High-purity n-hexane continuous purification equipment adopting novel filtering membrane technology

Abstract

The utility model relates to high-purity n-hexane continuous purification equipment adopting a novel filter membrane technology, which comprises an extraction tank and a reinforced evaporation device, and is technically characterized in that an upper mixing bin, a middle upper transition bin, a middle lower transition bin and a discharge bin are arranged in the extraction tank, and a first hollow support plate is supported on the upper edge of a conical hopper at the bottom of the upper mixing bin; a second hollowed-out supporting plate is arranged between the upper middle transition bin and the lower middle transition bin, a third hollowed-out supporting plate is arranged between the lower middle transition bin and the discharging bin, lipophilic filtering membranes are laid on the upper surfaces of the first hollowed-out supporting plate, the second hollowed-out supporting plate and the third hollowed-out supporting plate respectively, and heating medium conveying coil pipes are arranged in the lower middle transition bin and the discharging bin respectively. Outer guide pipelines are arranged on the upper portions of the side walls of the upper middle transition bin, the lower middle transition bin and the discharging bin respectively, a condenser is arranged on the top of the extraction tank, all the outer guide pipelines are communicated with an inlet of the condenser through collecting pipes, and an outlet of the condenser is communicated with the upper mixing bin. According to the equipment, the purification efficiency is remarkably improved, and the purity of the n-hexane product is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to n-hexane purification equipment technical field, concretely relates to a kind of high-purity n-hexane continuous purification equipment of novel filter membrane technology. BACKGROUND

[0002] N-hexane is an organic compound, belongs to straight-chain saturated aliphatic hydrocarbons, colorless liquid, insoluble in water, soluble in ethanol, diethyl ether, acetone, chloroform and most organic solvents, mainly used as solvent, chromatographic analysis reference material, paint thinner, polymerization reaction medium etc., also can be used for organic synthesis.

[0003] At present, n-hexane can be extracted by liquid-liquid extraction method, and the components in solvent are separated or extracted by different solubility. CN 221637392 U discloses a kind of n-hexane separation and purification system, it includes continuous extraction device and rotary evaporator, wherein, continuous extraction device includes extraction mechanism and shaking mechanism, shaking mechanism is fixedly connected with extraction mechanism, extraction mechanism is connected with rotary evaporator by detachable hose, by connecting continuous extraction device with rotary evaporator, residual extractant in extraction phase can be further purified and separated, so as to improve the purity of n-hexane. But there are still the following problems: although the extraction efficiency is improved under the action of shaking mechanism, the collection bottle outside is heated, and the extractant is evaporated by conduction to its inside, the heat conduction efficiency is low, and the purification efficiency is restricted. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of new filter membrane technology's high-purity n-hexane continuous purification equipment of structural rationality, use reliable, significantly improve purification efficiency, further improve the purity of n-hexane product to solve the above-mentioned problems.

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

[0006] The application discloses a high-purity n-hexane continuous purification equipment of a novel filtration membrane technology, comprising an extraction tank and a reinforced evaporation device, and has the following technical points: the extraction tank is sequentially provided with an upper mixing bin, a middle upper transition bin, a middle lower transition bin and a discharge bin from top to bottom; the bottom of the upper mixing bin is a cone hopper, the lower end of the upper mixing bin is provided with an extraction phase outlet, the lower surface of the cone hopper is provided with a thickened partition plate, the upper surface of the cone hopper is supported by a first hollow support plate, the second hollow support plate is arranged between the middle upper transition bin and the middle lower transition bin, the third hollow support plate is arranged between the middle lower transition bin and the discharge bin, the upper surfaces of the first, second and third hollow support plates are respectively paved with lipophilic filter membranes, the upper mixing bin is provided with a stirring mechanism, the middle lower transition bin and the discharge bin are respectively provided with a heating medium conveying coil pipe, the side walls of the middle upper transition bin, the middle lower transition bin and the discharge bin are respectively provided with an outer pipe line, the top of the extraction tank is provided with a condenser, the outer pipe lines are connected with the inlet of the condenser through a collecting pipe, the outlet of the condenser is communicated with the upper mixing bin, the lower end of the discharge bin is provided with a discharge port, the discharge port is connected with a booster pump through a pipe line, the outlet pipe line of the booster pump is communicated with the inlet of the reinforced evaporation device, and the vapor outlet of the reinforced evaporation device is communicated with the collecting pipe.

[0007] The high-purity n-hexane continuous purification equipment of the novel filtration membrane technology has the n-hexane raw material inlet and the extractant inlet which are arranged on the top of the extraction tank and connected with the upper mixing bin, and the side wall of the upper mixing bin is provided with a waste discharge port corresponding to the position above the first hollow support plate.

