Preparation method of aluminum fumaric acid dehumidification rotating wheel, dehumidification rotating wheel and dehumidifier

Abstract

The invention discloses a preparation method of an aluminum fumaric acid desiccant rotating wheel, a desiccant rotating wheel and a dehumidifier, and relates to the technical field of dehumidification, the preparation method of the aluminum fumaric acid desiccant rotating wheel comprises the following steps: dissolving fumaric acid and sodium hydroxide in water, then adding into an aluminum sulfate solution, stirring, and after the reaction is completed, carrying out suction filtration, drying and grinding to obtain the aluminum fumaric acid desiccant rotating wheel. Aluminum fumaric acid MOF powder is obtained; uniformly mixing aluminum fumaric acid powder, a hydrophilic adhesive and water to obtain aluminum fumaric acid impregnation liquid; the preparation method comprises the following steps: impregnating inorganic fiber paper in an aluminum fumaric acid impregnation liquid, pulling, and drying with hot air at 100-150 DEG C to obtain a flaky moisture absorption material; the moisture absorption material is divided into two parts, one part of the moisture absorption material is pressed into a corrugated shape, the other part of the moisture absorption material is kept in a plane shape, the corrugated moisture absorption material is compounded on the plane-shaped moisture absorption material, and then the dehumidification rotating wheel is obtained through winding. The method is simple in step, high-temperature sintering is not needed, and the prepared dehumidification rotating wheel has a good moisture absorption effect.

Description

Technical Field

[0001] This invention relates to the field of dehumidification technology, and in particular to a method for preparing an aluminum fumarate dehumidification rotor, the dehumidification rotor, and a dehumidifier. Background Technology

[0002] Rotary dehumidifiers are one of the most widely used solid adsorption dehumidification technologies in practical engineering. They utilize the good hydrophilicity of the adsorbent material to adsorb moisture from the air, reducing humidity. Metal-organic frameworks (MOFs) are among the most recently studied solid adsorbent materials. Aluminum fumarate (MOF) adsorbents, in particular, possess characteristics such as high saturated adsorption capacity (above 0.4 g / g), good thermal stability, S-type water vapor adsorption isotherm, and a relatively low desorption temperature (approximately 70℃). Dehumidifier rotors made from MOFs have a large dehumidification capacity and can be regenerated using low-grade heat sources such as solar energy and industrial waste heat.

[0003] Regarding the preparation method of aluminum fumaric acid MOF adsorbent, Chinese invention patent CN201910641671.9 discloses a honeycomb ceramic-based aluminum-fumaric acid MOF adsorbent and its in-situ synthesis method. The method adopts in-situ synthesis, which involves immersing a honeycomb ceramic substrate preform in a mixed solution to obtain a preform containing deprotonated fumaric acid. The preform containing deprotonated fumaric acid is then immersed in an aluminum salt solution, heated in a water bath, cooled to room temperature, filtered to collect the precipitate, washed, dried, and heated for sintering activation treatment to obtain the honeycomb ceramic-based aluminum-fumaric acid MOF adsorbent. However, this preparation method has the following drawbacks: 1) It first prepares a honeycomb ceramic substrate and then impregnates it with fumaric acid and aluminum liquid. Although the resulting honeycomb ceramic-based aluminum-fumaric acid MOF adsorbent has good hygroscopicity, its small pore size leads to high air resistance when used in dehumidification rotary cores; 2) The preparation of this honeycomb ceramic-based aluminum-fumaric acid MOF adsorbent requires two high-temperature firings at temperatures exceeding 300℃. At this temperature, the binder carbonizes and fails, resulting in a decrease in the bonding strength of the aluminum-fumaric acid MOF material, making it prone to detachment and powdering. Furthermore, high-temperature sintering consumes a lot of energy; 3) The preparation method is complex, and the crystallization of aluminum-fumaric acid is difficult, resulting in an inability to achieve optimal hygroscopic performance. In addition, existing preparation methods also suffer from difficulties in combining MOF with the substrate, leading to powdering and low strength.

