Rectification device for methyl phosphinic acid monoalkyl ester

Abstract

The utility model discloses a rectification device for methyl phosphinic acid monoalkyl ester, which relates to the field of rectification devices and comprises a rectification tower body, the middle of the side wall of the rectification tower body is provided with a feeding valve port, the top wall of the rectification tower body is provided with an air outlet valve port, the bottom of the rectification tower body is provided with a discharging valve port, and an electromagnetic heating pipe is fixed on the inner bottom wall; the stirring device is arranged at the lower part of the rectifying tower body; the anti-overflow plate is arranged above the feeding valve port, and a plurality of vent holes which are uniformly distributed are formed in the anti-overflow plate; an annular frame in the cleaning device is slidably arranged on the upper side wall of the rectifying tower body in the vertical direction, a mounting support is fixed to the middle of the annular frame, one ends of a plurality of cleaning rods are fixed to the lower end of the mounting support, the cleaning rods correspond to the vent holes one to one, and a reciprocating lifting mechanism drives the annular frame to move vertically. According to the device, through the arrangement of the reciprocating lifting mechanism, the annular frame and the cleaning rod, the ventilation holes in the anti-overflow plate can be cleaned, cleaning is convenient, the steam circulation effect is guaranteed, and then the rectification processing efficiency of methyl phosphinic acid monoalkyl ester is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation devices, in particular to a distillation device for monoalkyl methylphosphinate. Background Art

[0002] Since the global large-scale commercial planting of genetically modified crops, it has had a huge impact on the world's pesticide industry and market. Since about 90% of the global genetically modified crop planting area is for crops with glyphosate resistance traits, the large-scale and large-scale repeated use of glyphosate has led to the occurrence and development of resistant weeds. Paraquat, the world's second largest herbicide after glyphosate, has caused a large number of non-productive poisoning deaths due to the lack of antidotes. Its liquid agent is facing restrictions, causing paraquat to withdraw from the market. For this reason, glufosinate, the third largest herbicide after glyphosate and paraquat, has gained huge development space. In the synthesis method of methyl hypophosphite monoalkyl ester, it is necessary to use a distillation device to mix methyl hypophosphite with ROH, then add a catalyst, stir at 105-120°C for 6-10 hours, and obtain methyl hypophosphite monoalkyl ester by vacuum distillation.

[0003] In a distillation device in a Chinese patent (patent number: CN220026141U), the device includes a tower body, and the tower body is provided with an outlet at the top, a discharge port at the bottom, a reflux port at the tower body, a feed port and an air inlet, wherein the air inlet is located at the bottom of the tower body near the discharge port, the reflux port is located at the top of the tower body near the air outlet, the air inlet end is also connected to a gas valve, the feed port end is also connected to a material blocking mechanism, the material blocking mechanism is a one-way feeding structure, the tower body is equidistantly provided with tower plates, and the corresponding feed ports are located above the tower plates; the device can effectively alleviate the occurrence of liquid flooding, enhance the fluidity of liquid and gas, and greatly improve the distillation efficiency. However, the device is not provided with a mechanism for cleaning the holes of the orifice plate. After a long time, the holes of the orifice plate are easily blocked by condensate, which affects the circulation effect of steam, and the subsequent cleaning is more troublesome. Utility Model Content

[0004] The utility model aims to provide a distillation device for monoalkyl methylphosphinate to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the utility model provides a distillation device for monoalkyl methylphosphinate, comprising:

[0006] A distillation tower body, wherein the middle of the side wall of the distillation tower body is connected to a feed valve port, the top wall of the distillation tower body is connected to a gas outlet valve port, and the bottom of the distillation tower body is connected to a discharge valve port;

[0007] An electromagnetic heating tube is fixed on the inner bottom wall of the distillation tower body;

[0008] A stirring device is arranged at the lower part of the distillation tower body;

[0009] an anti-overflow plate, arranged in the distillation tower body and located above the feed valve port, the anti-overflow plate being provided with a plurality of vent holes evenly spaced apart; and,

[0010] The cleaning device comprises an annular frame, a mounting bracket, a plurality of cleaning rods and a reciprocating lifting mechanism, wherein the annular frame is slidably arranged on the upper side wall of the distillation tower body in an up-and-down direction, the mounting bracket is fixed to the middle of the annular frame, one end of a plurality of cleaning rods is fixed to the lower end of the mounting bracket, and the plurality of cleaning rods are arranged in a one-to-one correspondence with the plurality of vents, and the reciprocating lifting mechanism is connected to the annular frame for driving the annular frame to move up and down.

