Preparation method of hollow fiber carbon dioxide separation membrane assembly

Abstract

The invention relates to the technical field of hollow fiber carbon dioxide separation membrane components, and discloses a preparation method of a hollow fiber carbon dioxide separation membrane component, which comprises a coating stage and a drying stage, in the coating stage, a partitioning device is placed in the center of the to-be-coated assembly to block a central membrane wire hole of the membrane assembly, after the separation membrane liquid completely flows out of the lower end of the membrane assembly, the partitioning device is taken out, the separation membrane liquid is poured into the membrane assembly again from the upper end of the membrane assembly, and primary coating of the assembly is completed; in the drying stage, hot air is adopted to dry the rotating membrane module, the drying temperature is 50-80 DEG C, the hot air volume is 1-5 L / min, and the drying time is 2-4 h. The invention provides a method for modularly manufacturing a hollow fiber CO2 separation membrane assembly in modes of partitioned coating, vacuumizing, rotary drying and the like. The manufacturing process of the hollow fiber CO2 separation membrane assembly is simplified, and the production and manufacturing cost of the membrane assembly is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hollow fiber carbon dioxide separation membrane components, and in particular to a preparation method of a hollow fiber carbon dioxide separation membrane component. Background Art

[0002] Carbon capture, utilization and storage (CCUS) is a highly promising way to reduce CO2 emissions. As the second generation of carbon capture technology, membrane carbon capture technology uses the differences in the dissolution, diffusion and reaction properties of CO2 and other gases in membrane materials to separate CO2. It has the advantages of low energy consumption, no secondary pollution, small footprint, no significant amplification effect, and applicability to various processing scales.

[0003] CO2 separation membrane technology refers to the use of the difference in the permeation rate of CO2 and other gas molecules such as N2 in the membrane to achieve separation. The CO2 separation membrane assembly is the core of achieving the separation of CO2 from the mixed gas; the development and large-scale preparation of high-performance CO2 separation membrane assemblies is one of the keys to membrane carbon capture technology. At present, flat membranes and hollow fiber membranes are the two main forms of membranes. Because hollow fiber membranes have high packing density, strong pressure resistance, and can withstand high pressure, and if there is damage in a certain place in the hollow fiber membrane, the air inlet end of the membrane can be blocked and reused, which basically does not affect the performance of the membrane assembly. These advantages have attracted a certain degree of attention in the industry. However, the preparation of hollow fiber CO2 separation membrane assemblies is not mature enough at this stage, and is basically still in the laboratory research stage. The laboratory usually prepares membrane separation components by manual coating. The CO2 separation membrane liquid is poured into a coating chamber connected to one end of the membrane component. The separation membrane liquid flows downward along the hollow fiber membrane filaments under the action of gravity and is coated on the membrane filament wall. The excess separation membrane liquid flows into the beaker from the lower end of the membrane component. The CO2 separation membrane liquid collected in the beaker will be reused. After one coating, the membrane group is placed in an oven for drying. After drying, the component is coated multiple times and then dried to complete the component production.

[0004] This coating method has the problem of uneven coating when the diameter of the membrane module is large (≥1000 membrane filaments), resulting in thicker coating on the membrane filaments in the center of the module and thinner coating near the membrane shell. When drying in an oven, the membrane module is placed vertically, causing the membrane liquid at the upper end of the membrane filaments in the module to flow downward, forming a liquid column at the lower end of the membrane filaments in the module, which may clog the membrane pores of the membrane filaments and slow down the drying speed of the membrane filaments, which is not conducive to the formation of a uniform thin film of CO2 separation membrane liquid on the membrane filament wall, resulting in a decrease in the performance of the membrane module.

