Alcohol-water separation system and method

Abstract

The invention provides an alcohol-water separation system and method. The alcohol-water separation system comprises an adsorption tower, an alcohol-water mixed liquid storage tank and an alcohol product tank; the adsorption tower is filled with an MOF (Metal Organic Framework) material, and the MOF material comprises one or a combination of more than two of CALF-20, MOF-303, MOF-801, MOF-841 and MIL-101; a fluid outlet of the alcohol-water mixed liquid storage tank is connected with a tower top fluid channel opening of the adsorption tower, and a fluid inlet of the alcohol product tank is connected with a tower bottom fluid channel opening of the adsorption tower. The alcohol-water separation method comprises the steps that an alcohol-water mixed liquid phase system makes contact with an MOF material, the MOF material is used for adsorption dehydration treatment, and the residual liquid phase obtained after adsorption dehydration treatment is dehydrated alcohol; wherein the MOF material comprises one or a combination of more than two of CALF-20, MOF-303, MOF-801, MOF-841 and MIL-101, and the MOF material comprises one or more than two of CALF-20, MOF-303, MOF-801, MOF-841 and

Description

Technical Field

[0001] The invention relates to an alcohol-water separation system and method. Background Art

[0002] Alcohol-water separation is an important task in chemical separation, an indispensable operation unit in the production of fuel ethanol, and a typical high-energy consumption process. In addition, other organic alcohols, such as isopropanol and propylene alcohol, are important chemical products or raw materials, and their separation and purification from water are also particularly important. Under normal pressure conditions, the alcohol-water system will form an azeotropic mixture at a certain volume content. The traditional distillation method can no longer meet the needs of deep dehydration of organic alcohols, so there is an urgent need to develop new technologies for alcohol-water separation with high efficiency and low energy consumption.

[0003] At present, the main methods for separating alcohol from water include special distillation (including extractive distillation, azeotropic distillation, etc.), membrane separation, supercritical liquid extraction, etc. Special distillation has the characteristics of low equipment investment, relatively mature technology, high scale and mechanization, but its energy consumption is large and the operating conditions are harsh in the actual production process. Membrane separation (mainly pervaporation) uses the different dissolution and diffusion properties of different components of a liquid mixture through a permeable membrane to achieve the separation effect. Membrane separation technology has the advantages of low energy consumption, high efficiency, no pollution and easy maintenance, but it has the problems of difficult operation, poor durability, small processing volume, low product purity and high cost. Supercritical liquid extraction has the problems of large equipment investment and high energy consumption.

[0004] In the prior art, there are reports on the use of molecular sieve materials to separate alcohol from water. Specifically, the molecular sieve (powder or molded material) is loaded into an adsorption tower, superheated steam is introduced into the adsorption tower to contact the molecular sieve, and the gas discharged after adsorption by the molecular sieve is condensed to obtain anhydrous organic alcohol. This type of technology is simple to operate, has good reusability, high water absorption, and has lower separation energy consumption than special distillation methods; however, its regeneration takes a long time, and there are problems such as serious material loss in the adsorption and desorption cycle under drastic temperature changes; moreover, the vaporization process of the alcohol-water solution before entering the adsorption tower also brings about high energy consumption.

[0005] In summary, there is still a need to study technical solutions for alcohol-water separation that are high-efficiency, low-energy consumption, and easy to reuse reagents. Summary of the invention

[0006] The purpose of the present invention is to provide a technical solution for separating alcohol from water with high efficiency, low energy consumption and easy recycling of reagents.

[0007] In order to achieve the above objectives, the present invention proposes two technical solutions.

[0008] In a first aspect, the present invention provides an alcohol-water separation system, wherein the system comprises an adsorption tower, an alcohol-water mixed liquid storage tank, and an alcohol product tank;

[0009] The adsorption tower is filled with MOF material, and the MOF material includes one or a combination of two or more of CALF-20, MOF-303, MOF-801, MOF-841, and MIL-101;

[0010] The fluid outlet of the alcohol-water mixed liquid storage tank is connected to the top fluid channel port of the adsorption tower, and the fluid inlet of the alcohol product tank is connected to the bottom fluid channel port of the adsorption tower.

