A device for producing formaldehyde by using crude methanol as raw material

Abstract

The utility model relates to the technical field of chemical material processing, specifically discloses a device for producing formaldehyde by using crude methanol as raw material, which comprises a connecting kit for bearing liquid and a filtering assembly arranged in the connecting kit; the connecting kit comprises filter cartridge one and filter cartridge two, the filter cartridge one and the filter cartridge two are connected through a connecting pipe, and are in communication; the filter cartridge one comprises a cylinder body, a filtering inner cavity and a flow guide inner cavity are arranged on the inner side of the cylinder body, one or more limiting grooves are arranged in a ring array around the inner wall of the filtering inner cavity, and the inner side of the limiting groove is connected with the filtering assembly; the utility model utilizes various filtering materials such as filtering resin, molecular sieve, activated carbon fiber felt and ion exchange fiber to perform multistage filtering on crude methanol, does not need to use rectification mode, greatly reduces construction investment and operation energy consumption, and effectively saves production cost.

Description

Technical Field

[0001] This utility model relates to the field of chemical material processing technology, specifically to a device for producing formaldehyde using crude methanol as a raw material. Background Technology

[0002] Formaldehyde, as an important organic chemical raw material, has wide applications in many fields such as chemical industry, building materials, and pharmaceuticals. Currently, the industrial production of formaldehyde mainly adopts a technical route using refined methanol (with a content of over 99% and very low impurity content) as raw material. The specific process is as follows: refined methanol is vaporized and mixed with air and steam, and then dehydrated in an oxidation furnace under the action of a catalyst to produce formaldehyde.

[0003] However, the product of methanol synthesis units is crude methanol, and its methanol content is generally in the range of 70%-85% due to process differences. To convert crude methanol into refined methanol that meets the requirements for formaldehyde production, methanol distillation units are currently commonly used for purification. However, this purification method has significant drawbacks. On the one hand, the construction investment in methanol distillation units is large, increasing the initial cost for enterprises; on the other hand, its operating energy consumption is high, resulting in high production costs and reducing the economic benefits for enterprises.

[0004] To avoid the high investment and energy consumption problems associated with distillation, traditional methods attempt to purify crude methanol through filtration. However, existing filtration methods have many shortcomings, such as using a single filter material, making it difficult to comprehensively and efficiently remove various impurities from crude methanol. Moreover, after a period of use, the filtration efficiency gradually decreases. At this point, either the filter material needs to be replaced, which not only increases costs but also causes production interruptions; or the filter material needs to be regenerated. However, traditional regeneration methods have low processing efficiency, long regeneration time, and cumbersome auxiliary steps, seriously affecting the continuity and efficiency of production. Based on this, this application provides an apparatus for producing formaldehyde using crude methanol as a raw material. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an apparatus for producing formaldehyde using crude methanol as a raw material, which solves the problem that existing crude methanol purification technologies cannot meet the demand for efficient and low-cost production.

[0006] The present invention discloses an apparatus for producing formaldehyde using crude methanol as raw material, comprising a connecting kit for carrying liquid and a filter assembly disposed in the connecting kit. The connecting kit includes a filter cartridge one and a filter cartridge two, which are connected by a connecting pipe to achieve communication. The filter cartridge includes a cylinder body, and the inner side of the cylinder body is provided with a filter inner cavity and a flow guiding inner cavity. The inner wall of the filter inner cavity is provided with one or more limiting grooves in a ring array around it, and the inner side of the limiting groove is connected to the filter assembly. The filter assembly includes a filter resin and a molecular sieve. Both the filter resin and the molecular sieve have flanges on their outer sides, and the flanges are slidably adapted to the limiting groove. The bottom of the filter resin is integrally formed with a plug-in block, and the top of the molecular sieve is provided with a slot. The slot is adapted to the plug-in block, and a dispersion plate is provided between the two for later regeneration of the filter material.

[0007] As a further improvement of this utility model, a boss is provided at the bottom of the cylinder, a base is provided at the bottom of the boss, a support frame is provided at the bottom of the base, and the bottom of the support frame is adapted to the top of the filter cylinder.

[0008] As a further improvement of this utility model, the top of the filter cylinder is provided with a connecting cover, and the top of the connecting cover has two symmetrically arranged through holes, which are connected to the connecting pipe.

