Adsorption sheets, corrugated sheets, corrugated laminates, adsorption elements, and dehumidifiers

Abstract

The purpose of the present disclosure is to provide an absorbing sheet, a sheet processed by steps, a laminate processed by steps, an absorbing element, and a dehumidifier. Provided are an absorbing sheet, a sheet processed by steps, a laminate processed by steps, an absorbing element, and a dehumidifier.

Description

[Technical Field]

[0001] This disclosure relates to adsorption sheets, corrugated sheets, corrugated laminates, adsorption elements, and dehumidifiers. [Background technology]

[0002] Patent Document 1 discloses an adsorption element (honeycomb-shaped) containing 60 to 85% by weight of a zeolite adsorbent with a pore size of 7 Å or more, and containing the following binders A and B, and a dehumidifier or exhaust gas treatment device using the adsorption element. A: At least one polymer selected from polyvinyl alcohol-based polymers, polyacrylonitrile-based polymers, polyethylene-based polymers, and polyester-based polymers. B: Heat-resistant material.

[0003] Patent Document 2 discloses an adsorption element (honeycomb-shaped) containing an adsorbent, wherein a modified vinyl acetate adhesive is used, and the content ratio of the adhesive to the element is 1 to 15 wt%, and a dehumidifier or exhaust gas treatment device using the adsorption element.

[0004] Patent Document 3 discloses a dehumidifying member comprising a honeycomb structure, wherein the honeycomb structure includes a flat substrate and a corrugated substrate, a contact portion in which the wave crests of the corrugated substrate and the flat substrate abut, and a ventilation hole portion, wherein the contact portion includes an adhesive portion bonded with an adhesive and silica gel formed on the side of the adhesive portion toward the ventilation hole portion, and the components constituting the adhesive are different from the components of the silica gel formed on the side of the adhesive portion toward the ventilation hole portion, and a dehumidifying rotor including the dehumidifying member. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Publication number JP 2004-268020 [Patent Document 2] Publication number JP 2005-177673

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present disclosure newly aims to provide an adsorption sheet, a stepped processing sheet, a stepped processing laminate, an adsorption element, and a dehumidifier.

Means for Solving the Problems

[0007] In a lithium battery manufacturing plant, if dehumidification is not performed, problems will occur in the quality of the lithium battery. Since lithium reacts strongly with moisture, the lithium manufacturing plant needs to set the dew point to a low dew point. In some cases, a chemical manufacturing plant requires a low dew point, and such manufacturing processes are carried out in a dry room.

[0008] To create a dry room environment, an adsorption type dehumidification means using an adsorption element such as zeolite or silica gel is used. Such a rotor desorbs the adsorbed moisture by high-temperature regeneration treatment at 140°C or higher and continuously produces dehumidified air. Therefore, a large amount of energy is required for operation.

[0009] With the background of global warming, energy conservation is required, that is, an improvement in dehumidification performance due to energy conservation is necessary.

[0010] Conventionally, the element adopts a method of directly immersing a liquid of silica sol in a honeycomb structure or a sheet to synthesize silica gel (Patent Document 3). In this technology, silica gel exists at a high density, the porosity is low, the diffusibility of the gas to be treated in the adsorption element is poor, and an improvement in dehumidification performance could not be expected.

[0011] The present disclosure includes the following adsorption sheet, stepped processing sheet, stepped processing laminate, adsorption element, and dehumidifier.

[0012] Item 1. It is an adhesive sheet, The porous material contains silica gel and / or a porous metal complex. Let A cc / g be the pore volume determined by the mercury intrusion method. When the pore volume at a relative pressure p / p0 = 0.4, determined by the N2 adsorption isotherm, is defined as B cc / g, The value of B / A (B divided by A) is less than or equal to 0.25. Adhesive sheet.

[0013] Section 2. It is an adhesive sheet, The porous material contains silica gel and / or a porous metal complex. The pore volume for pores with a diameter in the range of 3 nm to 500 μm is defined as C cc / g. When the pore volume at a relative pressure p / p0 = 0.4 in the range of pore diameter less than 3 nm is defined as D cc / g, The value of D / C (D divided by C) is less than or equal to 0.25. Adhesive sheet.

[0014] Section 3. The adsorption sheet according to item 1 or 2, containing 40% to 85% by mass of the silica gel and / or porous metal complex.

[0015] Section 4. It is a corrugated sheet, The adhesive sheets described in item 1 or 2 above are bonded together, The flat suction sheet and the corrugated suction sheet are bonded together, It has numerous cells that form air passages. Corrugated sheet.

[0016] Section 5. A laminated body formed by stacking the laminated sheets described in item 4 above.

[0017] Section 6. The number of cells per unit area of ​​the surface through which air passes is 80 cells / cm². 2 More than 135 pieces / cm 2 The stepped laminate described in item 5 above is as follows:

[0018] Section 7. A stepped laminate, The porous material contains silica gel and / or a porous metal complex. Let A cc / g be the pore volume determined by the mercury intrusion method. When the pore volume at a relative pressure p / p0 = 0.4, determined by the N2 adsorption isotherm, is defined as B cc / g, The adsorption sheet has a value of B / A (B divided by A) that is 0.25 or less. A stepped laminate (as described in item 5 or 6 above).

[0019] Section 8. A stepped laminate, The porous material contains silica gel and / or a porous metal complex. The pore volume for pores with a diameter in the range of 3 nm to 500 μm is defined as C cc / g. When the pore volume at a relative pressure p / p0 = 0.4 in the range of pore diameter less than 3 nm is defined as D cc / g, The value of D / C (D divided by C) is less than or equal to 0.25. A stepped laminate as described in any one of items 5 to 7 above.

[0020] Section 9. An adsorption element comprising a stepped laminate as described in any one of items 5 to 8 above.

[0021] Section 10. It is a dehumidifier, It comprises a rotating body, an air supply passage for the adsorption zone, and an air supply passage for the regeneration zone. The rotating body is a rotating body that rotates the adsorption element described in item 9 around a rotation axis, and has an adsorption zone and a regeneration zone along the circumferential direction which is the rotation direction of the rotating body. The adsorption zone air supply passage is an adsorption zone air supply passage that supplies the air to be treated to the adsorption zone and adsorbs the moisture in the air by the adsorption element. The regeneration zone air supply passage is a regeneration zone air supply passage that supplies regeneration air for desorbing moisture from the adsorption element that has adsorbed moisture to the regeneration zone. Dehumidifier.

[0022] The adsorption sheet of the present disclosure adjusts A (or C): the pore volume in mesopores to macropores (3 nm to 500 μm) (measured by mercury intrusion method), and B (or D): the pore volume in micropores (less than 3 nm) (measured by N2 adsorption method).

[0023] The adsorption sheet of the present disclosure directly results from gas adsorption and serves as the driving force for B (or D) that affects the adsorption / desorption rate and for A (or C) to approach the micropores.

[0024] It is important that the adsorption sheet of the present disclosure has B << A (or D << C), and due to B / A (or D / C) being 0.25 or less, high-efficiency gas diffusion within the adsorption sheet can be achieved.

[0025] The range of A (or C) in the adsorption sheet of the present disclosure is preferably 1.5 to 3, and more preferably 1.5 to 2.8.

[0026] The range of B (or D) in the adsorption sheet of the present disclosure is preferably 0.1 to 0.4, and more preferably 0.1 to 0.38.

[0027] By applying the adsorption sheet (step-processed sheet, step-processed laminate, and adsorption element) of the present disclosure to a dehumidifier, the gas diffusivity within the adsorption sheet can be improved, and the dehumidification performance can be improved.

Effects of the Invention

[0028] The present disclosure can newly provide an adsorption sheet, a step-processed sheet, a step-processed laminate, an adsorption element, and a dehumidifier.

Brief Description of the Drawings

[0029] [Figure 1] Figure 1 is an explanatory diagram illustrating porous metal complexes that have open metal sites (coordination unsaturated sites). [Figure 2] Figure 2 is an explanatory diagram illustrating a porous metal complex having an OH group in the metal core unit. [Figure 3] Figure 3(A) is a perspective view of a liner-type adsorption sheet. Figure 3(B) is a perspective view of a corrugated-type adsorption sheet. Figure 3(C) is a perspective view of an adsorption sheet in which a corrugated-type adsorption sheet is laminated on a liner-type adsorption sheet. [Figure 4] Figure 4(A) is a perspective view showing the procedure for forming the adsorption element. Figure 4(B) is a perspective view of the adsorption element. [Figure 5] Figure 5 is a schematic diagram of the adsorption / desorption processing device. [Modes for carrying out the invention]

[0030] Embodiments of the adsorption sheet, corrugated sheet, corrugated laminate, adsorption element, and dehumidifier of this disclosure will be described.

[0031] The embodiments described herein are intended to provide a better understanding of the spirit of the invention and, unless otherwise specified, do not limit the scope of the invention.

[0032] In this specification, "contains" and "include" are concepts that encompass all of "comprise," "consist essentially of," and "consist of." In this specification, when a numerical range is indicated as "A to B," the numerical range means "greater than or equal to A and less than or equal to B."

[0033] <Adhesive Sheet> The adhesive sheet disclosed herein is The porous material contains silica gel and / or a porous metal complex. Let A cc / g be the pore volume determined by the mercury intrusion method. When the pore volume at a relative pressure p / p0 = 0.4, determined by the N2 adsorption isotherm, is defined as B cc / g, The value of B / A, obtained by dividing B by A, is 0.25 or less.