[0011] The alcohol-water separation system provided by the present invention can realize that the alcohol-water mixed liquid phase system in the alcohol-water mixed liquid storage tank enters the adsorption tower from the top of the adsorption tower and contacts with a specific type of MOF material in the adsorption tower to perform adsorption dehydration treatment, and the remaining liquid phase after the adsorption dehydration treatment is the dehydrated alcohol, which is discharged from the bottom of the adsorption tower into the alcohol product tank for storage. The alcohol-water separation system provided by the present invention can realize the separation of water in the alcohol-water mixed liquid phase system through a specific type of MOF material without gasification treatment, thereby achieving the purpose of high efficiency, low energy consumption, and easy reuse of adsorption reagents.

[0012] According to a preferred embodiment of the first aspect, the system includes a nitrogen heating device; the bottom fluid channel port of the adsorption tower is connected to a nitrogen source, and the nitrogen heating device is arranged on a connecting pipeline between the bottom fluid channel port of the adsorption tower and the nitrogen source; the top fluid channel port of the adsorption tower is connected to a desorbed gas discharge channel;

[0013] This preferred technical solution can achieve the following steps: heating nitrogen and then transporting it from the bottom of the adsorption tower to the adsorption tower to contact with a specific type of MOF material in the adsorption tower, and performing desorption and regeneration treatment on the MOF material. The desorbed gas after the desorption and regeneration treatment is discharged from the top of the adsorption tower into the desorption gas discharge channel, thereby completing the regeneration of the MOF material and realizing the reuse of the MOF material.

[0014] According to a preferred embodiment of the first aspect, the system comprises two or more adsorption towers connected in parallel.

[0015] According to a preferred embodiment of the first aspect, the pipelines connected to the top fluid channel opening of the adsorption tower are all provided with control valves.

[0016] According to a preferred embodiment of the first aspect, the pipelines connected to the bottom fluid channel opening of the adsorption tower are all provided with control valves.

[0017] In a second aspect, the present invention provides a method for separating alcohol from water, wherein the method comprises:

[0018] The alcohol-water mixed liquid phase system is in contact with the MOF material, and the MOF material is used for adsorption and dehydration treatment, and the remaining liquid phase after the adsorption and dehydration treatment is the dehydrated alcohol;

[0019] The MOF material includes one or a combination of two or more of CALF-20, MOF-303, MOF-801, MOF-841, and MIL-101.

[0020] The alcohol-water separation method provided by the present invention realizes the separation of water in the alcohol-water mixed liquid phase system through a specific type of MOF material without gasification treatment. The alcohol-water separation method provided by the present invention has high efficiency, low energy consumption, and the adsorption reagent MOF material is easy to reuse.

[0021] According to a preferred embodiment of the second aspect, the alcohol-water separation method is performed using the alcohol-water separation system provided by the first aspect of the present invention.

[0022] According to a preferred embodiment of the second aspect, the shape of the MOF material may be, but is not limited to, powder, flake particles, spherical particles or columnar particles.

[0023] According to a preferred embodiment of the second aspect, the mass fraction of alcohol in the alcohol-water mixed liquid phase system is 85%-99%, based on the mass of the alcohol-water mixed liquid phase system being 100%.

[0024] According to a preferred embodiment of the second aspect, the alcohol in the alcohol-water mixed liquid phase system comprises one or a combination of two or more of methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, ethylene glycol and propylene alcohol.

[0025] According to a preferred embodiment of the second aspect, the mass flow rate of the alcohol-water mixed liquid phase system to the mass ratio of the MOF material (i.e., mass space velocity) is 3-50 kg·h -1 / kg.

[0026] According to a preferred embodiment of the second aspect, the contact time between the alcohol-water mixed liquid phase system and the MOF material is not less than 1 min;

[0027] More preferably, the contact time between the alcohol-water mixed liquid phase system and the MOF material is 1-40 min.

[0028] According to a preferred embodiment of the second aspect, the alcohol-water mixed liquid phase system is contacted with the MOF material, and the MOF material is used for adsorption and dehydration treatment at room temperature.

[0029] According to a preferred embodiment of the second aspect, the alcohol-water mixed liquid phase system is contacted with the MOF material, and the MOF material is used for adsorption dehydration treatment, which is carried out under normal pressure-1 MPa conditions.

[0030] According to a preferred embodiment of the second aspect, the method further comprises: using 80-150° C. hot nitrogen to purge the MOF material after the adsorption dehydration treatment at 0.1-0.8 MPa, and reusing the purged MOF material for the adsorption dehydration treatment;

[0031] More preferably, the gas velocity of the hot nitrogen is 0.2-3.0 m / s;

[0032] More preferably, the purge time is 20-60 min.

