Reaction equipment for producing formaldehyde from methanol
By using a combination design of threaded heating tubes, heating rods and steam inlet pipes in the methanol-to-formaldehyde reaction equipment, combined with heating zeolite particles and stirring device, the problems of low methanol conversion rate and high energy consumption in traditional equipment are solved, and a highly efficient methanol oxidation reaction to produce formaldehyde is realized.
Patent Information
- Application Number
- CN202423297012.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Traditional equipment for the oxidation of methanol to formaldehyde suffers from low methanol conversion rate and high energy consumption, especially under high temperature conditions where the reaction effect is poor.
The design incorporates a threaded heating tube and heating rod embedded inside an insulated container, combined with a steam inlet pipe and heated zeolite particles. By controlling the methanol injection pressure and temperature, and combining this with a stirring device, the reaction is accelerated and the reaction conditions are optimized.
The conversion rate of methanol is improved and energy consumption is reduced under high temperature conditions, thus achieving a highly efficient methanol oxidation reaction to formaldehyde.
Smart Images
Figure CN223697749U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of methanol production technology, and more particularly to a reaction apparatus for producing formaldehyde from methanol. Background Technology
[0002] Industrially, formaldehyde is mainly produced using methanol oxidation and direct natural gas oxidation. In the methanol oxidation method, the primary reaction between methanol and oxygen to produce formaldehyde is a gas-solid phase catalytic reaction, although its reaction mechanism remains a subject of considerable debate. Methanol dehydrogenation reactions are endothermic reactions involving an increase in the number of molecules, and are favored at both low and high temperatures. Thermodynamic calculations show that below 720 K, the reaction free energy ΔG for methanol dehydrogenation is positive, making it the most thermodynamically unfavorable reaction. A catalyst is required to allow the reaction to proceed at low temperatures, and higher conversion rates are achieved above 500 °C.
[0003] In the process of oxidizing methanol to produce formaldehyde, the methanol dehydrogenation reaction is an endothermic reaction that increases the number of molecules. High temperatures are beneficial for the reaction, and a high conversion rate is achieved only at temperatures above 500℃. Although traditional processes are relatively mature, traditional equipment suffers from drawbacks such as low methanol conversion rates and high energy consumption. Utility Model Content
[0004] This application provides a reaction apparatus for producing formaldehyde from methanol, addressing the issue that high temperatures favor the reaction, with higher conversion rates only achieved above 500℃. While traditional processes are relatively mature, conventional equipment suffers from drawbacks such as low methanol conversion rates and high energy consumption.
[0005] This application provides a reaction device for producing formaldehyde from methanol, including an outer tank, inside which is an insulated tank; a threaded heating tube is embedded in the outer wall of the insulated tank, and multiple heating rods are arranged in a circle on the inner wall of the insulated tank; heating zeolite particles are arranged at the bottom of the insulated tank; an upper tank is provided at the upper end of the outer tank, and a water tank is provided at the upper end of the upper tank; a water outlet pipe is provided at one end of the water tank, and a water pump is provided at the lower end of the water outlet pipe; a steam inlet pipe is provided at the lower end of the water pump, and a heating wire is provided around the upper outer ring of the steam inlet pipe, with a protective shell around the heating wire; the lower end of the steam inlet pipe is fixed to the outside of the methanol injection chamber by a support rod; a fixing plate is provided inside the upper tank, and a methanol pipe is provided at the upper end of the fixing plate, extending through the upper tank to the outside; a control valve is provided at the upper end of the methanol pipe.
[0006] Preferably, the lower end of the steam inlet pipe is designed in a circular shape.
[0007] Preferably, the lower end of the fixed plate is provided with a methanol injection chamber, and multiple rows of injection holes are evenly arranged on the lower side wall of the methanol injection chamber.
[0008] Preferably, a drive motor is provided at the upper end of the fixed plate, and a hydraulic cylinder is provided at the lower end of the drive motor. The hydraulic cylinder extends into the methanol injection chamber and a telescopic shaft is provided at the lower end of the hydraulic cylinder.
