Low-vacuum rectifying tower for methylthiopropionaldehyde

Abstract

The utility model discloses a low vacuum rectifying tower for methylthiopropionaldehyde, which is characterized in that a filler box and a filler net are arranged in a limited space, segmented fillers are combined into a filler pile to prolong the mass transfer and heat transfer time of gas and liquid, meanwhile, the filler net can be taken out from the filler box, the fillers are placed in the filler net, and when the fillers need to be replaced, the filler pile can be taken out from the filler box. When the packing box is used, the packing net is taken out, then the packing net filled with the packing in advance is placed into the packing box, the packing can be replaced, the environment in the packing box can be changed into a low-vacuum environment through an external vacuum pump, the boiling point of substances is lowered, low-boiling-point components are evaporated more easily, and therefore the separation effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical separation, in particular to a low vacuum distillation tower for methylthiopropionaldehyde. Background Art

[0002] Distillation is a key step in the production and purification of methylthiopropionaldehyde. Traditional packed distillation towers are often complex and time-consuming to replace, and the process can cause damage to the tower, impacting the equipment's service life and production efficiency. Furthermore, for heat-sensitive substances like methylthiopropionaldehyde, distillation must be performed under low vacuum conditions to lower its boiling point, reduce energy consumption, and prevent product decomposition. Utility Model Content

[0003] The purpose of the utility model is to provide a low vacuum distillation tower for methylthiopropionaldehyde, which can realize simple and safe replacement of fillers.

[0004] In order to solve the above technical problems, the present invention adopts the following solutions:

[0005] A low vacuum distillation tower for methylthiopropionaldehyde comprises a distillation tower body, a carrying plate is installed near the bottom of the distillation tower body, two fixing blocks are provided on the upper surface of the carrying plate, a stuffing box is installed between the two fixing blocks, and the stuffing box comprises a stuffing box body and a stuffing box cover;

[0006] A liquid outlet is provided at the bottom of the stuffing box, an air inlet is provided on the side of the stuffing box just above the fixed block, a stuffing net is placed in the stuffing box, and liquid inlets are provided on both the left and right sides above the stuffing net. A nozzle is installed at the liquid inlet position in the stuffing box;

[0007] A hollow threaded cylinder is provided on the lower surface of the stuffing box cover. The stuffing box cover is installed with an air pump connecting pipe and an exhaust connecting pipe that vertically penetrate the cover surface and enter the hollow threaded cylinder. The air pump connecting pipe and the exhaust connecting pipe both pass through the distillation tower cover. An air pressure sensor and a temperature sensor are installed on the lower surface of the stuffing box cover within the range of the hollow threaded cylinder. A breathable layer is installed between the hollow threaded cylinders below the air pressure sensor and the temperature sensor.

[0008] The air pressure in the stuffing box is reduced by connecting the vacuum pump through the air pump connecting pipe to reach a low vacuum state, thereby reducing the boiling points of various substances and making volatile substances more easily volatilized. The stuffing box is used as a place for material distillation, and the stuffing net is used as a carrier for carrying the stuffing. The distillation place and the stuffing carrier are separated to facilitate the replacement of the stuffing. At the same time, the segmented stuffing is combined into a long section of stuffing in a limited space to increase the contact time between steam and methylthiopropionaldehyde.

[0009] Further,

[0010] The height of the filler net is lower than that of the filler box, and the filler net is a mesh structure.

[0011] Further,

[0012] The air inlet, liquid inlet and liquid outlet are all sealed and connected to the pipeline, and the pipeline passes through the distillation tower body and is connected to other equipment. A filter layer is set at the connection between the liquid outlet, liquid inlet and the pipeline, and a breathable layer is set at the connection between the air inlet and the pipeline.

[0013] Further,

[0014] The breathable layer is made of a material that allows gas and water vapor to pass through but does not allow liquid to pass through and does not react with methylthiopropionaldehyde.