[0009] As a further improvement of this utility model, a valve is provided at the pipe body of the connecting pipe, and the valve is used to control the closing and opening of the conveying pipe.

[0010] As a further improvement of this utility model, the bottom of the cylinder is provided with two symmetrically arranged liquid outlets, and the liquid outlets are connected to the other end of the connecting pipe.

[0011] As a further improvement of this utility model, a sealing cover is provided on the top of the cylinder, and a liquid inlet and an air inlet are provided on the top of the sealing cover. The liquid inlet is used to transport crude methanol to be filtered, and the air inlet is used to transport gas that is heated and used to regenerate the filter assembly. A conveying pipe is provided inside the air inlet, and the conveying pipe extends above the filter resin.

[0012] As a further improvement of this utility model, a sealing groove is provided on the top of the cylinder outside the limiting groove, and a sealing flange is provided on the bottom of the sealing cover, the sealing flange being adapted to the sealing groove.

[0013] As a further improvement of this utility model, a connecting port is provided at the top center of the filter resin for the gas used to regenerate the filter assembly after heating to pass through. One or more through holes are provided at the bottom of the filter resin, and an air pipe is provided below the through holes at the dispersion plate. The air pipe is adapted to the through holes and is used to transport the heated gas into the interior of the filter resin.

[0014] As a further improvement of this utility model, a channel is provided in the middle of the inner side of the molecular sieve, and a combined tube is installed in the channel. One end of the combined tube extends to the bottom of the dispersion plate. A diffusion cavity is provided at the bottom of the channel in the middle of the molecular sieve. The diffusion cavity, the combined tube, and the channel form a communicating area.

[0015] As a further improvement of this utility model, an exhaust port is provided on one side of the cylinder, and one end of the exhaust port extends to the inner side of the guide cavity for subsequent gas exhaust.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention utilizes a variety of filter materials, such as filter resin, molecular sieve, activated carbon fiber felt, and ion exchange fiber, to perform multi-stage filtration of crude methanol without the need for distillation, which greatly reduces construction investment and operating energy consumption, and effectively saves production costs. When the filter material needs to be replaced, the operation is more convenient, reducing the time and labor costs in the replacement process. At the same time, through the optimized regeneration process, the filter material can be reused multiple times, further reducing the replacement cost of the filter material. The crude methanol first undergoes preliminary filtration through a filter resin and molecular sieve in filter cartridge one to remove impurities such as metal ions, organic acids, moisture, and small organic molecules. Then it enters filter cartridge two, where activated carbon fiber felt adsorbs organic impurities, and ion exchange fibers remove ionic impurities. This multi-stage fine filtration improves the purification effect and filtration efficiency of crude methanol. Meanwhile, a dispersion plate is set in the filter assembly. During the regeneration process, the heated gas can be evenly distributed around the filter resin and molecular sieve through the dispersion plate, so that the heated gas can come into more comprehensive and in-depth contact with the filter material, effectively improving the regeneration effect of the filter material. At the same time, the diffusion chamber design of the molecular sieve can evenly diffuse the heated gas to each part, further improving the regeneration efficiency. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a front view structural diagram of the connecting kit of this utility model; Figure 2 This is a three-dimensional structural diagram of the filter cartridge of this utility model; Figure 3 This is a front view structural diagram of the filter cartridge of this utility model; Figure 4 This is a bottom view of the filter cartridge structure of this utility model; Figure 5This is a top view of the filter cartridge of this utility model; Figure 6 This utility model Figure 3 Schematic diagram of the cross-sectional structure of AA.

[0018] In the diagram: 1. Connection kit; 2. Filtering component; 11. Filter cartridge one; 12. Exhaust port; 13. Connecting pipe; 14. Connecting cover; 15. Filter cartridge two; 16. Support frame; 17. Valve; 18. Base; 111. Cylinder body; 112. Sealing groove; 113. Sealing cover; 114. Sealing flange; 115. Limiting groove; 116. Boss; 117. Liquid outlet; 118. Air inlet; 119. Liquid inlet; 1110. Filter inner cavity; 1111. Flow guiding inner cavity; 21. Through hole; 22. Filter resin; 23. Dispersion plate; 24. Diffusion chamber; 25. Channel; 26. Molecular sieve; 27. Slot; 28. Connecting block; 29. ​​Gas tube. Detailed Implementation

[0019] The following illustrations will reveal several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the illustrations in a simple schematic manner.

