Separation membrane system and heating and cooling method of separation membrane

Abstract

Provided is a separation membrane system provided with a separation membrane, which is capable of quickly and accurately adjusting the temperature of the separation membrane. A separation membrane system according to an embodiment of the present invention is provided with: a separation membrane; a heating device; the temperature measurer is arranged between the separation membrane and the heating device; and a supply line that mixes a first gas and a second gas, which is a gas for temperature adjustment, at a position upstream of the installation position of the temperature measurement device, and supplies the mixed gas of the first gas and the second gas to the separation membrane, the temperature measuring device measures the temperature of the mixed gas supplied to the separation membrane, and adjusts the flow rate of the second gas on the basis of the temperature measured by the temperature measuring device, thereby controlling the temperature of the mixed gas.

Description

Technical Field

[0001] The present invention relates to a separation membrane system and a method for heating and cooling the separation membrane. Background Art

[0002] Various methods have been explored for the purpose of separating a desired component from a fluid containing two or more components. One such method, for example, is the use of a separation membrane that selectively allows a specific component to permeate. In separation methods utilizing such a separation membrane, the temperature of the membrane is sometimes adjusted to ensure that the membrane performs its intended function. In this case, if the temperature of the membrane changes dramatically, the membrane may be damaged.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-94726 Summary of the Invention

[0006] A main object of the present invention is to provide a separation membrane system including a separation membrane, which can rapidly and accurately adjust the temperature of the separation membrane.

[0007] [1] The separation membrane system involved in an embodiment of the present invention comprises: a separation membrane; a heating device; a temperature measuring device, which is arranged between the separation membrane and the heating device; and a supply line, which mixes a first gas and a second gas serving as a temperature adjustment gas at a position upstream of the setting position of the temperature measuring device, and supplies the mixed gas of the first gas and the second gas to the separation membrane, the temperature measuring device measures the temperature of the mixed gas supplied to the separation membrane, and controls the temperature of the mixed gas by adjusting the flow rate of the second gas based on the temperature measured by the temperature measuring device.

[0008] [2] In the separation membrane system of [1] above, the mixing of the first gas and the second gas may be performed upstream of the heating device.

[0009] [3] The method for increasing and decreasing the temperature of a separation membrane according to an embodiment of the present invention includes the steps of: mixing a first gas and a second gas as a temperature adjustment gas to obtain a mixed gas; and supplying the mixed gas to the separation membrane.

[0010] [4] The method for heating and cooling the separation membrane of [3] may include controlling the heating and cooling rate of the separation membrane by adjusting the mixing ratio of the first gas and the second gas.

[0011] [5] In the separation membrane temperature raising and lowering method of [3] or [4], the second gas may include gas that has permeated the separation membrane.

[0012] [6] In the separation membrane temperature increase / decrease method according to any one of [3] to [5], the mixed gas may contain gas that has permeated the separation membrane.

[0013] Effects of the Invention

[0014] According to an embodiment of the present invention, it is possible to provide a separation membrane system for a separation membrane capable of rapidly and accurately regulating the temperature of the separation membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an explanatory diagram showing the outline of a separation membrane system according to one embodiment of the present invention.

[0016] Figure 2 This is an explanatory diagram showing the outline of a separation membrane system according to one embodiment of the present invention.

[0017] Figure 3 This is an explanatory diagram schematically showing the configuration of a separation membrane complex in one embodiment of the present invention.

[0018] Figure 4 This is a schematic cross-sectional view showing the structure of a separation membrane complex in one embodiment of the present invention. DETAILED DESCRIPTION

[0019] A.Separation membrane system

[0020] Figure 1 This is an explanatory diagram showing an overview of a separation membrane system according to one embodiment of the present invention. The separation membrane system 100 includes: a separation membrane 1; a heating device 20; a temperature measuring device 30 disposed between the separation membrane 1 and the heating device 20; and a supply line that mixes a first gas and a second gas serving as a temperature adjustment gas at a position upstream of the temperature measuring device 30 and supplies the mixed gas of the first and second gases to the separation membrane. The temperature measuring device 30 measures the temperature of the mixed gas supplied to the separation membrane. In one embodiment, the separation membrane 1 may constitute a separation membrane complex 10. The separation membrane 1 can separate a mixed fluid supplied to the separation membrane 1 based on its permeability. Figure 1 Schematically shows an embodiment in which the mixed gas is supplied to the cylindrical separation membrane 1 to adjust the temperature (increase or decrease the temperature) of the separation membrane complex 10 (substantially, the separation membrane 1 ).

