Method for regenerating molecular sieve drier and application thereof

Abstract

The present application relates to the technical field of molecular sieve drier regeneration, and particularly relates to a method for dehydrating and regenerating a molecular sieve drier and application thereof. The method comprises the following steps: in the presence of a regeneration gas, dehydrating and regenerating a water-containing molecular sieve drier to obtain a regenerated molecular sieve drier; wherein the regeneration gas contains an active small-molecule gas capable of reacting with water, and the volume content of the active small-molecule gas in the regeneration gas is not less than 1 vol.%; and the temperature of the dehydrating and regenerating is 100-250 DEG C. The chemical water removal is coupled with the physical thermal dehydration, the regeneration effect is excellent, and the service life of the drier can be prolonged.

Description

Technical Field

[0001] This invention relates to the field of molecular sieve desiccant regeneration technology, specifically to a method and application for dehydrating and regenerating molecular sieve desiccants. Background Technology

[0002] Molecular sieve desiccants are widely used in chemical, food, medical, and electronics industries due to their excellent hygroscopic properties. Their ability to be dehydrated, regenerated, and recycled is one of the key reasons for their extensive use. The regeneration process directly affects their adsorption characteristics and related properties. Currently, the widely recognized and used dehydration and regeneration technologies are pressure conversion dehydration and regeneration technology (i.e., vacuum dehydration and regeneration technology) and temperature conversion dehydration and regeneration technology.

[0003] For pressure conversion dehydration and regeneration technology, after the molecular sieve desiccant is used, it is placed in a closed environment and the environmental pressure is reduced by the equipment (i.e., the desiccant is evacuated). At the same time, the temperature can be increased to desorb the water adsorbed by the desiccant at a pressure lower than that used to achieve the purpose of dehydration and regeneration. The main disadvantages of this technology include: (1) It requires vacuum equipment and auxiliary heating equipment, which are densely packed, resulting in high energy consumption and equipment investment; (2) The back-and-forth switching between high and low pressure can easily lead to damage to the desiccant structure, resulting in loss of adsorption capacity or even failure; (3) The degree of dehydration and regeneration is not high.

[0004] For temperature-conversion dehydration and regeneration technology, after the molecular sieve desiccant is used, the adsorbed water is desorbed at high temperature by raising the temperature of the desiccant, thus achieving the purpose of dehydration and regeneration. There are two common heating methods: one is to directly heat the desiccant by introducing hot regeneration gas, and the other is to heat the desiccant through heating equipment while simultaneously introducing a certain amount of regeneration gas for purging. The main disadvantages of this technology include: (1) if the regeneration temperature is too low, the dehydration depth is insufficient, the regeneration time is long, and the regeneration purpose is not achieved; (2) if the regeneration temperature is too high, the desiccant structure is easily damaged, resulting in a decrease in the strength of the desiccant, and high energy consumption and equipment investment; (3) frequent high and low temperature switching will reduce the mechanical strength of the desiccant and cause material loss; (4) aluminum in the molecular sieve lattice will be removed under high temperature water vapor conditions, causing the molecular sieve adsorption capacity to be lost and the desiccant to become ineffective.

[0005] Currently, researchers' research on the above dehydration and regeneration technologies is limited to the screening and optimization of parameters. For example, the study in "Research on the Dehydration Characteristics of 4A Molecular Sieve" (Comprehensive Utilization of Mineral Resources, Wang Hongliang et al., 2023(3): 161-164) suggests that the dehydration temperature of 4A molecular sieve desiccant is >200℃.

[0006] Therefore, providing a new dehydration and regeneration method to achieve deep dehydration of molecular sieve desiccants at lower temperatures is of great significance for improving the dehydration and regeneration effect of molecular sieve desiccants and extending their service life. Summary of the Invention

[0007] This invention addresses the problems of existing molecular sieve desiccant regeneration processes, which suffer from long regeneration times and unsatisfactory regeneration effects at lower regeneration temperatures, and high energy consumption and potential damage to the desiccant structure at higher regeneration temperatures, thus affecting the desiccant's lifespan. It provides a method and application for the dehydration and regeneration of molecular sieve desiccants.