[0020] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0021] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 5Formaldehyde, as an important organic chemical raw material, has wide applications in many fields. Currently, the industry commonly uses refined methanol to produce formaldehyde. This involves vaporizing the refined methanol, mixing it with air and steam, and finally dehydrating it in an oxidation furnace under the action of a catalyst. However, the methanol synthesis unit produces crude methanol, which typically has a methanol content of 70%-85%. To purify crude methanol into refined methanol that meets the requirements for formaldehyde production, the existing main method is to use a methanol distillation unit. However, this method has significant drawbacks such as high construction investment and high energy consumption. Traditional filtration purification methods also have many shortcomings, such as the use of a single filter material, easy decrease in filtration efficiency, high cost of replacing filter materials and impact on production continuity, low regeneration efficiency, and cumbersome steps. Therefore, this application provides an apparatus for producing formaldehyde using crude methanol as a raw material, including a connecting kit 1 for carrying the liquid and a filter assembly 2 disposed in the connecting kit 1. The connecting kit 1 includes a filter cartridge 11 and a filter cartridge 2 15. The filter cartridge 11 and the filter cartridge 2 15 are connected by a connecting pipe 13. The filter cartridge 11 includes a cylinder 111. The inner side of the cylinder 111 is provided with a filter inner cavity 1110 and a flow guiding inner cavity 1111. The inner wall of the filter inner cavity 1110 is provided with one or more limiting grooves 115 in a ring array around it. The inner side of the limiting groove 115 is connected to the filter assembly 2. The filter assembly 2 includes a filter resin 22 and a molecular sieve 26. Both the filter resin 22 and the molecular sieve 26 are provided with flanges on their outer sides, and the flanges are slidably adapted to the limiting groove 115. The bottom of the filter resin 22 is integrally formed with a plug block 28, and the top of the molecular sieve 26 is provided with a slot 27. The slot 27 is adapted to the plug block 28, and a dispersion plate 23 is provided between the two for later use in the regeneration of the filter material.

[0022] The connecting kit 1 consists of filter cartridge 11 and filter cartridge 2 15. Filter cartridge 11 and filter cartridge 2 15 are connected by a connecting pipe 13 to achieve communication between their internal spaces, allowing the liquid to flow smoothly between the two filter cartridges.

[0023] The filter cartridge 11 includes a cylinder 111, the interior of which is divided into a filtration inner cavity 1110 and a flow guiding inner cavity 1111. One or more limiting grooves 115 are arranged in a circular array around the inner wall of the filtration inner cavity 1110. These limiting grooves 115 are used to connect with the filter assembly 2, serving to fix the filter assembly 2. The flow guiding inner cavity 1111 is responsible for guiding the flow direction of the liquid, allowing the liquid to pass through the filter assembly 2 in an orderly manner.

[0024] The filter assembly 2 consists of filter resin 22 and molecular sieve 26. Both the filter resin 22 and the molecular sieve 26 have flanges on their outer sides. The size and shape of the flanges are adapted to the limiting groove 115, allowing them to slide within the limiting groove 115, which facilitates the installation and disassembly of the filter assembly 2.

[0025] The bottom of the filter resin 22 is integrally formed with an insertion block 28, and the top of the molecular sieve 26 is provided with a slot 27. The slot 27 is adapted to the size and shape of the insertion block 28, and the two can be tightly inserted together. Furthermore, a dispersion plate 23 is provided between the insertion block 28 and the slot 27. The main function of the dispersion plate 23 is to enable the regeneration medium (such as heated nitrogen) to be more evenly distributed between the filter resin 22 and the molecular sieve 26 during the later regeneration process, thereby improving the regeneration effect and efficiency.