[0021] The separation membrane system may include any appropriate gas flow adjustment mechanism a capable of adjusting the flow rate of a second gas (temperature adjustment gas). The flow rate of the second gas (temperature adjustment gas) is adjusted based on the temperature measured by a temperature measuring device. By adjusting the flow rate of the second gas (temperature adjustment gas) (i.e., by passing the second gas with an adjusted flow rate), the temperature of the mixed gas is controlled. In this specification, the flow rate of the second gas (temperature adjustment gas) refers to the flow rate of the second gas before mixing (preferably immediately before mixing).

[0022] In one embodiment, the second gas (temperature-adjusting gas) can be mixed with a first gas having a higher temperature than the second gas. In this embodiment, the temperature of the first gas immediately before mixing is, for example, 400°C or less. Preferably, it is 80°C to 200°C. In this manner, steam heating can be used as the heating device. More preferably, it is 80°C to 150°C. In this manner, lower-cost low-pressure steam heating can be used as the heating device. The first gas immediately before mixing can be a gas (heating gas) heated by the heating device. That is, the first and second gases can be mixed downstream of the heating device. This allows for more precise control of the temperature of the mixed gas. In this embodiment, the upper limit of the temperature of the second gas (temperature-adjusting gas) is not particularly limited and is, for example, 80°C. Within this range, a low-cost flow control mechanism, such as a flow control valve using a rubber sheet, can be employed. The lower limit is not particularly limited and is preferably above 0°C. Within this range, damage to the piping due to freezing can be prevented. In the present embodiment, the temperature of the mixed gas obtained by mixing the second gas (temperature adjustment gas) into the first gas is, for example, 60°C to 300°C. By setting it to such a range, the separation membrane can easily exert separation performance. The mixed gas of the first gas and the second gas (temperature adjustment gas) is preferably supplied to the separation membrane directly (that is, without passing through a temperature regulating device, etc.). In one embodiment, the temperature of the mixed gas is preferably above 90°C. If it is within such a range, the thermal energy possessed by the first gas can be effectively used.

[0023] The mixing of the first gas and the second gas (temperature-adjusting gas) can be performed upstream of the aforementioned heating device. This allows the gases to be mixed while minimizing the temperature difference between the mixed first and second gases, resulting in a uniform temperature after mixing. In this embodiment, the upper limit of the temperature of the first gas immediately before mixing is not particularly limited, and is, for example, less than 80°C. This range allows for the use of low-cost accessories such as valves using rubber sheets. The lower limit of the temperature of the first gas is not particularly limited, and is, for example, preferably above 0°C. This range prevents damage to the piping caused by freezing. In this embodiment, the upper limit of the temperature of the second gas (temperature-adjusting gas) is, for example, less than 80°C. This range allows for the use of low-cost accessories such as valves using rubber sheets. The lower limit of the temperature of the second gas is not particularly limited, and is, for example, preferably above 0°C. This range prevents damage to the piping caused by freezing. In this embodiment, the upper limit of the temperature of the mixed gas obtained by mixing the second gas (temperature-adjusting gas) with the first gas is, for example, less than 80°C. If the temperature is within this range, low-cost auxiliary equipment such as valves using rubber sheets can be used. The lower limit of the mixed gas temperature is not particularly limited, but is preferably 0°C or higher, for example. If the temperature is within this range, damage caused by freezing of the piping can be prevented.

[0024] In an embodiment of the present invention, by supplying a mixed gas obtained by mixing a first gas and a second gas (temperature adjustment gas) to a separation membrane, a separation membrane system can be provided that can quickly and accurately adjust the temperature of the separation membrane. In more detail, the heating of the gas by the heating device has the following characteristics: the temperature change of the gas for output adjustment or switching on / off of the heating device is slow, or frequent output adjustment and switching on / off become difficult. However, in an embodiment of the present invention, by combining the heating of the heating device with the mixing of the second gas (temperature adjustment gas), the temperature of the gas supplied to the separation membrane can be controlled, thereby enabling the temperature adjustment of the separation membrane to be quickly and accurately performed. In addition, the increase or decrease in the output of the heating device can be suppressed, thereby performing the temperature adjustment of the separation membrane as described above. According to the above-mentioned separation membrane system that can exhibit the above-mentioned effects, the speed of temperature change can be easily and accurately controlled, and therefore, it is particularly useful when it is necessary to gradually change the temperature of the separation membrane. For example, it is particularly useful when heating and / or cooling a separation membrane that may be damaged by a sudden temperature change.

