JP2936127B2 - Hygroscopic element and dehumidifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture absorbing element and, more particularly, to a moisture absorbing element and a dehumidifier using an organic polymer electrolyte as a moisture absorbent .

[0002]

2. Description of the Related Art Zeolite and other molecular sieves,
Honeycomb elements for dehumidification using inorganic moisture absorbents such as silica gel and alumina gel have been used for many years. On the other hand, the applicant of the present invention in Japanese Patent Publication Nos. 1-2564 and 5-81831 formed a honeycomb laminate using paper made of inorganic fibers as a main component and formed at a low density, impregnated with water glass, and then immersed in an acid or metal salt aqueous solution. A silica gel or a metal silicate gel was produced and combined to produce a dehumidifying element. This dehumidifying element is used for dehumidifying air in various fields such as semiconductor industry, film industry, food industry, military use (drying of electronic device parts) and the like.

[0003]

THE INVENTION Problems to be Solved] Zeolite Other motor <br/> Rekiyurashi parts are intended to utilize the adsorptive by the micro holes in it with crystals to moisture absorption, the diameter of the micropores is exactly constant doing. However, when using this molecular sieve, the dehumidification performance in the low humidity area is high,
In the high humidity region, there is a defect that the dehumidification performance is inferior. When air contains a polymerizable organic volatile substance, it causes a polymerization reaction in the micropores of the zeolite, and the hygroscopic capacity is drastically reduced.

[0004] A dehumidifying element in which a honeycomb laminated body is formed from the above-mentioned low-density inorganic fiber paper, impregnated with water glass and then immersed in an acid or metal salt aqueous solution to fix silica gel or metal silicate gel is used. Although the dehumidifying performance is excellent, there is a disadvantage that a large amount of heat energy is required at the time of desorption and regeneration because the heat capacity of the moisture absorbent itself and the heat capacity of the honeycomb adsorbent are large as in the case of using the above-mentioned zeolite and other inorganic moisture absorbents.

[0005]

DISCLOSURE OF THE INVENTION The present invention overcomes the above-mentioned drawbacks, has excellent moisture absorption performance, is lighter in weight than the above-mentioned inorganic moisture absorbent such as silica gel or metal silicate gel, and has almost half the heat capacity. Therefore, a heat absorbing element which requires very little heat energy for regeneration and does not cause a polymerization reaction when air containing a polymerizable organic solvent is treated during dehumidification.
It is intended to provide a dehumidifying device .

The object of the present invention is to provide a method for absorbing moisture in which fine particles of an organic polymer electrolyte having an ionizing group chemically bonded in a molecule are uniformly impregnated and fixed over the entire surface of a sheet according to the present invention .
Moisture-containing formed by laminating as having many small holes of the sheet
The present invention is attained by providing a dehumidifier using the element and the moisture absorbing element . In preparing the sheet, fine particles of the above-mentioned organic polymer electrolyte may be mixed together with the stock, and the paper may be made to prepare a sheet for absorbing moisture. Alternatively, organic polymer electrolyte fine particles are adhered to the metal sheet via an adhesive to absorb moisture.
The use sheet may be created.

The organic polymer electrolyte used as a moisture absorbent in the present invention is, for example, Diaion SK manufactured by Mitsubishi Kasei Corporation.
1B H-type or Na-type, Dow Chemical's Dowex Ion HCR-SH-type or Na-type, Sumitomo Chemical's Duolite C-20SH-type or Na-type, Organo's Amberlite 1R-120B H-type or Na-type Particles that do not deteriorate in moisture absorption performance even when crushed are used as fine particles.