[0034] The adhesive sheet disclosed herein is The porous material contains silica gel and / or a porous metal complex. The pore volume for pores with a diameter in the range of 3 nm to 500 μm is defined as C cc / g. When the pore volume at a relative pressure p / p0 = 0.4 in the range of pore diameter less than 3 nm is defined as D cc / g, The value of D / C, obtained by dividing D by C, is 0.25 or less.

[0035] The adsorption sheet of this disclosure contains 40% to 85% by mass of silica gel and / or a porous metal complex.

[0036] The adsorption sheet of this disclosure adsorbs some of the gases contained in the gas to be treated, such as water, carbon dioxide, organic solvents, and malodorous components.

[0037] The adsorption sheet of this disclosure comprises a porous material, and preferably further comprises a flocculant, fibers, an organic binder, etc. The porous material is a material for adsorbing the substance to be adsorbed.

[0038] Adsorption sheets are sheets containing porous materials such as silica gel and zeolite. Adsorption sheets are manufactured, for example, by a wet papermaking method in which porous materials, fibers, and organic binders are mixed and formed.

[0039] Fibers form the framework of the adsorption sheet. Organic binders are used to fix porous materials to the adsorption sheet and to improve the strength, flexibility, and other properties of the adsorption sheet.

[0040] <Porous material> The adsorption sheet of this disclosure contains silica gel and / or a porous metal complex as a porous material, for the following reasons: (1) A (or C): pore capacity at mesopores to macropores (3 nm to 500 μm) (measured by mercury intrusion method), and B (or D): pore capacity at micropores (less than 3 nm) (measured by N2 adsorption method); (2) B, which is directly caused by gas adsorption and affects the adsorption / desorption rate, and A, which act as a driving force for approaching the micropores; and (3) by applying it to a dehumidifier, the gas diffusion within the adsorption sheet can be improved, thereby improving the dehumidification performance.

[0041] The porous material contained in the adsorption sheet is not particularly limited as long as it has the ability to adsorb the substance to be adsorbed, and can be appropriately selected from known porous materials depending on the substance to be adsorbed. Preferred examples of porous materials include zeolites, silica gel, and porous metal complexes (PCPs / Metal Organic Frameworks, MOFs).

[0042] (Zeolite) Zeolites can preferably be exemplified by natural zeolites, synthetic zeolites (also called molecular sieves), and artificial zeolites. Zeolites can be selected from the above depending on the purpose, but synthetic zeolites are preferred due to their stable quality and performance.

[0043] (silica gel) Examples of silica gel include type A silica gel and type B silica gel. When the substance to be adsorbed is a polar substance such as water or carbon dioxide, type A silica gel with a small average pore size or type RD silica gel having physical properties similar to type A silica gel is preferred from the viewpoint of improving the adsorption performance to the substance to be adsorbed.

[0044] From the viewpoint of improving the desorption performance of silica gel to the adsorbed substance, Type B silica gel, which has a larger average pore size, is preferred. In order to achieve both adsorption and desorption performance, Type A or Type RD silica gel and Type B silica gel may be mixed in any ratio according to the desired performance.

[0045] (Porous metal complexes, Figures 1 and 2) Porous metal complexes are porous materials formed by the self-assembly of metal ions, which can take on various coordination forms, and organic ligands having two or more coordination sites. In porous metal complexes, a framework structure is constructed by the organic ligands cross-linking the metal ions that act as nodal points, and the pores within this framework act as spaces for adsorbing target substances.

[0046] Compared to inorganic porous materials such as silica gel and zeolites, porous metal complexes have characteristics such as a high specific surface area, a sharp pore distribution, and high structural design flexibility. Therefore, they have the advantage of a fast adsorption rate of adsorbed substances and the ability to adsorb a large amount of adsorbed substances.

[0047] Porous metal complexes have the advantage of requiring less energy for regeneration because they adsorb and desorb target substances through weak bonding forces such as coordination interactions and hydrogen bonds. This is because they generate little heat of adsorption when adsorbing target substances, and they can desorb adsorbed substances even at low temperatures of the regenerated gas.

[0048] By using porous metal complexes as porous materials, the adsorption sheet can effectively adsorb target substances in the gas being treated.

[0049] The metal ions constituting the porous metal complex are not particularly limited, and examples include titanium ions, iron ions, cobalt ions, nickel ions, copper ions, zinc ions, aluminum ions, zirconium ions, etc. Among these, titanium ions, iron ions, manganese ions, copper ions, zinc ions, aluminum ions, and zirconium ions, which have low toxicity in consideration of environmental pollution, are preferably exemplified as the above metal ions.

[0050] Examples of compounds containing organic ligands include the following:

[0051] Dicarboxylic acids such as terephthalic acid, isophthalic acid, 2-aminoterephthalic acid, 2,5-diaminoterephthalic acid, 2,5-dihydroxyterephthalic acid, 1,4-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-biphenyldicarboxylic acid, 3,3'-biphenyldicarboxylic acid, fumaric acid, 1H-pyrazole-3,5-dicarboxylic acid, and 2,5-franzicarboxylic acid.

[0052] Tricarboxylic acids such as trimesic acid.

[0053] Tetracarboxylic acids such as azobenzene-3,3'-5,5'-tetracarboxylic acid.

[0054] Imidazoles such as 2-methylimidazole.

[0055] Specific examples of porous metal complexes: A porous metal complex (MOF303) composed of aluminum ions and 1H-pyrazole-3,5-dicarboxylic acid. A porous metal complex (MIL160) composed of aluminum ions and 2,5-franzicarboxylic acid. A porous metal complex (PCN250) composed of iron ions and azobenzene-3,3'-5,5'-tetracarboxylic acid. A porous metal complex (MIL100) composed of iron ions and trimesic acid. Porous metal complexes (MIL53, MIL101) composed of iron ions and terephthalic acid. A porous metal complex (MOF801) composed of zirconium ions and fumaric acid. A porous metal complex (UiO66) composed of zirconium ions and terephthalic acid. A porous metal complex (UiO66-NH2) composed of zirconium ions and 2-aminoterephthalic acid. A porous metal complex (MIL125) composed of titanium ions and terephthalic acid. A porous metal complex (MIL125-NH2) composed of titanium ions and 2-aminoterephthalic acid. A porous metal complex (MOF74-Ni) composed of nickel and 2,5-dihydroterephthalic acid. A porous metal complex (MOF74-Mg) composed of magnesium and 2,5-dihydroterephthalic acid. A porous metal complex (MIL101) composed of chromium and terephthalic acid.

[0056] Even among porous metal complexes, the BET specific surface area varies depending on the synthesis method and purity.

[0057] When the adsorbed substance is a polar substance such as water or carbon dioxide, it is preferable for the porous metal complex to have adsorption sites, as this improves the adsorption performance for the adsorbed substance. Examples of adsorption sites include open metal sites (coordination unsaturated sites). Open metal sites exhibit high adsorption activity. Therefore, porous metal complexes having open metal sites exhibit a very fast adsorption rate of the adsorbed substance in the treated gas and demonstrate high adsorption performance.

[0058] One example of an open metal site is a site in which the metal ion is coordination-unsaturated and has at least one empty site in its coordination state, i.e., a coordination-unsaturated site.

[0059] As shown in Figure 1, porous metal complexes with coordination-unsaturated sites have unsaturated ligands for the metal ion (Fe ion in Figure 1), and the metal ion has one or more empty ligands (empty sites). The target substance is adsorbed onto these empty sites. Porous metal complexes with coordination-unsaturated sites exhibit high adsorption performance.

[0060] Specific examples of porous metal complexes having coordination unsaturated sites include PCN250, MOF74-Ni, MOF74-Mg, and MIL101. Among these, PCN250 is preferred because it has a fast adsorption / desorption rate and uses a metal with low water resistance and toxicity.

[0061] In addition to porous metal complexes with open metal sites, porous metal complexes that exhibit high adsorption performance, that is, porous metal complexes with adsorption sites, include porous metal complexes that have OH groups (hydroxyl groups) near the metal.

[0062] As shown in Figure 2, porous metal complexes having OH groups near the metal have OH groups in the metal core unit. When porous metal complexes have OH groups in the metal core unit, they exhibit excellent adsorption activity for the adsorbed substance. Therefore, porous metal complexes having OH groups near the metal exhibit very fast adsorption and desorption rates of the adsorbed substance in the treated gas, resulting in high adsorption performance.

[0063] A metal core unit refers to a metal cluster that constitutes a porous metal complex, represented by MxOyHz (where x and y are non-zero integers, and z is an integer including 0). Some of the oxygen atoms in the metal core unit MxOyHz are carboxyl group oxygen atoms of organic ligands, and the metal core unit forms a framework through the sharing of oxygen atoms among the organic ligands.

[0064] Specific examples of porous metal complexes having OH groups near the metal include MOF801 and MOF303.

[0065] Porous materials can take various forms, such as powder, granules, or fibers. The adsorption sheet contains numerous powdered or granular porous materials.

[0066] (Physical properties of porous materials) The size of the porous material is not particularly limited, but is preferably 0.1 μm or larger, more preferably 0.5 μm or larger, and more preferably 1 μm or larger. On the other hand, the size of the porous material is not particularly limited, but is preferably 200 μm or smaller, more preferably 150 μm or smaller, more preferably 100 μm or smaller, and more preferably 80 μm or smaller.

