A distillation device for producing methyl anthranilate

Abstract

The utility model relates to a distillation device for methyl anthranilate production belongs to distillation equipment technical field, including distillation column, heating box, heater, steam outlet pipe, condenser, a plurality of support filter plates are fixed in the distillation column, the top of support filter plate is equipped with the filler layer, the top of intermediate filler layer is equipped with liquid inlet pipe, the condenser includes condensing box, and the condensing box is connected with inlet steam pipe and outlet steam pipe, and the inlet steam pipe is connected with the steam outlet pipe between the flow guide pipe, and the outer end of flow guide pipe is spirally wound with cooling air pipe, a plurality of liquid discharge pipes are equipped at the bottom of condensing box, and the liquid discharge pipe close to inlet steam pipe is connected with the return pipe, and the other end of return pipe is connected to the upper part of the uppermost filler layer, the utility model makes methyl anthranilate and other impurities more fully separate, has improved distillation efficiency significantly, first utilizes the air cooling to carry out the preliminary cooling to steam, reduces the load of water cooling system, promotes the purity, and the tower top temperature will not cause the sudden drop when refluxing, influences the distillation effect.

Description

Technical Field

[0001] This utility model belongs to the field of distillation equipment technology, specifically relating to a distillation apparatus for the production of methyl anthranilate. Background Technology

[0002] During the esterification reaction, the vapor generated in the esterification reactor needs to be condensed into a liquid by a condenser for subsequent processing and separation. For example, during the esterification reaction of methyl anthranilate, unreacted methanol vapor is produced. The condenser uses a shell-and-tube structure to achieve heat exchange, condensing the gaseous substance into a liquid state for easy collection and separation. The uncondensed gas is discharged through a top pipe to avoid pressure buildup. Existing esterification reactor condensers have several problems in use: firstly, the gas stays in the condenser for a short time, affecting the condensation effect; secondly, the large amount of heat energy released during steam condensation is not effectively utilized, resulting in energy waste and increased production costs. Utility Model Content

[0003] Therefore, it is necessary to provide a distillation apparatus for the production of methyl anthranilate, addressing the existing technical problems.

[0004] To solve the problems of the existing technology, the technical solution adopted by this utility model is as follows:

[0005] A distillation apparatus for the production of methyl anthranilate includes a distillation column, a heating box at the bottom of the distillation column containing a heater, a steam outlet pipe at the top of the distillation column connected to a condenser, multiple support filter plates fixed inside the distillation column, a packing layer above the support filter plates, an inlet pipe above the middle packing layer, a condenser including a condensation box connected to a steam inlet pipe and a steam outlet pipe, a guide pipe connected between the steam inlet pipe and the steam outlet pipe, a cooling air duct spirally wound around the outer end of the guide pipe, multiple drain pipes at the bottom of the condensation box, a reflux pipe connected to the drain pipe near the steam inlet pipe, and the other end of the reflux pipe connected to the upper part of the uppermost packing layer.

[0006] As a preferred embodiment, the condenser is equipped with multiple baffles fixed vertically and vertically between the steam inlet pipe and the steam outlet pipe, allowing the steam entering the condenser to flow in a serpentine pattern. The drain pipe is located between adjacent bottom baffles or between the bottom baffles and the side wall of the condenser, allowing for segmented collection of condensate. The first segment contains methyl anthranilate condensate at a higher temperature, the middle segment contains methyl anthranilate condensate at a moderate temperature, and the last segment contains methyl anthranilate condensate at a lower temperature with low-boiling impurities, facilitating subsequent processing. The condenser is equipped with multiple serpentinely arranged cooling coils, with one end of the cooling coil connected to a cooling water inlet pipe and the other end connected to a cooling water outlet pipe.

[0007] As a preferred option, the guide pipe is set at an angle, with one end of the guide pipe connected to the steam outlet pipe being higher than the other end, so that the condensate after air cooling can be discharged into the condensation box for collection.