[0008] To achieve the above objectives, the first aspect of the present invention provides a method for dehydrating and regenerating a molecular sieve desiccant, the method comprising:

[0009] In the presence of regeneration gas, a water-containing molecular sieve desiccant is dehydrated and regenerated to obtain a regenerated molecular sieve desiccant.

[0010] The regenerated gas contains active small molecule gas that can react with water, and the volume content of the active small molecule gas in the regenerated gas is not less than 1% by volume.

[0011] The temperature for dehydration and regeneration is 100-250℃.

[0012] The second aspect of the present invention provides the application of the molecular sieve desiccant dehydration and regeneration method described in the first aspect in the dehydration treatment of materials.

[0013] The present invention provides a method for dehydrating and regenerating molecular sieve desiccants by coupling a chemical reaction dehydration process with a physical thermal dehydration process. These two dehydration strategies work simultaneously during the dehydration and regeneration process, jointly promoting the dehydration and regeneration of the molecular sieve desiccant. Compared to traditional single physical thermal dehydration, the method of the present invention can significantly shorten the dehydration and regeneration time of the molecular sieve desiccant and, to a certain extent, reduce the dehydration temperature. This reduces the damage to the desiccant structure caused by repeated switching between high-temperature regeneration and low-temperature use, thereby extending the service life of the desiccant. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 The XRD pattern of the 4A molecular sieve after dehydration and regeneration 10 times using the method of Example 4 of this invention. Detailed Implementation

[0016] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0017] The first aspect of this invention provides a method for dehydrating and regenerating a molecular sieve desiccant, the method comprising:

[0018] In the presence of regeneration gas, a water-containing molecular sieve desiccant is dehydrated and regenerated to obtain a regenerated molecular sieve desiccant.

[0019] The regenerated gas contains active small molecule gas that can react with water, and the volume content of the active small molecule gas in the regenerated gas is not less than 1% by volume.

[0020] The temperature for dehydration and regeneration is 100-250℃.

[0021] The present invention provides a method for dehydrating and regenerating molecular sieve desiccants. At a certain temperature, a regeneration gas containing active small molecule gases is used to dehydrate and regenerate the molecular sieve desiccant. The active small molecule gases react with the water adsorbed in the molecular sieve desiccant to achieve chemical dehydration. Simultaneously, utilizing the exothermic nature of water-vapor conversion, the heat released by the chemical reaction is supplied in situ to the molecular sieve desiccant to further promote thermal dehydration. This coupling of chemical dehydration and physical thermal dehydration allows both strategies to work simultaneously, jointly promoting dehydration and regeneration of the desiccant. This achieves deep dehydration of the molecular sieve desiccant at a relatively low temperature, avoiding damage to the composition and structure of the molecular sieve desiccant, resulting in excellent regeneration performance and extending the desiccant's service life.

[0022] According to the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, the molecular sieve desiccant is not particularly limited and can be any molecular sieve product capable of effectively absorbing water and used as a desiccant. For example, the silicon-aluminum molar ratio in the molecular sieve desiccant can be (1-500):1, the pore volume can be 0.1-2 mL / g, and the specific surface area can be 100-1000 m². 2 / g.

[0023] In this invention, the silicon-to-aluminum molar ratio of the molecular sieve is determined by inductively coupled plasma atomic emission spectrometry.

[0024] In this invention, the pore volume of the molecular sieve is determined by CO2 adsorption / desorption method.

[0025] In this invention, the specific surface area of ​​the molecular sieve is determined by CO2 adsorption / desorption method.

[0026] According to the present invention, there is no particular limitation on the source of the molecular sieve desiccant. It can be prepared by any method known to those skilled in the art for preparing molecular sieves, or a commercially available product can be used.

[0027] According to the present invention, the molecular sieve desiccant can be a conventional type of molecular sieve that can be used as a desiccant, such as including but not limited to at least one of molecular sieves having an LTA topology, molecular sieves having an FAU topology, molecular sieves having an MFI topology, molecular sieves having an BEA topology, molecular sieves having an MOR topology, and molecular sieves having an MWW topology.