[0067] When the size of the porous material is between 0.1 μm and 200 μm, the gas to be treated can be brought into good contact with the porous material, improving the adsorption performance of the porous material. Furthermore, when the size of the porous material is between 0.1 μm and 200 μm, the pressure loss when the gas to be treated comes into contact with the porous material can be reduced, the porous material can be supported on the adsorption sheet at a high density, and at the same time, the shedding of the porous material from the adsorption sheet can be reduced.

[0068] The size of porous materials is measured by the D50 value of a laser diffraction particle size distribution analyzer or by the average particle diameter measured by a scanning electron microscope.

[0069] The pore structure of a porous material is not particularly limited. If the porous material is a porous metal complex, the pore structure of the porous metal complex may be one-dimensional or three-dimensional. From the viewpoint of a fast adsorption rate of the adsorbed substance and ease of adsorption of the adsorbed substance, it is preferable that the pores of the porous metal complex be one-dimensional. Specific examples of porous metal complexes having one-dimensional pores include PCN250, MOF303, and MOF74.

[0070] When a porous metal complex has three-dimensional pores but lacks open metal sites, it is preferable that the crystallite size of the porous metal complex is small in order to facilitate the adsorption of target substances into the interior of the pores. Specific examples of porous metal complexes that lack open metal sites and have three-dimensional pores include MOF801.

[0071] The pore size of the porous material is not particularly limited. When the porous material is a porous metal complex, and the adsorbed substance is a relatively small polar substance such as water or carbon dioxide, the pore size of the porous metal complex is preferably 3.0 Å or larger, and more preferably 3.5 Å or larger, from the viewpoint of improving the adsorption performance to the adsorbed substance. On the other hand, the pore size of the porous metal complex is preferably 10 Å or smaller, and more preferably 8 Å or smaller.

[0072] If the pore size of the porous metal complex is between 3.0 Å and 10 Å, the adsorbed substance can be effectively adsorbed into the pores, thereby improving the adsorption performance of the porous metal complex. Furthermore, if the pore size of the porous metal complex is between 3.0 Å and 10 Å, the adsorbed substance can be easily detached from the porous metal complex during regeneration.

[0073] When prioritizing the improvement of the adsorption performance of porous metal complexes by accelerating the desorption rate, it is preferable that the pore size of the porous metal complex is greater than 10 Å.

[0074] The pore size of porous metal complexes can be determined by measuring the cage diameter or window diameter of the pores using X-ray structural analysis.

[0075] When the porous material is silica gel, the pore diameter of the silica gel is not particularly limited. When the adsorbed substance is a polar substance such as water or carbon dioxide, from the viewpoint of improving the adsorption performance for the adsorbed substance, the average pore diameter is preferably 30 Å or less. On the other hand, from the viewpoint of improving the desorption performance for the adsorbed substance, the pore diameter of the silica gel is preferably 70 Å or less in terms of the average pore diameter. In order to balance the adsorption performance and the desorption performance, a plurality of different types of silica gels in the range of 10 Å to 70 Å in terms of the average pore diameter may be mixed in an arbitrary ratio according to the target performance and used.

[0076] When the porous material is zeolite, since the pore diameter of the zeolite is substantially determined by the crystal structure, the crystal structure of the zeolite corresponding to the purpose may be selected, and two or more types of zeolites may be mixed and used.

[0077] The specific surface area (BET specific surface area) measured by the BET method of the porous material is not particularly limited. When the porous material is a porous metal complex, the specific surface area (BET specific surface area) measured by the BET method of the porous metal complex is preferably 200 m 2 / g or more, more preferably 300 m 2 / g or more, more preferably 500 m 2 / g or more, more preferably 900 m 2 / g or more, more preferably 1,000 m 2 / g or more, more preferably 1,500 m 2 / g or more, more preferably 1,800 m 2 / g or more.

[0078] The BET specific surface area of the porous metal complex is preferably 6,000 m 2 / g or less, more preferably 2,500 m 2 / g or less, more preferably 2,000 m 2 / g or less.

[0079] When the specific surface area of the porous metal complex is 200 m 2 / g or more and 6,000 m 2When the concentration is less than / g, the target substance can be effectively adsorbed into the pores, improving the adsorption performance of the porous metal complex. 2 / g or more 6,000m 2 If the amount is less than / g, porous metal complexes can be easily manufactured. The specific surface area of ​​the porous metal complex is 2,500 m². 2 If the value is less than / g, sufficient strength of the porous metal complex can be ensured.

[0080] If the porous material is silica gel, the specific surface area of ​​silica gel measured by the BET method is preferably 200 m². 2 It is 300m or more / g, and more preferably 300m 2 It is 1 / g or more, and more preferably 400m 2 It is 1 / g or more.

[0081] When the porous material is zeolite, the specific surface area of ​​the zeolite measured by the BET method is preferably 200 m². 2 / g or more 900m 2 It is less than / g.

[0082] The bulk density of the porous material is not particularly limited, but is preferably 0.2 g / cc or more, and more preferably 0.23 g / cc or more. When the bulk density of the porous material is 0.2 g / cc or more, the gaps between multiple porous materials can be reduced, and the porous material can be supported on the adsorption sheet at a high density. Therefore, when the bulk density of the porous material is 0.2 g / cc or more, the adsorption sheet can effectively adsorb the target substance in the gas being treated.

[0083] The bulk density of a porous material is measured by dividing the volume by the weight of the porous material when it is filled to the brim in a container of known volume.

[0084] When the porous material is a porous metal complex, the water adsorption rate of the porous metal complex at 25°C and a relative pressure of 0.5 is not particularly limited, but is preferably 30% by mass or more, more preferably 35% by mass or more, and more preferably 40% by mass or more.

[0085] The pressure at which adsorption appears to stop under constant pressure (number of adsorbed molecules = number of desorbed molecules) is called the adsorption equilibrium pressure, and relative pressure is the ratio of the adsorption equilibrium pressure to the saturated vapor pressure.

[0086] By containing a porous metal complex with a water adsorption rate of 30% by mass or more at 25°C and a relative pressure of 0.5, the adsorbent sheet can hold a large amount of adsorbent material and is given high flexibility during processing. Furthermore, because the porous metal complex provides sufficient flexibility to the adsorbent sheet, the amount of organic binder conventionally contained in the adsorbent sheet to provide flexibility can be reduced. As a result, the proportion of side chains of the organic binder adsorbing into the pores of the porous material and blocking the pores can be reduced, improving the adsorption performance of the porous material.

[0087] The water adsorption rate of porous metal complexes at 25°C and a relative pressure of 0.5 was determined by taking approximately 100 mg of the porous metal complex (before treatment with water or organic solvent), vacuum drying it at 120°C for 12 hours, weighing it, and then using a high-precision gas / vapor adsorption analyzer (BELSORP-max, manufactured by Nippon Bell Co., Ltd.), measuring the amount of water vapor adsorbed at 25°C at 40 points while gradually increasing the relative pressure in the range of 0.02 to 0.95, and creating an adsorption isotherm.

[0088] At this time, the target relative pressure was set to 0.001, 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9, and the allowable increase / decrease in adsorption amount was 30 cm for relative pressures of 0 to 0.3. 2 / g, relative pressure 0.3-0.5 at 50cm 2 / g, relative pressure 0.5~ at 30cm 2 Set the value to / g and create an adsorption isotherm. Then, calculate the water adsorption rate [%] from the amount of water adsorbed per gram of porous metal complex at a relative pressure of 0.5 using the following formula a. Water adsorption rate = Amount of water adsorbed per gram of porous metal complex [g] × 100 (Equation a)

[0089] The content of porous material in the adsorption sheet is not particularly limited, but is preferably 40% by mass or more, and more preferably 50% by mass or more. On the other hand, the content of porous material is not particularly limited, but is preferably 85% by mass or less, and more preferably 83% by mass or less. When the content of porous material is 40% by mass or more and 85% by mass or less, the porous material can be supported on the adsorption sheet at a high concentration, so the adsorption sheet can effectively adsorb the target substance in the gas to be treated. When the content of porous material is 40% by mass or more and 85% by mass or less, the shedding of porous material from the adsorption sheet can be reduced, and the strength of the adsorption sheet can be sufficiently ensured.

[0090] The porous material may contain one or more of the silica gel, zeolite, and porous metal complexes mentioned above. Furthermore, the porous material may also contain porous materials other than the silica gel, zeolite, and porous metal complexes mentioned above, such as organic polymer porous bodies including activated carbon, activated alumina, aluminophosphate, silicoaluminophosphate, and styrene-divinylbenzene copolymer.

[0091] (Porous material content) The adsorption sheet of this disclosure contains silica gel and / or porous metal complex in an amount of 40% to 85% by mass, more preferably 45% to 83% by mass, even more preferably 50% to 83% by mass, and particularly preferably 55% to 83% by mass, as such. This is because (1) A: pore capacity at mesopores to macropores (3 nm to 500 μm) (measured by mercury intrusion method), and B: pore capacity at micropores (less than 3 nm) (measured by N2 adsorption method), (2) B, which directly causes gas adsorption and affects the adsorption / desorption rate, and A, which acts as a driving force for approaching the micropores, and (3) by applying it to a dehumidifier, the gas diffusion within the adsorption sheet can be improved, thereby improving the dehumidification performance.

[0092] <Textiles> The fibers that make up the adsorption sheet are not particularly limited, and for example, natural fibers, synthetic fibers, regenerated fibers, semi-synthetic fibers, inorganic fibers, etc., can be used.

[0093] Examples of natural fibers include cotton, linen, and pulp.