[0026] When crude methanol enters filter cartridge 11, it first enters the filter cavity 1110. Since the filter assembly 2 is fixed in the filter cavity 1110 by the fit between the flange and the limiting groove 115, the crude methanol passes sequentially through the filter resin 22 and the molecular sieve 26. The filter resin 22 utilizes its specific functional groups to remove specific impurities such as metal ions and organic acids from the crude methanol through ion exchange and adsorption. The molecular sieve 26, relying on its uniform microporous structure, sieves and adsorbs molecules of different sizes and shapes, removing impurities such as moisture and small organic molecules. The liquid, after preliminary filtration by filter cartridge 11, flows into filter cartridge 2 15 through the connecting pipe 13. Different types or specifications of filter assemblies 2 can be installed in filter cartridge 2 15 according to actual needs to further refine the filtration of the liquid, thereby improving the purity of the crude methanol to meet the requirements of formaldehyde production.

[0027] After a period of use, the filtration efficiency of filter assembly 2 will decrease, requiring regeneration. This can be achieved by introducing a regeneration medium, such as heated nitrogen, into the filter cartridge 11. After entering the filter chamber 1110, the heated nitrogen passes through the dispersion plate 23, which evenly disperses the nitrogen around the filter resin 22 and molecular sieve 26. The heat provided by the heated nitrogen gives the impurity molecules adsorbed on the filter resin 22 and molecular sieve 26 sufficient energy to desorb. Simultaneously, the heated nitrogen carries the desorbed impurities out of the filter cartridge, thus regenerating filter assembly 2 for reuse.

[0028] Please see Figure 3 , Figure 4 The bottom of the cylinder 111 is provided with a boss 116, the bottom of the boss 116 is provided with a base 18, the bottom of the base 18 is provided with a support frame 16, and the bottom of the support frame 16 is adapted to the top of the filter cylinder 15.

[0029] The top of the filter cartridge 15 is provided with a connecting cover 14. The top of the connecting cover 14 has two symmetrically arranged through holes 21, which are connected to the connecting pipe 13.

[0030] A valve 17 is installed at the pipe body of the connecting pipe 13. The valve 17 is used to control the opening and closing of the conveying pipe.

[0031] The bottom of the cylinder 111 is provided with two symmetrically arranged liquid outlets 117, which are connected to the other end of the connecting pipe 13.

[0032] The top of the cylinder 111 is provided with a sealing cover 113. The top of the sealing cover 113 is provided with a liquid inlet 119 and an air inlet 118. The liquid inlet 119 is used to transport the crude methanol to be filtered, and the air inlet 118 is used to transport the gas used to regenerate the filter assembly 2 after heating. A conveying pipe is provided inside the air inlet 118, and the conveying pipe extends to the top of the filter resin 22.

[0033] The top of the cylinder 111 is provided with a sealing groove 112 outside the limiting groove 115, and the bottom of the sealing cover 113 is provided with a sealing flange 114, which is adapted to the sealing groove 112.

[0034] The connecting kit 1 includes filter cartridge 11 and filter cartridge 2 15, which are connected by connecting pipe 13 to allow the liquid to flow between them in an orderly manner.

[0035] The bottom of the filter cartridge 11 has a boss 116, which supports and stabilizes the cartridge 111. A base 18 is mounted on the bottom of the boss 116, further increasing the support area and enhancing the overall stability of the filter cartridge 11. A support frame 16 is located at the bottom of the base 18, and the bottom of the support frame 16 is fitted to the top of the filter cartridge 15. This design allows the filter cartridges 11 and 15 to be securely connected, forming a unified device structure.

[0036] The bottom of the cylinder 111 has two symmetrically arranged liquid outlets 117, which are connected to one end of the connecting pipe 13. The crude methanol, after preliminary filtration by the filter cylinder 111, flows into the connecting pipe 13 through the liquid outlets 117. A sealing cap 113 is installed on the top of the cylinder 111. The top of the sealing cap 113 has a liquid inlet 119 and an air inlet 118. The liquid inlet 119 is used to transport the crude methanol to be filtered, which enters the filter chamber 1110 of the filter cylinder 11 for filtration. The air inlet 118 is used to transport heated gas, such as heated nitrogen, used to regenerate the filter assembly 2. A conveying pipe is provided inside the air inlet 118, extending above the filter resin 22. This allows the heated gas to be directly transported above the filter resin 22, facilitating the regeneration of the filter assembly 2.

[0037] A sealing groove 112 is provided on the top of the cylinder 111 outside the limiting groove 115, and a sealing flange 114 is provided on the bottom of the sealing cover 113. The sealing flange 114 is adapted to the sealing groove 112. When the sealing cover 113 is installed on the top of the cylinder 111, the sealing flange 114 is embedded in the sealing groove 112, forming a good sealing effect, preventing the leakage of crude methanol or regeneration gas, and ensuring the normal operation of the device.

