A high-efficiency rectification device for trioxymethylene in a polyformaldehyde production device

Abstract

The present application relates to rectification system technical field, and disclose a kind of polyformaldehyde production device process in trimethylaldehyde high-efficiency rectification equipment, the polyformaldehyde production device process in trimethylaldehyde high-efficiency rectification equipment, including heating cylinder, the heating cylinder is provided with rectification assembly, the rectification assembly includes primary heating equipment.The polyformaldehyde production device process in trimethylaldehyde high-efficiency rectification equipment, to make the device adapt to the demand of polyformaldehyde production to trimethylaldehyde high-precision purification, by setting rectification assembly, the component cooperation primary heating equipment is preheated to heating cylinder inner material by spiral heat pipe, increase heat exchange area and improve preheating efficiency, material is entered rectification tower after entering inclined cylinder, the multiple straight heat pipes of secondary heating equipment are heated, cooperate spiral guide vane and extend the residence time of material in tower, let gas-liquid two-phase contact mass transfer, condenser and condenser fractional condensation, realize trimethylaldehyde and impurity accurate separation.

Description

Technical Field

[0001] This invention relates to the field of distillation system technology, specifically to a high-efficiency trioxymethylene distillation device in the process of polyoxymethylene production. Background Technology

[0002] The high-efficiency trioxymethylene distillation equipment is the core separation equipment in the field of polyoxymethylene production. Its core function is to accurately purify and separate the crude trioxymethylene generated in the production of polyoxymethylene, remove impurities such as water, formaldehyde, and methylal from the system, and obtain high-purity trioxymethylene monomer.

[0003] Existing high-efficiency trioxymethylene distillation equipment mainly involves feeding crude trioxymethylene into the distillation column through the feed inlet. The gas-liquid two-phase efficient mass transfer separation is achieved through the floating valve trays inside the column. Light component impurities are distilled off from the top of the column, and the crude feed from the bottom of the column enters the reboiler for heating and vaporization before being refluxed back into the column. After multiple distillations, high-purity trioxymethylene is obtained from the bottom of the column. The floating valve trays adaptively adjust the ventilation area, and the microstructure of the reboiler enhances heat transfer and anti-fouling. The two work together to achieve low resistance drop and high-efficiency distillation.

[0004] However, the above-mentioned equipment has certain shortcomings in use. Traditional distillation columns mostly use sieve plates and ordinary bubble cap trays, with a single gas-liquid contact form, small interphase contact area and short residence time, which makes it difficult to break the complex azeotropic equilibrium of the trioxymethylene-water-formaldehyde system, resulting in a sharp increase in equipment cost and energy consumption. In view of this, we propose a high-efficiency trioxymethylene distillation equipment in the process of polyoxymethylene production. Summary of the Invention

[0005] The purpose of this invention is to provide a high-efficiency trioxymethylene distillation device for the production of polyoxymethylene, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A high-efficiency trioxymethylene distillation device for the production of polyoxymethylene includes a heating cylinder, a feed pipe fixedly installed on the heating cylinder, a distillation assembly provided on the heating cylinder, the distillation assembly including a primary heating device, the primary heating device being fixedly installed on the heating cylinder, and a spiral heat-conducting pipe being fixedly installed on the primary heating device; A conical cylinder is fixedly installed on the heating cylinder, an inclined cylinder is fixedly installed on one end of the conical cylinder, a condenser is fixedly installed on the inclined cylinder, a distillation column is fixedly installed on the other end of the inclined cylinder, a secondary heating device is fixedly installed on the distillation column, and multiple sets of straight heat pipes are fixedly installed inside the secondary heating device. A spiral guide plate is fixedly installed inside the distillation column. One end of an inclined connecting pipe is fixedly installed at the top of the distillation column. A condenser is fixedly installed on the inclined connecting pipe. A collection cylinder is fixedly installed at the other end of the inclined connecting pipe.