[0011] Furthermore, the reciprocating lifting mechanism comprises:

[0012] A first motor is fixed on a side wall of the distillation tower body, and a main shaft end of the first motor penetrates into the distillation tower body;

[0013] A cam, one end of which is fixed to the main shaft end of the first motor;

[0014] A pull rod, the upper end of which is hinged to an end of the cam away from its rotation center, and the lower end of which is hinged to the upper side wall of the annular frame.

[0015] Furthermore, the cleaning device further comprises a positioning and guiding mechanism, and the positioning and guiding mechanism comprises:

[0016] A concave plate is fixed on the inner wall of the distillation tower body, and the notch on the concave plate is arranged toward the inner cavity of the distillation tower body;

[0017] Positioning rods, fixed on the upper and lower inner walls of the concave plate;

[0018] A sliding sleeve, sleeved on the positioning rod;

[0019] An L-shaped rod has one end fixed to one side of the sliding sleeve and the other end fixedly connected to the annular frame.

[0020] Furthermore, the stirring device includes a second motor and a stirring rod group, the second motor is fixed on the bottom wall of the distillation tower body, the main shaft end of the second motor passes through the distillation tower body and is connected to the stirring rod group, and the stirring rod group is provided with a plurality of stirring rods.

[0021] Furthermore, a first through hole is provided on the bottom wall of the distillation tower body, and the first through hole is rotatably connected to the main shaft end of the second motor through a first waterproof bearing.

[0022] Furthermore, a second through hole is provided on the side wall of the distillation tower body, and the second through hole is rotatably connected to the main shaft end of the first motor through a second waterproof bearing.

[0023] Furthermore, the mounting bracket is arranged in a cross-shaped structure, and the four ends of the mounting bracket are fixedly connected to the inner wall of the annular frame by welding.

[0024] Furthermore, the mounting bracket is provided with a plurality of arc-shaped rods, and the arc-shaped rods are arranged on the mounting bracket to form an annular frame for fixing the cleaning rods, so that the plurality of cleaning rods and the plurality of vents are arranged in an annular shape.

[0025] Furthermore, a control switch is fixedly connected to the front side wall of the distillation tower body, and the control switch is electrically connected to the electromagnetic heating tube, the stirring device and the reciprocating lifting mechanism respectively.

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] By adding various raw materials processed by methylphosphinate monoalkyl ester at the feed valve port, starting the stirring device for stirring, the raw materials react at the lower part of the distillation tower body and discharge steam from the outlet valve port, and then discharge the remaining materials after the reaction from the discharge valve port. In this process, the electromagnetic heating tube is used to heat the various raw materials during the reaction. In this device, an anti-overflow plate is fixedly connected to the inner wall of the distillation tower body above the feed valve port to prevent overflow during the stirring reaction. Ventilation holes are evenly opened on the anti-overflow plate to circulate steam. When the vents are blocked, a plurality of cleaning rods corresponding to the vents are driven by a reciprocating lifting mechanism to move up and down and reciprocate to be inserted into the vents, so that the vents can be cleaned. The cleaning is convenient and the cleaning effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0029] Figure 2 This is a schematic diagram of the formal cross-sectional structure of the utility model;

[0030] Figure 3 For the utility model Figure 2 A schematic diagram of the enlarged structure at point A;

[0031] Figure 4 It is a three-dimensional structural schematic diagram of the anti-overflow plate and the annular frame in the utility model.

