Device for separating n-hexane by liquid-liquid extraction

Abstract

The utility model relates to a device for separating n-hexane by liquid-liquid extraction, which is characterized in that when the device is used, an upper extraction bin is used for receiving raw materials and extraction agents, an upper stirring paddle is used for realizing first stirring extraction operation, and after the first stirring extraction is finished, an extraction phase upper suction pipe and external suction equipment are used for sucking an extraction phase; then extracting the raffinate phase in the upper extraction bin into the lower extraction bin by utilizing a raffinate phase suction pipe and a suction pump, adding the extraction agent into the lower extraction bin again, carrying out second stirring extraction operation under the action of a lower stirring paddle, sucking the raffinate phase by utilizing an extraction phase lower suction pipe and external suction equipment after the second stirring extraction operation is completed, and then opening a discharge valve to discharge the raffinate phase. And discharging the raffinate phase for analysis. In the whole process, a worker does not need to transfer the raffinate phase, and the problem that the operation of the existing liquid-liquid extraction equilibrium kettle is troublesome is solved, so that the separation efficiency of the n-hexane is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a device for separating normal hexane by liquid-liquid extraction. Background Art

[0002] n-Hexane is mainly used as a solvent in industry and has a wide range of applications. It can be used to prepare viscose to bond shoes, leather, and bags. It is often used in wiping and cleaning operations in the production process of the electronic information industry, crude oil extraction in the food manufacturing industry, propylene solvent recovery in the plastics manufacturing industry, extraction agent in chemical experiments, and floral solvent extraction in the production of daily chemicals.

[0003] In the process of producing some chemical products, a mixed solvent of n-hexane and other organic substances is often produced, and a liquid-liquid extraction separation device is required to recover n-hexane. CN 111960914 A discloses a liquid-liquid extraction equilibrium kettle, which is composed of an extraction tank, a water outlet, a water inlet, an upper layer sampling port, a stirrer, a lower layer sampling port, a thermometer sleeve and a water bath jacket, wherein the water outlet is arranged at the top of one side of the water bath jacket, the water inlet is arranged at the bottom of the other side of the water bath jacket, the extraction tank is arranged in the water bath jacket, the upper layer sampling port is arranged at the middle upper part of one side of the extraction tank, the lower layer sampling port is arranged at the bottom of the other side of the extraction tank, the blade of the stirrer is inserted from the top of the extraction tank to the bottom of the extraction tank, one end of the thermometer sleeve is inserted from the top of one side of the extraction tank into the extraction tank, and the other end of the thermometer sleeve passes through the water bath jacket and extends to the outside of the water bath jacket. When in use, a mixed solution containing n-hexane is placed in the extraction tank of a liquid-liquid equilibrium kettle, a constant temperature water bath is set, an extractant is added, a stirrer is operated, and the mixture is allowed to stand after sufficient stirring to separate the raffinate phase from the extraction phase. After the raffinate phase is weighed, it is continued to be added to the extraction tank of the cleaned and dried liquid-liquid equilibrium kettle, and stirred after adding the extractant pure water, and allowed to stand after sufficient stirring to separate the raffinate phase from the extraction phase. In this way, a raffinate phase containing a high content of n-hexane can be obtained, achieving the purpose of extracting and separating n-hexane, but there is a problem of troublesome operation during use. Utility Model Content

[0004] The utility model aims to provide a device for separating n-hexane by liquid-liquid extraction with reasonable structure and reliable use, so as to solve the problem of troublesome operation of the existing liquid-liquid extraction equilibrium kettle and improve the n-hexane separation efficiency.

[0005] The technical solution of the utility model is:

[0006] A device for separating normal hexane by liquid-liquid extraction comprises a shell, an extraction tank and a stirring mechanism, and its technical key points are: the extraction tank comprises an upper extraction chamber and a lower extraction chamber arranged in the shell, a support platform is arranged at the bottom center of the upper extraction chamber, a cover plate covering the upper extraction chamber is arranged on the top of the shell, the stirring mechanism comprises a motor fixed on the cover plate, a stirring vertical shaft whose upper end is connected to the motor and whose lower end passes through the support platform to reach the lower extraction chamber, an upper stirring paddle and a lower stirring paddle arranged on the stirring vertical shaft, the upper stirring paddle is located in the upper extraction chamber, the lower stirring paddle is located in the lower extraction chamber, the support platform and the stirring mechanism are connected to each other and are connected to each other. A sealing structure is provided between the vertical shafts, and a raffinate phase suction pipe is laid on the inner bottom surface of the upper extraction bin, one end of the raffinate phase suction pipe is located in the upper extraction bin, and the other end passes through the upper extraction bin and the side walls of the outer shell and is connected to a suction pump, and an outlet pipe of the suction pump passes through the outer shell and the side walls of the lower extraction bin to reach the lower extraction bin, an upper sliding sleeve is provided on the cover plate, an upper extraction phase suction pipe is provided in the upper sliding sleeve, a lower sliding sleeve passing through the bottom of the outer shell is provided on the bottom surface of the lower extraction bin, a lower extraction phase suction pipe is provided in the lower sliding sleeve, a discharge port passing through the outer shell is provided at the bottom of the lower extraction bin, and a discharge valve is provided at the discharge port.