[0004] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a method for preparing an aluminum fumarate dehumidifying rotor, a dehumidifying rotor and a dehumidifier, which aims to simplify the preparation steps of the aluminum fumarate dehumidifying rotor, reduce energy consumption and improve the moisture absorption effect of the dehumidifying rotor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for preparing an aluminum fumaric acid dehumidifying rotor, wherein the method includes the following steps:

[0008] Preparation of aluminum fumaric acid MOF powder: Fumaric acid and sodium hydroxide were dissolved in water and then added to aluminum sulfate solution. The mixture was stirred and, after the reaction was complete, filtered, dried, and ground to obtain aluminum fumaric acid MOF powder.

[0009] Preparation of aluminum fumaric acid impregnation solution: aluminum fumaric acid powder, hydrophilic binder and water are mixed evenly to obtain aluminum fumaric acid impregnation solution;

[0010] Preparation of moisture-absorbing material: Inorganic fiber paper is impregnated in aluminum fumaric acid impregnation solution, stretched, and then dried with hot air at 100-150℃ to obtain sheet-like moisture-absorbing material.

[0011] Preparation of dehumidifying wheel: The moisture-absorbing material is divided into two parts. One part is pressed into a corrugated shape, and the other part remains flat. The corrugated moisture-absorbing material is laminated onto the flat moisture-absorbing material, and then the dehumidifying wheel is obtained by winding.

[0012] In the preparation method of the aluminum fumaric acid dehumidifying rotor, in the preparation step of the aluminum fumaric acid impregnation solution, the mass ratio of aluminum fumaric acid to hydrophilic adhesive is 100:(0.5~2).

[0013] In the preparation method of the aluminum fumaric acid dehumidifying rotor, the hydrophilic binder is selected from at least one of chitosan, sodium carboxymethyl cellulose, sodium alginate, and polyvinylpyrrolidone.

[0014] In the preparation method of the aluminum fumaric acid dehumidifying rotor, the hydrophilic binder is chitosan.

[0015] In the preparation method of the aluminum fumaric acid dehumidifying rotor, the mass ratio of aluminum fumaric acid MOF powder to chitosan is 100:1.2.

[0016] In the preparation method of the aluminum fumaric acid dehumidifying rotor, in the preparation step of the aluminum fumaric acid MOF powder, the mass ratio of fumaric acid: sodium hydroxide: water is 1:1:10.

[0017] In the preparation method of the aluminum fumaric acid dehumidifying rotor, in the preparation step of the aluminum fumaric acid MOF powder, the mass ratio of aluminum sulfate to water is 1:4.

[0018] In the preparation method of the aluminum fumaric acid dehumidifying rotor, the reaction temperature in the preparation step of the aluminum fumaric acid MOF powder is 25℃~70℃.

[0019] A dehumidifying impeller, wherein the dehumidifying impeller is prepared by the method for preparing an aluminum fumaric acid dehumidifying impeller as described above.

[0020] A rotary dehumidifier, wherein it includes a dehumidifying rotor as described above.

[0021] Beneficial effects:

[0022] This invention provides a method for preparing an aluminum fumarate dehumidifying rotor, the dehumidifying rotor itself, and a dehumidifier. The method involves adhering aluminum fumarate MOF powder to inorganic fiber paper using a hydrophilic adhesive. After drying, the rotor is obtained through corrugation, lamination, and winding. This preparation method is simple and easy to implement, and it eliminates the need for high-temperature sintering, resulting in low energy consumption. Furthermore, the hydrophilic adhesive does not carbonize, ensuring a stable bond to the aluminum fumarate MOF material and preventing powder shedding. It also preserves the hydrophilic properties of the adhesive, improving the desiccant's hygroscopicity. In addition, the process involves first coating the inorganic fiber paper with aluminum fumarate MOF material before corrugation, lamination, and winding, resulting in a dehumidifying rotor with low wind resistance, thus reducing the energy consumption of the dehumidifier. Attached Figure Description

[0023] Figure 1 The process flow diagram illustrates the preparation method of the aluminum fumaric acid dehumidifying rotor provided by this invention.