[0028] According to the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, the aqueous molecular sieve desiccant refers to a molecular sieve in which fresh molecular sieve desiccant comes into contact with water (or water vapor), absorbs water, and adsorbs water on the surface and / or in the internal pores. The present invention does not particularly limit the water content in the aqueous molecular sieve desiccant; it can be any water content achievable within the water absorption capacity of the molecular sieve itself, for example, a saturated water absorption state.

[0029] According to the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, preferably, the volume content of the active small molecule gas in the regeneration gas is 50-100% by volume, which can achieve better dehydration and regeneration effect.

[0030] According to the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, the regeneration gas may contain, in addition to the active small molecule gas, a non-reactive gas that does not chemically react with the molecular sieve desiccant and water under the aforementioned temperature conditions. In the present invention, the non-reactive gas may include, but is not limited to, nitrogen, argon, helium, air, methane, ethane, or propane, or a mixture of the above gases.

[0031] According to a preferred embodiment of the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, the active small molecule gas is used entirely as the regeneration gas, which is more conducive to rapid and efficient dehydration.

[0032] According to the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, the active small molecule gas can react with the water adsorbed in the molecular sieve desiccant under the above-mentioned temperature conditions (e.g., water-vapor shift reaction), realizing the removal of water by chemical reaction, and the reaction product is carried away from the molecular sieve dehydrating agent by the regeneration gas. In the method for dehydrating and regenerating the molecular sieve desiccant of the present invention, a chemical reaction is used to transform the water that is difficult to remove from the molecular sieve into a substance that is easy to remove, thereby avoiding the use of high temperature to achieve a deep degree of dehydration. Compared with the latter, this achieves the purpose of reducing the dehydration temperature, thus avoiding the damage to the molecular sieve structure caused by repeated switching between high-temperature regeneration and low-temperature use, thereby extending the service life of the desiccant.

[0033] According to the present invention, the active small molecule gas may be selected from at least one of carbon monoxide, ethylene, acetylene and ethylene oxide.

[0034] According to a preferred embodiment of the present invention, the active small molecule gas is preferably carbon monoxide, which can undergo a water-vapor shift reaction with the water adsorbed by the molecular sieve desiccant at a specific temperature. The generated gaseous products are discharged with the regenerated gas, and the heat released by the reaction can be supplied to the molecular sieve desiccant in situ for further physical thermal dehydration, so as to make full use of the heat of reaction. At the same time, it can reduce the external energy supply and make it more conducive to the rapid and deep dehydration of the desiccant under mild conditions.

[0035] According to the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, the conditions for dehydration and regeneration include: a temperature of 100-180°C and a time of 0.5-120 min. Under these conditions, the dehydration and regeneration can efficiently remove most of the water from the molecular sieve desiccant, meeting the usage requirements of most industries.

[0036] According to the present invention, preferably, the conditions for dehydration and regeneration include: a temperature of 130-150°C and a time of 5-30 minutes.

[0037] According to the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, the pressure conditions for the dehydration and regeneration are relatively wide, and it can be carried out under normal pressure or under pressurized conditions. From the perspective of simplifying equipment, it is preferred to carry out the process under normal pressure.

[0038] According to the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, preferably, during the dehydration and regeneration process, the regeneration gas continuously passes through the water-containing molecular sieve desiccant. Preferably, the volume hourly space velocity of the regeneration gas is 1.8-1800 L / g. 分子筛 / h, further preferably 36-720L / g 分子筛 / h, to ensure that the active small molecule gas in the regenerated gas reacts fully with water, and to promptly remove the reaction products and the removed water vapor.

[0039] According to the present invention, in the method for dehydrating and regenerating the molecular sieve desiccant, there is no particular limitation on the apparatus for dehydration and regeneration. Any apparatus capable of performing the above-mentioned dehydration and regeneration operation can be used, such as a conventional catalyst regeneration reactor or a heating device such as a tubular furnace.

[0040] According to a specific embodiment of the present invention, the method for dehydrating and regenerating the molecular sieve desiccant can be carried out as follows:

[0041] The water-containing molecular sieve desiccant is placed in a regeneration device, regeneration gas is introduced, and then the temperature is raised to the target temperature to dehydrate and regenerate the water-containing molecular sieve desiccant. During the dehydration and regeneration process, regeneration gas is continuously introduced. After the dehydration and regeneration is completed, the temperature is lowered and the regeneration device is purged with purging gas (e.g., dry nitrogen), and the regenerated molecular sieve desiccant is removed.