[0033] The technical solution provided by the present invention is to adsorb water in an alcohol-water mixed liquid phase system by a specific type of MOF material (a combination of one or more of CALF-20, MOF-303, MOF-801, MOF-841, and MIL-101), without the need for vaporization. When the alcohol-water mixed liquid phase system contacts these specific types of MOF materials, the water molecules in the alcohol-water mixed liquid phase system can be attached to the active sites of these specific types of MOF materials, and these specific types of MOF materials are conducive to the dispersion of water molecules, weaken the formation of the water hydrogen bond network structure, so that more water molecules are captured, and the alcohol-water separation efficiency is greatly improved. By these specific types of MOF materials, a higher water absorption is achieved in a very short time in a high-concentration alcohol-water mixed liquid phase system, and alcohol-water separation is achieved with high efficiency and low energy consumption. In addition, the technical solution provided by the present invention uses specific types of MOF materials (one or a combination of two or more of CALF-20, MOF-303, MOF-801, MOF-841, MIL-101) to separate alcohol from water, and these specific types of MOF materials are easy to reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of the alcohol-water separation system provided in Example 1. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0036] Example 1

[0037] This embodiment provides an alcohol-water separation system.

[0038] like Figure 1As shown, the alcohol-water separation system includes a first adsorption tower 1, a second adsorption tower 2, an alcohol-water mixed liquid storage tank 3, an alcohol product tank 4, and a nitrogen heating device 5.

[0039] The first adsorption tower 1 and the second adsorption tower 2 are two identical adsorption towers filled with the same MOF material, wherein the MOF material includes one or a combination of two or more of CALF-20, MOF-303, MOF-801, MOF-841, and MIL-101.

[0040] The fluid outlet of the alcohol-water mixed liquid storage tank 3 is connected to the top fluid channel ports of the first adsorption tower 1 and the second adsorption tower 2 respectively; a valve V3 is provided on the connecting pipeline between the fluid outlet of the alcohol-water mixed liquid storage tank 3 and the top fluid channel port of the first adsorption tower 1; a valve V5 is provided on the connecting pipeline between the fluid outlet of the alcohol-water mixed liquid storage tank 3 and the top fluid channel port of the second adsorption tower 2.

[0041] The fluid inlet of the alcohol product tank 4 is connected to the bottom fluid channel ports of the first adsorption tower 1 and the second adsorption tower 2 respectively; a valve V1 is provided on the connecting pipeline between the fluid inlet of the alcohol product tank 4 and the bottom fluid channel port of the first adsorption tower 1; a valve V7 is provided on the connecting pipeline between the fluid inlet of the alcohol product tank 4 and the bottom fluid channel port of the second adsorption tower 2.

[0042] The fluid channel openings at the bottom of the first adsorption tower 1 and the second adsorption tower 2 are respectively connected to the fluid outlet of the nitrogen heating device 5; a valve V2 is provided on the connecting pipeline between the first adsorption tower 1 and the fluid outlet of the nitrogen heating device 5; a valve V8 is provided on the connecting pipeline between the second adsorption tower 2 and the fluid outlet of the nitrogen heating device 5; the fluid inlet of the nitrogen heating device 5 is connected to the nitrogen source; a valve V9 is provided on the connecting pipeline between the fluid inlet of the nitrogen heating device 5 and the nitrogen source.

[0043] The top fluid channel openings of the first adsorption tower 1 and the second adsorption tower 2 are respectively connected to the desorption gas discharge channel; a valve V4 is provided on the connecting pipeline between the first adsorption tower 1 and the desorption gas discharge channel, and a valve V6 is provided on the connecting pipeline between the second adsorption tower 2 and the desorption gas discharge channel.

[0044] Example 2

[0045] This embodiment provides a method for separating alcohol from water.

[0046] The method is carried out using the alcohol-water separation system provided by Example 1 of the present invention, and the method comprises:

[0047] 1) The alcohol-water mixed liquid storage tank 3 is filled with industrial alcohol having an ethanol mass percentage of 94.94% in the alcohol-water mixed liquid phase system; the first adsorption tower 1 is filled with 200 kg of MOF material CALF-20 (average particle size of 5 μm) with a filling height of 1.25 m; the second adsorption tower 2 is filled with 200 kg of MOF material CALF-20 with a filling height of 1.25 m.