[0094] Specific examples of synthetic fibers include aramid fibers, meta-aramid fibers, polybenzimidazole fibers, polybenzoxazole fibers, polyimide fibers, polyamideimide fibers, polyetherketone fibers, polyethylene terephthalate fibers, and nylon fibers.

[0095] Examples of regenerated fibers include rayon, polynosic, and cupro. Examples of semi-synthetic fibers include acetate fibers and triacetate fibers.

[0096] Specific examples of inorganic fibers include glass fibers, ceramic fibers, and rock wool fibers.

[0097] The fibers that make up the adsorption sheet may be a combination of two or more of the fibers described above.

[0098] The fibers constituting the adsorption sheet preferably contain both non-fibrillated fibers and fibrillated fibers.

[0099] Because the adsorbent sheet contains non-fibrillated fibers, it is possible for the adsorbent sheet to maintain its corrugated shape when it is processed, for example, into a corrugated shape.

[0100] Because the adsorption sheet contains fibrillated fibers, it is possible to efficiently support porous materials with the adsorption sheet. The inclusion of fibrillated fibers in the adsorption sheet also reduces the amount of organic binder required to fix the porous material to the sheet, thereby preventing the organic binder from clogging the pores of the porous material and improving the adsorption performance of the porous material.

[0101] The fiber diameter of the non-fibrillated fibers is not particularly limited, but is preferably 5 μm or more and 30 μm or less.

[0102] The fiber length of the non-fibrillated fibers is not particularly limited, but is preferably 1 mm or more, and more preferably 2 mm or more. The fiber length of the non-fibrillated fibers is not particularly limited, but is preferably 10 mm or less, and more preferably 8 mm or less.

[0103] If the non-fibrillated fibers have a fiber diameter of 5 μm or more and a fiber length of 1 mm or more, sufficient strength can be ensured for the adsorption sheet, and the adsorption sheet can maintain its corrugated shape when it is processed, for example, into a corrugated shape. If the non-fibrillated fibers have a fiber diameter of 30 μm or less and a fiber length of 10 mm or less, the adsorption sheet has appropriate flexibility, and processing such as corrugation can be easily performed on the adsorption sheet. The non-fibrillated fibers may be a mixture of fibers with different fiber diameters and lengths.

[0104] Fibrillated fibers are, for example, fibers obtained by fibrillating non-fibrillated fibers as described above. The method of fibrillation is not particularly limited, and conventionally known methods such as beating methods using beating machines such as beaters and refiners can be employed.

[0105] The fibrillated fibers are not particularly limited, but it is preferable that the Canadian standard filtration efficiency (CSF), measured according to JIS P 8121-2, is 50 mL or more and less than 800 mL.

[0106] The total content of non-fibrillated and fibrillated fibers in the adsorbent sheet is not particularly limited, but is preferably 5% by mass or more, and more preferably 10% by mass or more. On the other hand, the total content of non-fibrillated and fibrillated fibers in the adsorbent sheet is not particularly limited, but is preferably 45% by mass or less.

[0107] When the total content of non-fibrillated and fibrillated fibers in the adsorption sheet is between 5% by mass and 45% by mass, it is possible to support a sufficient amount of porous material on the adsorption sheet, and the shedding of porous metal complexes from the adsorption sheet can be reduced. When the total content of non-fibrillated and fibrillated fibers in the adsorption sheet is between 5% by mass and 45% by mass, sufficient strength of the adsorption sheet can be ensured.

[0108] <Organic Binder> The organic binder contained in the adsorption sheet is not particularly limited as long as it can fix the porous material to the adsorption sheet. Examples of organic binders that can be used include polyvinyl alcohol (PVA) polymers, polyacrylonitrile polymers, polyethylene polymers, polyester polymers, and polyphenylene ether polymers. A preferred example of an organic binder, from the viewpoint of handling, is a polyvinyl alcohol (PVA) polymer.

[0109] The form of the organic binder is not particularly limited, but a fibrous organic binder is preferred because it allows for the easy fabrication of an adsorption sheet.

[0110] The content of the organic binder in the adsorption sheet is not particularly limited, but is preferably 3% by mass or more, and more preferably 4% by mass or more. On the other hand, the content of the organic binder in the adsorption sheet is not particularly limited, but is preferably 20% by mass or less, and more preferably 18% by mass or less.

[0111] When the organic binder content in the adsorption sheet is between 3% and 20% by mass, sufficient support and flexibility of the porous material can be ensured in the adsorption sheet. When the organic binder content in the adsorption sheet is between 3% and 20% by mass, the proportion of side chains of the organic binder adsorbing into the pores of the porous material and blocking the pores can be reduced, thereby improving the adsorption performance of the porous material.

[0112] The organic binder plays a role in improving the flexibility of the adsorption sheet. Even with a low content of the organic binder in the adsorption sheet, the inclusion of fibrillated fibers allows the adsorption sheet to exhibit good load-bearing properties for porous materials, and the high moisture adsorption rate of the porous material enables the adsorption sheet to exhibit flexibility. As a result, the content of the organic binder in the adsorption sheet can be reduced, and as a result of reducing the content of the organic binder, clogging of the pores of the porous material by the organic binder can be suppressed, thereby improving the adsorption performance of the porous material.

[0113] The dissolution temperature of the organic binder in water is not particularly limited, but is preferably 65°C or higher, and more preferably 70°C or higher. On the other hand, the dissolution temperature of the organic binder in water is not particularly limited, but is preferably 100°C or lower.

[0114] If the dissolution temperature of the organic binder in water is between 65°C and 100°C, the proportion of the side chains of the organic binder adsorbing to the pores of the porous material and blocking them can be reduced, thereby improving the adsorption performance of the porous material. Furthermore, if the dissolution temperature of the organic binder in water is between 65°C and 100°C, the adhesive strength of the organic binder can be effectively exhibited, and the porous material can be effectively supported on the adsorption sheet by the organic binder.

[0115] The dissolution temperature of organic binders in water can be measured using conventionally known methods. One example of such a method involves placing 100 mL of pure water in a beaker, stirring it, and heating it in an oil bath until the water temperature reaches 50°C. 0.5 g of organic binder is then added to the heated water, and the water temperature is increased at a rate of 2°C / min. The temperature is measured when the organic binder begins to dissolve and the water becomes semi-transparent.

[0116] <Cationic surfactants> In addition to the porous material, fibers, and organic binder described above, the adsorbent sheet contains a cationic surfactant as a water-repellent agent for the purpose of providing water repellency. The water-repellent agent causes the adsorbent sheet to exhibit water repellency.

[0117] If the adsorption sheet is water-repellent, when manufacturing an adsorption element with a honeycomb structure using the adsorption sheet, for example, even if a silica-based inorganic adhesive is applied to the adsorption sheet, it is possible to suppress the penetration of the silica-based inorganic adhesive into the adsorption sheet before it hardens. Because the adhesive is less likely to penetrate the adsorption sheet before it hardens, the adsorption sheets can be bonded to each other well, making it easier to manufacture the adsorption element. If the adsorption sheet is water-repellent, it is possible to suppress the penetration of the adhesive into the adsorption sheet and block the pores of the porous material, thereby suppressing a decrease in the adsorption performance of the porous material in the adsorption element.

[0118] Cationic surfactants are not particularly limited, and examples include amine salts and quaternary ammonium salts. Examples of amine salts include aliphatic amidoamines. Examples of quaternary ammonium salts include monoalkyl types, monoalkyl ether types, dialkyl types, dialkyl ester types, and benzalkonium types.

[0119] Cationic surfactants preferably have a long-chain alkyl chain and an amide moiety in their primary structure. The long-chain alkyl chain and amide moiety may exist within a single compound or as separate compounds. A preferred example of a cationic surfactant having a long-chain alkyl chain and an amide moiety is "Santol KL-2" manufactured by Nikka Chemical Co., Ltd.

[0120] <Cationic surfactants having long alkyl chains and amide moieties> Cationic surfactants having a long alkyl chain and an amide moiety contain a substructure of the following chemical formula (R) in their surfactant structure. 1 =C, R 2 , R 3 = C or H) and R 1 It contains an alkyl chain with 5 to 30 carbon atoms. Or, R 1 The alkyl chain and CO-NR in the chemical formula 2 R 3 The amide moiety may exist within a single compound or as part of a separate compound.

[0121] [ka]

[0122] The adsorption sheet contains a cationic surfactant having a long-chain alkyl chain and an amide moiety. Due to the long-chain alkyl chain, the adsorption sheet exhibits good water repellency. The inclusion of an amide moiety in the cationic surfactant allows for good dispersibility of the cationic surfactant in solvents such as water and good adsorption to fibers during the manufacturing process of the adsorption sheet, resulting in the effect of uniformly supporting the cationic surfactant on the adsorption sheet.

[0123] Cationic surfactants having long alkyl chains and amide moieties are added as water repellents to porous materials, fibers, and organic binders that are used as raw materials when manufacturing adsorbent sheets by the wet papermaking method.

[0124] Whether an adsorption sheet or an adsorption element manufactured using an adsorption sheet contains a cationic surfactant having a long-chain alkyl chain and an amide moiety can be confirmed by pyrolysis gas chromatography-mass spectrometry (pyrolysis GC-MS). Specifically, 0.1 g of sheet material cut from an adsorption sheet or adsorption element is mixed with 1 mL of chloroform, and then ultrasonic extraction is performed at room temperature for 30 minutes. Then, 0.5 g of the extract obtained by ultrasonic extraction is placed in a sample cup for pyrolysis GC-MS, the chloroform is removed from the extract, and then pyrolysis GC-MS is performed.