[0009] Preferably, a No. 1 motor is provided at the lower end of the telescopic shaft, a rotating shaft is provided at the lower end of the No. 1 motor, and a stirring net is provided on the outer ring of the rotating shaft.
[0010] Preferably, an air outlet pipe is provided through the side wall of the upper barrel, and multiple air outlet pipes are arranged in a circular pattern, with a pressure relief valve provided at the upper end of each of the multiple air outlet pipes.
[0011] Preferably, a discharge pipe is provided through the bottom of the outer barrel and extends through the insulated barrel, the lower end of the discharge pipe is connected to an absorption tank, and a support leg is provided at the bottom of the outer barrel.
[0012] Beneficial effects:
[0013] Considering that the methanol dehydrogenation reaction is an endothermic reaction involving the increase of molecular number in the methanol oxidation process to formaldehyde, high temperatures are beneficial for the reaction, with higher conversion rates only achieved at temperatures above 500℃. Although traditional processes are relatively mature, traditional equipment suffers from drawbacks such as low methanol conversion rates and high energy consumption.
[0014] This application involves opening a control valve, allowing methanol to enter the methanol injection chamber through the methanol pipe. Methanol then gradually flows out from the injection hole at the bottom of the methanol injection chamber and falls into the insulated container below. Air is then injected to increase the pressure inside the insulated container. The threaded heating pipe and heating rod are then activated to heat the inside of the insulated container. Heating stops when a specific temperature is reached, and steam is introduced through the steam inlet pipe to accelerate the methanol oxidation reaction and increase the conversion rate. The heating wire in the steam inlet pipe ensures the temperature of the steam entering the insulated container. Heating zeolite particles further maintains a constant temperature inside the insulated container. Maintaining this temperature for 1-2 hours maximizes the methanol conversion rate while minimizing energy consumption.
[0015] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the overall structure of a reaction device for producing formaldehyde from methanol according to this utility model.
[0018] Figure 2 This is a schematic cross-sectional view of the reaction equipment for producing formaldehyde from methanol according to this utility model.
[0019] Figure 3 This is a schematic diagram of the steam device structure of a methanol-to-formaldehyde reaction equipment according to this utility model.
[0020] Figure 4 This is a schematic diagram of the exploded structure of a reaction device for producing formaldehyde from methanol according to this utility model.
[0021] Explanation of reference numerals in the attached figures:
[0022] 1. Outer tank; 2. Insulated tank; 3. Threaded heating tube; 4. Heating rod; 5. Heated zeolite particles; 6. Upper tank; 7. Gas outlet pipe; 8. Pressure relief valve; 9. Control valve; 10. Methanol pipe; 11. Fixing plate; 12. Methanol injection chamber; 13. Drive motor; 14. Hydraulic cylinder; 15. Telescopic shaft; 16. Motor No. 1; 17. Rotating shaft; 18. Stirring screen; 19. Injection hole; 20. Water tank; 21. Water outlet pipe; 22. Water pump; 23. Heating wire; 24. Protective shell; 25. Steam inlet pipe; 26. Support rod; 27. Discharge pipe; 28. Absorption tank; 29. Support leg. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.
[0025] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0026] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0027] Furthermore, the descriptions of directions such as the X direction, Y direction, and Z direction used to explain the operation and construction of the components in this embodiment are not absolute but relative. Although these directions are appropriate when the components are in the positions shown in the figure, they should be interpreted differently when these positions change.
[0028] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.