[0007] In the above-mentioned device for separating n-hexane by liquid-liquid extraction, the inner wall of the lower sliding sleeve is provided with a damping sealing layer in close contact with the lower suction pipe of the extraction phase, and the inner wall of the upper sliding sleeve is provided with a damping sealing layer in close contact with the upper suction pipe of the extraction phase.

[0008] In the above-mentioned device for separating n-hexane by liquid-liquid extraction, the cover plate is provided with a feed inlet and an upper inlet for extractant connected to the upper extraction chamber, and the side of the shell is provided with a lower inlet for extractant connected to the lower extraction chamber.

[0009] In the above-mentioned device for separating n-hexane by liquid-liquid extraction, a stopper structure is provided between the edge of the cover plate and the upper edge of the shell, and a sealing ring is provided at the stopper position of the cover plate.

[0010] In the above-mentioned device for separating n-hexane by liquid-liquid extraction, the shell and the side wall of the extraction pool are both transparent structures.

[0011] The beneficial effects of the utility model are:

[0012] 1. When in use, first use the upper extraction chamber to receive the raw materials and the extractant, and use the upper stirring paddle to realize the first stirring extraction operation. After the first stirring extraction is completed, use the upper extraction phase suction pipe and external suction equipment to suck the extraction phase, and then use the raffinate phase suction pipe and suction pump to pump the raffinate phase in the upper extraction chamber to the lower extraction chamber. After adding the extractant to the lower extraction chamber again, perform the second stirring extraction operation under the action of the lower stirring paddle. After completion, use the lower extraction phase suction pipe and external suction equipment to suck the extraction phase, and then open the discharge valve to discharge the raffinate phase for analysis. During the whole process, there is no need for staff to transfer the raffinate phase, which solves the problem of troublesome operation in the existing liquid-liquid extraction equilibrium kettle, thereby improving the separation efficiency of n-hexane.

[0013] 2. The water bath jacket pre-dries the lower extraction chamber, and no manual processing is required by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] In the figure: 1. cover plate, 2. upper sliding sleeve, 3. upper suction pipe for extraction phase, 4. feed port, 5. motor, 6. upper inlet for extractant, 7. sealing ring, 8. outer shell, 9. upper stirring paddle, 10. suction pipe for raffinate phase, 11. suction pump, 12. lower stirring paddle, 13. discharge valve, 14. discharge port, 15. lower suction pipe for extraction phase, 16. lower sliding sleeve, 17. support platform, 18. lower inlet for extractant, 19. lower extraction chamber, 20. upper extraction chamber, 21. stirring shaft. DETAILED DESCRIPTION

[0016] The utility model is described in detail according to the accompanying drawings of the specification.

[0017] like Figure 1 As shown, the device for separating n-hexane by liquid-liquid extraction comprises a housing 8 with a water bath jacket, an extraction tank and a stirring mechanism.

[0018] The extraction pool includes an upper extraction chamber 20 and a lower extraction chamber 19 arranged in the outer shell 8. A support platform 17 is provided at the bottom center of the upper extraction chamber 20, and a cover plate 1 covering the upper extraction chamber 20 is provided on the top of the outer shell 8. The stirring mechanism includes a motor 5 fixed on the cover plate 1, a stirring shaft 21 whose upper end is connected to the motor 5 and whose lower end passes through the support platform 17 to reach the lower extraction chamber 19, and an upper stirring paddle 9 and a lower stirring paddle 12 arranged on the stirring shaft 21. The upper stirring paddle 9 is located in the upper extraction chamber 20, and the lower stirring paddle 12 is located in the lower extraction chamber 19. A sealing structure is provided between the support platform 17 and the stirring shaft 21 to prevent liquid leakage from the upper extraction chamber 20.

[0019] The inner bottom surface of the upper extraction bin 20 is provided with a raffinate phase suction pipe 10, one end of which is located in the upper extraction bin 20, and the other end passes through the upper extraction bin 20 and the side wall of the outer shell 8 and is connected to a suction pump 11, and the outlet pipe of the suction pump 11 passes through the outer shell and the side wall of the lower extraction bin to reach the lower extraction bin. The cover plate 1 is provided with an upper sleeve 2, and an upper extraction phase suction pipe 3 is provided in the upper sleeve 2. The bottom surface of the lower extraction bin 19 is provided with a lower sleeve 16 passing through the bottom of the outer shell 8, and an extraction phase lower suction pipe 15 is provided in the lower sleeve 16. The bottom of the lower extraction bin 19 is provided with a discharge port 14 passing through the outer shell 8, and a discharge valve 13 is provided at the discharge port 14.