[0038] The top of filter cartridge 15 is equipped with a connecting cover 14, which has two symmetrically arranged through holes 21. These through holes 21 connect to the other end of the connecting pipe 13. Crude methanol, after being filtered by filter cartridge 11, enters filter cartridge 15 through the through holes 21 via the connecting pipe 13 for further filtration. A valve 17 is installed at the body of the connecting pipe 13 to control its opening and closing. When crude methanol needs to be transported, the valve 17 is opened, allowing it to flow smoothly from filter cartridge 11 to filter cartridge 15. When it is necessary to stop the transport or operate a specific filter cartridge individually, the valve 17 is closed, achieving effective control of the liquid flow.

[0039] The material filled inside filter cartridge 2 15 is different from that of filter cartridge 1 11, mainly consisting of activated carbon fiber felt and ion exchange fiber.

[0040] Activated carbon fiber felt possesses a rich microporous structure and a large specific surface area, with a uniform micropore size distribution, exhibiting a strong adsorption capacity for organic impurities in crude methanol, such as aromatic hydrocarbons, ketones, and esters. Compared to traditional granular activated carbon, activated carbon fiber felt has a faster adsorption rate because its fibrous structure allows the adsorbate to diffuse more quickly into the internal micropores. Furthermore, activated carbon fiber felt has high strength, is not easily broken, and maintains good structural stability during the filtration process.

[0041] Ion exchange fibers are a type of ion exchange material with advantages such as fast ion exchange rate and large exchange capacity. In crude methanol filtration, ion exchange fibers can remove ionic impurities, such as metal ions (e.g., iron ions, copper ions) and inorganic anions (e.g., chloride ions, sulfate ions). Ion exchange fibers have good chemical stability, can be used within a wide temperature and pH range, and can restore their exchange capacity through acid-base regeneration, allowing for multiple reuses.

[0042] After the crude methanol, which has undergone preliminary filtration through filter cartridge 11, enters filter cartridge 2 15, it first flows through activated carbon fiber felt, where a large amount of organic impurities are adsorbed and removed. Then, the crude methanol passes through ion exchange fibers to further remove ionic impurities. In this way, after fine filtration through filter cartridge 2 15, the purity of the crude methanol is further improved, which can better meet the requirements of formaldehyde production.

[0043] The filter assembly 2 consists of filter resin 22 and molecular sieve 26. One or more limiting grooves 115 are arranged in a circular array around the inner wall of the filter cavity 1110. Flanges are provided on the outer sides of both the filter resin 22 and the molecular sieve 26, and these flanges slide into and out of the limiting grooves 115. This facilitates the installation and removal of the filter assembly 2, allowing operators to easily slide the filter assembly 2 into or out of the filter cavity 1110 along the limiting grooves 115. An insert block 28 is integrally formed at the bottom of the filter resin 22, and a slot 27 is provided at the top of the molecular sieve 26. The slot 27 is adapted to the insert block 28, and a dispersion plate 23 is provided between them. During installation, the insert block 28 of the filter resin 22 is inserted into the slot 27 of the molecular sieve 26, ensuring a tight connection between the filter resin 22 and the molecular sieve 26. The dispersion plate 23 plays an important role in the later regeneration process of the filter material. It can evenly disperse the heated gas delivered from the air inlet 118 around the filter resin 22 and molecular sieve 26, improve the regeneration effect and efficiency, and ensure that the filter assembly 2 can be used effectively multiple times.

[0044] Crude methanol enters the filtration chamber 1110 of filter cartridge 11 through the inlet 119 on the sealing cap 113, and is filtered sequentially through filter resin 22 and molecular sieve 26. Filter resin 22 removes impurities such as metal ions and organic acids from crude methanol through ion exchange and adsorption. Molecular sieve 26 uses its microporous structure to sieve and adsorb impurities such as moisture and small organic molecules. The crude methanol after preliminary filtration flows into filter cartridge 15 through the outlet 117 at the bottom of the cartridge 111, and then through the connecting pipe 13 and valve 17 for further fine filtration. When filter assembly 2 needs to be regenerated, valve 17 on the connecting pipe 13 is closed, and heated gas is supplied into the cartridge 111 through the air inlet 118. The gas reaches the filter resin 22 through the supply pipe, and after being evenly dispersed by the dispersion plate 23, it regenerates filter assembly 2, restoring its filtration performance for reuse.