[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
[0031] This utility model provides, for example Figure 1-4 The apparatus shown is a methanol-to-formaldehyde reaction device, comprising an outer tank 1, inside which is an insulated tank 2; a threaded heating tube 3 is embedded in the outer wall of the insulated tank 2, and multiple heating rods 4 are arranged in a circle on the inner wall of the insulated tank 2; heating zeolite particles 5 are arranged at the bottom of the insulated tank 2; an upper tank 6 is arranged at the upper end of the outer tank 1, and a water tank 20 is arranged at the upper end of the upper tank 6; a water outlet pipe 21 is arranged at one end of the water tank 20, and a water pump 22 is arranged at the lower end of the water outlet pipe 21; a steam inlet pipe 25 is arranged at the lower end of the water pump 22; a heating wire 23 is arranged around the upper outer ring of the steam inlet pipe 25, and a protective shell 24 is arranged around the outer ring of the heating wire 23; the lower end of the steam inlet pipe 25 is fixed to the outside of the methanol injection chamber 12 by a support rod 26; a fixing plate 11 is arranged inside the upper tank 6, and a methanol pipe 10 is arranged at the upper end of the fixing plate 11, extending through the upper tank 6 to the outside; a control valve 9 is arranged at the upper end of the methanol pipe 10.
[0032] Among them, the heating zeolite particles 5 can continue to keep the inside of the container warm after the heating stops; the water pump 22 is used to draw water out of the water tank 20; the heating wire 23 can ensure the temperature of the steam entering the heat preservation tank 2; and the control valve 9 is used to control the methanol entering the methanol injection chamber 12.
[0033] The lower end of the steam inlet pipe 25 is designed in a circular shape.
[0034] A methanol injection chamber 12 is provided at the lower end of the fixed plate 11, and multiple rows of injection holes 19 are evenly arranged on the lower side wall of the methanol injection chamber 12.
[0035] The injection port 19 allows methanol to be injected into the reaction cavity below at a uniform speed.
[0036] A drive motor 13 is provided at the upper end of the fixed plate 11, and a hydraulic cylinder 14 is provided at the lower end of the drive motor 13. The hydraulic cylinder 14 extends into the methanol injection chamber 12 through the methanol injection chamber 12, and a telescopic shaft 15 is provided at the lower end of the hydraulic cylinder 14.
[0037] The drive motor 13 is used to provide power to the hydraulic cylinder 14.
[0038] A No. 1 motor 16 is installed at the lower end of the telescopic shaft 15, and a rotating shaft 17 is installed at the lower end of the No. 1 motor 16. A stirring net 18 is installed around the outer ring of the rotating shaft 17.
[0039] Among them, motor 16 is used to provide power to the rotating shaft 17.
[0040] A vent pipe 7 is installed through the side wall of the upper barrel 6. Multiple vent pipes 7 are arranged in a circular pattern, and a pressure relief valve 8 is installed at the upper end of each vent pipe 7.
[0041] Among them, the pressure relief valve 8 is designed to prevent excessive internal pressure from causing the device to explode.
[0042] A discharge pipe 27 is installed at the bottom of the outer barrel 1, penetrating the insulated barrel 2. The lower end of the discharge pipe 27 is connected to an absorption tank 28. A support leg 29 is installed at the bottom of the outer barrel 1.
[0043] The absorption tank 28 contains an absorbent liquid, primarily to prevent formaldehyde gas from polluting the factory area.
[0044] Working Principle: In use, this methanol-to-formaldehyde reaction equipment allows the user to open the control valve 9, allowing methanol to enter the methanol injection chamber 12 through the methanol pipe 10. Methanol then flows out gradually from the injection hole 19 at the lower end of the methanol injection chamber 12 into the insulated tank 2 below. Air is then injected to increase the pressure inside the insulated tank 2. The threaded heating pipe 3 and heating rod 4 are then activated to heat the insulated tank 2. Heating stops when a specific temperature is reached. Steam is introduced through the steam inlet pipe 25, accelerating the methanol oxidation reaction and increasing the conversion rate. The heating wire 23 of the steam inlet pipe 25 ensures the temperature of the steam entering the insulated tank 2. Heating the zeolite particles 5 further maintains a constant temperature inside the insulated tank 2, allowing the reaction to continue at this temperature.