[0125] The conditions for the pyrolysis GC-MS are as follows: Gas chromatograph-mass spectrometry (GC-MS) is performed on the gas components generated by the pyrolysis reaction of the sample. By detecting peaks of fragment ions with m / z = 59 and 72, which are characteristic of compounds containing amide moieties with long-chain alkyl chains, it can be confirmed that the adsorption sheet or adsorption element contains a cationic surfactant having long-chain alkyl chains and amide moieties.

[0126] [Conditions for pyrolysis GC-MS] • Equipment: PY-2020iD (Frontier LAB) / QP-2010Plus (manufactured by Shimadzu Corporation) • Sample heating conditions: 550°C × 0.5 min • Column: Ultra ALLOY-5 (MS / HT) (Length 30m, Inner diameter 0.25mm, Film thickness 0.25μm) Column temperature: 50°C (2 min) - 20°C / min - 320°C (10 min) • Inlet pressure: 80kPa ·Inlet temperature: 320℃ • Split ratio: 30 • Ion source: EI method Ion source temperature: 250℃ Ionization voltage: 70eV Interface temperature: 320℃ • MS measurement mode: SIM and / or SCAN • Measured ions: m / z 29-550 in SCAN mode, m / z 59, 72 in SIM mode

[0127] <Method for manufacturing an adhesive sheet> The method for manufacturing the adsorbent sheet is not particularly limited, but a wet papermaking method is a preferred example.

[0128] (Wet paper making method) The adsorbent sheet of this disclosure preferably contains an appropriate amount of flocculant (wet papermaking method), while adjusting the porosity during the production of the adsorbent sheet to maintain a state in which the fibers and adsorbent are constantly dispersed.

[0129] (1) Preparation of dispersed slurry When manufacturing an adsorbent sheet using the wet papermaking method, first, porous material, fibers, and an organic binder are dispersed and mixed in a solvent such as water or an organic solvent in a predetermined ratio.

[0130] <Agglutinant> In the manufacture of adsorbent sheets, in addition to porous materials, fibers, and organic binder raw materials, as well as water repellents, polymer flocculants may also be added as additives.

[0131] Polymer flocculants are chemicals used to flocce and precipitate porous materials, fibers, and organic binders dispersed in a solvent during the manufacture of adsorbent sheets.

[0132] For the polymer flocculant, conventionally known flocculants can be used. Preferably, cationic polymer flocculants, amphoteric polymer flocculants, anionic / nonionic polymer flocculants, etc. are used. More preferably, cationic polymer flocculants are used. For organic polymer flocculants, for example, Tetsufloc (registered trademark) manufactured by Nippon Steel Mining Co., Ltd. can be used.

[0133] The suspension is thoroughly stirred, and while maintaining the dispersion of porous materials, fibers, organic binders, etc., a flocculant is added dropwise at a rate of approximately 10 ml / g relative to the total materials, and an adsorption sheet is prepared using a wet papermaking method.

[0134] (2) Sheet formation process Next, the obtained dispersed slurry is processed into a sheet using a paper machine.

[0135] In the sheet-forming process, it is preferable to mix the porous material with other materials while solvent molecules have penetrated the pores of the porous material.

[0136] If a porous material does not contain solvent molecules within its pores, the organic binder constituting the adsorption sheet may become trapped within those pores. In this case, it is difficult to remove the organic binder trapped within the pores of the porous material after it has been formed into a sheet, which may reduce the adsorption performance of the adsorption sheet.

[0137] By trapping solvent molecules within the pores of the porous material, the organic binder is prevented from penetrating and becoming trapped in the pores of the porous material during the sheet-forming process. After the sheet-forming process, the solvent molecules are removed from the pores by a desolvation treatment, thereby ensuring the adsorption performance of the adsorbent sheet.

[0138] When manufacturing an adsorption sheet by trapping solvent molecules within the pores of a porous material, if solvent molecules remain in the pores of the porous material, the porous material will not exhibit sufficient adsorption performance.

[0139] Desolvation treatment is performed on the adsorption sheet to allow the porous material to fully exhibit its adsorption performance.

[0140] The conditions for the desolvation treatment are not particularly limited. For example, the temperature of the desolvation treatment is not particularly limited, but is preferably 50°C or higher, and more preferably 80°C or higher. The temperature of the desolvation treatment is not particularly limited, but is preferably 300°C or lower, and more preferably 200°C or lower.

[0141] When the desolvation treatment temperature is between 50°C and 300°C, there is less risk of the pore structure of the porous material being destroyed, and the solvent can be efficiently removed from the pores of the porous material.

[0142] The desolvation treatment is preferably carried out under reduced pressure. This allows for more efficient removal of the solvent from the pores of the porous material. The pressure of the desolvation treatment is not particularly limited and can be adjusted as appropriate according to the physical properties and proportions of the porous material, but is preferably 10. 3 Pa or less, more 10 -1 The pressure for the desolvation treatment is not particularly limited, but is preferably 10. -5 It is Pa or higher.

[0143] The duration of the desolvation treatment is not particularly limited, but is preferably 20 seconds or more, and more preferably 30 seconds or more. The duration of the desolvation treatment is not particularly limited, but is preferably 5 minutes or less, more preferably 3 minutes or less, and more preferably 1 minute or less.

[0144] The most preferred conditions for desolvation treatment are under vacuum conditions, with a temperature between 80°C and 200°C, and a treatment time between 20 seconds and 5 minutes.

[0145] (3) Dehydration and drying process Then, by dewatering and drying the resulting sheet-like material, an adsorbent sheet is obtained.

[0146] The dewatering and drying methods are not particularly limited, and conventionally known methods can be used. Examples of dewatering methods include a method of pressurized dewatering by passing a sheet-like material between a pair of rolls, and a method of lifting an absorbent sheet onto a mesh and letting the moisture drain by its own weight. Examples of drying methods include sun drying and a method of blowing hot air onto the dewatered sheet-like material.

[0147] <Shape and physical properties of the adhesive sheet, Figure 3(A)> As shown in Figure 3(A), the adhesive sheet can be used in a liner-like (flat) form, but it can also be processed to create a desired shape by pleating, honeycomb (stepped), or corrugating as appropriate.

[0148] The flexibility of the adsorption sheet is not particularly limited, but it is preferable that the specific tensile elongation, used as an indicator of flexibility, be 5%·m / g or higher. When the specific tensile elongation of the adsorption sheet is 5%·m / g or higher, the processability of the adsorption sheet is good, and when using the adsorption sheet to manufacture, for example, an adsorption element with a honeycomb structure, it is possible to suppress cracking or other damage to the adsorption sheet even when the adsorption sheet is corrugated.

[0149] The specific tensile elongation of the adsorption sheet is determined by drying a 15 mm x 100 mm sample piece cut from the adsorption sheet at 120°C for 1 hour and measuring its weight. The dried sample piece is then left to stand at 25°C and in a 75% RH atmosphere for 1 hour, and the maximum point elongation [%] is measured using a tensile / compression testing machine (TENSILON RTG-1310, A&D Corporation). The chuck distance is 50 mm and the tensile speed is 15 mm / min. Based on the obtained data, the specific tensile elongation [%·m / g] is calculated using the following formula (equation b).

[0150] Specific tensile elongation = Maximum point elongation [%] / Sample width [m] / Basis weight of adsorbent sheet [g / m²] 2 ] (formula b)

[0151] The thickness of the adsorption sheet is not particularly limited, but is preferably 0.1 mm or more. The thickness of the adsorption sheet is preferably 0.9 mm or less, and more preferably 0.7 mm or less. When the thickness of the adsorption sheet is 0.1 mm or more and 0.9 mm or less, the strength of the adsorption sheet can be sufficiently ensured when processing the adsorption sheet to manufacture the adsorption element, and the increase in pressure loss of the adsorption element manufactured by processing the adsorption sheet can be suppressed.

[0152] The basis weight of the adsorbent sheet is not particularly limited, but is preferably 25 g / m². 2 The above is preferable to 40 g / m². 2 That concludes the explanation. The basis weight of the adsorbent sheet is preferably 200 g / m². 2 The following, preferably 150 g / m² 2 The following applies:

[0153] The basis weight of the adsorbent sheet is 25 g / m². 2 More than 200g / m 2 The following conditions ensure sufficient thickness of the adsorption sheet and suppress the reduction in strength, making it easier to process the adsorption sheet and manufacture the adsorption element: The basis weight of the adsorption sheet is 25 g / m². 2 More than 200g / m 2 The following conditions can prevent the thickness of the adsorption sheet from becoming too large, thereby suppressing the increase in pressure loss of the adsorption element manufactured by processing the adsorption sheet.

[0154] Pore ​​capacity determined by mercury intrusion method: A (or C) Pore ​​capacity at relative pressure p / p0 = 0.4, determined by N2 adsorption isotherm: B (or D) >

[0155] (Measurement of pore volume determined by mercury intrusion method) The sample was cut into approximately 10 mm x 20 mm pieces and then vacuum-dried at 150°C for 24 hours. Porosity was measured using a Micromeritics AutoPoreIV 9520. The pore size measurement range was approximately 3 nm to 500 μm.

[0156] The pore volume of the adsorption sheet, specifically the mesopore to macropore (3 nm to 500 μm) range, is measured using the mercury intrusion method.

