Rectification and purification device for cyclohexane

Abstract

The utility model relates to a cyclohexane rectification purification device which comprises a vertical shell and a stirring mechanism, the stirring mechanism comprises a stirring motor, a vertical shaft and stirring blades, and the technical key points are as follows: the vertical shaft is a hollow shaft, the upper end of the vertical shaft is rotatably connected with a concentric water supply pipeline, and the upper end of the concentric water supply pipeline is connected with a cleaning liquid delivery pipeline; a connecting sleeve is arranged between the stirring blade and the vertical shaft, a radial hole communicated with a hollow cavity of the vertical shaft is formed in the connecting sleeve, a radial passage communicated with the radial hole is formed in the stirring blade, a gland with a liquid spraying hole is arranged at the tail end of the radial passage, and at least two longitudinal electric push rods are fixed to the top of the vertical shell; an annular scraping plate in contact with the inner wall of the vertical shell is arranged in the top of the vertical shell, the lower end of a telescopic rod of each longitudinal electric push rod is fixedly connected with the upper surface of the annular scraping plate, and the inner diameter of the annular scraping plate is larger than the diameter of the circumferential surface where the tail ends of the stirring blades are located. The device solves the problem of scaling of the inner wall of the vertical shell, and is convenient to clean, good in cleaning effect and high in cleaning efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a cyclohexane distillation and purification device. Background Art

[0002] Cyclohexane, also known as hexahydrobenzene, is a colorless liquid with a pungent odor. It is one of the most widely used hydrocarbon solvents in industry today and is also the most representative non-polar solvent. It is insoluble in water, soluble in most organic solvents, and is very flammable. It is generally used as a solvent, a standard substance for chromatography analysis, and for organic synthesis. It can be used in resins, coatings, fats, paraffin oils, and can also be used to prepare organic substances such as cyclohexanol and cyclohexanone.

[0003] In order to improve the purity, cyclohexane needs to be further distilled after preparation. CN 212974227 U discloses a cyclohexane rectification and purification device, including a heating tank, a volatilizer is provided at the top of the heating tank, a tank cover is provided at the top of the volatilizer, a stirring shaft driven by a motor is provided inside the heating tank, and a stirring blade is provided on the stirring shaft. The device drives the stirring blade to rotate by the motor to stir the unpurified cyclohexane liquid during the heating process of cyclohexane, thereby accelerating the volatilization of the cyclohexane liquid, and improving the purification efficiency of cyclohexane to a certain extent. At the same time, the L-shaped support plate is driven to rotate by the stirring shaft, so that the cleaning brush plate on the L-shaped support plate cleans the inner wall of the heating tank, thereby avoiding the impurities in the cyclohexane liquid from scaling on the inner wall of the heating tank, thereby bringing convenience to the later cleaning work. However, there are the following problems during use: although the scaling of the inner wall of the heating tank is prevented, scaling problems will also occur on the cleaning brush, which is inconvenient to clean. Summary of the invention

[0004] The utility model aims to provide a cyclohexane distillation and purification device with reasonable structure and reliable use, which solves the problem of scaling on the inner wall of a heating tank, is convenient to clean, has good cleaning effect and high cleaning efficiency.

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

[0006] A cyclohexane rectification and purification device comprises a vertical shell with a heating jacket and a stirring mechanism, wherein the stirring mechanism comprises a stirring motor fixed to the bottom of the vertical shell, a vertical shaft arranged in the vertical shell and connected to the output end of the stirring motor, and a plurality of stirring blades arranged on the vertical shaft from top to bottom. The technical key points are: the vertical shaft is a hollow shaft and its upper end is connected to a concentric water supply pipeline by a rotating joint, the upper end of the concentric water supply pipeline is led out of the top surface of the vertical shell and connected to a cleaning liquid transmission pipeline, and a connecting rod is arranged between the stirring blade and the vertical shaft. A connecting sleeve is provided with a radial hole connected to the hollow cavity of the vertical shaft, a radial passage connected to the radial hole is provided in the stirring blade, a pressure cover is provided at the end of the radial passage, and a liquid spray hole facing the inner wall of the vertical shell is provided at the center of the pressure cover, at least two longitudinal electric push rods are fixed on the top of the vertical shell, and an annular scraper in contact with the inner wall of the vertical shell is built into the top of the vertical shell, the lower end of the telescopic rod of each longitudinal electric push rod is connected and fixed to the upper surface of the annular scraper, and the inner diameter of the annular scraper is larger than the diameter of the circumferential surface where the end of the stirring blade is located.

[0007] In the above-mentioned cyclohexane distillation and purification device, the longitudinal electric push rod is a multi-section electric push rod.

[0008] The above-mentioned cyclohexane distillation and purification device has an annular support plate fixed on the top of the vertical shell, an annular isolation cylinder is provided between the inner wall of the annular support plate and the top surface of the vertical shell, the lower end of the shell of the longitudinal electric push rod is connected and fixed to the annular support plate, and the telescopic rod of the longitudinal electric push rod passes through the annular support plate and is connected to the annular scraper.