[0008] The high-purity n-hexane continuous purification equipment of the novel filtration membrane technology has the stirring mechanism which is a stirring paddle arranged in the upper mixing bin, and the top center of the extraction tank is provided with a stirring motor connected with the stirring paddle.

[0009] The high-purity n-hexane continuous purification equipment of the novel filtration membrane technology has the annular pipe line communicated with the outlet of the condenser which is suspended on the top of the upper mixing bin, and the lower surface of the annular pipe line is uniformly provided with a plurality of condensate pouring ports.

[0010] The high-purity n-hexane continuous purification equipment of the novel filtration membrane technology has the reinforced evaporation device which comprises an evaporation tank, a central vertical pipe arranged in the evaporation tank, a hollow sleeve concentric with the central vertical pipe, a first connecting rib group connected between the central vertical pipe and the hollow sleeve, a second connecting rib group connected between the hollow sleeve and the inner wall of the evaporation tank, a first heating rod arranged in the central vertical pipe, a plurality of second heating rods arranged in the hollow sleeve, a concentric pipe arranged around the upper end of the central vertical pipe, a plurality of nozzles arranged on the inner side of the concentric pipe and facing the central vertical pipe, and a transition pipe arranged on the outer side of the concentric pipe and communicated with the inlet of the reinforced evaporation device.

[0011] The high-purity n-hexane continuous purification equipment based on the novel filtration membrane technology described above has a baffle plate built into the top of the evaporator, with multiple vent holes evenly distributed on the baffle plate, and a vapor outlet fixed on the top surface of the evaporator.

[0012] The aforementioned novel filtration membrane technology for high-purity continuous purification of n-hexane has a central riser forming a first storage chamber with a hollow sleeve, and a hollow sleeve forming a second storage chamber with the inner wall of an evaporator. The bottom of the first and second storage chambers are respectively provided with n-hexane product outlets.

[0013] The beneficial effects of this utility model are:

[0014] 1. After the n-hexane feedstock and extractant are mixed in the upper mixing chamber, a solvent is formed. The solvent flows down through the lipophilic filter membrane on the first perforated support plate and then down to the upper-middle transition chamber. It is then filtered by the lipophilic filter membrane at the bottom of the upper-middle transition chamber and flows down to the lower-middle transition chamber. Finally, it flows down through the lipophilic filter membrane at the bottom of the lower-middle transition chamber to the discharge chamber. This multiple filtration process results in the material flowing down in stages, which is decomposed into multiple segments. This facilitates segmented heating to quickly release the extractant vapor. The extractant vapor flows through an external conduit to the condenser. After being condensed into liquid, it flows back to the upper mixing chamber to continue participating in the extraction. This avoids waste and significantly improves the purification efficiency.

[0015] 2. The liquid from the extraction tank is pumped through a booster pump, the concentric tube inside the enhanced evaporation device, and multiple nozzles to the upper part of the central riser. As the liquid flows down the central riser, it is heated, which helps to accelerate the evaporation of the extractant. When the liquid passes through the hollow sleeve, it is also heated again, which further accelerates the evaporation of the extractant. The evaporated extractant is finally discharged to the condenser through the vent hole of the baffle plate and the steam outlet. The material after passing through the enhanced evaporation device is further purified, which further improves the purity of the product. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of a medium-intensity evaporation unit;

[0018] Figure 3 yes Figure 1 Enlarged view of section A.

[0019] In the figure: 1. n-hexane raw material inlet, 2. extractant inlet, 3. stirring motor, 4. condenser, 5. annular pipeline, 6. upper mixing bin, 7. stirring paddle, 8. extraction tank, 9. lipophilic filter membrane, 10. waste outlet, 11. outer conduit, 12. first hollow support plate, 13. extraction phase outlet, 14. upper-middle transition bin, 15. second hollow support plate, 16. lower-middle transition bin, 17. discharge bin, 18. third hollow support plate, 19. heating medium transfer coil, 20. discharge outlet, 21. lifting pump, 22. evaporation tank, 23. liquid blocking plate, 24. central vertical pipe, 25. concentric pipe, 26. vapor outlet, 27. spray head, 28. first heating rod, 29. hollow sleeve, 30. second connecting rib group, 31. second heating rod, 32. n-hexane product outlet, 33. first connecting rib group, 34. inlet, 35. transition pipe, 36. conical hopper, 37. thickened partition. DETAILED DESCRIPTION

[0020] The novel filter membrane technology continuous purification equipment for high-purity n-hexane will be described in detail according to the accompanying drawings.