[0024] Figure 2 The image shows a scanning electron microscope (SEM) image of the moisture-absorbing material prepared in Example 1. Detailed Implementation

[0025] This invention provides a method for preparing an aluminum fumarate dehumidifying rotor, the dehumidifying rotor itself, and a dehumidifier. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the following embodiments are provided to further illustrate the invention in detail. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0026] Please see Figure 1 The first aspect of this invention provides a method for preparing an aluminum fumaric acid dehumidifying rotor, the method comprising the following steps:

[0027] Preparation of aluminum fumaric acid MOF powder: Fumaric acid and sodium hydroxide were dissolved in water and then added to aluminum sulfate solution. The mixture was stirred and, after the reaction was complete, filtered, dried, and ground to obtain aluminum fumaric acid MOF powder.

[0028] Preparation of aluminum fumaric acid impregnation solution: aluminum fumaric acid powder, hydrophilic binder and water are mixed evenly to obtain aluminum fumaric acid impregnation solution;

[0029] Preparation of moisture-absorbing material: Inorganic fiber paper is impregnated in aluminum fumaric acid impregnation solution, stretched, and then dried with hot air at 100-150℃ to obtain sheet-like moisture-absorbing material.

[0030] Preparation of dehumidifying wheel: The moisture-absorbing material is divided into two parts. One part is pressed into a corrugated shape, and the other part remains flat. The corrugated moisture-absorbing material is laminated onto the flat moisture-absorbing material, and then the dehumidifying wheel is obtained by winding.

[0031] In this preparation method, aluminum fumarate MOF powder is first prepared, then adhered to inorganic fiber paper using a hydrophilic adhesive. After drying, the dehumidifying rotor is obtained through corrugation, lamination, and winding. This preparation method is simple and easy to implement, and does not require high-temperature sintering during the preparation process. Therefore, the hydrophilic adhesive will not carbonize, ensuring a stable bond of the aluminum fumarate MOF material and preventing powder shedding. It also allows the hydrophilic adhesive to maintain its hydrophilic properties, improving the moisture absorption of the dehumidifying rotor. Furthermore, since high-temperature sintering is not required, energy consumption is lower, making it more environmentally friendly. In addition, the preparation process involves first coating the inorganic fiber paper with aluminum fumarate MOF material, followed by corrugation, lamination, and winding, resulting in a dehumidifying rotor with low wind resistance, reducing the energy consumption of the dehumidifier.

[0032] In a preferred embodiment, the hydrophilic binder is selected from at least one of chitosan, sodium carboxymethyl cellulose, sodium alginate, and polyvinylpyrrolidone. The aforementioned hydrophilic binder can react with aluminum fumaric acid in water to uniformly disperse the aluminum fumaric acid, thereby ensuring a more uniform distribution on the inorganic fiber paper. Furthermore, the adhesiveness and thickening properties of this type of hydrophilic binder can firmly adhere the aluminum fumaric acid to the inorganic fiber paper. More importantly, the aforementioned hydrophilic binder has a water-absorbing effect, especially chitosan, which can synergistically work with aluminum fumaric acid to greatly improve its moisture absorption effect.