[0009] In the above-mentioned cyclohexane distillation and purification device, a liquid-catching grid frame is fixed to the lower end of the annular isolation cylinder, a sleeve cooperating with the vertical shaft is provided at the center of the liquid-catching grid frame, a liquid-catching net is fixed to the lower surface of the liquid-catching grid frame, and a gas outlet is provided on the top surface of the vertical shell above the annular isolation cylinder, and the gas outlet is connected to the cyclohexane collection pipeline.

[0010] In the above-mentioned cyclohexane distillation and purification device, the stirring blade at the bottom of the vertical shaft includes a transverse blade and an inclined blade connected to the lower surface of the transverse blade, the transverse blade is provided with a radial passage connected to the radial hole, the inclined blade is provided with an oblique passage connected to the radial passage, the end of the oblique passage is provided with a pressure cover and the center of the pressure cover is provided with a liquid injection hole facing the bottom surface of the vertical shell, the bottom surface of the vertical shell is a conical surface and is connected to a waste discharge pipeline, and a feed pipeline is provided on the upper part of the side wall of the vertical shell.

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

[0012] After the distillation operation is completed by the stirring mechanism and the heating jacket, the waste liquid is discharged, and pressurized cleaning water is filled into the vertical shaft through the cleaning liquid transmission pipeline and the concentric water supply pipeline. The cleaning water is transmitted to the position of the liquid spray hole of the gland through the radial passage of the stirring blade, and then sprayed on the inner wall of the vertical shell. During the rotation of the stirring blade, the inner wall of the vertical shell is impact-cleaned, and then the longitudinal electric push rod is started at the same time to push the annular scraper downward to scrape off the material adhered to the inner wall of the vertical shell, and the waste liquid generated by the cleaning is discharged from the bottom of the vertical shell. This device solves the problem of scaling of the inner wall of the heating tank, that is, the vertical shell of this application, and is convenient to clean, with good cleaning effect and high cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0015] In the figure: 1. longitudinal electric push rod, 2. feed pipeline, 3. vertical shell, 4. stirring blade, 5. radial passage, 6. inclined blade, 7. oblique passage, 8. vertical shaft, 9. stirring motor, 10. waste discharge pipeline, 11. gas outlet, 12. concentric water supply pipeline, 13. annular isolation cylinder, 14. rotary joint, 15. annular support plate, 16. annular scraper, 17. liquid collection grid, 18. liquid collection net, 19. gland, 20. connecting sleeve. DETAILED DESCRIPTION

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

[0017] like Figure 1 , Figure 2 As shown, the cyclohexane rectification and purification device comprises a vertical shell 3 with a heating jacket and a stirring mechanism. The stirring mechanism comprises a stirring motor 9 fixed to the bottom of the vertical shell 3, a vertical shaft 8 arranged in the vertical shell 3 and connected to the output end of the stirring motor 9, and a plurality of stirring blades 4 arranged on the vertical shaft 8 from top to bottom.

[0018] The vertical shaft 8 is a hollow shaft and its upper end is connected to the concentric water supply pipeline 12 by means of a rotary joint 14. The upper end of the concentric water supply pipeline 12 is led out of the top surface of the vertical shell 3 and connected to the cleaning liquid delivery pipeline. A connecting sleeve 20 is provided between the stirring blade 4 and the vertical shaft 8, and the connecting sleeve 20 is provided with a radial hole connected to the hollow cavity of the vertical shaft 8. A radial passage 5 connected to the radial hole is provided in the stirring blade 4. A pressure cap 19 is provided at the end of the radial passage 5, and a liquid spraying hole facing the inner wall of the vertical shell 3 is provided at the center of the pressure cap 19. In this embodiment, the stirring blade 4 at the bottom of the vertical shaft 8 includes a transverse blade and an inclined blade 6 connected to the lower surface of the transverse blade, the transverse blade is provided with a radial passage 5 connected to the radial hole, the inclined blade 6 is provided with an oblique passage 7 connected to the radial passage 5, the end of the oblique passage 7 is provided with a pressure cover 19 and the center of the pressure cover 19 is provided with a liquid spray hole facing the bottom surface of the vertical shell 3, the bottom surface of the vertical shell 3 is a conical surface and is connected to the waste discharge pipeline 10, and the upper part of the side wall of the vertical shell 3 is provided with a feed pipeline 2.

[0019] At least two longitudinal electric push rods 1 are fixed on the top of the vertical housing 3. An annular scraper 16 in contact with the inner wall of the vertical housing 3 is built into the top of the vertical housing 3. The lower end of the telescopic rod of each longitudinal electric push rod 1 is connected and fixed to the upper surface of the annular scraper 16. The inner diameter of the annular scraper 16 is larger than the diameter of the circumferential surface where the end of the stirring blade 4 is located. In this embodiment, the longitudinal electric push rod 1 is a multi-section electric push rod to increase the stroke. An annular support plate 15 is fixed on the top of the vertical housing 3. An annular isolation cylinder 13 is provided between the inner wall of the annular support plate 15 and the top surface of the vertical housing 3. The lower end of the housing of the longitudinal electric push rod 1 is connected and fixed to the annular support plate 15, and the telescopic rod of the longitudinal electric push rod 1 passes through the annular support plate 15 and then connects to the annular scraper 16. A liquid-catching grid frame 17 is fixed to the lower end of the annular isolation cylinder 13, a sleeve cooperating with the vertical shaft 8 is provided at the center of the liquid-catching grid frame 17, a liquid-catching net 18 is fixed to the lower surface of the liquid-catching grid frame 17, and a gas outlet 11 is provided on the top surface of the vertical shell 3 above the annular isolation cylinder 13, and the gas outlet 11 is connected to the cyclohexane collection pipeline.