[0015] Further,

[0016] The supporting plate is further provided with holes between the fixing blocks, through which a pipe connected to the liquid outlet can pass.

[0017] Further,

[0018] The distance between the fixing blocks is equal to the width of the stuffing box.

[0019] Further,

[0020] The distillation tower cover is provided with small holes for the air pump connecting pipe and the exhaust connecting pipe to pass through.

[0021] Further,

[0022] A receiving display is also installed on the side of the distillation tower body.

[0023] The utility model has the beneficial effects:

[0024] 1. The air pressure in the stuffing box is reduced by connecting an external vacuum pump through the air pump tube to achieve a low vacuum state. The low vacuum operation reduces the boiling point of the substance, making it easier for low-boiling-point components to evaporate, thereby improving the separation effect and avoiding the decomposition of the heat-sensitive substance methylthiopropionaldehyde at high temperatures, thereby improving product quality.

[0025] 2. By placing the filler in the filler net, when the filler needs to be removed, only the filler net needs to be quickly taken out of the filler box to remove the filler, which optimizes the steps of removing the filler from the distillation tower, speeds up the entire material replacement process, and saves time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the utility model;

[0027] Figure 2 This is a front sectional view of the stuffing box cover;

[0028] Figure 3 This is a top view of the stuffing box;

[0029] Figure 4 This is the front view of the stuffing box;

[0030] Figure 5 is a top view of the load-bearing plate;

[0031] The following are the descriptions of the reference numerals:

[0032] Distillation tower body-1, carrying plate-2, fixing block-20, stuffing box-3, stuffing box body-30, liquid outlet-301, air inlet-302, liquid inlet-303, stuffing box cover-31, air pump connecting pipe-310, exhaust connecting pipe-311, stuffing net-32, air pressure sensor-33, temperature sensor-34, hollow threaded cylinder-35, filter layer-4, air permeable layer-5, 6-receiving display. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "opened," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] Example

[0037] See also Figures 1 to 5 :

[0038] A low vacuum distillation tower for methylthiopropionaldehyde comprises a distillation tower body 1, wherein a support plate 2 is installed near the bottom of the distillation tower body 1, and two fixing blocks 20 are provided on the upper surface of the support plate 2. A stuffing box 3 is installed between the two fixing blocks 20, and the stuffing box 3 comprises a stuffing box body 30 and a stuffing box cover 31;

[0039] A liquid outlet 301 is provided at the bottom of the stuffing box 30. An air inlet 302 is provided on the side of the stuffing box 30 immediately above the fixed block 20. A stuffing net 32 is placed inside the stuffing box 30. Liquid inlets 303 are provided on both the left and right sides of the stuffing box 30 above the stuffing net 32. A nozzle 41 is installed at the position of the liquid inlet 303 in the stuffing box 30.

[0040] A hollow threaded cylinder 35 is provided on the lower surface of the stuffing box cover 31. The stuffing box cover 31 is installed with an air pump connecting pipe 310 and an exhaust connecting pipe 311 that vertically penetrate the cover surface and enter the hollow threaded cylinder 35. The air pump connecting pipe 310 and the exhaust connecting pipe 311 both pass through the distillation tower cover 10. An air pressure sensor 33 and a temperature sensor 34 are installed on the lower surface of the stuffing box cover 31 within the range of the hollow threaded cylinder 35. A breathable layer 5 is installed between the hollow threaded cylinder 35 below the air pressure sensor 33 and the temperature sensor 34.