[0033] The amount and ratio of aluminum fumaric acid to the hydrophilic adhesive affect its moisture absorption and adhesion strength. When the amount of aluminum fumaric acid is fixed and its mass ratio with the hydrophilic adhesive is high, the impregnation solution system is prone to instability, resulting in sedimentation and stratification. This leads to uneven distribution of aluminum fumaric acid on the inorganic fiber paper and uneven dehumidification effect. Conversely, when the mass ratio of aluminum fumaric acid to the hydrophilic adhesive is low, although a more uniform distribution of aluminum fumaric acid on the inorganic fiber paper can be ensured, the desorption temperature of water vapor (i.e., regeneration temperature) will increase. In a preferred embodiment, in the preparation step of the aluminum fumaric acid impregnation solution, by adjusting the mass ratio of aluminum fumaric acid to hydrophilic adhesive to 100:(0.5-2), the aluminum fumaric acid can be uniformly dispersed in the impregnation solution, and the impregnation solution system is stable. Furthermore, the aluminum fumaric acid and hydrophilic adhesive within this ratio range can form a porous structure with a large specific surface area, resulting in good moisture absorption, excellent dehumidification performance, and a low regeneration temperature (50-70°C).

[0034] In a preferred embodiment, the hydrophilic adhesive is chitosan, which can bind well with fumaric acid to form a complex, which not only improves the dispersibility of aluminum fumaric acid in the impregnation solution, but also has better adhesion and better moisture absorption.

[0035] In a preferred embodiment, the mass ratio of aluminum fumaric acid to chitosan is 100:(1-1.5), and the inorganic fiber paper prepared by aluminum fumaric acid and chitosan with this ratio has better hygroscopicity.

[0036] Preferably, the mass ratio of aluminum fumaric acid to chitosan is 100:1.2. The inorganic fiber paper prepared by aluminum fumaric acid and chitosan with this ratio has better hygroscopicity and lower regeneration temperature (50-55°C).

[0037] In a preferred embodiment, in the preparation step of the aluminum fumaric acid MOF powder, the mass ratio of fumaric acid: sodium hydroxide: water is (0.5-1.2):(0.8-1.5):(9-13), preferably 1:1:10. This mass ratio of raw materials allows for better protonation of fumaric acid, facilitating subsequent proton exchange with aluminum salt solution and increasing the yield of aluminum fumaric acid MOF powder.

[0038] In a preferred embodiment, in the preparation step of the aluminum fumaric acid MOF powder, the mass ratio of aluminum sulfate to water is (0.5-1.5):3, preferably 1:4. The aluminum sulfate solution of this concentration can undergo proton exchange with sodium fumaric acid to obtain aluminum fumaric acid MOF powder with smaller particle size and larger specific surface area.

[0039] In the preparation of the aluminum fumarate MOF powder, the reaction temperature affects the reaction rate and crystal size. Higher temperatures result in faster proton exchange, smaller crystal size, and higher specific surface area. However, excessively high temperatures hinder crystal precipitation, while excessively low temperatures lead to slow reaction rates and long reaction times. Therefore, in a preferred embodiment, the reaction temperature is between 25°C and 70°C, allowing for a reaction time of 0.5 h to 3 h, thus obtaining aluminum fumarate MOF powder with a suitable particle size.

[0040] The second aspect of the present invention also provides a dehumidifying impeller, which is prepared by the method described above for preparing an aluminum fumarate dehumidifying impeller. The dehumidifying impeller has good hygroscopicity, and the aluminum fumarate MOF material is firmly adhered and will not shed powder during repeated use, thus having a long service life.

[0041] A third aspect of the present invention also provides a rotary dehumidifier, which includes the dehumidifying rotor as described above, and has a good moisture absorption effect and a long service life.

[0042] To further illustrate the preparation method of the aluminum fumaric acid dehumidifying rotor provided by the present invention, the following embodiments are provided.

[0043] Example 1

[0044] A method for preparing an aluminum fumaric acid dehumidifying rotor, the method comprising the following steps:

[0045] Preparation of aluminum fumaric acid MOF powder: Fumaric acid, sodium hydroxide and water in a mass ratio of 1:1:10 were stirred and mixed, and then added to an aluminum sulfate solution in which the mass ratio of aluminum sulfate to water was 1:4. The mixture was stirred and reacted at 55°C for 1 hour. The mixture was then filtered, dried and ground to obtain aluminum fumaric acid MOF powder.