[0032] In the figure: 1. distillation tower body; 2. feed valve port; 3. outlet valve port; 4. outlet valve port; 5. electromagnetic heating tube; 6. anti-overflow plate; 7. vent hole; 8. ring frame; 9. mounting bracket; 10. cleaning rod; 11. first motor; 12. cam; 13. pull rod; 14. concave plate; 15. positioning rod; 16. sliding sleeve; 17. L-shaped rod; 18. second motor; 19. stirring rod; 20. control switch. DETAILED DESCRIPTION

[0033] See also Figures 1 to 4 A distillation device for monoalkyl methylphosphinate comprises a distillation tower body 1, an electromagnetic heating tube 5, a stirring device, an anti-overflow plate 6 and a cleaning device. The middle part of the side wall of the distillation tower body 1 is connected to a feed valve port 2, the top wall of the distillation tower body 1 is connected to a gas outlet valve port 3, and the bottom of the distillation tower body 1 is connected to a discharge valve port 4; the electromagnetic heating tube 5 is fixed on the inner bottom wall of the distillation tower body 1; the stirring device is arranged at the lower part of the distillation tower body 1; the anti-overflow plate 6 is arranged in the distillation tower body 1 and is located above the feed valve port 2, and the anti-overflow plate 6 is provided with a plurality of vents 7 evenly spaced; the cleaning device includes an annular frame 8, a mounting bracket 9, a plurality of cleaning rods 10 and a reciprocating lifting mechanism, the annular frame 8 is slidably arranged on the upper side wall of the distillation tower body 1 in the up and down directions, the mounting bracket 9 is fixed to the middle part of the annular frame 8, one end of the plurality of cleaning rods 10 is fixed to the lower end of the mounting bracket 9, and the plurality of cleaning rods 10 are arranged one by one with the plurality of vents 7, and the reciprocating lifting mechanism is connected to the annular frame 8 for driving the annular frame 8 to move up and down.

[0034] By adding various raw materials processed by methylphosphinate monoalkyl ester at the feed valve port 2, starting the stirring device for stirring, the raw materials react at the lower part of the distillation tower body 1, and then discharge steam from the gas outlet valve port 3, and then discharge the remaining materials after the reaction from the discharge valve port 4. In this process, the electromagnetic heating tube 5 is used to heat the various raw materials during the reaction, so that the temperature is maintained at 105-120°C. The specific reaction mechanism and heating method are prior art, so no further explanation is given here.

[0035] In the device, an anti-overflow plate 6 is fixedly connected to the inner wall of the distillation tower body 1 above the feed valve port 2 to prevent overflow during the stirring reaction. Ventilation holes 7 are evenly opened on the anti-overflow plate 6 to circulate steam. When the vent holes 7 are blocked, a plurality of cleaning rods 10 corresponding to the vent holes 7 are driven by a reciprocating lifting mechanism to move up and down and are inserted into the vent holes 7, so that the vent holes 7 can be cleaned, the cleaning is convenient, and the cleaning effect is good.

[0036] Specifically, the reciprocating lifting mechanism includes a first motor 11, a cam 12 and a pull rod 13. The first motor 11 is fixed on a side wall of the distillation tower body 1, and the main shaft end of the first motor 11 penetrates into the distillation tower body 1; one end of the cam 12 is fixed to the main shaft end of the first motor 11; the upper end of the pull rod is hinged to the end of the cam 12 away from the rotation center thereof, and the lower end of the pull rod 13 is hinged to the upper side wall of the annular frame 8.

[0037] The cam 12 is driven to rotate by the first motor 11. Since the cam 12 is hingedly connected to the pull rod 13, the pull rod 13 swings and moves, which can pull the annular frame 8 to move up and down reciprocatingly, so that the cleaning rod 10 on the mounting bracket 9 is repeatedly inserted into the vent hole 7 on the anti-overflow plate 6 for cleaning operation, which is convenient for cleaning and ensures the steam circulation effect, thereby ensuring the distillation processing efficiency of monoalkyl methyl phosphinate.