[0005] In the prior art, Chinese patent CN 220589512 U discloses a one-step method for overall coating of a CO2 separation membrane group. The one-step method overall coating of a CO2 separation membrane assembly, the inner wall and the outer surface of the hollow fiber membrane are bonded with a uniformly distributed first coating membrane and a second coating membrane, the overall coating process of the membrane assembly simplifies the membrane preparation process, avoids the use of expensive continuous coating machines, and can achieve coating of the inner and outer sides of the membrane, greatly improving the coating efficiency of the membrane assembly, strengthening the transmission of CO2 in the membrane assembly, improving the CO2 separation effect, and reducing the effective membrane area required for the membrane assembly. First of all, this scheme has the problem of high coating difficulty. The diameter of the hollow fiber membrane is relatively small, generally less than 3 mm. It is difficult to coat multiple layers of other membrane layers inside and outside the membrane filament. At the same time, when the diameter of the separation membrane assembly is large, it cannot be evenly coated. Secondly, the coarse-effect filtration membrane layer, fine-effect filtration membrane layer, activated carbon filtration membrane layer and nanofiber filtration membrane layer designed make the separation membrane too thick, which is not conducive to the passage of CO2 gas, increases the resistance of the assembly, and may also cause the performance of the assembly to decrease. Chinese patent CN 118347260 B discloses a drying device for hollow fiber membrane production. The scheme discloses a drying device for hollow fiber membrane production, which includes an upper heat drying tube and a lower heat drying tube which are arranged in an upper and lower opposite manner, and the two ports of the upper heat drying tube and the lower heat drying tube are aligned with each other, the structural dimensions of the upper heat drying tube and the lower heat drying tube are consistent, and hollow fiber membrane materials in a stretched and unfolded state are placed at the opposing centers of the two. The upper heat drying tube and the lower heat drying tube are opened and closed by an opening and closing unit, and the hollow fiber membrane materials are close to the limit position. Then, the hollow fiber membrane materials are subjected to multi-stage heat drying treatment during the winding and conveying process by the heat drying unit to avoid the dissipation of evaporated water vapor, so that the hollow fiber membrane materials can be effectively dried with a smaller footprint. In addition, during the heat drying process of the hollow fiber membrane materials, the hollow fiber membrane materials can be twisted by the twisting unit, so that the internal structure of the hollow fiber membrane can be more fully heat-dried. This solution is to dry the hollow fiber membrane before packaging it into a component, and it is mainly for drying the hollow fiber membrane formed once. The preparation of the hollow fiber membrane component also requires secondary coating on the surface of the hollow fiber. The coated separation layer is thin. Using this method may cause the separation layer to be damaged, resulting in a decrease in the performance of the hollow fiber membrane component. Therefore, it is of great significance in the industry to develop a new hollow fiber carbon dioxide separation membrane component preparation process to avoid the above problems. Summary of the invention

[0006] The present invention aims to provide a method for preparing a hollow fiber carbon dioxide separation membrane assembly to solve the problems in the prior art of uneven coating when the membrane assembly has a large diameter and the formation of liquid columns in the membrane fibers during drying, which affects the performance of the membrane assembly.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for preparing a hollow fiber carbon dioxide separation membrane component, comprising a coating stage and a drying stage; in the coating stage, a partitioning device is placed at the center position of the component to be coated to block the central membrane filament holes of the membrane component, and after the separation membrane liquid completely flows out from the lower end of the membrane component, the partitioning device is taken out, and the separation membrane liquid is poured into the upper end of the membrane component again to complete one coating of the component.

[0008] Preferably, as an improvement, in the drying stage, hot air is used to dry the rotating membrane assembly, the drying temperature is 50-80°C, the hot air volume is 1-5L / min, and the drying time is 2-4h.

[0009] Preferably, as an improvement, the diameter of the partition device is 2 / 3 of the diameter of the membrane module.

[0010] Preferably, as an improvement, during the coating stage, the vertical distance between the CO2 separation membrane liquid storage tank and the membrane assembly to be coated is 1.5-3 m.