[0021] As Figures 1-3 shown, the novel filter membrane technology continuous purification equipment for high-purity n-hexane comprises an extraction tank 8 and a reinforced evaporation device.

[0022] The upper mixing bin 6, the upper-middle transition bin 14, the lower-middle transition bin 16 and the discharge bin 17 are sequentially arranged in the extraction tank 8 from top to bottom.

[0023] The bottom of the upper mixing bin 6 is a conical hopper 36, and the lower end of the conical hopper 36 is provided with an extraction phase outlet 13. The lower surface of the conical hopper 36 is provided with a thickened partition 37. The first hollow support plate 12 is supported on the upper surface of the conical hopper 36. The second hollow support plate 15 is arranged between the upper-middle transition bin 14 and the lower-middle transition bin 16. The third hollow support plate 18 is arranged between the lower-middle transition bin 16 and the discharge bin 17. The upper surfaces of the first hollow support plate 12, the second hollow support plate 15 and the third hollow support plate 18 are respectively paved with lipophilic filter membranes 9.

[0024] A stirring mechanism is arranged in the upper mixing bin 6. The heating medium transfer coil 19 is arranged in the lower-middle transition bin 16 and the discharge bin 17, respectively. The outer conduits 11 are arranged on the side walls of the upper-middle transition bin 14, the lower-middle transition bin 16 and the discharge bin 17, respectively. The condenser 4 is arranged on the top of the extraction tank 8. Each outer conduit 11 is communicated with the inlet of the condenser 4 by means of a collector pipe. The outlet of the condenser 4 is communicated with the upper mixing bin 6.

[0025] In this embodiment, the top of the extraction tank 8 is provided with a n-hexane raw material inlet 1 and an extractant inlet 2 connected with the upper mixing bin 6, and the sidewall of the upper mixing bin 6 is provided with a waste discharge port 10 corresponding to the position above the first hollow support plate 12. The stirring mechanism is a stirring paddle 7 arranged in the upper mixing bin 6, and the top center of the extraction tank 8 is provided with a stirring motor 3 connected with the stirring paddle 7. The top of the upper mixing bin 6 is suspended with an annular pipeline 5 in communication with the outlet of the condenser 4, and the lower surface of the annular pipeline 5 is uniformly provided with a plurality of condensate dropping ports.

[0026] The lower end of the discharge bin 17 is provided with a discharge port 20 connected with a booster pump 21 through a pipeline, the outlet pipeline of the booster pump 21 is in communication with the inlet of the enhanced evaporation device, and the vapor outlet of the enhanced evaporation device is in communication with the manifold. In this embodiment, the enhanced evaporation device includes an evaporation tank 22, a central standpipe 24 arranged in the evaporation tank 22, a hollow sleeve 29 concentric with the central standpipe 24, a first connecting rib group 33 connected between the central standpipe 24 and the hollow sleeve 29, a second connecting rib group 30 connected between the hollow sleeve 29 and the inner wall of the evaporation tank 22, a first heating rod 28 arranged in the central standpipe 24, a plurality of second heating rods 31 arranged in the hollow sleeve 29, a concentric tube 25 arranged around the upper end of the central standpipe 24, a plurality of nozzles 27 are arranged on the inner side of the concentric tube 25 and face the central standpipe 24, and a transition pipe 35 is arranged on the outer side of the concentric tube 25 and is in communication with the inlet 34 of the enhanced evaporation device.

[0027] In this embodiment, the top of the evaporation tank 22 is built-in with a liquid baffle 23, the liquid baffle 23 is uniformly provided with a plurality of air vents, and the top surface of the evaporation tank 22 is fixed with a vapor outlet 26. The central standpipe 24 and the hollow sleeve 29 form a first storage cavity, the hollow sleeve 29 and the inner wall of the evaporation tank 22 form a second storage cavity, and the bottoms of the first storage cavity and the second storage cavity are respectively provided with n-hexane product outlets 32.

[0028] Working principle:

[0029] 1. The n-hexane raw material and the extractant are mixed in the upper mixing bin 6 by the stirring mechanism to form a solvent. The solvent passes through the lipophilic filter membrane 9 on the first hollow support plate 12 and falls downward to the middle-upper transition bin 14, and then is filtered downward to the middle-lower transition bin 16 through the lipophilic filter membrane 9 at the bottom of the middle-upper transition bin 14. Next, the solvent is filtered downward to the discharge bin 17 through the lipophilic filter membrane 9 at the bottom of the middle-lower transition bin 16, and the material body is phase-wise downward through multiple filtrations, that is, it is divided into multiple sections, which is beneficial for segmented heating to quickly precipitate the extractant vapor. The extractant vapor passes through the outer guide pipeline 11 to the condenser 4, is condensed into a liquid after passing through the condenser 4, and then flows back to the upper mixing bin 6 to continue participating in the extraction.