[0007] In a further embodiment, the spiral heat pipe is disposed inside the heating cylinder, multiple sets of the straight heat pipe are disposed inside the distillation column, the heating cylinder and the distillation column are connected by an inclined cylinder, the distillation column and the collecting cylinder are connected by an inclined connecting pipe, and the spiral guide plate is disposed above the connection between the distillation column and the inclined cylinder.

[0008] In a further embodiment, a discharge pipe is fixedly installed at the bottom of the heating cylinder, a discharge pipe is fixedly installed at the bottom of the distillation column, and a conveying pipe is fixedly installed at the bottom of the collecting cylinder.

[0009] In a further embodiment, the distillation column is equipped with an auxiliary material injection pipe, a pressure gauge is fixedly installed on the heating cylinder and the distillation column, a sealing plate is snapped onto the feed pipe, and solenoid valves are fixedly installed on the discharge pipe, outlet pipe and conveying pipe.

[0010] In a further embodiment, a stirring assembly is provided on the heating cylinder and the distillation column. The stirring assembly includes a square plate, which is fixedly installed at the bottom of the distillation column. A bottom motor is fixedly installed on the square plate, and a propeller is fixedly installed at the output end of the bottom motor. A servo motor is fixedly installed on the heating cylinder, and a long rod is fixedly installed at the output end of the servo motor. A triangular support frame is fixedly installed inside the heating cylinder, and a stirring paddle is fixedly installed on the long rod.

[0011] In a further embodiment, multiple sets of the square plate, bottom motor, and propeller are provided, with multiple sets of the square plate, bottom motor, and propeller located at the bottom of the distillation column, and multiple sets of the propeller located below multiple sets of direct heat pipes.

[0012] In a further embodiment, multiple sets of the triangular support frame and stirring paddle are provided, with the stirring paddles positioned at the center of the spiral heat pipe, and the long rod rotatably mounted on the triangular support frame.

[0013] In a further embodiment, the collecting cylinder is provided with an auxiliary component, which includes an arc-shaped filter plate fixedly installed inside the collecting cylinder. A right-angle tube is fixedly installed above the collecting cylinder. A negative pressure device is fixedly installed at one end of the right-angle tube, and a protective filter cylinder is fixedly installed at the other end of the right-angle tube. A conical protective ring is fixedly installed inside the collecting cylinder.

[0014] In a further embodiment, multiple sets of the right-angle tube, negative pressure device, and protective filter cartridge are provided, with the protective filter cartridge located inside the collection cylinder and the negative pressure device located outside the collection cylinder.

[0015] In a further embodiment, the conical protective ring is positioned below the oblique connecting pipe and above the arc-shaped filter plate.

[0016] Compared with the prior art, the present invention provides a high-efficiency trioxymethylene distillation device for the production process of polyoxymethylene, which has the following beneficial effects: 1. The high-efficiency distillation equipment for trioxymethylene in the polyoxymethylene production process is designed to meet the high-precision purification requirements of trioxymethylene production. A distillation component is installed, which, in conjunction with a primary heating device, uses spiral heat pipes to uniformly preheat the material inside the heating cylinder, increasing the heat exchange area and improving preheating efficiency. After the material enters the distillation column through the inclined cylinder, multiple sets of straight heat pipes in the secondary heating device provide supplementary heating. Combined with a spiral guide plate, this extends the residence time of the material in the column, allowing for full contact and mass transfer between the gas and liquid phases. The condenser and condenser perform staged condensation, achieving precise separation of trioxymethylene from impurities.

[0017] 2. In the process of polyoxymethylene production, the trioxymethylene high-efficiency distillation equipment is equipped with a stirring component to ensure the long-term stable operation of the distillation system. This component, in conjunction with a servo motor-driven long rod, drives the stirring paddle to rotate in the center of the spiral heat-conducting pipe, stirring the material in the heating cylinder and avoiding scaling and thermal decomposition caused by uneven local heating. The triangular support frame ensures the stability of the stirring structure. Multiple sets of bottom motors drive the propeller to rotate below the straight heat-conducting pipe, breaking the stagnant state of the liquid layer of the material in the distillation column, enhancing the turbulent mixing of the gas and liquid phases, increasing the gas-liquid contact area, and improving the mass transfer efficiency.