[0011] Preferably, as an improvement, the bottom end of the CO2 separation membrane liquid storage tank is connected to a metering pipe coaxially arranged therewith, the metering pipe is transparent, and scale lines are arranged on the metering pipe.

[0012] Preferably, as an improvement, a ball valve is provided between the CO2 separation membrane liquid storage tank and the metering pipeline, and a butterfly valve is provided at the bottom of the metering pipeline.

[0013] Preferably, as an improvement, a coating chamber is provided between the CO2 separation membrane liquid storage tank and the membrane assembly to be coated, the coating chamber is coaxially arranged with the metering pipeline, and the partitioning device is arranged in the coating chamber.

[0014] Preferably, as an improvement, the diameter of the coating chamber is the same as the diameter of the membrane assembly, both of which are 0.09-0.3 m, and a vacuum pump is provided below the membrane assembly.

[0015] Preferably, as an improvement, during the drying stage, the coated membrane assembly is connected to a gas distribution chamber, the other end of the gas distribution chamber is connected to a hot air blower, and a gas distributor is provided in the gas distribution chamber.

[0016] Preferably, as an improvement, the coated membrane assembly and the outside of the gas distribution chamber are both connected with a controllable pulley frame for support, so as to control the uniform rotation and rotation rate of the membrane assembly on the pulley frame.

[0017] The principles and advantages of this solution are: In this technical solution, in the early stage of research and development, there are many uncoated membrane filaments near the membrane shell of the membrane assembly, and the thickness of the separation membrane cannot be effectively controlled. In the drying stage, since the separation membrane liquid cannot solidify immediately after coating, the membrane liquid on the upper part of the assembly is retained in the lower part during drying, resulting in uneven distribution of the separation membrane liquid. At the same time, since there is water vapor inside the membrane filament during the drying process and it cannot overflow quickly, the drying time is long. In addition, in the early stage of research and development, direct filling and coating were adopted without partitioning. When the membrane assembly was checked for leaks, leaks appeared in a circle around the outer periphery of the assembly. When drying, the assembly was directly placed in a blast oven for drying. It was found that the drying time was long and separation membrane liquid dripped out from the lower part of the assembly. Based on this, this technical solution sets a partitioning device during the coating process, which can solve the problem that the membrane filaments close to the membrane shell cannot be effectively coated.

[0018] In summary, the beneficial effects of this technical solution are:

[0019] 1. This technical solution aims to solve the problems of uneven coating of the separation layer and poor dispersion of the separation layer during the drying process in the production process of hollow fiber CO2 separation membrane components, and comprehensively optimizes the coating process and drying process of hollow fiber CO2 separation membrane components. It proposes a modular method for producing hollow fiber CO2 separation membrane components by means of zoned coating + vacuuming + rotary drying; simplifies the production process of hollow fiber CO2 separation membrane components and reduces the production cost of membrane components.

[0020] 2. This technical solution ensures uniform distribution of the component membrane liquid through the method of zone coating + vacuuming, and there are no residual large droplets and liquid columns in the membrane fibers, thus solving the problem of uneven coating of the separation layer in the hollow fiber CO2 separation membrane component.

[0021] 3. This technical solution directly introduces hot air into the components through a distributor, solving the problem of uneven heating during the drying process of the hollow fiber CO2 separation membrane components.

[0022] 4. This technical solution solves the problem of poor separation layer dispersion during the drying process of the hollow fiber CO2 separation membrane assembly by setting up a controllable pulley frame.

[0023] 5. This technical solution is provided with a transparent metering pipeline below the liquid storage tank, which can control the amount of separation membrane liquid applied each time and ensure the accuracy of separation membrane liquid applied each time.

[0024] 6. This technical solution controls the temperature and air volume of the heating fan to ensure that the separation membrane liquid in the membrane filaments is quickly dried without destroying the formation of the separation membrane; the rotation speed of the membrane assembly can be adjusted through the controllable pulley frame to ensure that the membrane liquid is evenly distributed in the membrane filaments.