[0025] In one embodiment, the first gas and the second gas (temperature adjustment gas) contain polar gases. Polar gases have high affinity and adsorption properties for separation membranes. Therefore, using a gas containing a polar gas as the gas allows for efficient temperature adjustment of the separation membrane. In this specification, a polar gas refers to a gas containing heteronuclear molecules. Examples of polar gases include CO2 and H2O.

[0026] In one embodiment, the separation membrane complex can be cylindrical. If the process target fluid is introduced into the inner side of the cylindrical structure of the separation membrane complex at a predetermined introduction pressure (e.g., 0.5 MPa or more), the fluid that has passed through the separation membrane complex (substantially the separation membrane) can be discharged from the surface of the separation membrane complex, while the fluid that has not passed through can be passed along the length direction of the cylindrical separation membrane complex. As a result, the process target fluid can be separated. The separation membrane complex can be composed of a single cylindrical structure or a plurality of cylindrical structures. Preferably, the separation membrane complex comprises: a plurality of cylindrical compartments that extend through the longitudinal direction.

[0027] Figure 3 This is an explanatory diagram schematically showing the configuration of a separation membrane complex in one embodiment of the present invention. Figure 4 1 is a schematic cross-sectional view showing the structure of a separation membrane complex in one embodiment of the present invention. A plurality of compartments 11 are formed in the separation membrane complex 10. The compartment 11 is formed in a cylindrical shape so as to penetrate the separation membrane complex 10 along the longitudinal direction. The compartment 11 can be a flow path for the fluid to be processed. The separation membrane complex 10 includes a separation membrane 1, and the separation membrane 1 is provided on a porous substrate 2. In one embodiment, the separation membrane 1 can be provided so as to cover substantially the entire surface of the inner side surface (i.e., the side surface of the compartment) of the porous substrate 2. Among the fluid to be processed passing through the compartment 11, the fluid with a higher permeability to the separation membrane 1 (permeated fluid) passes through the separation membrane complex 10 and is sent out from the side surface 13 of the separation membrane complex 10. On the other hand, the fluid with a lower permeability to the separation membrane 1 (non-permeated fluid) passes through the flow path of the compartment 11 and is sent out. Although not shown, the separation membrane complex described above can be housed in any suitable outer cylinder for use, thereby forming a flow path for the non-permeable fluid within the outer cylinder. Furthermore, the separation membrane complex is not limited to the above-described configuration; for example, the separation membrane can be formed on the outer surface of a tubular porous substrate. In such a separation membrane complex, the outer surface of the tubular porous substrate can serve as the flow path for the fluid being processed, with the permeable fluid passing through the side of the separation membrane complex to the inner surface of the porous substrate and being discharged, while the non-permeable fluid passes through the outer surface of the porous substrate and is discharged.

[0028] In one embodiment, the separation membrane is heated using a mixed gas obtained by mixing a second gas (temperature adjustment gas) with a first gas. To achieve the separation function described above, the separation membrane complex (substantially, the separation membrane) is preferably heated before supplying the process fluid. The heating rate can be controlled by the mixing ratio of the first gas and the second gas (temperature adjustment gas) and the temperatures of the first and second gases (temperature adjustment gases).

[0029] Furthermore, the separation membrane can be cooled by mixing a second gas (temperature-regulating gas) with the first gas to create a mixed gas. The cooling rate can be controlled by the mixing ratio of the first gas to the second gas (temperature-regulating gas) and the temperatures of the first and second gases (temperature-regulating gases).

[0030] The separation membrane system may include multiple separation membrane complexes. These multiple separation membrane complexes may be connected in series, in parallel, or in a combination of series and parallel arrangements. When the separation membrane complexes are connected in parallel, the parallel separation membrane complexes may or may not operate simultaneously.

[0031] (Separation membrane)

[0032] In one embodiment, the separation membrane can separate a mixed fluid based on differences in permeability relative to the separation membrane having micropores. For example, the target fluid can be separated by a so-called molecular sieving effect, where the permeability is controlled based on the size of the molecules constituting the fluid and the pore size of the separation membrane.