[0042] The second aspect of the present invention provides the application of the molecular sieve desiccant dehydration and regeneration method described in the first aspect in the dehydration treatment of materials.

[0043] According to the present invention, the method for dehydrating and regenerating molecular sieve desiccants has the advantages of short dehydration and regeneration cycle, good regeneration effect and extended service life of desiccants. When this method is used to dehydrate and regenerate molecular sieve desiccants in material dehydration treatment, the resulting regenerated desiccants have strong stability and can bring stable material dehydration effect in multiple "water absorption-regeneration" processes.

[0044] In this invention, the material for the dehydration treatment is broadly defined and can be any material that can be dehydrated using molecular sieve desiccants, including but not limited to common water-containing organic materials (such as water-containing alcohols), water-containing gases, etc.

[0045] The present invention will be described in detail below through embodiments. In the following embodiments and comparative examples,

[0046] 4A molecular sieve: possesses an LTA topology, an average particle size of 50 μm, a silica-alumina molar ratio of 1:1, a pore volume of 1.94 mL / g, and a specific surface area of ​​470 m². 2 / g, purchased from Alfaeza (China) Chemical Co., Ltd.;

[0047] Aqueous 4A molecular sieve: The above-mentioned 4A molecular sieve was placed in a sealed container containing a saturated NaCl aqueous solution and allowed to absorb water for at least 36 hours to obtain a saturated water-absorbing 4A molecular sieve. The water content of the 4A molecular sieve was determined to be 24.45% by weight (based on the dry weight of the 4A molecular sieve) using the Karl Fischer method.

[0048] The moisture content (wt%, based on the dry weight of the 4A molecular sieve) of the regenerated 4A molecular sieve was determined by the Karl Fischer method.

[0049] The dewatering amount (wt%) of the regenerated 4A molecular sieve is the difference between the water content of the original 4A molecular sieve and the water content of the regenerated 4A molecular sieve.

[0050] Example 1

[0051] Weigh 2g of the above-mentioned 4A molecular sieve containing water and place it in a vertical tube furnace. Purge with dry CO gas for 30min at a flow rate of 200mL / min to fully purge the air from the tube furnace. Then, raise the temperature to 130℃ at a rate of 10℃ / min and perform dehydration and regeneration at this temperature for 5min (during the dehydration and regeneration process, CO gas is continuously purged at a volume hourly space velocity of 360L / g). 分子筛 / h), after the temperature drops to room temperature, purge with dry N2 for 30 min, and take out the regenerated 4A molecular sieve (denoted as C1).

[0052] The amount of water removed from C1 is shown in Table 1.

[0053] Example 2

[0054] Weigh 2g of the above-mentioned 4A molecular sieve containing water and place it in a vertical tube furnace. Purge with dry CO gas for 30min at a flow rate of 200mL / min to fully purge the air from the tube furnace. Then, raise the temperature to 150℃ at a rate of 10℃ / min and perform dehydration and regeneration at this temperature for 30min (during the dehydration and regeneration process, CO gas is continuously purged at a volume hourly space velocity of 360L / g). 分子筛 / h), after the temperature drops to room temperature, purge with dry N2 for 30 min, and take out the regenerated 4A molecular sieve (denoted as C2).

[0055] The dehydration amount of C2 is shown in Table 1.

[0056] Example 3

[0057] Weigh 2g of the above-mentioned 4A molecular sieve containing water and place it in a vertical tube furnace. Purge with dry acetylene gas for 30 minutes at a flow rate of 200 mL / min to fully purge the air from the furnace. Then, raise the temperature to 150°C at a rate of 10°C / min and perform dehydration and regeneration at this temperature for 120 minutes (acetylene gas is continuously purged during the dehydration and regeneration process, with a volume hourly space velocity of 360 L / g). 分子筛 / h), after the temperature drops to room temperature, purge with dry N2 for 30 minutes, and take out the regenerated 4A molecular sieve (denoted as C3).