[0018] 3. In the process of this polyoxymethylene production unit, the trioxymethylene high-efficiency distillation equipment is equipped with auxiliary components to improve the separation accuracy and operational stability of the distillation system. These components work in conjunction with the condenser to allow the condensed material to enter the collection cylinder. A conical protective ring guides the material, while an arc-shaped filter plate performs fine filtration to intercept minute impurities and improve product purity. A negative pressure device creates a slight negative pressure in the collection cylinder through a right-angle tube, accelerating the sedimentation and filtration of the material. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a cross-sectional schematic diagram of the heating cylinder structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the heating cylinder of the present invention; Figure 5 This is a partial structural diagram of the present invention; Figure 6 This is a cross-sectional schematic diagram of the distillation column structure of the present invention; Figure 7 This is a schematic diagram of the internal structure of the distillation column of the present invention; Figure 8 This is a cross-sectional schematic diagram of the collecting cylinder structure of the present invention.

[0020] Explanation of icon numbers: 1. Heating cylinder; 2. Feed pipe; 3. Distillation assembly; 31. Primary heating equipment; 32. Spiral heat pipe; 33. Discharge pipe; 34. Conical cylinder; 35. Inclined cylinder; 36. Condenser; 37. Distillation column; 38. Secondary heating equipment; 39. Straight heat pipe; 310. Discharge pipe; 311. Spiral guide plate; 312. Inclined connecting pipe; 313. Condenser; 314. Collection cylinder; 315. Feeding pipe; 41. Auxiliary material injection pipe; 42. Pressure gauge; 43. Sealing plate; 44. Solenoid valve; 5. Mixing assembly; 51. Square plate; 52. Bottom motor; 53. Propeller; 54. Servo motor; 55. Long rod; 56. Triangular support frame; 57. Mixing paddle; 6. Auxiliary components; 61. Arc-shaped filter plate; 62. Right-angle tube; 63. Negative pressure equipment; 64. Protective filter cartridge; 65. Conical protective ring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In this application, the term "above" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is primarily used to better describe this application and its embodiments, and is not intended to limit the indicated device, element, or component to having a specific orientation, or to construct and operate in a specific orientation. Furthermore, the term "above" may also be used in certain circumstances to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0023] Please see Figures 1-8 The present invention provides a technical solution: A high-efficiency distillation system for trioxymethylene in a polyoxymethylene production process includes a heating cylinder 1, on which a feed pipe 2 is fixedly installed.

[0024] In one embodiment of the present invention, a distillation assembly 3 is provided on the heating cylinder 1. The distillation assembly 3 includes a primary heating device 31, which is fixedly installed on the heating cylinder 1. A spiral heat pipe 32 is fixedly installed on the primary heating device 31. A conical cylinder 34 is fixedly installed on the heating cylinder 1. One end of an inclined cylinder 35 is fixedly installed on the conical cylinder 34. A condenser 36 is fixedly installed on the inclined cylinder 35. A distillation column 37 is fixedly installed on the other end of the inclined cylinder 35. A secondary heating device 38 is fixedly installed on the distillation column 37. Multiple sets of straight heat pipes 39 are fixedly installed inside the secondary heating device 38. A spiral guide plate 311 is fixedly installed inside the distillation column 37. One end of an inclined connecting pipe 312 is fixedly installed at the top of the distillation column 37. A condenser 313 is fixedly installed on the inclined connecting pipe 312. The other end of the inclined connecting pipe 312... A collection cylinder 314 is fixedly installed at one end. A spiral heat-conducting pipe 32 is installed inside the heating cylinder 1. Multiple sets of straight heat-conducting pipes 39 are installed inside the distillation column 37. The heating cylinder 1 and the distillation column 37 are connected by an inclined cylinder 35. The distillation column 37 and the collection cylinder 314 are connected by an inclined connecting pipe 312. A spiral guide plate 311 is installed above the connection between the distillation column 37 and the inclined cylinder 35. A discharge pipe 33 is fixedly installed at the bottom of the heating cylinder 1. A discharge pipe 310 is fixedly installed at the bottom of the distillation column 37. A conveying pipe 315 is fixedly installed at the bottom of the collection cylinder 314. An auxiliary material injection pipe 41 is installed on the distillation column 37. A pressure gauge 42 is fixedly installed on the heating cylinder 1 and the distillation column 37. A sealing plate 43 is snapped onto the feed pipe 2. A solenoid valve 44 is fixedly installed on the discharge pipe 33, the discharge pipe 310 and the conveying pipe 315.