[0025] 7. The film thickness and smoothness were tested by SEM, and the performance of the module was tested by the performance test device. The results showed that when the coating was successful, the film was smooth and flat, the CO2 permeability of the module was ≥1500GPU, and the CO2 / N2 selectivity was ≥30. If the coating was not successful, wrinkles and holes appeared on the membrane surface, and the module had almost no CO2 / N2 selectivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the coating process structure in an embodiment of the present invention.

[0027] Figure 2 Schematic diagram of the drying process in the embodiment of the present invention.

[0028] Figure 3 Schematic diagram of a single-stage membrane module performance testing device in an embodiment of the present invention.

[0029] Figure 4 The SEM image of the membrane module successfully coated.

[0030] Figure 5 This is a SEM image of a membrane component that was not successfully coated. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementations, but the implementation of the present invention is not limited thereto. Unless otherwise specified, the technical means used in the following implementations are conventional means well known to those skilled in the art; the experimental methods used are all conventional methods; the materials, reagents, etc. used can all be obtained from commercial channels.

[0032] The figure marks in the drawings of the specification include: CO2 separation membrane liquid storage tank 1, ball valve 2, metering pipeline 3, manual butterfly valve 4, filling and coating chamber 5, quick connector chuck clamp 6, movable column 7, membrane assembly limit device 8, handle strap 9, CO2 separation membrane liquid collection container 10, CO2 separation membrane liquid pump 11, vacuum pump 12, fixed column 13, partition device 14, hot air blower 15, rotating structure 16, gas distribution chamber 17, membrane assembly 18, controllable pulley frame 19, gas distributor 20.

[0033] Embodiment 1 is basically as attached Figure 1-2 As shown:

[0034] A method for preparing a hollow fiber carbon dioxide separation membrane module comprises the following steps:

[0035] Step 1: Coating of hollow fiber CO2 separation membrane components: Use Figure 1The hollow fiber CO2 separation membrane assembly coating device shown in the figure is coated. The structure of the hollow fiber CO2 separation membrane assembly coating device includes a fixed column 13 and a movable column 7. A CO2 separation membrane liquid storage tank 1 is arranged on the fixed column 13. The fixed position of the CO2 separation membrane liquid storage tank 1 can be moved up and down along the fixed column 13. The specific fixing method can be snap-on fixing or clamp fixing, etc. The installation height of the CO2 separation membrane liquid storage tank 1 is 1.5-3m. A metering pipe 3 coaxially arranged therewith is fixed at the bottom of the CO2 separation membrane liquid storage tank 1. The metering pipe 3 is transparently arranged and has scale lines on it. A ball valve 2 is arranged between the metering pipe 3 and the CO2 separation membrane liquid storage tank 1, and a manual butterfly valve 4 is arranged at the bottom of the metering pipe 3.

[0036] A coating chamber 5 is also fixed on the fixed column 13 , and the coating chamber 5 is coaxially arranged with the metering pipeline 3 .

[0037] The movable column 7 is provided with a membrane assembly 18, which is fixed to the movable column 7 by means of a membrane assembly stopper 8 and a hand strap 9. The surface where the membrane assembly stopper 8 contacts the membrane assembly 18 is provided with a silicone gasket to increase the friction between the membrane assembly 18 and the membrane assembly stopper 8, while protecting the outer shell of the membrane assembly 18; a hand strap 9 is fixed at one end of the membrane assembly stopper 8, and a buckle is provided at the other end of the hand strap 9 and the other end of the membrane assembly stopper 8, so as to facilitate the fixing of the membrane assembly 18. In this embodiment, the diameter of the coating chamber 5 is the same as that of the membrane assembly 18, so as to facilitate the fixing of the coating chamber 5 and the membrane assembly 18, and the specific diameter is 0.09-0.2m.