[0048] 2) Open valve V3 and valve V1, and close the remaining valves;

[0049] The alcohol-water mixed liquid phase system in the alcohol-water mixed liquid storage tank 3 enters the first adsorption tower 1 through the fluid channel port at the top of the first adsorption tower 1, contacts with the MOF material filled in the first adsorption tower 1 for adsorption dehydration treatment, and the remaining liquid phase after the adsorption dehydration treatment, i.e., the dehydrated alcohol, is discharged from the fluid channel port at the bottom of the first adsorption tower 1 into the alcohol product tank 4 for storage until the treatment mass of the alcohol-water mixed liquid phase system reaches 2000kg, and the valve V3 and valve V1 are closed; wherein, the adsorption dehydration treatment is carried out at room temperature and normal pressure, the alcohol-water mixed liquid phase system stays in the first adsorption tower 1 for 3min, and the mass flow rate ratio of the alcohol-water mixed liquid phase system to the mass of the MOF material (i.e., the mass space velocity) is 10kg·h -1 / kg.

[0050] 3) Open valve V5, valve V7, valve V9, valve V2, valve V4, and close the remaining valves;

[0051] The alcohol-water mixed liquid phase system in the alcohol-water mixed liquid storage tank 3 enters the second adsorption tower 2 through the fluid channel port at the top of the second adsorption tower 2, contacts with the MOF material filled in the second adsorption tower 2 for adsorption dehydration treatment, and the remaining liquid phase after the adsorption dehydration treatment, i.e., the dehydrated alcohol, is discharged from the fluid channel port at the bottom of the second adsorption tower 2 into the alcohol product tank 4 for storage until the treatment mass of the alcohol-water mixed liquid phase system reaches 2000kg, and then valves V5, V7, V9, V2, and V4 are closed; wherein, the adsorption dehydration treatment is carried out at room temperature and normal pressure, the alcohol-water mixed liquid phase system stays in the second adsorption tower 2 for 3min, and the mass flow rate ratio of the alcohol-water mixed liquid phase system to the mass of the MOF material (i.e., mass space velocity) is 10 kg·h -1 / kg.

[0052] At the same time, the nitrogen in the nitrogen source is heated to 120° C. by the nitrogen heating device 5 to obtain hot nitrogen, and the hot nitrogen enters the first adsorption tower 1 through the bottom fluid channel port of the first adsorption tower 1 to purge the MOF material after the adsorption and dehydration treatment in the first adsorption tower 1, and the desorbed gas after the purge is discharged through the top fluid channel port of the first adsorption tower 1 to the desorption gas discharge channel for external discharge; wherein, during the purge process, the pressure in the first adsorption tower 1 is 0.3 MPa, the purge time is 30 min, and the gas velocity of the hot nitrogen is 2 m / s.

[0053] 4) Open valve V3, valve V1, valve V9, valve V8, valve V6, and close the remaining valves;

[0054] The alcohol-water mixed liquid phase system in the alcohol-water mixed liquid storage tank 3 enters the first adsorption tower 1 through the fluid channel port at the top of the first adsorption tower 1, contacts with the MOF material filled in the first adsorption tower 1 for adsorption dehydration treatment, and the remaining liquid phase after the adsorption dehydration treatment, i.e., the dehydrated alcohol, is discharged from the fluid channel port at the bottom of the first adsorption tower 1 into the alcohol product tank 4 for storage until the treatment mass of the alcohol-water mixed liquid phase system reaches 2000kg, and the valve V3 and valve V1 are closed; wherein, the adsorption dehydration treatment is carried out at room temperature and normal pressure, the alcohol-water mixed liquid phase system stays in the first adsorption tower 1 for 3min, and the mass flow rate ratio of the alcohol-water mixed liquid phase system to the mass of the MOF material (i.e., the mass space velocity) is 10kg·h -1 / kg.

[0055] At the same time, the nitrogen in the nitrogen source is heated to 120° C. by the nitrogen heating device 5 to obtain hot nitrogen, and the hot nitrogen enters the second adsorption tower 2 through the bottom fluid channel port of the second adsorption tower 2 to purge the MOF material after the adsorption and dehydration treatment in the second adsorption tower 2, and the desorbed gas after the purge is discharged through the top fluid channel port of the second adsorption tower 2 to the desorption gas discharge channel for external discharge; wherein, during the purge process, the pressure in the second adsorption tower 2 is 0.3 MPa, the purge time is 30 min, and the gas velocity of the hot nitrogen is 0.2-3.0 m / s.

[0056] 5) Repeat steps 3) and 4).

[0057] The water content of the product in the alcohol product tank 4 was tested regularly, and the result showed that the mass percentage of water was always maintained at (0.49851±0.001)%, as shown in Table 1.