[0008] As a preferred option, both the inlet pipe and the return pipe are connected to a distributor to facilitate the uniform distribution of the incoming and returning liquids.

[0009] As a preferred embodiment, the heater includes an installation port located on one side of the bottom of the heating chamber. The installation port is connected to a liquid distribution end via a flange. An orifice plate is connected between the liquid distribution end and the installation port. A partition plate is fixed in the middle of the liquid distribution end, dividing it into upper and lower areas. The upper and lower parts of the orifice plate are respectively provided with multiple heating inlet pipes and heating return pipes. The upper and lower corresponding heating inlet pipes and heating return pipes are connected by a liquid delivery bend. A heating agent outlet pipe and a heating agent inlet pipe are respectively connected to the top and bottom of the liquid distribution end. A temperature sensor is provided inside the heating chamber. The liquid distribution end and the orifice plate can be easily disassembled, thereby disassembling the heating inlet pipes and heating return pipes for cleaning or replacement.

[0010] As a preferred embodiment, a support rod is fixed in the middle of the orifice plate, and multiple fixing plates are fixed along the axial direction of the support rod. The heating inlet pipe and the heating return pipe are supported in the holes of the fixing plates, which increases the support strength of the heating inlet pipe and the heating return pipe and prevents breakage.

[0011] As a preferred option, a drain pipe is fixed at the bottom of the heating box to facilitate the discharge of residual liquid.

[0012] As a preferred option, the distillation column and heating box are wrapped with an insulation layer made of nano-aerogel insulation material, which improves the insulation effect and saves more energy.

[0013] The advantages of this utility model compared with the prior art are:

[0014] By setting a packing layer inside the distillation column, the gas-liquid contact area is increased, the gas-liquid mass transfer efficiency is improved, and methyl anthranilate is more fully separated from other impurities, significantly improving the distillation efficiency. The condenser adopts a combination of air cooling and water cooling. First, air cooling is used to initially cool the steam, reducing the load on the water cooling system. Then, water cooling is used to further condense the steam into liquid. The condensate generated by air cooling and the condensate generated at the front of water cooling are refluxed to improve purity. Furthermore, the temperature of the condensate at the front is close to the temperature of the gas phase at the top of the column, so the reflux will not cause a sudden drop in the temperature at the top of the column, which would affect the distillation effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 yes Figure 1 Partial structural diagram Figure 1 ;

[0017] Figure 3 yes Figure 1 Partial structural diagram Figure 2 ;

[0018] Figure 4 yes Figure 1 Partial structural diagram Figure 3 ;

[0019] The numbers on the map are:

[0020] 1. Distillation column; 2. Heating chamber; 3. Heater; 31. Heating inlet pipe; 32. Liquid delivery bend pipe; 33. Support rod; 34. Orifice plate; 35. Heating agent inlet pipe; 36. Divider plate; 37. Liquid distribution end; 38. Fixing plate; 39. Heating return pipe; 4. Packing layer; 5. Support filter plate; 6. Distributor; 7. Liquid inlet pipe; 8. Steam outlet pipe; 9. Return pipe; 10. Guide pipe; 11. Cooling air duct; 12. Cooling water outlet pipe; 13. Cooling coil; 14. Condenser; 15. Steam outlet pipe; 16. Steam inlet pipe; 17. Baffle plate; 18. Drain pipe; 19. Cooling water inlet pipe; 20. Liquid discharge pipe. Detailed Implementation

[0021] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0022] Example 1, Reference Figures 1 to 4 A distillation apparatus for the production of methyl anthranilate includes a distillation column 1, a heating box 2 at the bottom of the distillation column 1, a heater 3 inside the heating box 2, a steam outlet pipe 8 at the top of the distillation column 1, the steam outlet pipe 8 being connected to a condenser, multiple support filter plates 5 fixed inside the distillation column 1, a packing layer 4 above the support filter plates 5, a liquid inlet pipe 7 above the middle packing layer 4, the condenser including a condensation box 14, the condensation box 14 being connected to a steam inlet pipe 16 and a steam outlet pipe 15, a guide pipe 10 connecting the steam inlet pipe 16 and the steam outlet pipe 8, a cooling air duct 11 spirally wound around the outer end of the guide pipe 10, multiple drain pipes 18 at the bottom of the condensation box 14, a reflux pipe 9 connected to the drain pipe 18 near the steam inlet pipe 16, and the other end of the reflux pipe 9 being connected to the upper part of the uppermost packing layer 4.