[0041] The utility model installs an air pump connecting pipe 310 and connects an external vacuum pump through a pipeline, so that the environment in the stuffing box 30 reaches a low vacuum environment, thereby reducing the boiling point temperature of methylthiopropionaldehyde by reducing the pressure, saving energy during processing, and at the same time, a liquid inlet 303 and a nozzle 41 are provided on the left and right sides of the stuffing box 30. The two nozzles 41 can enable the liquid to be sprinkled on the stuffing in all directions. The air permeable layer 5 arranged between the hollow threaded cylinders 35 can prevent the pressure sensor 33 and the temperature sensor 34 from being soaked in when there is too much liquid, so as to damage the pressure sensor 33 and the temperature sensor 34. There is a stuffing net 32 in the stuffing box 30, and the stuffing net 32 can realize the one-time removal and insertion of the stuffing, saving the time for replacing the stuffing.

[0042] Further,

[0043] The height of the packing net 32 is lower than the packing box 3, and the packing net 32 has a mesh structure. The height of the packing net is lower than the packing box to reserve space for the nozzle 41 at the liquid inlet 303, so that the nozzle 41 has space for spraying. The mesh structure is designed to both hold the packing and enable gas and liquid to circulate between the packing net 32 and the packing box 3.

[0044] Further,

[0045] The air inlet 302, the liquid inlet 303, and the liquid outlet 301 are all sealed and connected to the pipeline, and the pipeline passes through the distillation tower body 1 and is connected to other equipment. A filter layer 4 is set at the connection between the liquid outlet 301, the liquid inlet 303 and the pipeline, and a breathable layer 5 is set at the connection between the air inlet 302 and the pipeline. The filter layer 4 at the liquid inlet 303 can prevent the nozzle 41 from being blocked by impurities in the liquid. The filter layer 4 at the liquid outlet 301 filters the treated liquid, and the breathable layer 5 at the air inlet 302 can prevent the liquid from flowing out of the air inlet 302 from top to bottom.

[0046] Further,

[0047] The breathable layer 5 is made of a material that allows gas and water vapor to pass through but does not allow liquid to pass through and does not react with methylthiopropionaldehyde.

[0048] Further,

[0049] The supporting plate 2 further defines holes 21 between the fixing blocks 20 for allowing a pipe connected to the liquid outlet 301 to pass through.

[0050] Further,

[0051] The distance between the fixing blocks 20 is equal to the width of the stuffing box body 30 , which facilitates positioning and fixing of the stuffing box 3 during installation.

[0052] Further,

[0053] The distillation tower cover 10 is provided with small holes for the air pump connecting pipe 310 and the exhaust connecting pipe 311 to pass through.

[0054] Further,

[0055] A receiving display 6 is also installed on the side of the distillation tower body 1. The receiving display 6 can receive the signals transmitted by the air pressure sensor 33 and the temperature sensor 34 and display them on the receiving display 6, so that workers can check and monitor the air pressure and temperature in the stuffing box.

[0056] The usage of this utility model is:

[0057] First, the air pump connecting pipe 310 and the exhaust connecting pipe 311 are connected to the vacuum pump and the collector respectively, the liquid inlet 303 is connected to the device containing methylthiopropionaldehyde, and the air inlet 302 is connected to the reboiler.

[0058] Then, the vacuum pump connected to the air pump connecting pipe 310 is started, and the air in the stuffing box is extracted by the vacuum pump, so that the environment in the stuffing box becomes a low vacuum environment. In the low vacuum environment, the boiling point of the substance solution will be reduced, which reduces the energy required for distillation. At the same time, the reboiler is started to transport steam into the stuffing box 3 from the air inlet. The air pressure sensor 33 and the temperature sensor 34 monitor the air pressure and temperature in the stuffing box 3, and the monitored results are displayed on the receiving display 6. When it is observed that the air pressure and temperature in the stuffing box 3 are within the required air pressure range and temperature range, methylthiopropionaldehyde liquid is transported into the stuffing box 3 through the liquid inlet 303. The methylthiopropionaldehyde liquid is sprinkled on the surface of the packing in all directions through the nozzle 41. Affected by the self-generated gravity of the liquid, the methylthiopropionaldehyde liquid flows through the packing from top to bottom to form a liquid film, and the steam passes through the packing from bottom to top. The steam and the methylthiopropionaldehyde liquid are in close contact with each other in the packing layer, and mass and heat are transferred. The components with higher volatility will evaporate at a lower temperature, while the components with lower volatility will remain in the packing layer and continue to transfer mass with the steam. Finally, the light components enter the collector through the pipeline connection from the exhaust connecting pipe 311, and the heavy component methylthiopropionaldehyde enters the collector through the liquid outlet 301 connected to the pipeline.