[0045] At this point, the drive motor 13 can be turned on. Once the drive motor 13 is turned on, it can provide power to the hydraulic cylinder 14. At this time, the telescopic shaft 15 extends downward, and at the same time, the first motor 16 is turned on. When the first motor 16 is turned on, the rotating shaft 17 will start to rotate. Since the outer ring of the rotating shaft 17 is equipped with a stirring net 18, when the rotating shaft 17 starts to rotate, it will cause the stirring net 18 to start to rotate and stir. Under the stirring of the stirring net 18, the reaction of methanol can be accelerated. Then, the heat preservation tank 2 is cooled to room temperature and pressure is reduced to normal pressure. Finally, the valve of the discharge pipe 27 is opened to discharge the material into the absorption tank 28 for cooling and absorption to obtain crude formaldehyde. The absorption tank 28 contains absorption liquid, mainly to avoid formaldehyde gas pollution of the factory area.
[0046] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A reaction apparatus for the production of formaldehyde from methanol, comprising an outer barrel (1), characterised in that: The outer barrel (1) is equipped with an insulated barrel (2) inside; The outer wall of the heat preservation barrel (2) is embedded with a threaded heating tube (3), and multiple heating rods (4) are arranged in a circle on the inner wall of the heat preservation barrel (2). Heating zeolite particles (5) are arranged at the bottom of the heat preservation barrel (2). The upper end of the outer barrel (1) is provided with an upper barrel (6), the upper end of the upper barrel (6) is provided with a water tank (20), one end of the water tank (20) is provided with a water outlet pipe (21), the lower end of the water outlet pipe (21) is provided with a water pump (22), the lower end of the water pump (22) is provided with a steam inlet pipe (25), the upper outer ring of the steam inlet pipe (25) is provided with a heating wire (23), the outer ring of the heating wire (23) is provided with a protective shell (24), and the lower end of the steam inlet pipe (25) is fixed to the outside of the methanol injection chamber (12) by a support rod (26). The upper barrel (6) is provided with a fixing plate (11), and a methanol pipe (10) is provided at the upper end of the fixing plate (11). The methanol pipe (10) extends through the upper barrel (6) to the outside, and a control valve (9) is provided at the upper end of the methanol pipe (10).
2. The apparatus for producing formaldehyde from methanol according to claim 1, wherein: The lower end of the steam inlet pipe (25) is designed in a circular shape.
3. A methanol production formaldehyde reaction apparatus according to claim 2, characterized by: The lower end of the fixed plate (11) is provided with a methanol injection chamber (12), and multiple rows of injection holes (19) are evenly arranged on the lower side wall of the methanol injection chamber (12).
4. The reaction equipment for producing formaldehyde from methanol according to claim 2, characterized in that: The upper end of the fixed plate (11) is provided with a drive motor (13), and the lower end of the drive motor (13) is provided with a hydraulic cylinder (14). The hydraulic cylinder (14) extends through the methanol injection chamber (12) and into the interior. The lower end of the hydraulic cylinder (14) is provided with a telescopic shaft (15).
5. The reaction equipment for producing formaldehyde from methanol according to claim 4, characterized in that: A No. 1 motor (16) is provided at the lower end of the telescopic shaft (15), and a rotating shaft (17) is provided at the lower end of the No. 1 motor (16). A stirring net (18) is provided on the outer ring of the rotating shaft (17).
6. The reaction equipment for producing formaldehyde from methanol according to claim 1, characterized in that: The upper barrel (6) has a through-hole vent pipe (7) on its side wall. Multiple vent pipes (7) are arranged in a circular pattern, and each of the multiple vent pipes (7) has a pressure relief valve (8) at its upper end.
7. The reaction equipment for producing formaldehyde from methanol according to claim 1, characterized in that: The bottom of the outer barrel (1) is connected to the heat-insulating barrel (2) and a discharge pipe (27) is provided. The lower end of the discharge pipe (27) is connected to an absorption tank (28). The bottom of the outer barrel (1) is provided with a support leg (29).