A dispersion obtained by dispersing the above-mentioned organic polymer electrolyte powder in an appropriate binder solution is impregnated and fixed on a low-density porous sheet mainly composed of inorganic fibers to obtain a moisture-absorbing sheet. Alternatively, the organic polymer electrolyte fine particles are mixed as a hygroscopic agent into the paper stock, and the paper is made to obtain a hygroscopic sheet. Alternatively, the sheet for moisture absorption may be further impregnated and fixed with the organic polymer electrolyte. Further, an organic polymer electrolyte powder may be appropriately attached to the metal sheet via an adhesive. This moisture-absorbing sheet is formed into a laminate having a honeycomb shape or other appropriate space and stacked to obtain a moisture-absorbing element . Alternatively, a laminate obtained by stacking porous sheets or metal sheets having a small density having an inorganic fiber as a main component with a honeycomb shape or other appropriate gaps, and a dispersion obtained by dispersing an organic polymer electrolyte powder in an appropriate binder liquid is used. The powder of the organic polymer electrolyte is fixed on all the sheets constituting the laminate by impregnating or applying to the laminate and dried to obtain a moisture absorbing element . In this case, a conventional adsorption-type inorganic hygroscopic agent such as zeolite or silica gel in powder form may be mixed into the organic polymer electrolyte. Alternatively, the organic polymer electrolyte or another moisture absorbing agent may be further impregnated and fixed to a moisture absorbing element obtained by laminating paper made by mixing the above organic polymer electrolyte into paper stock.

In Japanese Patent Publication Nos. 1-2564 and 5-81831, a powder of an organic polymer electrolyte is dispersed in an aqueous solution of water glass, and a porous sheet or a metal sheet having a low density containing inorganic fibers as a main component or a metal sheet thereof. Coating or impregnating and drying the laminate, immersing it in an aqueous acid or metal salt solution to form and bond active silica gel or active metal silicate gel to the fiber gap and the surface of the sheet or to the surface of the metal sheet to form a moisture absorbing element obtain.

As an example of the organic polymer electrolyte having an ionizing group chemically bonded in the molecule used in the present invention, a strongly acidic cation exchange resin sodium (neutral) will be described. this is

## STR1 ## and styrene and divinylbenzene, as shown in are those having a sodium sulfonate group (-SO 3 _Na) as the ionizing groups chemically bonded in some places of the benzene ring of the three-dimensionally copolymerized synthetic resin .

[0011] The ionizing groups, such as _-SO ³ - ^H +, -S
^{_{O 3 - Na +, -COO -}} H +, -COO - Na +, -
N ⁺ (CH ₃ ) ₃ OH ⁻ and —N ⁺ (CH ₃ ) ₃ Cl ⁻ are generally hydrophilic, thereby imparting hygroscopicity to the organic polymer electrolyte. Further, the organic polymer electrolyte has a large number of pores due to its three-dimensional structure, and the pores increase the ability to adsorb and hold water by capillary action or the like. The organic polymer electrolyte having a water content of about 30 to 80% at room temperature can be produced by changing the raw materials, polymerization conditions, types of ionizing groups and their proportions. This organic polymer electrolyte has a good physical strength, is hydrophilic, but insoluble in water, has heat resistance of 60 to 150 ° C., and is superior to silica gel in hygroscopicity.

[0012]

Example 1 70 parts by weight of ceramic fiber, pulp 10
As shown in FIG. 2, corrugated paper 1 was prepared using an inorganic fiber paper made of a composition of 20 parts by weight of an organic / inorganic mixed binder and having a thickness of 0.22 mm and a basis weight of 80 g / m ² .
And the flat paper 2 are adhered to each other to have a wavelength of P3.4 mm and a wave height of H1.
An 8 mm half-wave molded body is formed, and the half-wave molded body is laminated to obtain a honeycomb-shaped laminated body having small holes 3 penetrated on both sides as shown in FIG. The bulk specific gravity of this honeycomb-shaped laminate after drying is about 110 kg / m ³ . Next, this honeycomb-shaped laminate is placed in a firing furnace and fired for about 5 hours with hot air at a temperature of 600 ° C. at an oxygen content of 10% or less. The bulk specific gravity of the honeycomb laminated body after firing is about 90 kg / m ³ .