[0038] Furthermore, the cleaning device further includes a positioning guide mechanism, which includes a concave plate 14, a positioning rod 15, a sleeve 16 and an L-shaped rod 17. The concave plate 14 is fixed on the inner wall of the distillation tower body 1, and the notch on the concave plate 14 is arranged toward the inner cavity of the distillation tower body 1; the positioning rod 15 is fixed on the upper and lower inner walls of the concave plate 14; the sleeve 16 is sleeved on the positioning rod 15; one end of the L-shaped rod 17 is fixed to one side of the sleeve 16, and the other end is fixedly connected to the annular frame 8.

[0039] When the annular frame 8 is displaced, the sliding sleeve 16 fixed to the L-shaped rod 17 is driven to be displaced on the positioning rod 15, which can play a positioning and guiding role for the displacement of the annular frame 8 and ensure the straight up and down displacement of the annular frame 8.

[0040] Specifically, the stirring device includes a second motor 18 and a stirring rod 19 group. The second motor 18 is fixed on the bottom wall of the distillation tower body 1. The main shaft end of the second motor 18 passes through the distillation tower body 1 and is connected to the stirring rod 19 group. The stirring rod 19 group is provided with multiple stirring rods 19.

[0041] The stirring rod 19 is driven to rotate by the second motor 18 to fully mix the reaction raw materials such as methyl hypophosphorous acid, ROH and catalyst in the distillation tower body 1 to improve the reaction effect.

[0042] Specifically, a first through hole is opened on the bottom wall of the distillation tower body 1, and the first through hole is rotatably connected to the main shaft end of the second motor 18 through a first waterproof bearing to prevent liquid leakage.

[0043] Similarly, a second through hole is opened on the side wall of the distillation tower body 1, and the second through hole is rotatably connected to the main shaft end of the first motor 11 through a second waterproof bearing to prevent liquid leakage.

[0044] Furthermore, the mounting bracket 9 is arranged in a cross-shaped structure, and the four ends of the mounting bracket 9 are fixedly connected to the inner wall of the annular frame 8 by welding, and the connection is firm, which is convenient for steam circulation.

[0045] Preferably, the mounting bracket 9 is also provided with a plurality of arc-shaped rods, and the arc-shaped rods are arranged on the mounting bracket 9 to form an annular frame 8 for fixing the cleaning rods 10, so that the plurality of cleaning rods 10 and the plurality of vents 7 are arranged in an annular shape.

[0046] The vent holes 7 arranged in an annular manner are evenly vented, and more vent holes can be arranged to improve venting efficiency. The arc rod is set on the mounting bracket 9 to install the cleaning rod 10, and each vent hole can be cleaned in time.

[0047] Specifically, a control switch 20 is fixedly connected to the front side wall of the distillation tower body 1, and the control switch 20 is electrically connected to the electromagnetic heating tube 5, the stirring device and the reciprocating lifting mechanism, respectively, which means that the first motor 11 and the second motor 18 are electrically connected to the control switch 20, which is easy to operate and has an external power supply. The circuit involved is a prior art and can be fully implemented by those skilled in the art without further elaboration.

[0048] When the device is used to rectify the raw materials in the production process of monoalkyl methylphosphinate, various raw materials for processing monoalkyl methylphosphinate are added from the feed valve port 2, and the electromagnetic heating tube 5 is powered on for heating, and the temperature is maintained at 105-120° C. At the same time, the second motor 18 is started to drive the stirring rod 19 to rotate, and the methylphosphorous acid, ROH and catalyst in the rectification tower body 1 are fully mixed to improve the reaction effect, and the steam rises from the vent hole 7 and is discharged from the outlet valve port 3, and the overflow generated by the reaction is blocked by the anti-overflow plate 6, which plays a role in preventing overflow.

[0049] When the vent hole 7 on the anti-overflow plate 6 needs to be cleaned, the first motor 11 is started to drive the cam 12 to rotate, because the cam 12 is hingedly connected to the pull rod 131. At this time, the pull rod 13 swings and moves, and the annular frame 8 can be pulled to move up and down reciprocatingly, so that the mounting bracket 9 is repeatedly inserted into the vent hole 7 for cleaning operations, which is convenient for cleaning, ensures the steam circulation effect, and further ensures the distillation processing efficiency of methyl phosphinate. When the annular frame 8 is displaced, the sliding sleeve 16 fixed to the L-shaped rod 17 is driven to move on the positioning rod 15, which can play a positioning and guiding role in the displacement of the annular frame 8, and ensure the straight up and down displacement of the annular frame 8.