[0038] A CO2 separation membrane liquid collection container 10 is arranged below the membrane assembly 18. The diameter of the CO2 separation membrane liquid collection container 10 is the same as that of the membrane assembly 18, and the CO2 separation membrane liquid collection container 10 is coaxially arranged with the CO2 separation membrane liquid storage tank 1 and the metering pipeline 3. The side of the CO2 separation membrane liquid collection container 10 is connected with a reflux pipeline, and a CO2 separation membrane liquid pump 11 is arranged on the reflux pipeline to ensure that the separation membrane liquid collected by the CO2 separation membrane liquid collection container 10 can be pumped into the CO2 separation membrane liquid storage tank 1 in time, thereby improving the utilization rate of the separation membrane liquid. Roots of pipelines are evenly distributed around the upper end of the CO2 separation membrane liquid collection container 10, and the pipelines are connected by a through connection and then merged into the inlet of the vacuum pump 12, and the vacuum pump 12 is arranged between the membrane assembly 18 and the CO2 separation membrane liquid collection container 10.

[0039] The specific process of coating the hollow fiber CO2 separation membrane module 18 is as follows:

[0040] (1) Move the movable column 7 that fixes the membrane assembly 18 to the bottom of the coating chamber 5, and use the quick connector clamp 6 to fix the upper end of the membrane assembly 18 to the coating chamber 5, and fix the lower end of the membrane assembly 18 to the CO2 separation membrane liquid collection container 10;

[0041] (2) A partition device 14 is placed at the center of the membrane assembly 18. The diameter of the partition device 14 is about 2 / 3 of the diameter of the membrane assembly 18. The bottom of the partition device 14 is made of soft silicone, which can block the central membrane thread hole of the membrane assembly 18 to ensure that the membrane liquid does not flow into the membrane thread;

[0042] (3) Close the manual butterfly valve 4, open the ball valve 2, and introduce the required amount of separation membrane liquid into the metering pipe 3 to ensure that the separation membrane liquid can form a liquid level of 50-80 mm in the coating chamber 5; turn on the vacuum pump 12 and maintain the vacuum degree of the vacuum pump 12 at -10 to -20 kPa;

[0043] (4) Close the ball valve 2, quickly and completely open the manual butterfly valve 4, so that the solution in the metering pipe 3 quickly flows into the coating chamber 5, and forms a liquid level of 30-60 mm in the coating chamber 5;

[0044] (5) After the separation membrane liquid completely flows out from the lower end of the membrane assembly 18, the partition device 14 is removed, and the above steps (3) and (4) are repeated to complete the first coating of the membrane filaments; after the separation membrane liquid completely flows out from the lower end of the membrane assembly 18, the vacuum pump 12 continues to evacuate for 5-10 minutes to extract the large droplets or liquid columns inside the membrane filaments and collect them in the CO2 separation membrane liquid collection container 10;

[0045] (6) Turn on the CO2 separation membrane liquid pump 11 to send the separation membrane liquid in the CO2 separation membrane liquid collection container 10 along the reflux pipeline into the membrane liquid storage tank for reuse.

[0046] Step 2: Drying of hollow fiber CO2 separation membrane components: Use Figure 2 The hollow fiber CO2 separation membrane assembly drying device is used for the drying process. The structure of the hollow fiber CO2 separation membrane assembly drying device includes: a hot air blower 15 and a gas distribution chamber 17. A hot air duct is installed between the hot air blower 15 and the gas distribution chamber 17, and a rotary joint is installed on the hot air duct. A gas distributor 20 is arranged in the gas distribution chamber 17. The other end of the gas distribution chamber 17 is used to connect the membrane assembly 18 to be dried. The gas distribution chamber 17 and the membrane assembly 18 are supported by a controllable pulley frame 19. A quick connector chuck clamp 6 is arranged between the membrane assembly 18 and the gas distribution chamber 17 to realize the quick connection of the membrane assembly 18. When drying the membrane assembly 18, the specific steps are as follows:

[0047] (I) Selecting a suitable hot air blower 15 according to the number and size of the membrane modules 18 to be dried, and connecting the hot air blower 15 and the gas distribution chamber 17 by means of a rotary joint and a hot air duct;

[0048] (II) Place the membrane assembly 18 coated with separation membrane liquid on the controllable pulley frame 19, ensure that the separation membrane liquid inflow end of the membrane assembly 18 is connected to the gas distributor 20 chamber, and use the quick connector clamp 6 to fix the membrane assembly 18 and the gas distribution chamber 17. Open the two sets of controllable pulley frames 19 to rotate the separation membrane assembly 18 and the gas distribution chamber 17, and keep it at 10-20 rpm;

[0049] (III) Turn on the hot air blower 15, adjust the temperature of the hot air blower 15 to 50-80°C, adjust the hot air volume according to the size of the module, control the air volume at 1-5L / min, and blow the hot air for 2-4h according to the size of the membrane module 18.

[0050] Step 3, cyclic casting of hollow fiber CO2 separation membrane assembly: After the assembly purge time is completed, cool it to room temperature, place the other end of the assembly under the coating chamber 5, and repeat the coating and drying process. This is one cyclic casting of the membrane assembly 18. Depending on the permeability and selectivity of the assembly, 2-6 cyclic castings can be performed.

[0051] Step 4. Continuous production of hollow fiber CO2 separation membrane components: Since the drying time of the hollow fiber CO2 separation membrane group is relatively long, and the coating time of the membrane component 18 is relatively short, a larger hot air blower 15 can be selected for continuous production, and multiple branch pipes and valves can be set up to connect multiple drying devices to ensure that the components that are continuously coated within the drying time of a single component can be dried at the same time.

[0052] Step 5: The above process is a complete coating process. According to the thickness requirement of the separation layer of the membrane component, the above process can be repeated to increase the thickness of the separation layer of the membrane component.

[0053] Experimental example: membrane module performance test

[0054] 1. Membrane uniformity test: The membrane assembly prepared in Example 1 was subjected to electron microscope scanning (SEM) to observe the coating uniformity; at the same time, the membrane assembly coated by the conventional coating method of the prior art (described in the background technology) was used as a comparison and electron microscope scanning was performed. The results are as follows: Figure 4 , Figure 5 shown. Figure 4 This is a scanning electron microscope image of the successful coating of Example 1 of the present invention; Figure 5 The comparative example is a scanning electron microscope image of successful coating.

[0055] 2. Component performance test

[0056] Test method: Figure 3As shown, this embodiment has built a single-stage membrane module performance test device, and the specific test process is that the flue gas after pretreatment (dust removal, desulfurization) is introduced into the compressor, and after being compressed by the compressor, it enters the membrane module from the upper end of the membrane module, and the captured high-concentration CO2 permeate gas flows out from the permeation side of the membrane module, and the remaining gas after being captured by the membrane module flows out from the retention side of the membrane module; a regulating valve is set on the retention side of the membrane module to control the pressure in the membrane module to be 0.1-0.3MPa; pressure, flow, temperature, humidity and other instruments are set in the pipelines before and after the membrane module and on the permeation side, and the relevant parameters of the inlet, permeation side and retention side gases are measured by relevant instruments, and the CO2 and O2 concentrations of the inlet, permeation side and retention side gases are measured using a handheld flue gas analyzer, and the CO2 permeability and CO2 / N2 selectivity of the membrane module are calculated by the following formula.

[0057] The permeability Pi of the i-th permeating gas is calculated by the following formula, and the permeability unit is GPU:

[0058]

[0059] Where N perm ——Gas flow rate on the permeate side (L / min);

[0060] yi——molar fraction of gas i in the permeate side gas (%)

[0061] y H2O ——The mole fraction of water vapor in the permeate side gas;

[0062] P i,ret ——partial pressure of gas i in the residual gas (bar);

[0063] P i,perm ——partial pressure of gas i on the permeate side (bar);

[0064] A——Effective membrane area (cm 2 ).