[0020] In this embodiment, the inner wall of the lower sleeve 16 is provided with a damping sealing layer in close contact with the lower suction pipe 15 of the extraction phase, and the inner wall of the upper sleeve 2 is provided with a damping sealing layer in close contact with the upper suction pipe 3 of the extraction phase. The cover plate 1 is provided with a feed port 4 and an upper extractant addition port 6 connected to the upper extraction chamber 20, and the side of the shell 8 is provided with an extractant lower addition port 18 connected to the lower extraction chamber 19. A stopper structure is provided between the edge of the cover plate 1 and the upper edge of the shell 8, and the cover plate 1 is provided with a sealing ring 7 at the stopper position. The shell 8 and the side wall of the extraction tank are both transparent structures to facilitate observation of liquid-liquid stratification.

[0021] Working principle:

[0022] When in use, raw materials and extractants are added to the upper extraction chamber 20 through the feed inlet 4 and the extractant upper addition inlet 6, and the motor 5 is started to drive the upper stirring paddle 9 to rotate, so as to perform the first stirring extraction operation on the mixed liquid entering the upper extraction chamber 20, and complete the first extraction under the heating of the water bath jacket;

[0023] The staff lowers the upper extraction phase suction pipe 3 according to the layer height and uses the damping sealing layer to position it, starts the external suction equipment to suck the extraction phase, and then uses the extraction phase suction pipe 10 and the suction pump 11 to pump the extraction phase in the upper extraction chamber 20 into the lower extraction chamber 19; after adding the extraction agent again to the lower extraction chamber 19 through the extraction agent lower addition inlet 18, the motor 5 is started, and the lower stirring paddle 12 rotates, so as to perform a second stirring extraction operation on the mixed liquid entering the lower extraction chamber 19, and complete the second extraction under the heating cooperation of the water bath jacket;

[0024] According to the layer height, the staff moves down the mouth of the extraction phase lower suction pipe 15 and uses the damping sealing layer to position it, starts the external suction equipment to suck the extraction phase, and then opens the discharge valve 13 to discharge the residual phase for analysis.

[0025] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A device for separating n-hexane by liquid-liquid extraction, comprising a housing, an extraction tank and a stirring mechanism, characterized in that: The extraction pool comprises an upper extraction chamber and a lower extraction chamber arranged in the shell, a support platform is arranged at the bottom center of the upper extraction chamber, a cover plate covering the upper extraction chamber is arranged on the top of the shell, the stirring mechanism comprises a motor fixed on the cover plate, a stirring vertical shaft connected to the motor at the upper end and passing through the support platform at the lower end to reach the lower extraction chamber, an upper stirring paddle and a lower stirring paddle arranged on the stirring vertical shaft, the upper stirring paddle is located in the upper extraction chamber, the lower stirring paddle is located in the lower extraction chamber, a sealing structure is arranged between the support platform and the stirring vertical shaft, and the inner A raffinate phase suction pipe is laid on the bottom surface, one end of the raffinate phase suction pipe is located in the upper extraction bin, and the other end passes through the upper extraction bin and the side wall of the outer shell and is connected to a suction pump, the outlet pipe of the suction pump passes through the outer shell and the side wall of the lower extraction bin to reach the lower extraction bin, an upper sliding sleeve is provided on the cover plate, an upper extraction phase suction pipe is provided in the upper sliding sleeve, a lower sliding sleeve passing through the bottom of the outer shell is provided on the bottom surface of the lower extraction bin, a lower extraction phase suction pipe is provided in the lower sliding sleeve, a discharge port passing through the outer shell is provided at the bottom of the lower extraction bin, and a discharge valve is provided at the discharge port.

2. The device for separating n-hexane by liquid-liquid extraction according to claim 1, characterized in that: The inner wall of the lower sliding sleeve is provided with a damping sealing layer which is in close contact with the lower suction pipe of the extraction phase, and the inner wall of the upper sliding sleeve is provided with a damping sealing layer which is in close contact with the upper suction pipe of the extraction phase.

3. The device for separating n-hexane by liquid-liquid extraction according to claim 1, characterized in that: The cover plate is provided with a feed inlet and an upper extracting agent adding inlet which are connected with the upper extraction chamber, and the side of the shell is provided with a lower extracting agent adding inlet which is connected with the lower extraction chamber.

4. The device for separating n-hexane by liquid-liquid extraction according to claim 1, characterized in that: A stopper structure is provided between the edge of the cover plate and the upper edge of the shell, and a sealing ring is provided at the stopper position of the cover plate.

5. The device for separating n-hexane by liquid-liquid extraction according to claim 1, characterized in that: The shell and the side wall of the extraction pool are both transparent structures.

Images