[0046] Preparation of aluminum fumaric acid impregnation solution: aluminum fumaric acid and hydrophilic binder are taken at a mass ratio of 100:1.2, wherein the hydrophilic binder is chitosan. Aluminum fumaric acid powder, chitosan and water are mixed evenly to obtain aluminum fumaric acid impregnation solution.

[0047] Preparation of moisture-absorbing material: Inorganic fiber paper is impregnated in aluminum fumaric acid impregnation solution. After complete penetration, it is stretched and then dried with hot air at 120℃ to obtain sheet-like moisture-absorbing material. Figure 2 (Scanning electron microscope image of the moisture-absorbing material);

[0048] Preparation of dehumidifying wheel: The moisture-absorbing material is divided into two parts. One part is pressed into a corrugated shape, and the other part remains flat. The corrugated moisture-absorbing material is glued onto the flat moisture-absorbing material, and then the dehumidifying wheel is obtained by winding.

[0049] Example 2

[0050] A method for preparing an aluminum fumaric acid dehumidifying rotor, the method comprising the following steps:

[0051] Preparation of aluminum fumaric acid MOF powder: Fumaric acid, sodium hydroxide and water in a mass ratio of 0.5:1.5:13 were stirred and mixed, and then added to an aluminum sulfate solution in which the mass ratio of aluminum sulfate to water was 1:6. The mixture was stirred and reacted at 70°C for 0.5 h. After filtration, drying and grinding, aluminum fumaric acid MOF powder was obtained.

[0052] Preparation of aluminum fumaric acid impregnation solution: aluminum fumaric acid and hydrophilic binder are taken at a mass ratio of 100:0.5, wherein the hydrophilic binder is sodium carboxymethyl cellulose. The aluminum fumaric acid powder, the hydrophilic binder and water are mixed evenly to obtain aluminum fumaric acid impregnation solution.

[0053] Preparation of moisture-absorbing material: Inorganic fiber paper is impregnated in aluminum fumaric acid impregnation solution. After complete penetration, it is stretched and then dried with hot air at 100°C to obtain sheet-like moisture-absorbing material.

[0054] Preparation of dehumidifying wheel: The moisture-absorbing material is divided into two parts. One part is pressed into a corrugated shape, and the other part remains flat. The corrugated moisture-absorbing material is glued onto the flat moisture-absorbing material, and then the dehumidifying wheel is obtained by winding.

[0055] Example 3

[0056] A method for preparing an aluminum fumaric acid dehumidifying rotor, the method comprising the following steps:

[0057] Preparation of aluminum fumaric acid MOF powder: Fumaric acid, sodium hydroxide and water in a mass ratio of 1.2:0.8:9 were stirred and mixed, and then added to an aluminum sulfate solution in which the mass ratio of aluminum sulfate to water was 1:2. The mixture was stirred and reacted at 25°C for 3 hours. The mixture was then filtered, dried and ground to obtain aluminum fumaric acid MOF powder.

[0058] Preparation of aluminum fumaric acid impregnation solution: aluminum fumaric acid and hydrophilic adhesive are taken at a mass ratio of 100:2. The hydrophilic adhesive is a mixture of chitosan and sodium alginate at a mass ratio of 1:1. The aluminum fumaric acid powder, hydrophilic adhesive and water are mixed evenly to obtain aluminum fumaric acid impregnation solution.

[0059] Preparation of moisture-absorbing material: Inorganic fiber paper is impregnated in aluminum fumaric acid impregnation solution. After complete penetration, it is stretched and then dried with hot air at 150℃ to obtain sheet-like moisture-absorbing material.