[0023] During operation, a mixture containing methyl anthranilate is fed into the middle region of distillation column 1 through inlet pipe 7. Heater 3 heats the liquid at the bottom of heating box 2, causing it to boil and generate rising steam. The steam rises in distillation column 1 and undergoes sufficient gas-liquid mass transfer with the liquid (including reflux liquid and feed liquid) on packing layer 4. Methyl anthranilate gradually separates from other impurities. The steam generated at the top of distillation column 1 enters guide pipe 10 from steam outlet pipe 8. It is first cooled by air through cooling duct 11 and then further condensed into liquid by water cooling in condenser box 14. The latter part of the condensate is collected as product, while the former part of the condensate with higher temperature flows back to the packing layer 4 at the top of distillation column 1 through reflux pipe 9 for reflux re-distillation.

[0024] In Example 2, based on Example 1, the condenser 14 has multiple baffles 17 fixed vertically and vertically between the steam inlet pipe 16 and the steam outlet pipe 15. The drain pipe 18 is located between adjacent bottom baffles 17 or between the bottom baffles 17 and the side wall of the condenser 14. The condenser 14 contains multiple serpentine cooling coils 13, one end of which is connected to a cooling water inlet pipe 19, and the other end to a cooling water outlet pipe 12. During condensation, cooling water enters from the cooling water inlet pipe 19 on the right, then flows serpentinely within the cooling coils 13, exchanging heat with the steam in the condenser 14 to condense the steam, and finally discharges from the cooling water outlet pipe 12.

[0025] The guide pipe 10 is set at an angle, with one end of the guide pipe 10 connected to the steam outlet pipe 8 being higher than the other end. In this way, the condensate after air cooling will flow along the guide pipe 10 to the front of the condenser box 14, and then flow back through the reflux pipe 9 to the packing layer 4 at the top of the distillation column 1 for reflux re-distillation.

[0026] Both the inlet pipe 7 and the return pipe 9 are connected to a distributor 6 at their inner ends. The steam outlet pipe 15 is connected to a vacuum pump, such as a vacuum pump. A pressure gauge is installed at the top of the distillation column 1, which can maintain a low-pressure state inside the distillation column 1 through suction.

[0027] The heater 3 includes an installation port located on one side of the bottom of the heating chamber 2. A liquid distribution end 37 is connected to the installation port via a flange. An orifice plate 34 connects the liquid distribution end 37 to the installation port. A partition plate 36, dividing the liquid distribution end 37 into upper and lower sections, is fixed in the middle of the liquid distribution end 37. A sealing gasket is provided between the partition plate 36 and the orifice plate 34. Multiple heating inlet pipes 31 and heating return pipes 39 are respectively provided on the upper and lower sections of the orifice plate 34. The corresponding upper and lower heating inlet pipes 31 and heating return pipes 39 are connected via a liquid delivery bend 32. A heating agent outlet pipe and a heating agent inlet pipe 35 are respectively connected to the top and bottom of the liquid distribution end 37. A sealing ring is provided at the connection between the orifice plate 34, the liquid distribution end 37, and the installation port. An insulation layer covers the outside of the orifice plate 34. A temperature sensor is installed inside the heating chamber 2. The heating agent outlet pipe and the heating agent inlet pipe 35 are connected to a thermal oil heater. The heating temperature is controlled by controlling the power of the thermal oil heater; this is prior art and will not be described in detail here.