[0059] When the filler needs to be replaced, it is only necessary to take out the filler net 32 from the filler box 30 and put another filler net 32 filled with new filler in advance into the filler box 30 .

[0060] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Based on the technical essence of the present invention and within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement of the above embodiment shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A low vacuum distillation tower for methylthiopropionaldehyde, comprising a distillation tower body (1), characterized in that: A supporting plate (2) is installed near the bottom of the distillation tower body (1); two fixing blocks (20) are provided on the upper surface of the supporting plate (2); a stuffing box (3) is installed between the two fixing blocks (20); and the stuffing box (3) includes a stuffing box body (30) and a stuffing box cover (31); The stuffing box (30) has a liquid outlet (301) at its bottom, an air inlet (302) at a side of the stuffing box (30) immediately above the fixed block (20), a stuffing net (32) is placed in the stuffing box (30), and the stuffing box (30) has liquid inlets (303) on both left and right sides above the stuffing net (32), and a nozzle (41) is installed at the position of the liquid inlet (303) in the stuffing box (30); A hollow threaded cylinder (35) is provided on the lower surface of the stuffing box cover (31). An air pump connecting pipe (310) and an exhaust connecting pipe (311) are installed on the stuffing box cover (31) and vertically penetrate the cover surface and enter the hollow threaded cylinder (35). The air pump connecting pipe (310) and the exhaust connecting pipe (311) both pass through the distillation tower cover (10). An air pressure sensor (33) and a temperature sensor (34) are installed on the lower surface of the stuffing box cover (31) within the range of the hollow threaded cylinder (35). A gas permeable layer (5) is installed between the hollow threaded cylinder (35) below the air pressure sensor (33) and the temperature sensor (34).

2. The low vacuum distillation column of methylthiopropionaldehyde according to claim 1, characterized in that The height of the stuffing net (32) is lower than that of the stuffing box (3), and the stuffing net (32) is a mesh structure.

3. The low vacuum distillation column of methylthiopropionaldehyde according to claim 1, characterized in that The air inlet (302), the liquid inlet (303), and the liquid outlet (301) are all sealedly connected to the pipeline, and the pipeline passes through the distillation tower body (1) and is connected to other equipment. A filter layer (4) is provided at the connection between the liquid outlet (301), the liquid inlet (303) and the pipeline, and a breathable layer (5) is provided at the connection between the air inlet (302) and the pipeline.

4. The low vacuum distillation column for methylthiopropionaldehyde according to claim 1, characterized in that The breathable layer (5) is made of a material that allows gas and water vapor to pass through but prevents liquid from passing through and does not react with methylthiopropionaldehyde.

5. The low vacuum distillation column for methylthiopropionaldehyde according to claim 1, characterized in that The carrier plate (2) is further provided with holes (21) between the fixing blocks (20) through which a pipe connected to the liquid outlet (301) can pass.

6. The low vacuum distillation column for methylthiopropionaldehyde according to claim 1, characterized in that The distance between the fixing blocks (20) is equal to the width of the stuffing box (30).

7. The low vacuum distillation column for methylthiopropionaldehyde according to claim 1, characterized in that The distillation tower cover (10) is provided with small holes through which the air pump connecting pipe (310) and the exhaust connecting pipe (311) can pass.

8. The low vacuum distillation column for methylthiopropionaldehyde according to claim 1, characterized in that The distillation tower body (1) is also provided with a receiving display (6) on the side.

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