[0157] (Pore volume B at relative pressure p / p0 = 0.4, determined by N2 adsorption isotherm) Take a 50 mg sample, vacuum-dry it overnight at 150°C, and then weigh it.

[0158] Using a high-precision gas / vapor adsorption analyzer (BELSORP-maxII, manufactured by MicrotracBEL), the amount of nitrogen gas adsorbed at the boiling point of liquid nitrogen (-195.8°C) was measured with a relative pressure of 3.0 × 10⁻⁶. -8 Measure 80 points while gradually increasing the value within the range of ~0.99, and create an adsorption isotherm.

[0159] Using the included analysis software (BELMaster Version 7.3.2.0) with the instrument, the BET method was used, with the relative pressure set to approximately 3 nm, corresponding to p / p0 = 0.4, to determine the pore volume [cm³]. 3 Find the value of / g.

[0160] The pore capacity of the B: micropores (less than 3 nm) of the adsorption sheet is measured using an N2 adsorption isotherm.

[0161] The adsorption sheet of this disclosure (1) adjusts the pore capacity of A: mesopores to macropores (3 nm to 500 μm) (measured by mercury intrusion method) and B: micropores (less than 3 nm) (measured by N2 adsorption method), (2) B, which is directly caused by gas adsorption and affects the adsorption / desorption rate, and A, which acts as a driving force for approaching the micropores, and (3) by applying it to a dehumidifier, the gas diffusion within the adsorption sheet can be improved, thereby improving the dehumidification performance. Let A cc / g be the pore volume determined by the mercury intrusion method. When the pore volume at a relative pressure p / p0 = 0.4, determined by the N2 adsorption isotherm, is defined as B cc / g, The value of B / A, obtained by dividing B by A, is preferably 0.25 or less, more preferably 0.23 or less, even more preferably 0.2 or less, and particularly preferably 0.18 or less.

[0162] The adsorption sheet of the present disclosure adjusts (1) A: pore volume in mesopores to macropores (3 nm to 500 μm) (measured by mercury intrusion porosimetry), and B: pore volume in micropores (less than 3 nm) (measured by N2 adsorption method), (2) B, which is directly caused by gas adsorption and affects the adsorption / desorption rate, and further A becomes the driving force for approaching the micropores, and (3) by applying it to a dehumidifier, the gas diffusivity in the adsorption sheet can be improved and the dehumidification performance can be improved. Therefore, Let the pore volume in the pore diameter range of 3 nm to 500 μm be C cc / g, When the pore volume at a relative pressure p / p0 = 0.4 in the pore diameter range of less than 3 nm is D cc / g, The value of D / C obtained by dividing D by C is preferably 0.25 or less, more preferably 0.23 or less, still more preferably 0.2 or less, and particularly preferably 0.18 or less.

[0163] It is important that B << A (or D << C) for the adsorption sheet of the present disclosure. Due to B / A (or D / C) being 0.25 or less, gas diffusion in the adsorption sheet can be performed with high efficiency.

[0164] The range of A (or C) for the adsorption sheet of the present disclosure is preferably 1.5 to 3, and more preferably 1.5 to 2.8.

[0165] The range of B (or D) for the adsorption sheet of the present disclosure is preferably 0.1 to 0.4, and more preferably 0.1 to 0.38.

[0166] <Step-processed sheet, FIGS. 3(B), (C)> The step-processed sheet of the present disclosure is bonded with the adsorption sheet of the present disclosure, bonds the planar adsorption sheet and the wavy adsorption sheet, and has a number of cells serving as air passages.

[0167] The corrugated sheet of this disclosure is formed by laminating the adhesive sheet of this disclosure. A flat suction sheet and a corrugated suction sheet (a suction sheet processed into a corrugated shape) are bonded together. It has numerous cells that serve as air passages.

[0168] When processing the adsorbent sheet into a pleated, honeycomb, corrugated, or other shape, flexibility may be imparted to the adsorbent sheet by allowing sufficient moisture to be adsorbed into a porous material, thereby making the sheet easily bendable. Alternatively, the adsorbent sheet may be processed in a semi-dry state until it is completely dry, and then completely dried after processing.

[0169] Figure 3(B) shows an example of adsorption sheet processing, specifically adsorption sheet 1B (wave-shaped adsorption sheet) that has been processed into a corrugated shape.

[0170] Figure 3(C) shows a stepped sheet (C) formed by laminating a corrugated adhesive sheet 1B, shown in Figure 3(B), onto a liner-shaped adhesive sheet 1A, shown in Figure 3(A). The stepped sheet (C) is manufactured by bonding multiple bottoms 10 of the corrugated adhesive sheet (wave-shaped adhesive sheet) 1B to the surface 11 of the liner-shaped adhesive sheet 1A using an adhesive 12.

[0171] The adhesive 12 is not particularly limited, but from the viewpoint of heat resistance, a silica-based inorganic adhesive is preferably used. Specific examples of silica-based inorganic adhesives include water glass, silica sol, and alumina sol.

[0172] The adhesive 12 may be a mixture of an inorganic adhesive and an organic adhesive. Specific examples of organic adhesives include, for example, one or more organic adhesives selected from phenolic resins, epoxy resins, acrylic resins, urethane resins, polyester resins, melamine resins, silicone resins, fluororesins, and copolymers thereof.

[0173] <Laminated structure with stepped processing, Figure 4> The stepped laminate of the present disclosure is formed by laminating stepped sheets of the present disclosure.

[0174] The stepped laminate of this disclosure has a number of cells per unit area of ​​the surface through which air passes: 80 cells / cm². 2 More than 135 pieces / cm 2 The following applies:

[0175] The stepped laminate of this disclosure (1) adjusts the pore capacity of mesopores to macropores (3 nm to 500 μm) (measured by mercury intrusion method) and B: the pore capacity of micropores (less than 3 nm) (measured by N2 adsorption method), (2) B, which is directly caused by gas adsorption and affects the adsorption / desorption rate, and A, which acts as a driving force for approaching the micropores, and (3) by applying it to a dehumidifier, the gas diffusion within the adsorption sheet can be improved and the dehumidification performance can be improved, so preferably it is 80 particles / cm 2 More than 135 pieces / cm 2 The following is more more than 85 pieces / cm 2 More than 120 pieces / cm 2 The following, and more preferably 90 pieces / cm 2 More than 115 pieces / cm 2 The following applies:

[0176] The stepped laminate of this disclosure is The porous material contains silica gel and / or a porous metal complex. Let A cc / g be the pore volume determined by the mercury intrusion method. When the pore volume at a relative pressure p / p0 = 0.4, determined by the N2 adsorption isotherm, is defined as B cc / g, The value of B / A, obtained by dividing B by A, is 0.25 or less.

[0177] The stepped laminate of this disclosure is The porous material contains silica gel and / or a porous metal complex. The pore volume for pores with a diameter in the range of 3 nm to 500 μm is defined as C cc / g. When the pore volume at a relative pressure p / p0 = 0.4 in the range of pore diameter less than 3 nm is defined as D cc / g, The value of D / C, obtained by dividing D by C, is 0.25 or less.

[0178] The pore capacity A determined by the mercury intrusion method, the pore capacity B at a relative pressure p / p0=0.4 determined by the N2 adsorption isotherm, the pore capacity C in the range of pore diameters from 3 nm to 500 μm, and the pore capacity D at a relative pressure p / p0=0.4 in the range of pore diameters less than 3 nm are as described above.

[0179] The stepped laminate of this disclosure is formed by stacking stepped sheets of this disclosure.

[0180] Figure 4 shows an example of a stepped laminate. The stepped laminate shown in Figure 4(B) is formed by winding the stepped sheet (C) shown in Figure 3(C) in a rotor shape, as shown in Figure 4(A), and exhibits a honeycomb structure.

[0181] <Adsorption element> The adsorption element of this disclosure comprises the stepped laminate of this disclosure.

[0182] Adsorption elements are manufactured by shaping one or more adsorption sheets into a predetermined form or structure. For example, an adsorption element can be manufactured by laminating a corrugated adsorption sheet onto a liner-shaped adsorption sheet using an adhesive (a stepped sheet), and then winding it in a rotor shape to produce a stepped laminate with a honeycomb structure.

[0183] The adsorption element consists of a stepped laminate. The adsorption element is installed in the flow path of the gas to be treated in a dehumidifier (adsorption / desorption treatment device). The dehumidifier brings the gas to be treated into contact with the adsorption element, thereby adsorbing the target substance contained in the gas onto the porous material in the adsorption element.

[0184] Adsorption elements are manufactured by using one or more multi-layered laminates to create a structure that suits the application and purpose. The type of adsorption element is not particularly limited, and any conventionally known type can be used.

[0185] By using a pleated adsorption sheet, a straight-flow adsorption element can be manufactured. By using a honeycomb-shaped adsorption sheet, a parallel-flow adsorption element can be manufactured.

[0186] Direct-flow and parallel-flow adsorption elements have a structure with a large contact area with the gas being treated, resulting in high adsorption performance for the target substance, while simultaneously achieving low pressure loss for the adsorption element.

[0187] Parallel flow adsorption elements are superior to direct-flow adsorption elements in terms of preventing clogging due to mist and debris, reducing pressure loss, and being lighter, making them more preferable for use in adsorption and desorption processing devices.

[0188] <Dehumidifier, Figure 5> The dehumidifier of this disclosure comprises a rotating body, an adsorption zone air supply passage, and a regeneration zone air supply passage.