[0033] Preferably, the separation membrane is an inorganic membrane. Examples of materials constituting the separation membrane include zeolite, silica, and carbon.

[0034] In one embodiment, a zeolite membrane is used as the separation membrane. A zeolite membrane is a membrane-like structure of zeolite formed on the surface of a porous substrate. The zeolite membrane may contain two or more zeolites having different structures or compositions.

[0035] The zeolite constituting the zeolite membrane may include zeolites in which the atoms (T atoms) located at the center of the oxygen tetrahedron (TO4) constituting the zeolite are solely Si, zeolites in which the T atoms include Si and Al, AlPO-type zeolites in which the T atoms include Al and P, SAPO-type zeolites in which the T atoms include Si, Al, and P, MAPSO-type zeolites in which the T atoms include magnesium (Mg), Si, Al, and P, or ZnAPSO-type zeolites in which the T atoms include zinc (Zn), Si, Al, and P. Some of the T atoms may be substituted with other elements.

[0036] Examples of the zeolite include AEI, AEN, AFN, AFV, AFX, BEA, CHA, DDR, ERI, ETL, FAU (X, Y), GIS, LEV, LTA, MEL, MFI, MOR, PAU, RHO, SAT, and SOD zeolites. The maximum number of ring members in the zeolite is preferably 12 or less, more preferably 10 or less, and even more preferably 8 or less. Furthermore, it is preferably 6 or more, and more preferably 8 or more.

[0037] The above-mentioned zeolite membrane contains, for example, Si. The zeolite membrane may contain, for example, any two or more of Si, Al and P. The zeolite membrane may contain an alkali metal. The alkali metal is, for example, sodium (Na) or potassium (K). When the zeolite membrane contains Si atoms and Al atoms, the Si / Al ratio in the zeolite membrane is, for example, greater than 1 and less than 100,000. The Si / Al ratio is: the molar ratio of the Si element contained in the zeolite membrane to the Al element. The Si / Al ratio is preferably greater than 5, more preferably greater than 20, and further preferably greater than 100, the higher the better. The Si / Al ratio in the zeolite membrane can be adjusted by adjusting the mixing ratio of the Si source and the Al source in the raw material solution described later.

[0038] The average pore diameter of the above-mentioned separation membrane is, for example, 0.2 nm to 1 nm, more preferably 0.3 nm to 0.5 nm. The pore diameter of the separation membrane can be adjusted according to the composition of the desired permeating fluid. If the average pore diameter of the separation membrane is made smaller, the selectivity is increased. The average pore diameter of the separation membrane is smaller than the average pore diameter of the porous substrate. In the case where the separation membrane is a zeolite membrane, the maximum number of ring members of the zeolite is set to n, and the arithmetic average of the short diameter and the long diameter of the n-membered ring pore is set to the average pore diameter. The n-membered ring pore refers to a pore in which the number of oxygen atoms in the part where the oxygen atoms are bonded to the T atoms to form a ring structure is n. In the case of a plurality of n-membered ring pores having n equal numbers, the arithmetic average of the short diameter and the long diameter of all the n-membered ring pores is set to the average pore diameter of the zeolite. The average pore diameter of a zeolite membrane is determined by the framework structure of the zeolite and can be determined from the values ​​disclosed in the "Database of Zeolite Structures" [online] of the International Zeolite Society or on the Internet (URL: http: / / www.iza-structure.org / databases / ).

[0039] The thickness of the separation membrane is, for example, 0.05 μm to 30 μm, preferably 0.1 μm to 20 μm, and more preferably 0.5 μm to 10 μm. A thicker separation membrane increases selectivity, while a thinner separation membrane increases permeation rate.

[0040] The surface roughness (Ra) of the separation membrane is, for example, 5 μm or less, preferably 2 μm or less, more preferably 1 μm or less, and further preferably 0.5 μm or less. In this specification, the surface roughness (Ra) is the arithmetic surface roughness Ra measured in accordance with JIS B 0601.

[0041] The separation membrane can be formed by any appropriate method according to the material constituting the membrane. For example, a zeolite membrane is obtained as follows: zeolite as a seed is coated on a porous substrate, and the porous substrate with the seed attached is immersed in a raw material solution, and hydrothermal synthesis is used to grow the zeolite with the seed as the nucleus, thereby obtaining a zeolite membrane. The raw material solution contains, for example, a silicon source, an aluminum source, an organic matter, an alkali source, water, etc. The heating temperature in the hydrothermal synthesis is, for example, 60°C to 200°C. The heating time is, for example, 1 hour to 240 hours. In addition, a raw material slurry obtained by mixing an organic binder, a ceramic raw material and a solvent can be used to form a separation membrane.