[0058] After each desorption and regeneration operation, the material's ability to adsorb water does not decrease significantly, and XRD, solid infrared and other characterizations also show that the structure of the MOF material has no obvious changes after repeated use. Considering the material consumption rate, a batch of materials needs to be replaced every three years.

[0059] Example 2

[0060] This embodiment provides a method for separating alcohol from water.

[0061] The difference between the alcohol-water separation method provided in this embodiment and the alcohol-water separation method provided in Example 1 is that the MOF material used is different. The MOF material used in this embodiment is MOF-303 instead of CALF-20.

[0062] The water content of the product in the alcohol product tank 4 was tested regularly, and the result showed that the mass percentage of water was always maintained at (0.49902±0.001)%, as shown in Table 1.

[0063] Example 4

[0064] This embodiment provides a method for separating alcohol from water.

[0065] The difference between the alcohol-water separation method provided in this embodiment and the alcohol-water separation method provided in Example 1 is that different MOF materials are used. The MOF material used in this embodiment is MOF-801 instead of CALF-20.

[0066] The water content of the product in the alcohol product tank 4 was tested regularly, and the result showed that the mass percentage of water was always maintained at (0.48124±0.001)%, as shown in Table 1.

[0067] Example 5

[0068] This embodiment provides a method for separating alcohol from water.

[0069] The difference between the alcohol-water separation method provided in this embodiment and the alcohol-water separation method provided in Example 1 is that the MOF material used is different. The MOF material used in this embodiment is MOF-841 instead of CALF-20.

[0070] The water content of the product in the alcohol product tank 4 was tested regularly, and the results showed that the mass percentage of water was always maintained at (0.50421±0.001)%, as shown in Table 1.

[0071] Example 6

[0072] This embodiment provides a method for separating alcohol from water.

[0073] The difference between the alcohol-water separation method provided in this embodiment and the alcohol-water separation method provided in Example 1 is that the MOF material used is different. The MOF material used in this embodiment is MOF-101 instead of CALF-20.

[0074] The water content of the product in the alcohol product tank 4 was tested regularly, and the results showed that the mass percentage of water was always maintained at (0.52143±0.001)%, as shown in Table 1.

[0075] Comparative Example 1

[0076] This comparative example provides a method for separating alcohol from water.

[0077] The method is carried out using the alcohol-water separation system provided by Example 1 of the present invention, and the method comprises:

[0078] 1) The alcohol-water mixed liquid storage tank 3 is filled with industrial alcohol having an alcohol-water mixed liquid phase system with an ethanol mass percentage of 94.94%; the first adsorption tower 1 is filled with 200 kg of 4A molecular sieve (average particle size of 5 μm) with a filling height of 1.25 m; the second adsorption tower 2 is filled with 200 kg of 4A molecular sieve with a filling height of 1.25 m.

[0079] 2) Open valve V3 and valve V1, and close the remaining valves;

[0080] The alcohol-water mixed liquid phase system in the alcohol-water mixed liquid storage tank 3 enters the first adsorption tower 1 through the fluid channel port at the top of the first adsorption tower 1, contacts with the 4A molecular sieve filled in the first adsorption tower 1 for adsorption dehydration treatment, and the remaining liquid phase after the adsorption dehydration treatment, i.e., the dehydrated alcohol, is discharged from the fluid channel port at the bottom of the first adsorption tower 1 into the alcohol product tank 4 for storage until the treatment mass of the alcohol-water mixed liquid phase system reaches 2000kg, and the valve V3 and valve V1 are closed; wherein, the adsorption dehydration treatment is carried out at room temperature and normal pressure, the alcohol-water mixed liquid phase system stays in the first adsorption tower 1 for 3min, and the mass ratio of the mass flow rate of the alcohol-water mixed liquid phase system to the mass of the 4A molecular sieve (i.e., the mass space velocity) is 10kg·h -1 / kg.