[0020] Working principle:

[0021] 1. During operation, unpurified cyclohexane liquid is first added into the pre-heated vertical shell 3 from the feed pipeline 2. The cyclohexane liquid volatilizes after reaching the preset temperature. During the heating process, the stirring motor 9 is started to drive the vertical shaft 8 to drive the stirring blade 4 to rotate, further accelerating the volatilization of cyclohexane. The volatilized cyclohexane vapor is first filtered out of the liquid droplets contained therein by the liquid capture net 18 during the rising process, and then discharged to the cyclohexane collection pipeline through the gas outlet 11. After the purification of cyclohexane is completed, the waste discharge pipeline 10 is opened to discharge the waste liquid in the vertical shell 3.

[0022] 2. Pressurized cleaning water is filled into the vertical shaft 8 through the cleaning liquid transmission pipeline and the concentric water supply pipeline 12. The cleaning water is transmitted to the spray hole position of the pressure cover 19 through the radial passage 5 and the oblique passage 7 of the stirring blade 4, and then sprayed on the inner wall and the bottom surface of the vertical shell 3. During the rotation of the stirring blade 4, the inner wall and the bottom surface of the vertical shell 3 are impact-cleaned. At the same time, the longitudinal electric push rod 1 is started to push the annular scraper 16 downward to scrape off the material adhered to the inner wall of the vertical shell 3. The waste liquid generated by the cleaning is discharged from the waste discharge pipeline 10.

[0023] 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 cyclohexane rectification and purification device, comprising a vertical shell with a heating jacket and a stirring mechanism, wherein the stirring mechanism comprises a stirring motor fixed to the bottom of the vertical shell, a vertical shaft arranged in the vertical shell and connected to the output end of the stirring motor, and a plurality of stirring blades arranged on the vertical shaft at intervals from top to bottom, characterized in that: The vertical shaft is a hollow shaft and its upper end is connected to a concentric water supply pipeline by a rotating joint. The upper end of the concentric water supply pipeline leads out of the top surface of the vertical shell and is connected to the cleaning liquid transmission pipeline. A connecting sleeve is provided between the stirring blade and the vertical shaft, and the connecting sleeve is provided with a radial hole connected to the hollow cavity of the vertical shaft. A radial passage connected to the radial hole is provided in the stirring blade, and a pressure cover is provided at the end of the radial passage, and a liquid spraying hole facing the inner wall of the vertical shell is provided at the center of the pressure cover. At least two longitudinal electric push rods are fixed on the top of the vertical shell, and an annular scraper in contact with the inner wall of the vertical shell is built into the top of the vertical shell. The lower end of the telescopic rod of each longitudinal electric push rod is connected and fixed to the upper surface of the annular scraper, and the inner diameter of the annular scraper is larger than the diameter of the circumferential surface where the end of the stirring blade is located.

2. The cyclohexane rectification and purification device according to claim 1, characterized in that: The longitudinal electric push rod is a multi-section electric push rod.

3. The cyclohexane rectification and purification device according to claim 1, characterized in that: An annular support plate is fixed on the top of the vertical shell, an annular isolation cylinder is provided between the inner wall of the annular support plate and the top surface of the vertical shell, the lower end of the shell of the longitudinal electric push rod is connected and fixed to the annular support plate, and the telescopic rod of the longitudinal electric push rod passes through the annular support plate and is connected to the annular scraper.

4. The cyclohexane rectification and purification device according to claim 3, characterized in that: A liquid-catching grid frame is fixed at the lower end of the annular isolation cylinder, a sleeve cooperating with the vertical shaft is provided at the center of the liquid-catching grid frame, a liquid-catching net is fixed on the lower surface of the liquid-catching grid frame, and a gas outlet is provided on the top surface of the vertical shell above the annular isolation cylinder, and the gas outlet is connected to the cyclohexane collection pipeline.

5. The cyclohexane rectification and purification device according to claim 1, characterized in that: The stirring blade at the bottom of the vertical shaft includes a transverse blade and an inclined blade connected to the lower surface of the transverse blade, the transverse blade is provided with a radial passage connected to the radial hole, the inclined blade is provided with an oblique passage connected to the radial passage, the end of the oblique passage is provided with a pressure cover and the center of the pressure cover is provided with a spray hole facing the bottom surface of the vertical shell, the bottom surface of the vertical shell is a conical surface and is connected to a waste discharge pipeline, and a feed pipeline is provided on the upper part of the side wall of the vertical shell.

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