[0045] Please see Figure 2 as well as Figure 5 The filter resin 22 has a communication port at the top center for the gas used to regenerate the filter assembly 2 after heating to pass through. The filter resin 22 has one or more through holes 21 at the bottom. Below the through holes 21, at the dispersion plate 23, there is a gas pipe 29. The gas pipe 29 is adapted to the through holes 21 and is used to transport the heated gas into the filter resin 22.

[0046] A channel 25 is provided in the middle of the inner side of the molecular sieve 26. A combined tube is installed in the channel 25. One end of the combined tube extends to the bottom of the dispersion plate 23. A diffusion cavity 24 is provided in the middle of the molecular sieve 26 at the bottom of the channel 25. The diffusion cavity 24, the combined tube, and the channel 25 form a connected area.

[0047] An exhaust port 12 is provided on one side of the cylinder 111, and one end of the exhaust port 12 extends to the inside of the guide cavity 1111 for the subsequent exhaust of gas.

[0048] The filter assembly 2 consists of filter resin 22 and molecular sieve 26. The limiting grooves 115 around the inner wall of the filter cavity 1110 slide and adapt to the flanges on the outer sides of the filter resin 22 and molecular sieve 26, facilitating installation and disassembly. The insertion block 28 at the bottom of the filter resin 22 adapts to the slot 27 at the top of the molecular sieve 26, and a dispersion plate 23 is provided between the two.

[0049] The filter resin 22 has a connecting port at the top center, through which the gas used to regenerate the filter assembly 2 after heating enters the filter resin 22. The bottom of the filter resin 22 has one or more through holes 21, and below the through holes 21, at the dispersion plate 23, there is a gas pipe 29, which is adapted to the through holes 21. During regeneration, the heated gas enters the delivery pipe through the air inlet 118, reaching the top of the filter resin 22. Part of the gas enters the interior of the filter resin 22 through the connecting port, while the other part enters the filter resin 22 through the through holes 21 via the gas pipe 29. This allows the heated gas to contact the filter resin 22 more comprehensively and deeply, effectively removing impurities adsorbed on the filter resin 22.

[0050] A channel 25 is located in the middle of the inner side of the molecular sieve 26. A combined tube is installed in the channel 25, with one end extending to the bottom of the dispersion plate 23. A diffusion chamber 24 is located at the bottom of the channel 25 in the middle of the molecular sieve 26. The diffusion chamber 24, the combined tube, and the channel 25 form a connected area. During the regeneration process, after the heated gas enters the filter resin 22, a portion of it enters the combined tube after passing through the dispersion plate 23, and then enters the diffusion chamber 24 through the channel 25. The diffusion chamber 24 can evenly diffuse the heated gas to all parts of the molecular sieve 26, improving the regeneration effect of the molecular sieve 26 and making it easier to desorb impurities such as water and small organic molecules adsorbed inside the molecular sieve 26.

[0051] An exhaust port 12 is provided on one side of the cylinder 111, and one end of the exhaust port 12 extends into the inner side of the guide cavity 1111. During the regeneration process of the filter assembly 2, the heated gas carries the impurities desorbed from the filter resin 22 and molecular sieve 26, collects them through the guide cavity 1111 to the exhaust port 12, and finally discharges from the device from the exhaust port 12, completing the entire regeneration process.

[0052] Crude methanol enters the filtration chamber 1110 of filter cartridge 11 through inlet 119, and is filtered sequentially by filter resin 22 and molecular sieve 26. The filtered crude methanol then enters filter cartridge 15 through outlet 117 and connecting pipe 13 for further filtration. When filter assembly 2 needs regeneration, valve 17 on connecting pipe 13 is closed, and heated gas is introduced through inlet 118. The heated gas is evenly distributed around filter resin 22 and molecular sieve 26 through connecting port, gas pipe 29, and combined pipe, causing impurities to desorb. The desorbed impurities are discharged from exhaust port 12 through guide chamber 1111 with the heated gas, thus regenerating filter assembly 2 for reuse.