[0081] 3) Open valve V5 and valve V7, and close the remaining valves;

[0082] The alcohol-water mixed liquid phase system in the alcohol-water mixed liquid storage tank 3 enters the second adsorption tower 2 through the fluid channel port at the top of the second adsorption tower 2, contacts with the 4A molecular sieve filled in the second adsorption tower 2 for adsorption dehydration treatment, and the remaining liquid phase after the adsorption dehydration treatment, i.e., the dehydrated alcohol, is discharged from the fluid channel port at the bottom of the second adsorption tower 2 into the alcohol product tank 4 for storage, until the treatment mass of the alcohol-water mixed liquid phase system reaches 2000kg, and valves V5, V7, V9, V2, and V4 are closed; wherein, the adsorption dehydration treatment is carried out at room temperature and normal pressure, the alcohol-water mixed liquid phase system stays in the second adsorption tower 2 for 3min, and the mass ratio of the mass flow rate of the alcohol-water mixed liquid phase system to the mass of the 4A molecular sieve (i.e., the mass space velocity) is 10kg·h -1 / kg.

[0083] The product in the alcohol product tank 4 was tested for water content, and the result was: the mass percentage of water was 1.09961%.

[0084] Comparative Example 2

[0085] This comparative example provides a method for separating alcohol from water.

[0086] The difference between the alcohol-water separation method provided in this comparative example and the alcohol-water separation method provided in comparative example 1 is only that the filling materials in the first adsorption tower 1 and the second adsorption tower 2 in the two comparative examples are different. The filling material in the first adsorption tower 1 and the second adsorption tower 2 in this comparative example is activated carbon, not 4A molecular sieve.

[0087] The product in the alcohol product tank 4 was tested for water content, and the result was: the mass percentage of water was 2.13047%.

[0088] Table 1

[0089]

[0090]

[0091] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims of the present invention.

Claims

1. An alcohol-water separation system, wherein: The system includes an adsorption tower, an alcohol-water mixed liquid storage tank, and an alcohol product tank; The adsorption tower is filled with MOF material, and the MOF material includes one or a combination of two or more of CALF-20, MOF-303, MOF-801, MOF-841, and MIL-101; The fluid outlet of the alcohol-water mixed liquid storage tank is connected to the top fluid channel port of the adsorption tower, and the fluid inlet of the alcohol product tank is connected to the bottom fluid channel port of the adsorption tower.

2. The alcohol-water separation system according to claim 1, wherein: The system comprises a nitrogen heating device; a bottom fluid channel port of an adsorption tower is connected to a nitrogen source, and the nitrogen heating device is arranged on a connecting pipeline between the bottom fluid channel port of the adsorption tower and the nitrogen source; and a top fluid channel port of the adsorption tower is connected to a desorbed gas discharge channel.

3. A method for separating alcohol from water, wherein: The method includes: The alcohol-water mixed liquid phase system is in contact with the MOF material, and the MOF material is used for adsorption and dehydration treatment, and the remaining liquid phase after the adsorption and dehydration treatment is the dehydrated alcohol; The MOF material includes one or a combination of two or more of CALF-20, MOF-303, MOF-801, MOF-841, and MIL-101.

4. The alcohol-water separation method according to claim 3, wherein: The alcohol-water separation method is carried out using the alcohol-water separation system described in claim 1 or 2.

5. The alcohol-water separation method according to claim 3 or 4, wherein: Taking the mass of the alcohol-water mixed liquid phase system as 100%, the mass fraction of alcohol in the alcohol-water mixed liquid phase system is 85%-99%.

6. The alcohol-water separation method according to claim 3 or 4, wherein: The alcohol in the alcohol-water mixed liquid phase system comprises one or a combination of two or more of methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, ethylene glycol and propylene alcohol.

7. The method for separating alcohol from water according to claim 3 or 4, wherein: The mass flow rate of the alcohol-water mixed liquid phase system and the mass ratio of the MOF material are 3-50 kg·h -1 / kg; and / or The alcohol-water mixed liquid phase system is contacted with the MOF material, and the MOF material is used for adsorption and dehydration treatment at room temperature; and / or The alcohol-water mixed liquid phase system is in contact with the MOF material, and the MOF material is used for adsorption and dehydration treatment at normal pressure -1MPa.

8. The method for separating alcohol from water according to claim 3 or 4, wherein: The contact time between the alcohol-water mixed liquid phase system and the MOF material is not less than 1 min; Preferably, the contact time between the alcohol-water mixed liquid phase system and the MOF material is 1-40 min.

9. The method for separating alcohol from water according to claim 3 or 4, wherein: The method also includes: using 80-150° C. hot nitrogen to purge the MOF material after the adsorption and dehydration treatment under 0.1-0.8 MPa conditions, and the purged MOF material is reused for the adsorption and dehydration treatment.

10. The method for separating alcohol from water according to claim 9, wherein: The gas velocity of the hot nitrogen is 0.2-3.0 m / s; and / or The purge time is 20-60 minutes.

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