[0058] The dehydration amount of C3 is shown in Table 1.

[0059] Example 4

[0060] Weigh 2g of the above-mentioned 4A molecular sieve containing water and place it in a vertical tube furnace. Purge with dry CO gas for 30 minutes at a flow rate of 200 mL / min to fully purge the air from the furnace. Then, raise the temperature to 130°C at a rate of 10°C / min and perform dehydration and regeneration at this temperature for 60 minutes (during which CO gas is continuously purged at a volume hourly space velocity of 360 L / g). 分子筛 / h), after the temperature drops to room temperature, purge with dry N2 for 30 minutes, and take out the regenerated 4A molecular sieve (denoted as C4).

[0061] The dehydration amount of C4 is shown in Table 1.

[0062] Example 5

[0063] Weigh 2g of the above-mentioned 4A molecular sieve containing water and place it in a vertical tube furnace. Purge with dry CO gas for 30 minutes at a flow rate of 200 mL / min to fully purge the air from the furnace. Then, raise the temperature to 180°C at a rate of 10°C / min and perform dehydration and regeneration at this temperature for 60 minutes (during which CO gas is continuously purged at a volume hourly space velocity of 360 L / g). 分子筛 / h), after the temperature drops to room temperature, purge with dry N2 for 30 minutes, and take out the regenerated 4A molecular sieve (denoted as C5).

[0064] The dehydration amount of C5 is shown in Table 1.

[0065] Example 6

[0066] Weigh 2g of the above-mentioned 4A molecular sieve containing water and place it in a vertical tube furnace. Purge with a mixture of dry CO and N2 gas (CO comprising 10% by volume) for 30 min at a flow rate of 200 mL / min to fully purge the air from the furnace. Then, raise the temperature to 130°C at a rate of 10°C / min and perform dehydration and regeneration at this temperature for 60 min (the mixed gas is continuously purged during the dehydration and regeneration process, with a volume hourly space velocity of 360 L / g). 分子筛 / h), after the temperature drops to room temperature, purge with dry N2 for 30 minutes, and take out the regenerated 4A molecular sieve (denoted as C6).

[0067] The dehydration amount of C6 is shown in Table 1.

[0068] Example 7

[0069] Weigh 2g of the above-mentioned 4A molecular sieve containing water and place it in a vertical tube furnace. Purge with a mixture of dry CO and N2 gas (CO comprising 50% by volume) for 30 min at a flow rate of 200 mL / min to fully purge the air from the furnace. Then, raise the temperature to 130°C at a rate of 10°C / min and perform dehydration and regeneration at this temperature for 60 min (during the dehydration and regeneration process, the mixed gas is continuously purged at a volume hourly space velocity of 360 L / g). 分子筛 / h), after the temperature drops to room temperature, purge with dry N2 for 30 minutes, and take out the regenerated 4A molecular sieve (denoted as C7).

[0070] The dehydration amount of C7 is shown in Table 1.

[0071] Comparative Example 1

[0072] The method of Example 1 was followed, except that the dry CO gas was replaced with dry N2. All other steps and conditions were the same as in Example 1, and the regenerated 4A molecular sieve (denoted as DC1) was obtained.

[0073] Comparative Example 2

[0074] Following the method of Example 2, the only difference is that the dry CO gas is replaced with dry N2, while the other steps and conditions are the same as in Example 1, to obtain the regenerated 4A molecular sieve (denoted as DC2).

[0075] Comparative Example 3

[0076] Following the method of Example 3, the only difference is that the dry acetylene gas is replaced with dry N2, while the other steps and conditions are the same as in Example 3, to obtain the regenerated 4A molecular sieve (denoted as DC3).

[0077] Comparative Example 4

[0078] The method of Example 4 was followed, except that the dry CO gas was replaced with dry N2. All other steps and conditions were the same as in Example 4, and the regenerated 4A molecular sieve (denoted as DC4) was obtained.

[0079] Comparative Example 5

[0080] Following the method of Example 5, the only difference is that the dry CO gas is replaced with dry N2, while the other steps and conditions are the same as in Example 5, to obtain the regenerated 4A molecular sieve (denoted as DC5).