[0060] Preparation of dehumidifying wheel: The moisture-absorbing material is divided into two parts. One part is pressed into a corrugated shape, and the other part remains flat. The corrugated moisture-absorbing material is glued onto the flat moisture-absorbing material, and then the dehumidifying wheel is obtained by winding.

[0061] Example 4

[0062] A method for preparing an aluminum fumaric acid dehumidifying rotor, the method comprising the following steps:

[0063] Preparation of aluminum fumaric acid MOF powder: Fumaric acid, sodium hydroxide and water in a mass ratio of 1:1.3:12 were stirred and mixed, and then added to an aluminum sulfate solution in which the mass ratio of aluminum sulfate to water was 1:3. The mixture was stirred and reacted at 50°C for 1 hour. The mixture was then filtered, dried and ground to obtain aluminum fumaric acid MOF powder.

[0064] Preparation of aluminum fumaric acid impregnation solution: aluminum fumaric acid and hydrophilic adhesive are taken at a mass ratio of 100:1. The hydrophilic adhesive is a mixture of chitosan and polyvinylpyrrolidone at a mass ratio of 1:1. The aluminum fumaric acid powder, hydrophilic adhesive and water are mixed evenly to obtain aluminum fumaric acid impregnation solution.

[0065] Preparation of moisture-absorbing material: Inorganic fiber paper is impregnated in aluminum fumaric acid impregnation solution. After complete penetration, it is stretched and then dried with hot air at 120℃ to obtain sheet-like moisture-absorbing material.

[0066] Preparation of dehumidifying wheel: The moisture-absorbing material is divided into two parts. One part is pressed into a corrugated shape, and the other part remains flat. The corrugated moisture-absorbing material is glued onto the flat moisture-absorbing material, and then the dehumidifying wheel is obtained by winding.

[0067] Comparative Example 1

[0068] A method for preparing an aluminum fumaric acid dehumidifying rotor is basically the same as the preparation method described in Example 1, except that the hydrophilic adhesive is replaced with polyvinyl alcohol.

[0069] Comparative Example 2

[0070] A method for preparing an aluminum fumaric acid dehumidifying rotor is basically the same as the preparation method described in Example 1, except that the hot air drying temperature is 300°C in the preparation step of the moisture-absorbing material.

[0071] Performance testing

[0072] The dehumidifying rotors prepared in Examples 1-4 and Comparative Examples 1-2 were subjected to performance tests, including saturated dehumidification performance and adhesion strength of aluminum fumaric acid on inorganic fiber paper. Specific test results are shown in Table 1. It should be noted that the dehumidification performance test involved placing the prepared dehumidifying rotor in a constant temperature and humidity chamber and testing its hygroscopicity at 25°C and 70% humidity. The adhesion strength test of aluminum fumaric acid on inorganic fiber paper involved placing the dehumidifying rotor in a dehumidifier and performing dehumidification and desorption purging at a wind speed of 40 m / s for 100 hours. The weight of the dehumidifying rotor before and after purging was measured, and the dust removal rate was calculated using the formula: Dust removal rate = (g1-g2) / g1*100%, where g1 is the weight of the dehumidifying rotor before the test, and g2 is the weight of the dehumidifying rotor after the test. Specific results are shown in Table 1.

[0073] Table 1. Performance Test Results

[0074] Saturated moisture absorption rate % Powder drop rate % Example 1 40％ 0.1％ Example 2 30％ 0.6％ Example 3 32％ 0.3％ Example 4 31％ 0.4％ Comparative Example 1 25％ 0.8％ Comparative Example 2 37％ 2.5％

[0075] As shown in Table 1, the saturated moisture absorption rates of Examples 1-4 are all relatively high, exceeding 30%, indicating good moisture absorption performance. In particular, the dehumidifying wheel using chitosan as a hydrophilic binder has a saturated moisture absorption rate as high as 40%. The powder shedding rate of Examples 1-4 is less than 1%, indicating that aluminum fumaric acid has high adhesion strength on inorganic fiber paper under the action of hydrophilic binder, which can give the dehumidifying wheel a longer service life.