[0189] The rotating body is a rotating body that rotates the adsorption element of the present disclosure around a rotation axis, and has an adsorption zone and a regeneration zone along the circumferential direction which is the direction of rotation of the rotating body.

[0190] The adsorption zone air supply channel is an adsorption zone air supply channel that supplies the air to be treated to the adsorption zone, allowing the adsorption element to adsorb moisture from the air.

[0191] The regeneration zone air supply channel is a channel that supplies regeneration air to the regeneration zone for desorption of moisture from the adsorption element that has adsorbed moisture.

[0192] A dehumidifier (adsorption / desorption processing device) is a device equipped with an adsorption element, which is configured to adsorb substances contained in the gas to be treated onto a porous material by bringing the gas to be treated into contact with the adsorption element, and to desorb the substances from the porous material by bringing a regenerating gas into contact with the adsorption element that has adsorbed the substances.

[0193] The dehumidifier of this disclosure comprises a rotating body, an adsorption zone air supply passage, and a regeneration zone air supply passage.

[0194] The rotating body of a dehumidifier is a rotating body that rotates an adsorption element around a rotation axis, and has an adsorption zone and a regeneration zone along the circumferential direction, which is the direction of rotation of the rotating body.

[0195] The adsorption zone air supply path of a dehumidifier supplies the air to be treated to the adsorption zone, and the moisture in the air is adsorbed by the adsorption element.

[0196] The regeneration zone air intake path of the dehumidifier supplies regeneration air to the regeneration zone to desorb moisture from the adsorption element that has adsorbed moisture.

[0197] The dehumidifier is a rotor-rotating type continuous adsorption / desorption processing device 3, as shown in Figure 5, for example. The continuous adsorption / desorption processing device 3 includes a cylindrical adsorption element 4 that can rotate around a rotation axis L by the drive of a motor. The adsorption element 4 includes a stepped laminated body 2 with a honeycomb structure, as shown in Figure 4(B), for example. The adsorption element 4 is divided into an adsorption zone 40 and a desorption zone 41 along the circumferential direction around the rotation axis L, and the stepped laminated body 2 moves alternately between the adsorption zone 40 and the desorption zone 41 as the adsorption element 4 rotates.

[0198] The gas to be processed is supplied to the adsorption zone 40 of the adsorption element 4 by the drive of the fan 5. As it passes through the stepped laminate 2 located in the adsorption zone 40, the adsorbable substances contained in the gas to be processed are adsorbed by the porous material contained in the stepped laminate 2. The regenerated gas is heated by a heat source 6 such as a heater and supplied to the desorption zone 41 of the adsorption element 4 by the drive of the fan 7. As it passes through the stepped laminate 2 located in the desorption zone 41, the adsorbable substances are desorbed from the porous material. In this way, the porous material is regenerated.

[0199] Rotor-type dehumidifiers are not limited to the examples described above; other conventionally known types can also be used. Dehumidifiers are not limited to rotor-type dehumidifiers.

[0200] The adsorption sheet, stepped processing sheet, stepped processing laminate, adsorption element, and dehumidifier can be used for various applications such as air dehumidification, air deodorization, air purification, gas separation, etc. The adsorption sheet, stepped processing sheet, stepped processing laminate, adsorption element, and dehumidifier can be used indoors, in vehicles, on wallpapers, furniture, interior materials, resin molded bodies, electrical equipment, etc. for the purpose of reducing malodorous components and the like.

[0201] The adsorption sheet, stepped processing sheet, stepped processing laminate, adsorption element, and dehumidifier can be used for the purpose of separating and recovering organic solvents in the air discharged from factories and the like. The adsorption sheet, stepped processing sheet, stepped processing laminate, adsorption element, and dehumidifier can be used for the purpose of adjusting and dehumidifying the air in spaces inside various vehicles such as automobiles, trains, airplanes, etc., in addition to houses, buildings, condominiums, hospitals, factories, commercial facilities.

[0202] The adsorption sheet of the present disclosure adjusts A: the pore volume (measured by mercury intrusion method) in mesopores to macropores (3 nm to 500 μm), and B: the pore volume in micropores (less than 3 nm) (measured by N2 adsorption method).

[0203] The adsorption sheet of the present disclosure directly results from gas adsorption and becomes the driving force for A to approach the micropores, which affects the adsorption / desorption rate.

[0204] It is important that B << A (or D << C) for the adsorption sheet of the present disclosure, and due to B / A (or D / C) being 0.25 or less, gas diffusion within the adsorption sheet can be carried out with high efficiency.

[0205] For the adsorption sheet of the present disclosure, the range of A (or C) is preferably 1.5 to 3, and more preferably 1.5 to 2.8.

[0206] For the adsorption sheet of the present disclosure, the range of B (or D) is preferably 0.1 to 0.4, and more preferably 0.1 to 0.38.

[0207] By applying the adsorption sheet (stepped sheet, stepped laminate, and adsorption element) of this disclosure to a dehumidifier, the gas diffusion within the adsorption sheet can be improved, thereby improving the dehumidification performance.

[0208] One embodiment of the adsorption sheet, corrugated sheet, corrugated laminate, adsorption element, and dehumidifier of this disclosure has been described. The adsorption sheet, corrugated sheet, corrugated laminate, adsorption element, and dehumidifier of this disclosure are not limited to the embodiment described above, and various modifications are possible without departing from the spirit of this disclosure. [Examples]

[0209] The operation and effects of the adsorption sheet of this disclosure will be specifically explained with reference to examples of the adsorption sheet of this disclosure. The adsorption sheet of this disclosure is not limited to the examples provided.

[0210] (Example 1) Sodium silicate with an SiO2 / Na2O molar ratio of 2.9 was added dropwise to 18% by weight sulfuric acid to produce silica hydrogel. The produced silica hydrogel was washed with a large amount of water, then immersed in sulfuric acid adjusted to pH=4 at a temperature of 30°C for about 2 hours, filtered, and dried at 150°C to obtain silica gel.

[0211] The above-prepared silica gel was mixed in a ratio of 60% by mass (excluding solvent molecules), 16% by mass of aramid fibers as non-fibrillated fibers, 10% by mass of aramid fibers as fibrillated fibers, and 14% by mass of polyvinyl alcohol (PVA) fibers with a water dissolution temperature of 70°C (catalog value) as an organic binder, and the mixture was thoroughly stirred.

[0212] The suspension is thoroughly stirred, and while maintaining dispersion, the polymer flocculant Tetsufloc (manufactured by Nippon Steel Mining Co., Ltd.) is added dropwise at a rate of 10 ml / g to the total material, resulting in a basis weight of 75 g / m². 2 An adsorbent sheet was prepared using a wet papermaking method with the following mass.

[0213] Furthermore, the adsorption sheet was subjected to a desolvation treatment at 130°C to obtain an adsorption sheet. The porosity of the obtained adsorption sheet was measured using the mercury intrusion method.

[0214] Furthermore, it was confirmed that the flat and corrugated sheets of the created adsorption sheet could be bonded together using vinyl acetate adhesive to the extent that the honeycomb adhesive portion would not peel off, creating a honeycomb structure (stepped sheet), and then the stepped sheet could be wrapped around a core material using the same vinyl acetate adhesive to the extent that the adhesive portion would not peel off (stepped laminate), and processed into a cylindrical element (adsorption element) with a thickness of 200 mm and an outer diameter of 300 mm in a rotor shape.

[0215] The adhesive content ratio for this rotor-shaped cylindrical honeycomb adsorption element (adsorption element) was 8.2 wt%.

[0216] The dehumidification performance was evaluated using this rotor-shaped cylindrical honeycomb adsorption element (adsorption element).

[0217] (Example 2) A mixture of silica gel prepared in the same manner as in Example 1 (80% by mass, excluding solvent molecules), aramid fibers (8% by mass as non-fibrillated fibers), aramid fibers (5% by mass as fibrillated fibers), and PVA fibers (7% by mass as the same as in Example 1) as an organic binder was mixed and thoroughly stirred.

[0218] For other operations, the same procedures as in Example 1 were followed to produce an adsorption sheet using the wet papermaking method, and the porosity of the adsorption sheet was measured using the mercury intrusion method.

[0219] Furthermore, similar to Example 1, a rotor-shaped cylindrical adsorption honeycomb element (adsorption element) was created using the prepared adsorption sheet, and its dehumidification performance was evaluated.

[0220] (Example 3) 50 g of Fe(NO3)3·9H2O and 10 g of azobenzene-3,3'-5,5'-tetracarboxylic acid were dissolved in 2 L of N,N-dimethylformamide and 1 L of acetic acid, and heated at 150 °C for 24 hours to synthesize PCN250.

[0221] The prepared PCN250 sample was mixed at a ratio of 60% by mass (excluding solvent molecules), 16% by mass of non-fibrillated aramid fiber as non-fibrillated fiber, 10% by mass of fibrillated aramid fiber as fibrillated fiber, and 14% by mass of the same PVA fiber as in Example 1 as an organic binder, and stirred well.

[0222] The suspension was stirred well, and while maintaining the dispersed state, the polymer flocculant Tetfloc (manufactured by Nippon Steel Mining Co., Ltd.) as a flocculant was dropped at 10 ml / g based on all materials, and a wet paper-making method was used to produce an adsorption sheet with a basis weight of 65 g / m 2 to obtain an adsorption sheet.

[0223] Furthermore, the adsorption sheet was subjected to a solvent removal treatment at 130 °C to obtain an adsorption sheet. For the obtained adsorption sheet, a porosity measurement by mercury intrusion porosimetry was carried out.

