Continuous extraction device for anilinoacetonitrile mother liquor

Abstract

The utility model provides an anilinoacetonitrile mother liquor continuous extraction device which comprises a tower body, a plurality of layers of tower trays enabling liquid to flow back and forth are evenly distributed in the tower body along the tower height, baffles are vertically fixed to the edges of the tower trays, a heavy liquid inlet and a light liquid outlet are formed in the upper end of the tower body, and a heavy liquid outlet and a light liquid inlet are formed in the lower end of the tower body. A vertical shaft vertically penetrating through the center of the tower tray is arranged in the tower body, a pore plate is transversely arranged below the tower tray, the height of the pore plate is consistent with that of the lower end edge of the baffle, and the vertical shaft penetrates through the center of the pore plate and is fixedly connected with the pore plate. According to the continuous extraction device for the anilinoacetonitrile mother liquor, the pore plate is arranged below the tower tray, and the height of the lower end edge of the pore plate is consistent with that of the lower end edge of the baffle. After the organic phase is contacted with the bottom surface of the mother liquor through the sieve pores in the tower tray for mass transfer, the organic phase can be intercepted and decelerated again through the pore plate in the rising process, and is further contacted with the top surface of the mother liquor for mass transfer. And the mass transfer efficiency and the extraction effect in continuous extraction are improved.

Description

Technical Field

[0001] This application relates to a continuous extraction technology for aniline acetonitrile, and more particularly to a continuous extraction apparatus for aniline acetonitrile mother liquor. Background Technology

[0002] Aniline acetonitrile (chemical structure containing amino and nitrile groups) is an important organic intermediate. Its mother liquor typically contains the target product, unreacted aniline, byproducts (such as cyanide or polymers), and solvents. Continuous extraction achieves efficient separation by utilizing the differences in the distribution of the target analyte between the organic phase and the mother liquor through countercurrent multi-stage mass transfer.

[0003] Existing continuous mother liquor extraction devices typically use centrifugal extractors or sieve plate extraction columns, with sieve plate extraction columns being more suitable for large-scale production. However, existing sieve plate extraction columns achieve extraction solely through mass transfer between the organic phase and the bottom of the mother liquor as the organic phase passes upward through the sieve openings on the tray. This not only results in low mass transfer efficiency but also leaves room for improvement in the extraction effect on the mother liquor. Utility Model Content

[0004] This application provides a continuous extraction device for aniline acetonitrile mother liquor to solve the problems of low mass transfer efficiency and relatively poor extraction effect of existing sieve plate extraction towers.

[0005] This application provides a continuous extraction device for aniline acetonitrile mother liquor, including a column body. Multiple trays are evenly distributed along the column height to allow for backflow of the liquid. Baffles are vertically fixed to the edges of the trays. The upper end of the column body has a heavy liquid inlet and a light liquid outlet, while the lower end has a heavy liquid outlet and a light liquid inlet. A vertical shaft passes through the center of the trays within the column body. A perforated plate is horizontally positioned below the trays, with its lower edge aligned with the upper end of the baffle. The vertical shaft passes through the center of the perforated plate and is fixedly connected to it.

[0006] Optionally, the vertical shaft is slidably connected to the through-type tower tray, and a reciprocating drive device is mounted on the top of the tower body. The upper end of the vertical shaft passes through a sleeve in the top wall of the tower body and is driven by the reciprocating drive device.

[0007] Optionally, the reciprocating drive device is a hydraulic cylinder drive mechanism or an eccentric wheel and connecting rod drive mechanism.

[0008] Optionally, a pipe for connecting the upper and lower ends of the tray is vertically fixed to one side edge of the tray, and a valve is installed on the pipe.

[0009] The aniline-acetonitrile mother liquor continuous extraction apparatus provided in this application features an orifice plate positioned below the tray, with the orifice plate aligned with the lower edge of a baffle. As the mother liquor flows downwards in a reverse flow, its top and bottom surfaces are located between the top of the tray and the lower edge of the baffle. After the organic phase undergoes mass transfer through the sieve holes on the tray and contacts the bottom surface of the mother liquor, it is further decelerated and intercepted by the orifice plate during its ascent, allowing for further mass transfer with the top surface of the mother liquor. This improves the mass transfer efficiency and extraction effect in continuous extraction. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of a continuous extraction apparatus for aniline-acetonitrile mother liquor provided in an embodiment of this application;

[0012] Figure 2 This is an enlarged view of section A of the continuous extraction apparatus for aniline-acetonitrile mother liquor provided in an embodiment of this application;

[0013] Figure 3 This is a cross-sectional view at the EE section of a continuous extraction apparatus for aniline acetonitrile mother liquor provided in an embodiment of this application;

[0014] Figure 4 This is a cross-sectional view at the FF section of a continuous extraction apparatus for aniline acetonitrile mother liquor provided in an embodiment of this application;

[0015] Figure 5 This is a left-side cross-sectional view of an aniline acetonitrile mother liquor continuous extraction apparatus provided in an embodiment of this application.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1. Tower body; 2. Tower tray; 3. Baffle; 4. Heavy liquid inlet; 5. Heavy liquid outlet; 6. Light liquid inlet; 7. Light liquid outlet; 8. Vertical shaft; 9. Orifice plate; 10. Sleeve; 11. Reciprocating drive device; 12. Pipeline; 13. Valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0019] like Figures 1-5 As shown, one embodiment of this application provides a continuous extraction device for aniline acetonitrile mother liquor, including a tower body 1. Multiple trays 2 are evenly distributed along the height of the tower body 1 to allow the liquid to flow in reverse. Baffles 3 are vertically fixed to the edges of the trays 2. The upper end of the tower body 1 has a heavy liquid inlet 4 and a light liquid outlet 7, while the lower end has a heavy liquid outlet 5 and a light liquid inlet 6. A vertical shaft 8 is provided inside the tower body 1, penetrating the center of the trays 2. A perforated plate 9 is provided horizontally below the trays 2, with the upper end of the perforated plate 9 aligned with the lower edge of the baffles 3. The vertical shaft 8 passes through the center of the perforated plate 9 and is fixedly connected to it.