[0076] The only difference between Comparative Example 1 and the Example is that polyvinyl alcohol is used as a binder. However, its saturated moisture absorption rate and dust shedding rate are worse than those of Example 1. This shows that chitosan-based hydrophilic adhesives can effectively improve the saturated moisture absorption rate of the dehumidification wheel. At the same time, they can improve the adhesion strength of aluminum fumarate MOF material on inorganic fiber paper.

[0077] The only difference between Comparative Example 2 and Example 1 is the drying temperature. However, the saturated powder shedding rate of Comparative Example 2 increased to 2.5%. This may be because the higher drying temperature causes the hydrophilic binder to carbonize, resulting in a decrease in its adhesive strength and thus an increase in the powder shedding rate. In addition, the carbonized hydrophilic binder loses its hygroscopicity, leading to a decrease in the saturated moisture absorption rate of the dehumidification wheel.

[0078] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A method for preparing an aluminum fumaric acid dehumidifying impeller, characterized in that, The method includes the following steps: Preparation of aluminum fumaric acid MOF powder: Fumaric acid and sodium hydroxide were dissolved in water and then added to aluminum sulfate solution. The mixture was stirred and, after the reaction was complete, filtered, dried, and ground to obtain aluminum fumaric acid MOF powder. Preparation of aluminum fumaric acid impregnation solution: aluminum fumaric acid powder, hydrophilic binder and water are mixed evenly to obtain aluminum fumaric acid impregnation solution; Preparation of moisture-absorbing material: Inorganic fiber paper is impregnated in aluminum fumaric acid impregnation solution, stretched, and then dried with hot air at 100-150℃ to obtain sheet-like moisture-absorbing material. Preparation of dehumidifying wheel: The moisture-absorbing material is divided into two parts. One part is pressed into a corrugated shape, and the other part remains flat. The corrugated moisture-absorbing material is laminated onto the flat moisture-absorbing material, and then the dehumidifying wheel is obtained by winding.

2. The method for preparing the aluminum fumaric acid dehumidifying impeller according to claim 1, characterized in that, In the preparation step of the aluminum fumaric acid impregnation solution, the mass ratio of aluminum fumaric acid to hydrophilic adhesive is 100:(0.5-2).

3. The method for preparing the aluminum fumaric acid dehumidifying impeller according to claim 2, characterized in that, The hydrophilic binder is selected from at least one of chitosan, sodium carboxymethyl cellulose, sodium alginate, and polyvinylpyrrolidone.

4. The method for preparing the aluminum fumaric acid dehumidifying impeller according to claim 2, characterized in that, The hydrophilic binder is chitosan.

5. The method for preparing the aluminum fumaric acid dehumidifying impeller according to claim 4, characterized in that, The mass ratio of the aluminum fumarate MOF powder to chitosan is 100:1.

2.

6. The method for preparing the aluminum fumaric acid dehumidifying impeller according to claim 1, characterized in that, In the preparation step of the aluminum fumaric acid MOF powder, the ratio of fumaric acid to sodium hydroxide is: The mass ratio of water is 1:1:

10.

7. The method for preparing the aluminum fumaric acid dehumidifying rotor according to claim 1, characterized in that, In the preparation step of the aluminum fumarate MOF powder, the mass ratio of aluminum sulfate to water is 1:

4.

8. The method for preparing the aluminum fumaric acid dehumidifying impeller according to claim 1, characterized in that, In the preparation steps of the aluminum fumarate MOF powder, the reaction temperature is 25℃~70℃.

9. A dehumidifying impeller, characterized in that, The dehumidifying impeller is prepared by the method for preparing an aluminum fumaric acid dehumidifying impeller as described in any one of claims 1-8.

10. A rotary dehumidifier, characterized in that, It includes the dehumidifying impeller as described in claim 9.

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