[0025] In this embodiment, before production, the sealing plate 43 on the feed pipe 2 is opened, and raw material containing trioxymethylene is injected into the heating cylinder 1. The sealing plate 43 is then closed. Distillation auxiliary reagents are added through the auxiliary material injection pipe 41. Based on the preset system pressure threshold on the pressure gauge 42, the primary heating device 31 is started. The spiral heat pipe 32 evenly releases heat inside the heating cylinder 1, increasing the heat exchange area and quickly preheating the raw material to the specified temperature. The preheated material is guided into the inclined cylinder 35 through the conical cylinder 34. The condenser 36 on the inclined cylinder 35 first performs preliminary separation of some high-boiling-point condensable impurities in the material. Subsequently, the material enters the distillation column 37, and the secondary heating device 38 is started. Multiple sets of straight heat pipes 39 heat the material inside the distillation column 37. Uniform heating is provided to maintain the temperature gradient inside the column and meet the separation requirements of trioxymethylene and impurities. The spiral guide plate 311 inside the distillation column 37 extends the residence time of the material in the column, allowing the gas and liquid phases to fully contact and transfer mass, so as to efficiently separate trioxymethylene from impurities. The separated trioxymethylene vapor phase is transported to the condenser 313 through the inclined connecting pipe 312, and quickly condenses into liquid before flowing into the collection cylinder 314. The discharge pipe 33 at the bottom of the heating cylinder 1 is used to discharge unvaporized heavy component impurities. The discharge pipe 310 at the bottom of the distillation column 37 discharges the impurities separated in the column. The conveying pipe 315 at the bottom of the collection cylinder 314 outputs high-purity trioxymethylene product. The solenoid valves 44 of each pipeline control the timing of discharge and conveying to ensure the accuracy of operation.

[0026] In one embodiment of the present invention, a stirring assembly 5 is provided on the heating cylinder 1 and the distillation column 37. The stirring assembly 5 includes a square plate 51, which is fixedly installed at the bottom of the distillation column 37. A bottom motor 52 is fixedly installed on the square plate 51, and a propeller 53 is fixedly installed at the output end of the bottom motor 52. A servo motor 54 is fixedly installed on the heating cylinder 1, and a long rod 55 is fixedly installed at the output end of the servo motor 54. A triangular support frame 56 is fixedly installed inside the heating cylinder 1, and a stirring paddle 57 is fixedly installed on the long rod 55. Multiple sets of square plates 51, bottom motors 52, and propellers 53 are provided. Multiple sets of square plates 51, bottom motors 52, and propellers 53 are provided at the bottom of the distillation column 37. Multiple sets of propellers 53 are provided below multiple sets of straight heat conduction pipes 39. Multiple sets of triangular support frames 56 and stirring paddles 57 are provided. Multiple sets of stirring paddles 57 are provided at the center position of the spiral heat conduction pipes 32. The long rod 55 is rotatably installed on the triangular support frame 56.

[0027] In this embodiment, during the raw material preheating stage, the servo motor 54 on the heating cylinder 1 is activated, driving the long rod 55 to rotate multiple sets of stirring paddles 57 at the center of the spiral heat-conducting pipe 32, stirring the material inside the heating cylinder 1 and avoiding scaling and thermal decomposition of paraformaldehyde caused by uneven local heating. The triangular support frame 56 ensures the stable rotation of the long rod 55 and prevents deviation during stirring. Inside the distillation column 37, the bottom motors 52 on multiple sets of square plates 51 drive the propellers 53 to rotate below the straight heat-conducting pipe 39, breaking the stagnant state of the liquid layer of the material, enhancing the turbulent mixing of the gas and liquid phases, increasing the gas-liquid contact area, and further improving the mass transfer efficiency. The multiple sets of propellers 53 are evenly distributed to ensure uniform mixing of the material inside the column, avoid local mass transfer dead zones, reduce the risk of scaling, and extend the continuous operation cycle of the equipment.