[0020] During operation, the aniline acetonitrile mother liquor enters the column body 1 through the heavy liquid inlet 4 at the top, flows back and forth along the top surface of the tray 2 towards the bottom, and is finally discharged from the heavy liquid outlet 5. The organic phase used in the extraction enters the column body 1 through the light liquid inlet 6 at the bottom, floats up, is intercepted by the baffle 3, and is concentrated on the bottom surface of the tray 2.

[0021] The organic phase, concentrated below tray 2, passes through the sieve holes on tray 2 and comes into contact with the bottom of the mother liquor flowing on the top surface of tray 2 for mass transfer. It then continues to rise, is intercepted and slowed down again by orifice plate 9, and further contacts the top of the mother liquor for mass transfer. It then rises again through the through holes on orifice plate 9, and the organic phase gathers again at the bottom of the upper tray 2. After being dispersed and contacted by multiple trays 2 and orifice plates 9, the organic phase accumulates at the top of column 1 and is discharged through the light liquid outlet 7.

[0022] In this embodiment, an orifice plate 9 is installed below the tray 2, and the orifice plate 9 is aligned with the lower edge of the baffle 3. When the mother liquor flows downwards in a reverse flow, its top and bottom surfaces are located between the top of the tray 2 and the lower edge of the baffle 3. After the organic phase contacts the bottom surface of the mother liquor through the sieve holes on the tray 2 for mass transfer, it can be intercepted and slowed down again by the orifice plate 9 during its ascent, allowing for further contact and mass transfer with the top surface of the mother liquor. This improves the mass transfer efficiency and extraction effect in continuous extraction.

[0023] In one possible implementation, the vertical shaft 8 is slidably connected to the through tower tray 2, and a reciprocating drive device 11 is mounted on the top of the tower body 1. The upper end of the vertical shaft 8 passes through the sleeve 10 of the top wall of the tower body 1 and is driven by the reciprocating drive device 11.

[0024] The orifice plate 9 is fixed on the vertical shaft 8. The vertical shaft 8 is driven to move vertically back and forth by the reciprocating drive device 11, which can drive the orifice plate 9 to move up and down in the vertical direction. The reciprocating motion of the orifice plate 9 generates shear force, which breaks the mother liquor and organic phase into fine droplets, increases the mass transfer area, and improves the mass transfer effect.

[0025] In one possible implementation, the reciprocating drive device 11 is a hydraulic cylinder drive mechanism or an eccentric wheel and connecting rod drive mechanism.

[0026] The hydraulic cylinder drive mechanism is connected to the hydraulic station, and uses hydraulic pressure to move the vertical shaft 8 up and down. The eccentric wheel and connecting rod drive mechanism uses a motor to drive the eccentric wheel to rotate, which in turn causes the connecting rod to reciprocate, thereby moving the vertical shaft 8 up and down.

[0027] In one possible implementation, a pipe 12 for connecting the upper and lower ends of the tray 2 is vertically fixed to one side edge, and a valve 13 is installed on the pipe 12.

[0028] The flow rate of the drain pipe 12 can be controlled by valve 13. The drain pipe 12 can quickly discharge the organic phase accumulated at the bottom of the lower tray 2 to the bottom of the upper tray 2, so that the organic phase can be quickly and evenly distributed under each tray 2 and then pass through the sieve holes on each tray 2 to make contact and transfer mass. This avoids the organic phase being concentrated in the bottom tray 2, which would interrupt the mass transfer process of the upper tray 2.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A continuous extraction device for aniline acetonitrile mother liquor, comprising a tower body (1), a plurality of tower trays (2) for liquid return flow are uniformly distributed along the tower height in the tower body (1), the edges of the tower trays (2) are vertically fixed with baffle plates (3), the upper end of the tower body (1) is provided with a heavy liquid inlet (4) and a light liquid outlet (7), and the lower end is provided with a heavy liquid outlet (5) and a light liquid inlet (6), characterized in that: The tower body (1) is internally provided with a vertical shaft (8) vertically penetrating the center of the tower tray (2), the lower side of the tower tray (2) is transversely provided with a hole plate (9), the hole plate (9) is consistent with the lower end edge of the baffle (3) in height, the vertical shaft (8) penetrates the center of the hole plate (9) and is fixedly connected therewith.

2. The anilinoacetonitrile mother liquor continuous extraction apparatus of claim 1, wherein: The vertical shaft (8) is slidingly connected with the penetrated tower tray (2), the top of the tower body (1) is rotatably provided with a reciprocating driving device (11), the upper end of the vertical shaft (8) penetrates a sleeve (10) of the top wall of the tower body (1) and is driven by the reciprocating driving device (11).

3. The anilinoacetonitrile mother liquor continuous extraction apparatus of claim 2, wherein: The reciprocating driving device (11) is a hydraulic cylinder driving mechanism or an eccentric wheel connecting rod driving mechanism.

4. The anilinoacetonitrile mother liquor continuous extraction apparatus of claim 2 or 3, wherein: A side edge of the tower tray (2) is vertically fixed with a drain pipe (12) for communicating the upper and lower ends thereof, and a valve (13) is mounted on the drain pipe (12).

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