[0224] Furthermore, in the same manner as in Example 1, a rotor-shaped cylindrical adsorption honeycomb element (adsorption element) was created using the created adsorption sheet, and the dehumidification performance was evaluated.

[0225] (Example 4) The PCN250 sample prepared by the same treatment as in Example 3 was mixed at a ratio of 80% by mass (excluding solvent molecules), 8% by mass of non-fibrillated aramid fiber as non-fibrillated fiber, 5% by mass of fibrillated aramid fiber as fibrillated fiber, and 7% by mass of the same PVA fiber as in Example 1 as an organic binder, and stirred well.

[0226] For other operations, the same operations as in Example 3 were carried out, an adsorption sheet was produced by the wet paper-making method, and for the adsorption sheet, a porosity measurement by mercury intrusion porosimetry was carried out.

[0227] Furthermore, similar to Example 1, a rotor-shaped cylindrical adsorption honeycomb element (adsorption element) was created using the prepared adsorption sheet, and its dehumidification performance was evaluated.

[0228] (Comparative Examples 1 and 2) 30g / m² as base material 2 A glass nonwoven fabric was used. The glass nonwoven fabric was impregnated with an aqueous sodium silicate solution with an SiO2 / Na2O molar ratio of 2.9, and then partially dried using a dryer until it was ready for honeycomb (step) processing.

[0229] Comparative Example 1 has a cell count per unit area of ​​the surface through which air passes: 95 cells / cm². 2 A waveform sheet was created. In Comparative Example 1, the number of cells was set to 95 cells / cm². 2 When the material was prepared, severe cell clogging occurred, making it impossible to obtain a clean waveform sheet, and therefore, a honeycomb element could not be obtained.

[0230] Comparative Example 2 uses a cell count of 30 cells / cm² per unit area of ​​the surface through which air passes. 2 A waveform sheet was created.

[0231] In Comparative Example 2, it was confirmed that the flat and corrugated sheets of the adsorption sheet were then bonded together using an emulsion containing amorphous silica and water to the extent that the honeycomb adhesive portion did not peel off, forming a honeycomb structure. Furthermore, a stepped sheet was wrapped around the core material using the same emulsion to the extent that the adhesive portion did not peel off, and it was confirmed that it was possible to process it into a cylindrical element with a thickness of 200 mm and an outer diameter of 300 mm in a rotor shape.

[0232] A cylindrical element was immersed in 18% by weight sulfuric acid to produce a honeycomb element on which silica hydrogel was supported. After washing the produced silica hydrogel with a large amount of water, it was immersed in sulfuric acid adjusted to pH=4 at a temperature of 30°C for about 2 hours, and after drying at 150°C, a honeycomb element on which silica gel was supported was obtained.

[0233] We evaluated the dehumidification performance using this rotor-shaped cylindrical honeycomb adsorption element.

[0234] (Dehumidification performance evaluation) (1) The adsorption element is fixed in an adsorption / desorption chamber with an adsorption zone:regeneration zone ratio of 3:1. (2) The gas to be treated, with a temperature of 25°C and a humidity of 5.4 g / kg-DA, is supplied to the adsorption zone at a passing air velocity of 2 m / s. (3) Detachable zone: Temperature 140°C, humidity 5.4 g / kg-DA

[0235] The removal rate (%) was calculated using the following method. Removal rate % = (Adsorption zone inlet humidity 5.4 g / kg-DA - Adsorption zone outlet humidity g / kg-DA) / (Adsorption zone inlet humidity 5.4 g / kg-DA) * 100

[0236] (Measuring by mercury intrusion method) The sample was cut into approximately 10 mm x 20 mm pieces and then vacuum-dried at 150°C for 24 hours. Porosity was measured using a Micromeritics AutoPoreIV 9520. The pore size measurement range was approximately 3 nm to 500 μm.

[0237] The pore volume of the adsorption sheet, specifically the mesopore to macropore (3 nm to 500 μm) range, is measured using the mercury intrusion method.

[0238] (N2 adsorption isotherm) Take a 50 mg sample, vacuum-dry it overnight at 150°C, and then weigh it.

[0239] Using a high-precision gas / vapor adsorption analyzer (BELSORP-maxII, manufactured by MicrotracBEL), the amount of nitrogen gas adsorbed at the boiling point of liquid nitrogen (-195.8°C) was measured with a relative pressure of 3.0 × 10⁻⁶. -8 Measure 80 points while gradually increasing the value within the range of ~0.99, and create an adsorption isotherm.

[0240] Using the included analysis software (BELMaster Version 7.3.2.0) with the instrument, the BET method was used, with the relative pressure set to approximately 3 nm, corresponding to p / p0 = 0.4, to determine the pore volume [cm³].3 Find [ / g].

[0241] According to the N2 adsorption isotherm, measure the pore volume of B: micropores (less than 3 nm) of the adsorption sheet.

[0242]

Table 1

[0243] It is presumed that the porosity changes depending on the amount of fibrillated fibers. For example, when the adsorbent content is 80% by weight, the other fibers are 20% by weight. The amount of fibrillated fibers in the examples is 5% by weight.

[0244] In the region where the amount of fibrillated fibers is as small as 1% by weight or less, inevitably, the amount of desiccant is small, and the dehumidification performance tends to decrease.

[0245] In the region where the amount of fibrillated fibers is as large as about 20% by weight, the paper loses its strength, and the step processing property tends to decrease.

Industrial Applicability

[0246] The adsorption sheet of the present disclosure adjusts the pore volume at A (or C): mesopores to macropores (3 nm to 500 μm) (measured by mercury intrusion method), and B (or D): micropores (less than 3 nm) (measured by N2 adsorption method).

[0247] The adsorption sheet of the present disclosure is directly caused by gas adsorption, and B (or D), which affects the adsorption / desorption rate, and further A (or C) serve as a driving force for approaching micropores.

[0248] It is important that B << A (or D << C) for the adsorption sheet of the present disclosure. By B / A (or D / C) being 0.25 or less, gas diffusion within the adsorption sheet can be performed with high efficiency.

[0249] In the adsorption sheet of this disclosure, the range of A (or C) is preferably 1.5 to 3, and more preferably 1.5 to 2.8.

[0250] In the adsorption sheet of this disclosure, the range of B (or D) is preferably 0.1 to 0.4, and more preferably 0.1 to 0.38.

[0251] By applying the adsorption sheet (stepped sheet, stepped laminate, and adsorption element) of this disclosure to a dehumidifier, the gas diffusion within the adsorption sheet can be improved, thereby improving the dehumidification performance.

Claims

1. It is an adhesive sheet, The porous material contains silica gel and / or a porous metal complex. Let A cc / g be the pore volume determined by the mercury intrusion method. N 2 When the pore volume at a relative pressure p / p0 = 0.4, determined by adsorption isotherms, is defined as B cc / g, The value of B / A (B divided by A) is less than or equal to 0.

25. Adhesive sheet.

2. It is an adhesive sheet, The porous material contains silica gel and / or a porous metal complex. The pore volume for pores with a diameter in the range of 3 nm to 500 μm is defined as C cc / g. When the pore volume at a relative pressure p / p0 = 0.4 in the range of pore diameter less than 3 nm is defined as D cc / g, The value of D / C, obtained by dividing D by C, is less than or equal to 0.

25. Adhesive sheet.

3. The adsorption sheet according to claim 1 or 2, containing 40% to 85% by mass of the silica gel and / or porous metal complex.

4. It is a corrugated sheet, The adhesive sheets described in claim 1 are bonded together, The flat suction sheet and the corrugated suction sheet are bonded together, It has numerous cells that form air passages. Corrugated sheet.

5. A laminated body obtained by stacking the laminated sheets described in claim 4.

6. The number of cells per unit area of ​​the surface through which air passes is 80 cells / cm². 2 More than 135 pieces / cm 2 The stepped laminate according to claim 5, which is as follows:

7. A stepped laminate, The porous material contains silica gel and / or a porous metal complex. Let A cc / g be the pore volume determined by the mercury intrusion method. N 2 When the pore volume at a relative pressure p / p0 = 0.4, determined by adsorption isotherms, is defined as B cc / g, The adsorption sheet has a value of B / A, which is 0.25 or less, obtained by dividing B by A. Stepped laminate.

8. A stepped laminate, The porous material contains silica gel and / or a porous metal complex. The pore volume for pores with a diameter in the range of 3 nm to 500 μm is defined as C cc / g. When the pore volume at a relative pressure p / p0 = 0.4 in the range of pore diameter less than 3 nm is defined as D cc / g, The value of D / C, obtained by dividing D by C, is less than or equal to 0.

25. Stepped laminate.

9. Adsorption element comprising a stepped laminate according to claim 5, 7, or 8.

10. It is a dehumidifier, It comprises a rotating body, an air supply passage for the adsorption zone, and an air supply passage for the regeneration zone. The rotating body is a rotating body that rotates the adsorption element described in claim 9 around a rotation axis, and has an adsorption zone and a regeneration zone along the circumferential direction which is the rotation direction of the rotating body. The adsorption zone air supply passage is an adsorption zone air supply passage that supplies the air to be treated to the adsorption zone and adsorbs the moisture in the air by the adsorption element. The regeneration zone air supply passage is a regeneration zone air supply passage that supplies regeneration air to the regeneration zone for desorption of moisture from the adsorption element that has adsorbed moisture. Dehumidifier.

Images