[0028] In one embodiment of the present invention, an auxiliary component 6 is provided on the collection cylinder 314. The auxiliary component 6 includes an arc-shaped filter plate 61, which is fixedly installed inside the collection cylinder 314. A right-angle tube 62 is fixedly installed above the collection cylinder 314. A negative pressure device 63 is fixedly installed at one end of the right-angle tube 62, and a protective filter cylinder 64 is fixedly installed at the other end of the right-angle tube 62. A conical protective ring 65 is fixedly installed inside the collection cylinder 314. Multiple sets of right-angle tubes 62, negative pressure devices 63, and protective filter cylinders 64 are provided. The protective filter cylinder 64 is located inside the collection cylinder 314, the negative pressure device 63 is located outside the collection cylinder 314, and the conical protective ring 65 is located below the inclined connecting pipe 312 and above the arc-shaped filter plate 61.

[0029] In this embodiment, the liquid material condensed by the condenser 313 enters the collection cylinder 314. The conical protective ring 65 guides the material to prevent splashing and guides it to flow smoothly towards the arc-shaped filter plate 61. The arc-shaped filter plate 61 performs fine filtration of the material, intercepting tiny impurities and further improving the purity of the trioxymethylene product. Multiple sets of negative pressure devices 63 are activated, forming a micro-negative pressure environment in the collection cylinder 314 through the right-angle tube 62, accelerating the sedimentation and filtration of the material, while promoting the flow of the vapor phase in the distillation column 37 and improving the separation efficiency. The protective filter cylinder 64 prevents materials or impurities from entering the negative pressure device 63, protecting the normal operation of the equipment and preventing impurities from affecting the stability of the negative pressure system.

[0030] The signal interaction of each component adopts the PLC control protocol commonly used in industrial equipment, which is common knowledge to those skilled in the art and can be implemented without further detailed description. The control logic and signal interaction method are existing technologies and will not be described in detail. The standard parts used in this application can all be purchased from the market. The specific connection methods of each part are all connected by conventional methods such as riveting and welding that are mature in the existing technology. The standard parts are all of conventional models in the existing technology, and the circuit connection adopts conventional connection methods in the existing technology.

[0031] It should be noted that the above electrical components are all existing technology products. They are selected, installed and debugged by those skilled in the art according to the needs of use to ensure that all electrical appliances can work normally. The components are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known by those skilled in the art through technical manuals or conventional experimental methods. No specific restrictions are made here.

[0032] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A high-efficiency distillation device for trioxymethylene in the production of polyoxymethylene, comprising a heating cylinder (1), wherein a feed pipe (2) is fixedly installed on the heating cylinder (1), characterized in that: The heating cylinder (1) is provided with a distillation assembly (3), which includes a primary heating device (31). The primary heating device (31) is fixedly installed on the heating cylinder (1), and a spiral heat-conducting pipe (32) is fixedly installed on the primary heating device (31). A conical cylinder (34) is fixedly installed on the heating cylinder (1). One end of an inclined cylinder (35) is fixedly installed on the conical cylinder (34). A condenser (36) is fixedly installed on the inclined cylinder (35). A distillation column (37) is fixedly installed on the other end of the inclined cylinder (35). A secondary heating device (38) is fixedly installed on the distillation column (37). Multiple sets of direct heat pipes (39) are fixedly installed inside the secondary heating device (38). The distillation column (37) is fixedly installed with a spiral guide plate (311), and one end of the inclined connecting pipe (312) is fixedly installed at the top of the distillation column (37). A condenser (313) is fixedly installed on the inclined connecting pipe (312), and a collection cylinder (314) is fixedly installed at the other end of the inclined connecting pipe (312).