[0053] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An apparatus for producing formaldehyde using crude methanol as a raw material, comprising a connecting kit (1) for carrying liquid and a filter assembly (2) disposed in the connecting kit (1); Its features are: The connecting kit (1) includes a filter cartridge one (11) and a filter cartridge two (15), and the filter cartridge one (11) and the filter cartridge two (15) are connected by a connecting pipe (13) to achieve communication; The filter cartridge (11) includes a cylinder (111), and the inner side of the cylinder (111) is provided with a filter inner cavity (1110) and a flow guiding inner cavity (1111). The inner wall of the filter inner cavity (1110) is provided with one or more limiting grooves (115) in a ring array around it. The inner side of the limiting groove (115) is connected to the filter assembly (2). The filter assembly (2) includes a filter resin (22) and a molecular sieve (26). Both the filter resin (22) and the molecular sieve (26) are provided with flanges on their outer sides. The flanges are slidably adapted to the limiting groove (115). The bottom of the filter resin (22) is integrally formed with a plug-in block (28), and the top of the molecular sieve (26) is provided with a slot (27). The slot (27) is adapted to the plug-in block (28), and a dispersion plate (23) is provided between the two for later use in the regeneration of filter material.

2. The apparatus for producing formaldehyde using crude methanol as raw material according to claim 1, characterized in that: The bottom of the cylinder (111) is provided with a boss (116), the bottom of the boss (116) is provided with a base (18), the bottom of the base (18) is provided with a support frame (16), and the bottom of the support frame (16) is adapted to the top of the filter cylinder (15).

3. The apparatus for producing formaldehyde using crude methanol as raw material according to claim 1, characterized in that: The top of the filter cylinder (15) is provided with a connecting cover (14), and the top of the connecting cover (14) has two symmetrically arranged through holes (21), which are connected to the connecting pipe (13).

4. The apparatus for producing formaldehyde using crude methanol as raw material according to claim 1, characterized in that: A valve (17) is provided at the pipe body of the connecting pipe (13), and the valve (17) is used to control the opening and closing of the conveying pipe.

5. The apparatus for producing formaldehyde using crude methanol as raw material according to claim 1, characterized in that: The bottom of the cylinder (111) is provided with two symmetrically arranged liquid outlets (117), and the liquid outlets (117) are connected to the other end of the connecting pipe (13).

6. The apparatus for producing formaldehyde using crude methanol as raw material according to claim 1, characterized in that: The top of the cylinder (111) is provided with a sealing cap (113), and the top of the sealing cap (113) is provided with a liquid inlet (119) and an air inlet (118). The liquid inlet (119) is used to transport crude methanol to be filtered, and the air inlet (118) is used to transport gas after heating for regenerating the filter assembly (2). A conveying pipe is provided inside the air inlet (118), and the conveying pipe extends above the filter resin (22).

7. The apparatus for producing formaldehyde using crude methanol as raw material according to claim 1, characterized in that: The top of the cylinder (111) is provided with a sealing groove (112) outside the limiting groove (115), and the bottom of the sealing cover (113) is provided with a sealing flange (114), which is adapted to the sealing groove (112).

8. The apparatus for producing formaldehyde using crude methanol as raw material according to claim 1, characterized in that: The filter resin (22) has a communication port at the top center for the gas used to regenerate the filter assembly (2) after heating to pass through. The filter resin (22) has one or more through holes (21) at the bottom. Below the through hole (21) at the dispersion plate (23), there is a gas pipe (29). The gas pipe (29) is adapted to the through hole (21) to transport the heated gas into the filter resin (22).

9. The apparatus for producing formaldehyde using crude methanol as raw material according to claim 1, characterized in that: A channel (25) is provided in the middle of the inner side of the molecular sieve (26). A combined tube is installed in the channel (25). One end of the combined tube extends to the bottom of the dispersion plate (23). A diffusion cavity (24) is provided in the middle of the molecular sieve (26) at the bottom of the channel (25). The diffusion cavity (24) forms a communication area with the combined tube and the channel (25).

10. The apparatus for producing formaldehyde using crude methanol as raw material according to claim 1, characterized in that: An exhaust port (12) is provided on one side of the cylinder (111), and one end of the exhaust port (12) extends to the inside of the guide cavity (1111) for the subsequent exhaust of gas.

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