[0050] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A distillation device for monoalkyl methylphosphinate, characterized in that: include: A distillation tower body, wherein the middle of the side wall of the distillation tower body is connected to a feed valve port, the top wall of the distillation tower body is connected to a gas outlet valve port, and the bottom of the distillation tower body is connected to a discharge valve port; An electromagnetic heating tube is fixed on the inner bottom wall of the distillation tower body; A stirring device is arranged at the lower part of the distillation tower body; an anti-overflow plate, arranged in the distillation tower body and located above the feed valve port, the anti-overflow plate being provided with a plurality of vent holes evenly spaced apart; and, The cleaning device comprises an annular frame, a mounting bracket, a plurality of cleaning rods and a reciprocating lifting mechanism, wherein the annular frame is slidably arranged on the upper side wall of the distillation tower body in an up-and-down direction, the mounting bracket is fixed to the middle of the annular frame, one end of a plurality of cleaning rods is fixed to the lower end of the mounting bracket, and the plurality of cleaning rods are arranged in a one-to-one correspondence with the plurality of vents, and the reciprocating lifting mechanism is connected to the annular frame for driving the annular frame to move up and down.

2. A distillation device for monoalkyl methylphosphinate according to claim 1, characterized in that: The reciprocating lifting mechanism comprises: A first motor is fixed on a side wall of the distillation tower body, and a main shaft end of the first motor penetrates into the distillation tower body; A cam, one end of which is fixed to the main shaft end of the first motor; A pull rod, the upper end of which is hinged to an end of the cam away from its rotation center, and the lower end of which is hinged to the upper side wall of the annular frame.

3. A distillation device for monoalkyl methylphosphinate according to claim 1, characterized in that: The cleaning device also includes a positioning and guiding mechanism, and the positioning and guiding mechanism includes: A concave plate is fixed on the inner wall of the distillation tower body, and the notch on the concave plate is arranged toward the inner cavity of the distillation tower body; Positioning rods, fixed on the upper and lower inner walls of the concave plate; A sliding sleeve, sleeved on the positioning rod; An L-shaped rod has one end fixed to one side of the sliding sleeve and the other end fixedly connected to the annular frame.

4. A distillation device for monoalkyl methylphosphinate according to claim 1, characterized in that: The stirring device includes a second motor and a stirring rod group. The second motor is fixed on the bottom wall of the distillation tower body. The main shaft end of the second motor passes through the distillation tower body and is connected to the stirring rod group. The stirring rod group is provided with a plurality of stirring rods.

5. A distillation device for monoalkyl methylphosphinate according to claim 4, characterized in that: A first through hole is provided on the bottom wall of the distillation tower body, and the first through hole is rotatably connected to the main shaft end of the second motor through a first waterproof bearing.

6. A distillation device for monoalkyl methylphosphinate according to claim 2, characterized in that: A second through hole is provided on the side wall of the distillation tower body, and the second through hole is rotatably connected to the main shaft end of the first motor through a second waterproof bearing.

7. A distillation device for monoalkyl methylphosphinate according to claim 1, characterized in that: The mounting bracket is arranged in a cross-shaped structure, and the four ends of the mounting bracket are fixedly connected to the inner wall of the annular frame by welding.

8. A distillation device for monoalkyl methylphosphinate according to claim 7, characterized in that: The mounting bracket is also provided with a plurality of arc-shaped rods, which are arranged on the mounting bracket to form an annular frame for fixing the cleaning rods, so that the plurality of cleaning rods and the plurality of vents are arranged in an annular shape.

9. A distillation device for monoalkyl methylphosphinate according to claim 1, characterized in that: A control switch is fixedly connected to the front side wall of the distillation tower body, and the control switch is electrically connected to the electromagnetic heating tube, the stirring device and the reciprocating lifting mechanism respectively.

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