[0065] Separation factor α ij Calculated by the following formula:

[0066]

[0067] Wherein, yi and yj are the molar ratios of gas i and gas j in the permeate gas, and xi and xj are the molar ratios of gas i and gas j in the residual gas, respectively.

[0068] Test results: The CO2 permeability of the successfully manufactured module is ≥1500GPU, CO2 / N2 selectivity is ≥30, and the CO2 concentration of the permeated gas is ≥50% when the inlet CO2 concentration is 8.5%. If the module is not successful, there is almost no CO2 / N2 selectivity, and the CO2 concentration of the permeated gas is basically the same as the inlet when the inlet CO2 concentration is 8.5%. If the membrane is too thick, the CO2 permeability is very small, and CO2 may not be detected on the permeation side.

[0069] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for preparing a hollow fiber carbon dioxide separation membrane module, characterized in that: It includes a coating stage and a drying stage; during the coating stage, a partitioning device is placed at the center of the component to be coated to block the central membrane thread hole of the membrane component. After the separation membrane liquid completely flows out from the lower end of the membrane component, the partitioning device is taken out and the separation membrane liquid is poured into the membrane component from the upper end again to complete one coating of the component.

2. The method for preparing a hollow fiber carbon dioxide separation membrane module according to claim 1, characterized in that: During the drying stage, hot air is used to dry the rotating membrane assembly, the drying temperature is 50-80°C, the hot air volume is 1-5L / min, and the drying time is 2-4h.

3. The method for preparing a hollow fiber carbon dioxide separation membrane assembly according to claim 2, characterized in that: The diameter of the partition device is 2 / 3 of the diameter of the membrane module.

4. The method for preparing a hollow fiber carbon dioxide separation membrane module according to claim 3, characterized in that: During the coating stage, the vertical distance between the CO2 separation membrane liquid storage tank and the membrane assembly to be coated is 1.5-3m.

5. The method for preparing a hollow fiber carbon dioxide separation membrane module according to claim 4, characterized in that: The bottom end of the CO2 separation membrane liquid storage tank is connected to a metering pipeline coaxially arranged therewith, the metering pipeline is transparently arranged, and scale lines are arranged on the metering pipeline.

6. The method for preparing a hollow fiber carbon dioxide separation membrane module according to claim 5, characterized in that: A ball valve is arranged between the CO2 separation membrane liquid storage tank and the metering pipeline, and a butterfly valve is arranged at the bottom of the metering pipeline.

7. The method for preparing a hollow fiber carbon dioxide separation membrane module according to claim 6, characterized in that: A coating chamber is arranged between the CO2 separation membrane liquid storage tank and the membrane assembly to be coated. The coating chamber is coaxially arranged with the metering pipeline, and the partitioning device is arranged in the coating chamber.

8. The method for preparing a hollow fiber carbon dioxide separation membrane module according to claim 7, characterized in that: The diameter of the coating chamber is the same as that of the membrane assembly, both of which are 0.09-0.3m. A vacuum pump is provided under the membrane assembly.

9. The method for preparing a hollow fiber carbon dioxide separation membrane module according to claim 8, characterized in that: During the drying stage, the coated membrane assembly is connected to the gas distribution chamber, the other end of the gas distribution chamber is connected to a hot air blower, and a gas distributor is arranged in the gas distribution chamber.

10. The method for preparing a hollow fiber carbon dioxide separation membrane module according to claim 9, characterized in that: The coated membrane assembly and the outside of the gas distribution chamber are both connected with a controllable pulley frame for support, so as to control the uniform rotation and rotation speed of the membrane assembly on the pulley frame.

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