[0042] (Porous substrate)

[0043] The porous substrate is configured to allow gas to pass through. Figure 4 In the example shown, the porous substrate 2 is a so-called monolithic substrate in which a plurality of through holes extending in the longitudinal direction are provided in an integrally formed and connected columnar main body. Figure 4 In the example shown, the porous substrate 2 is roughly cylindrical. The cross section of the through hole perpendicular to the longitudinal direction is, for example, roughly circular. A separation membrane is formed on the inner side of the through hole to obtain a separation membrane complex (porous substrate / separation membrane) having a compartment. In addition, the shape of the porous substrate is not limited to the above examples, and can be, for example, honeycomb, flat, tubular, cylindrical, cylindrical or multi-prism shaped. In one embodiment, a separation membrane can be formed on the outer side of a tubular porous substrate.

[0044] The length of the porous substrate is, for example, 10 cm to 200 cm. The outer diameter of the porous substrate is, for example, 0.5 cm to 30 cm. When the porous substrate has through-holes, the distance between the central axes of adjacent through-holes is, for example, 0.3 mm to 10 mm. When the porous substrate is tubular or cylindrical, the thickness of the porous substrate is, for example, 0.1 mm to 10 mm.

[0045] Any appropriate material can be used as the material for the porous substrate. In one embodiment, the porous substrate is formed of a ceramic sintered body. Examples of ceramic sintered bodies selected as the material for the porous substrate include alumina, silica, mullite, zirconia, titania, yttrium trioxide, silicon nitride, and silicon carbide.

[0046] The porous substrate may contain an inorganic binder. As the inorganic binder, at least one of titanium dioxide, mullite, sinterable alumina, silicon dioxide, glass frit, clay mineral, and sinterable cordierite may be used.

[0047] The porous substrate may be a single layer or a multilayer structure. Figure 4 As shown, the porous substrate has a multilayer structure consisting of layers having different pore diameters. Preferably, the pore diameter decreases toward the inner side (ie, the separation membrane side).

[0048] The average pore diameter of the porous substrate is, for example, 0.01 μm to 70 μm, preferably 0.05 μm to 25 μm. The average pore diameter of the porous substrate on the separation membrane side is 0.01 μm to 1 μm, preferably 0.05 μm to 0.5 μm. Regarding the overall pore diameter distribution of the porous substrate, including the surface and interior, D5 is, for example, 0.01 μm to 50 μm, D50 is, for example, 0.05 μm to 70 μm, and D95 ​​is, for example, 0.1 μm to 2000 μm. The porosity of the porous substrate on the separation membrane side is, for example, 25% to 50%. The average pore diameter of the porous substrate can be measured using a mercury porosimeter, a pore size distribution meter, a nanometer-sized pore size distribution meter, or the like.

[0049] The separation membrane complex composed of the separation membrane and the porous substrate has a length of, for example, 10 cm to 200 cm. The outer diameter of the separation membrane complex is, for example, 0.5 cm to 30 cm. The distance between the central axes of adjacent cells is, for example, 0.3 mm to 10 mm. The inner diameter of the cells is, for example, 1 mm to 10 mm.

[0050] (Heating device)

[0051] Any appropriate heating device may be used as the heating device, and examples of the heating device include a steam double pipe, a steam pipeline, a steam jacket, and a heat medium double pipe.

[0052] The separation membrane system may further include any appropriate elements. For example, it may include a supply unit for supplying fluid, a recovery unit for recovering fluid after passing through the separation membrane complex, and a pressure regulator for adjusting the pressure of the fluid flow path. The structure of the separation membrane system is described, for example, in International Publication No. 2018 / 225325. The contents of this publication are incorporated herein by reference.

[0053] The separation membrane system may also include a cooling device for generating the second gas (temperature adjustment gas). Any suitable cooling device may be used. Examples of the cooling device include jacketed cooling devices and multi-tube cooling devices.

[0054] (Temperature measuring device)

[0055] As the temperature measuring device, any appropriate temperature measuring device may be used as long as the effects of the present invention are achieved.

