically, the second extractant receiving tank 10 is located above the first extractant receiving tank 5, and the second extractant receiving tank 10 is communicated with the first extractant receiving tank 5.

[0030] In summary, the utility model still can control the opening and closing of the heavy phase production valve through the liquid level high limit alarm, and control the opening and closing of the material receiving tank 4 and the first extractant receiving tank 5, prevent the material in the material receiving tank 4 from overrunning, simultaneously, the utility model still can control the opening and closing of the material intermediate tank 1, the first extractant receiving tank 5 and the material receiving tank 4 through the density meter and the density alarm, and then make the utility model can automatically stop working when the liquid level of the material receiving tank 4 is high, and can automatically start working when the material intermediate tank 1 has material after the material receiving tank 4 finishes discharging, improve the automation degree of the utility model, thereby solve the technical problem that the existing liquid-liquid extraction device is inconvenient to load.

[0031] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A liquid-liquid extraction device, characterized by, The liquid-liquid extraction device comprises a material intermediate tank (1), an extraction column (3), a material receiving tank (4), a first extractant receiving tank (5), a to-be-evaporated extractant receiving tank (6), an extractant evaporator (8) and a second extractant receiving tank (10). The extraction column (3) comprises, from top to bottom, a column top settling section, a heavy phase inlet distributor, a packing section, a light phase inlet distributor and a column bottom settling section, the to-be-evaporated extractant receiving tank (6) is communicated with the column top settling section, the material intermediate tank (1) is communicated with the heavy phase inlet distributor, the material receiving tank (4) is communicated with the column bottom settling section, a liquid level high limit alarm and a heavy phase outlet valve are arranged between the column bottom settling section and the material receiving tank (4), the high limit alarm is connected with the heavy phase outlet valve, the material intermediate tank (1) and the first extractant receiving tank (5), the first extractant receiving tank (5) is communicated with the light phase inlet distributor, a density meter and a density alarm are arranged between the first extractant receiving tank (5) and the light phase inlet distributor, the liquid level high limit alarm is connected with the material intermediate tank (1), the first extractant receiving tank (5) and the heavy phase outlet valve, the middle part of the extractant evaporator (8) is connected with the to-be-evaporated extractant receiving tank (6), the top end is connected with the second extractant receiving tank (10), and the bottom end is connected with the first extractant receiving tank (5).

2. The liquid-liquid extraction device of claim 1, wherein, The liquid-liquid extraction device further comprises a first conveying pump (2) arranged between the material intermediate tank (1) and the extraction column (3), the first conveying pump (2) is arranged to stop pumping at a low liquid level, and the first conveying pump (2) is used to pump the material in the material intermediate tank (1) to the extraction column (3), the outlet of the material intermediate tank (1) is provided with a first flow valve, and the low liquid level stop pumping and the first flow valve are connected with the liquid level high limit alarm and the density alarm.

3. The liquid-liquid extraction device of claim 1, wherein, The liquid-liquid extraction device further comprises a second conveying pump (11) arranged between the extraction column (3) and the first extractant receiving tank (5), the second conveying pump (11) is used to pump the extractant in the first extractant receiving tank (5) to the extraction column (3), and the second conveying pump (11) is connected with the liquid level high limit alarm and the density alarm.

4. The liquid-liquid extraction device of claim 1, wherein, The liquid-liquid extraction device further comprises a third conveying pump (7) arranged between the to-be-evaporated extractant receiving tank (6) and the extractant evaporator (8), the third conveying pump (7) can pump the to-be-evaporated extractant in the to-be-evaporated extractant receiving tank (6) to the extractant evaporator (8), and the third conveying pump (7) is connected with the liquid level high limit alarm and the density alarm.

5. The liquid-liquid extraction device of claim 1, wherein, The first extractant receiving tank (5) and the to-be-evaporated extractant receiving tank (6) are arranged below the extractant evaporator (8).

6. The liquid-liquid extraction device of claim 1, wherein, The material receiving tank (4) is arranged below the extraction column (3).

7. The liquid-liquid extraction device of claim 1, wherein, The liquid-liquid extraction apparatus further comprises a condenser (9) arranged between the extractant evaporator (8) and the second extractant receiving tank (10).

8. The liquid-liquid extraction device of claim 1, wherein, The second extractant receiving tank (10) is located above the first extractant receiving tank (5) and is in communication with the first extractant receiving tank (5).

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