[0028] A support rod 33 is fixed in the middle of the perforated plate 34, and multiple fixing plates 38 are fixed along its axial direction on the support rod 33. The heating inlet pipe 31 and the heating return pipe 39 are supported in the plate holes of the fixing plates 38.

[0029] The bottom of the heating box 2 is fixed with a drain pipe 20. When it is necessary to drain the residual impurity liquid after distillation, the valve on the drain pipe 20 can be opened to drain the impurity liquid.

[0030] The exterior of the distillation column 1 and the heating box 2 is covered with an insulation layer made of nano-aerogel insulation material.

[0031] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A distillation apparatus for the production of methyl anthranilate, comprising a distillation column (1), a heating box (2) at the bottom of the distillation column (1), a heater (3) inside the heating box (2), and a steam outlet pipe (8) at the top of the distillation column (1), the steam outlet pipe (8) being connected to a condenser, characterized in that: The distillation column (1) is fixed with multiple support filter plates (5). A packing layer (4) is provided above the support filter plates (5). An inlet pipe (7) is provided above the middle packing layer (4). The condenser includes a condenser box (14). The condenser box (14) is connected to a steam inlet pipe (16) and a steam outlet pipe (15). A guide pipe (10) is connected between the steam inlet pipe (16) and the steam outlet pipe (8). A cooling air duct (11) is spirally wound around the outer end of the guide pipe (10). Multiple drain pipes (18) are provided at the bottom of the condenser box (14). A return pipe (9) is connected to the drain pipe (18) near the steam inlet pipe (16). The other end of the return pipe (9) is connected to the upper part of the top packing layer (4).

2. The distillation apparatus for producing methyl anthranilate according to claim 1, characterized in that, The condenser (14) has multiple baffles (17) fixed vertically between the steam inlet pipe (16) and the steam outlet pipe (15). The drain pipe (18) is located between adjacent bottom baffles (17) or between the bottom baffles (17) and the side wall of the condenser (14). The condenser (14) is equipped with multiple serpentine cooling coils (13). One end of the cooling coil (13) is connected to the cooling water inlet pipe (19), and the other end is connected to the cooling water outlet pipe (12).

3. The distillation apparatus for producing methyl anthranilate according to claim 1, characterized in that, The guide pipe (10) is set at an angle, and one end of the guide pipe (10) connected to the steam outlet pipe (8) is higher than the other end.

4. The distillation apparatus for producing methyl anthranilate according to claim 3, characterized in that, The inner ends of the inlet pipe (7) and the return pipe (9) are both connected to a distributor (6).

5. The distillation apparatus for producing methyl anthranilate according to claim 1, characterized in that, The heater (3) includes an installation port located on one side of the bottom of the heating box (2). The installation port is connected to a liquid distribution end (37) via a flange. An orifice plate (34) is connected between the liquid distribution end (37) and the installation port. A partition plate (36) is fixed in the middle of the liquid distribution end (37) to divide it into upper and lower areas. Multiple heating inlet pipes (31) and heating return pipes (39) are respectively provided on the upper and lower parts of the orifice plate (34). The upper and lower corresponding heating inlet pipes (31) and heating return pipes (39) are connected via a liquid delivery bend (32). A heating agent outlet pipe and a heating agent inlet pipe (35) are respectively connected to the top and bottom of the liquid distribution end (37). A temperature sensor is provided inside the heating box (2).

6. The distillation apparatus for producing methyl anthranilate according to claim 5, characterized in that, A support rod (33) is fixed in the middle of the orifice plate (34), and multiple fixing plates (38) are fixed along its axial direction on the support rod (33). The heating inlet pipe (31) and the heating return pipe (39) are supported in the plate holes of the fixing plates (38).

7. The distillation apparatus for producing methyl anthranilate according to claim 1, characterized in that, A drain pipe (20) is fixed at the bottom of the heating box (2).

8. The distillation apparatus for producing methyl anthranilate according to claim 1, characterized in that, The distillation column (1) and the heating box (2) are covered with an insulation layer, which is made of nano-aerogel insulation material.

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