[0056] B. Temperature increase and decrease method of separation membrane

[0057] A method for increasing or decreasing the temperature of a separation membrane according to one embodiment of the present invention includes the steps of mixing a second gas (temperature-adjusting gas) with a first gas to obtain a mixed gas, and supplying the mixed gas to the separation membrane. In this embodiment, the separation membrane can be heated or cooled by mixing the second gas (temperature-adjusting gas) with the first gas and supplying the temperature-adjusted mixed gas to the separation membrane.

[0058] The separation membrane may have the configuration described in Section A. In one embodiment, as described above, the separation membrane may constitute a separation membrane complex.

[0059] In one embodiment, the temperature rise and fall rates of the separation membrane can be controlled by adjusting the mixing ratio of the first gas and the second gas (temperature adjustment gas). The mixing ratio of the first gas and the second gas (temperature adjustment gas) can be set to any appropriate ratio depending on the temperature of each gas. The mixing ratio (molar flow ratio (second gas / first gas)) of the second gas (temperature adjustment gas) to the first gas is, for example, greater than 0 and less than 10.

[0060] As described above, the first gas at the time of mixing with the second gas (temperature adjusting gas) may be a gas heated by any appropriate heating device, or may be a gas before being heated by a heating device.

[0061] The second gas (temperature-adjusting gas) may be obtained by any appropriate method. In one embodiment, the second gas (temperature-adjusting gas) may be a gas at room temperature. Alternatively, the second gas (temperature-adjusting gas) may be a gas cooled by any appropriate cooling device.

[0062] In one embodiment, the second gas (temperature adjustment gas) includes: a gas that has permeated through the separation membrane ( Figure 2 (a) in the above). In this way, the tail gas can be effectively utilized. In addition, the second gas (temperature adjustment gas) may include the non-permeated gas sent out from the separation membrane.

[0063] In one embodiment, the mixed gas obtained by mixing the second gas (temperature adjustment gas) with the first gas contains the gas ( Figure 2 (b) in the above). In this way, the tail gas can be effectively utilized. In addition, the mixed gas obtained by mixing the second gas (temperature adjustment gas) with the first gas may include the non-permeated gas sent out from the separation membrane.

[0064] In one embodiment, the temperature of the mixed gas can be adjusted by heat exchange with the gas that has permeated the separation membrane and / or the non-permeated gas discharged from the separation membrane. This reduces the load on the heating device, allowing for more rapid and accurate temperature adjustment of the separation membrane.

[0065] The mixing location of the second gas (temperature adjustment gas) is not particularly limited as long as it is upstream of the temperature measuring device, but is preferably close to the temperature measuring device. This allows for more rapid and accurate temperature adjustment of the separation membrane.

[0066] Industrial applicability

[0067] The separation membrane system of the present invention can be preferably used in a process of separating components in a mixed gas.

[0068] Explanation of symbols

[0069] 1 Separation membrane

[0070] 2. Porous substrate

[0071] 10 Separation membrane complex

Claims

1. A separation membrane system, wherein: The separation membrane system has: separation membrane; Heating device; a temperature measuring device disposed between the separation membrane and the heating device; and a supply line that mixes a first gas and a second gas serving as a temperature adjustment gas at a position upstream of a position where the temperature measuring device is installed, and supplies the mixed gas of the first gas and the second gas to the separation membrane; The temperature measuring device measures the temperature of the mixed gas supplied to the separation membrane. The flow rate of the second gas is adjusted based on the temperature measured by the temperature measuring device, thereby controlling the temperature of the mixed gas.

2. The separation membrane system according to claim 1, wherein The mixing of the first gas and the second gas is performed upstream of the heating device.

3. A method for heating and cooling a separation membrane, wherein: The separation membrane temperature raising and lowering method comprises the following steps: mixing the first gas and a second gas serving as a temperature adjustment gas to obtain a mixed gas; and This mixed gas is supplied to the separation membrane.

4. The method for increasing or decreasing the temperature of a separation membrane according to claim 3, wherein: The method for raising and lowering the temperature of the separation membrane comprises: The temperature rise and fall rates of the separation membrane are controlled by adjusting the mixing ratio of the first gas and the second gas.

5. The method for increasing or decreasing the temperature of a separation membrane according to claim 3 or 4, wherein: The second gas includes gas that has permeated through the separation membrane.

6. The method for increasing or decreasing the temperature of a separation membrane according to claim 3 or 4, wherein: The mixed gas includes gas that has permeated through the separation membrane.

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