[0081] Comparative Example 6

[0082] The method of Example 6 was followed, except that the mixture of dry CO gas and N2 gas was completely replaced with dry N2. All other steps and conditions were the same as in Example 6, and the regenerated 4A molecular sieve (denoted as DC6) was obtained.

[0083] Table 1

[0084]

[0085] As shown in Table 1, the dehydration and regeneration method of the molecular sieve desiccant of the present invention can remove most of the water from the molecular sieve desiccant in a relatively short time. Compared with conventional thermal dehydration methods under the same parameter conditions (e.g., the methods of Comparative Examples 1-6), the dehydration depth is greater. In other words, to obtain the same dehydration depth, the method of the present invention requires a lower dehydration and regeneration temperature or a shorter dehydration and regeneration time.

[0086] Test case

[0087] Using the above-mentioned 4A molecular sieve raw material, crude ethanol (with a water content of approximately 5% by weight) was dehydrated in the following manner:

[0088] 8g of the above-mentioned 4A molecular sieve desiccant (fresh) was loaded into a trickle bed reactor, and the above-mentioned crude ethanol was introduced to dehydrate (absorb water) to obtain dehydrated ethanol; then the water-absorbed molecular sieve was dehydrated and regenerated using the methods of Example 4 and Comparative Example 4 to obtain regenerated molecular sieve.

[0089] The above-mentioned regenerated molecular sieve was used to perform the above-mentioned crude ethanol dehydration treatment and molecular sieve dehydration and regeneration treatment 10 times in a cycle (the first water absorption and dehydration regeneration are referred to as the first time). The water content of ethanol after the first 4 dehydration treatments is shown in Table 2.

[0090] Among them, the regenerated molecular sieve obtained after 10 regenerations under the dehydration and regeneration conditions of Example 4 was subjected to XRD testing, and the results are as follows: Figure 1 As shown, from Figure 1 As can be seen, after up to 10 water absorption / dehydration regeneration cycles, the structure of the regenerated 4A molecular sieve remains intact compared to the unused fresh 4A molecular sieve.

[0091] Table 2

[0092]

[0093] As can be seen from Table 2, under the same dehydration and regeneration temperature and time conditions, the molecular sieve desiccant dehydrated by the method of the present invention has a better dehydration effect on aqueous ethanol, and can still maintain a stable dehydration rate after multiple water absorption / dehydration regeneration cycles.

[0094] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for dehydrating and regenerating a molecular sieve desiccant, characterized in that, include: In the presence of regeneration gas, a water-containing molecular sieve desiccant is dehydrated and regenerated to obtain a regenerated molecular sieve desiccant. The regenerated gas contains an active small molecule gas that can react with water, and the volume content of the active small molecule gas in the regenerated gas is 50-100%; the active small molecule gas is carbon monoxide. The temperature for dehydration and regeneration is 100-250℃.

2. The method according to claim 1, wherein, The conditions for dehydration and regeneration include: a temperature of 100-180℃ and a time of 0.5-120 min.

3. The method according to claim 2, wherein, The conditions for dehydration and regeneration include: a temperature of 130-150℃ and a time of 5-30 minutes.

4. The method according to claim 1, wherein, During the dehydration and regeneration process, the volume hourly space velocity of the regeneration gas is 1.8-1800 L / g. 分子筛 / h.

5. The method according to claim 4, wherein, During the dehydration and regeneration process, the volume hourly space velocity of the regeneration gas is 36-720 L / g. 分子筛 / h.

6. The method according to claim 1, wherein, The molecular sieve desiccant has a silicon-to-aluminum molar ratio of (1-500):1, a pore volume of 0.1-2 mL / g, and a specific surface area of ​​100-1000 m². 2 / g.

7. The method according to claim 6, wherein, The molecular sieve desiccant is selected from at least one of molecular sieves having an LTA topology, a FAU topology, an MFI topology, a BEA topology, a MOR topology, and an MWW topology.

8. The application of the regenerated molecular sieve desiccant prepared by the method according to any one of claims 1-7 in the dehydration treatment of materials.

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