2. The high-efficiency trioxymethylene distillation equipment in the polyoxymethylene production process according to claim 1, characterized in that: The spiral heat pipe (32) is disposed inside the heating cylinder (1), and multiple sets of the straight heat pipes (39) are disposed inside the distillation column (37). The heating cylinder (1) and the distillation column (37) are connected by an inclined cylinder (35), and the distillation column (37) and the collecting cylinder (314) are connected by an inclined connecting pipe (312). The spiral guide plate (311) is disposed above the connection between the distillation column (37) and the inclined cylinder (35).

3. The high-efficiency trioxymethylene distillation equipment in the polyoxymethylene production process according to claim 2, characterized in that: The bottom of the heating cylinder (1) is fixedly installed with a discharge pipe (33), the bottom of the distillation column (37) is fixedly installed with a discharge pipe (310), and the bottom of the collecting cylinder (314) is fixedly installed with a conveying pipe (315).

4. The high-efficiency trioxymethylene distillation equipment in the polyoxymethylene production process according to claim 3, characterized in that: The distillation column (37) is provided with an auxiliary material injection pipe (41), the heating cylinder (1) and the distillation column (37) are fixedly installed with pressure gauges (42), the feed pipe (2) is snapped with a sealing plate (43), and the discharge pipe (33), the outlet pipe (310) and the conveying pipe (315) are fixedly installed with solenoid valves (44).

5. The high-efficiency trioxymethylene distillation equipment in the polyoxymethylene production process according to claim 1, characterized in that: A stirring assembly (5) is provided on the heating cylinder (1) and the distillation column (37). The stirring assembly (5) includes a square plate (51). The square plate (51) is fixedly installed at the bottom of the distillation column (37). A bottom motor (52) is fixedly installed on the square plate (51). A propeller (53) is fixedly installed at the output end of the bottom motor (52). A servo motor (54) is fixedly installed on the heating cylinder (1). A long rod (55) is fixedly installed at the output end of the servo motor (54). A triangular support frame (56) is fixedly installed inside the heating cylinder (1). A stirring paddle (57) is fixedly installed on the long rod (55).

6. The high-efficiency trioxymethylene distillation equipment in the polyoxymethylene production process according to claim 5, characterized in that: The square plate (51), bottom motor (52) and propeller (53) are provided in multiple sets. The multiple sets of the square plate (51), bottom motor (52) and propeller (53) are provided at the bottom of the distillation column (37), and the multiple sets of propeller (53) are provided below the multiple sets of direct heat pipes (39).

7. The high-efficiency trioxymethylene distillation equipment in the polyoxymethylene production process according to claim 5, characterized in that: The triangular support frame (56) and stirring paddle (57) are provided in multiple sets. The multiple sets of stirring paddle (57) are located at the center of the spiral heat pipe (32). The long rod (55) is rotatably installed on the triangular support frame (56).

8. The high-efficiency trioxymethylene distillation equipment in the polyoxymethylene production process according to claim 1, characterized in that: An auxiliary component (6) is provided on the collection cylinder (314). The auxiliary component (6) includes an arc-shaped filter plate (61). The arc-shaped filter plate (61) is fixedly installed inside the collection cylinder (314). A right-angle tube (62) is fixedly installed above the collection cylinder (314). A negative pressure device (63) is fixedly installed at one end of the right-angle tube (62). A protective filter cylinder (64) is fixedly installed at the other end of the right-angle tube (62). A conical protective ring (65) is fixedly installed inside the collection cylinder (314).

9. The high-efficiency trioxymethylene distillation equipment in the polyoxymethylene production process according to claim 8, characterized in that: Multiple sets of the right-angle tube (62), negative pressure device (63) and protective filter cartridge (64) are provided. The protective filter cartridge (64) is located inside the collection cylinder (314), and the negative pressure device (63) is located outside the collection cylinder (314).

10. The high-efficiency trioxymethylene distillation equipment in the polyoxymethylene production process according to claim 8, characterized in that: The conical protective ring (65) is located below the oblique connecting pipe (312) and above the arc-shaped filter plate (61).

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