[0030] 2. The liquid from the extraction tank 8 is sprayed onto the upper part of the central riser 24 via the booster pump 21, transition pipe 35, concentric pipe 25 and multiple nozzles 27. The liquid is heated as it descends along the central riser 24, and is also heated again when it passes through the hollow sleeve 29. The evaporated extractant is finally discharged to the condenser 4 through the vent hole of the baffle plate 23 and the steam outlet 26. After being condensed into liquid by the condenser 4, it flows back to the upper mixing chamber 6 to continue participating in the extraction.

[0031] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A new type of high purity n-hexane continuous purification equipment of filtration membrane technology, comprising an extraction tank and a reinforced evaporation device, characterized in that: The upper mixing bin is provided with a conical hopper at the bottom, and an extraction phase outlet is arranged at the lower end of the conical hopper; the lower surface of the conical hopper is provided with a thickened partition; a first hollow support plate is arranged on the upper surface of the conical hopper; a second hollow support plate is arranged between the upper transition bin and the lower transition bin; a third hollow support plate is arranged between the lower transition bin and the discharge bin; the upper surfaces of the first, second and third hollow support plates are respectively paved with lipophilic filter membranes; a stirring mechanism is arranged in the upper mixing bin; heating medium transfer coil pipes are arranged in the lower transition bin and the discharge bin; outer pipelines are arranged on the side walls of the upper transition bin, the lower transition bin and the discharge bin; a condenser is arranged on the top of the extraction tank; the outer pipelines are connected to the inlet of the condenser through a collecting pipe; the outlet of the condenser is connected to the upper mixing bin; a discharge port is arranged at the lower end of the discharge bin; the discharge port is connected to a booster pump through a pipeline; the outlet pipeline of the booster pump is connected to the inlet of an enhanced evaporation device; the vapor outlet of the enhanced evaporation device is connected to the collecting pipe.

2. The novel continuous purification apparatus of high purity n-hexane using filtration membrane technology according to claim 1, characterized in that: A n-hexane raw material inlet and an extractant inlet are arranged on the top of the extraction tank and connected to the upper mixing bin; a waste discharge port is arranged on the side wall of the upper mixing bin and corresponds to the position above the first hollow support plate.

3. The novel continuous purification apparatus of high purity n-hexane using filtration membrane technology as claimed in claim 1, wherein: The stirring mechanism is a stirring paddle arranged in the upper mixing bin; a stirring motor is arranged at the center of the top of the extraction tank and connected to the stirring paddle.

4. The novel continuous purification apparatus of high purity n-hexane using filtration membrane technology as claimed in claim 1, wherein: An annular pipeline is arranged on the top of the upper mixing bin and connected to the outlet of the condenser; a plurality of condensate discharge ports are uniformly arranged on the lower surface of the annular pipeline.

5. The novel continuous purification apparatus of high purity n-hexane using filtration membrane technology as claimed in claim 1, wherein: The enhanced evaporation device comprises an evaporation tank, a central standpipe arranged in the evaporation tank, a hollow sleeve concentric with the central standpipe, a first connecting rib group connected between the central standpipe and the hollow sleeve, a second connecting rib group connected between the hollow sleeve and the inner wall of the evaporation tank, a first heating rod arranged in the central standpipe, a plurality of second heating rods arranged in the hollow sleeve, a concentric tube arranged around the upper end of the central standpipe, a plurality of nozzles arranged on the inner side of the concentric tube and facing the central standpipe, and a transition pipe arranged on the outer side of the concentric tube and connected to the inlet of the enhanced evaporation device.

6. The novel filtration membrane technology based high purity n-hexane continuous purification plant as claimed in claim 5 wherein: A liquid blocking plate is arranged in the top of the evaporation tank; a plurality of air vents are uniformly arranged on the liquid blocking plate; and a vapor outlet is fixed on the top surface of the evaporation tank.

7. The novel filtration membrane technology based high purity n-hexane continuous purification plant as claimed in claim 5 wherein: The central standpipe and the hollow sleeve form a first storage cavity, and the hollow sleeve and the inner wall of the evaporation tank form a second storage cavity; n-hexane product outlets are arranged at the bottoms of the first and second storage cavities, respectively.

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