[0013] Then the Mitsubishi Kasei Corporation of 100 parts by weight fine particles of Diaion SK 1B H-shaped as desiccant is dispersed in 200 parts by weight of silica sol (40% solids), the fired honeycomb-shaped laminate described above to the dispersion After immersion for several minutes, it is dried with hot air at about 120 ° C. for about 2 hours to obtain a moisture absorbing element .
The bulk specific gravity of the obtained moisture absorbing element was about 210 kg / m ³ .

[0014]

Example 2 A corrugated paper 1 and a flat paper 2 mainly composed of the above-mentioned inorganic fibers are alternately stacked to form a laminate as shown in FIG. 100 parts of Diaion S from Mitsubishi Kasei as an organic polymer electrolyte
K 1B Na-type fine particles (40 parts when dried) are added,
The laminate was immersed in the mixture for several minutes, and then dried at 50 to 90 ° C. for about 1 hour to form a mixture of the hydrated water glass having a water content of 3 to 20% and the fine particles. honeycomb intake of aluminum silicate gel is tightly bound in a state in which the organic polymer electrolyte particles in fiber interstices and surface of the inorganic fiber paper is uniformly dispersed by reaction with% was immersed in an aqueous solution of water glass and aluminum sulfate
Obtain a wet element .

[0015]

Example 3 The inorganic fiber paper used in Example 1 was used as a hygroscopic agent by Dowex Ion HCR-S manufactured by Dow Chemical Company.
100 parts by weight of H-form powder (when dried) and synthetic zeolite 4
40 parts of A type powder and silica sol (solid content 30%) 30
The dispersion dispersed in 0 parts is impregnated and dried for several minutes to obtain a moisture absorbing sheet.

As shown in FIG. 4, the moisture-absorbing sheets 2 are stacked with spacers 4, for example, rods made of synthetic resin or metal, sandwiched at appropriate intervals and fixed, and stacked between a large number of moisture- absorbing sheets. A moisture-absorbing element comprising a laminated block with a gap maintained is obtained.

[0017]

Embodiment 4 An aluminum sheet having a thickness of 0.01 to 0.3 mm, preferably an aluminum sheet having a large number of pores, was used as a water-insoluble organic polymer electrolyte as a Diaion SK 1B Na type of Mitsubishi Kasei Co., Ltd. A dispersion obtained by dispersing the above powder in a silica sol-based binder is applied and dried, and is fixed on the aluminum sheet surface to obtain a moisture absorbing sheet. A honeycomb rotor having a diameter of 320 mmφ and a width of 100 mm was formed by alternately laminating the corrugated sheet and the flat sheet of the moisture absorbing sheet.

[0018]

Example 5 40 to 60 parts by weight of inorganic fibers such as ceramics fiber and glass fiber, 5 to 20 parts by weight of wood pulp, 10 to 20 parts by weight of paper strength enhancer such as starch and polyvinyl acetate, and organic polymer electrolyte A paper stock having a composition of 50 to 20 parts by weight of fine particles is made to obtain a sheet for moisture absorption having a thickness of about 0.15 to 0.3 mm. Other moisture absorbents such as zeolite and silica gel may be added to the above stock. This moisture absorbing sheet is laminated and formed so as to have a large number of small holes as shown in FIG. 3 or FIG. 4 to obtain a moisture absorbing element . Further, if the above-mentioned laminate was immersed in a dispersion obtained by mixing and dispersing the above organic polymer electrolyte or another hygroscopic agent in silica sol, and the hygroscopic agent was fixed and dried, the hygroscopic ability was further improved. Moisture absorption
An element is obtained.

[0019]

The cylindrical honeycomb-shaped hygroscopic element shown in Example 1
The rotor is assembled as a rotor 5 into a dehumidifier as shown in FIG. p. h. It is used to obtain dry air and the like by continuously adsorbing and desorbing moisture contained in the air while rotating the air.

As shown in FIG . 5, the rotor 5 is rotatably held in a casing 6 and separated into a processing zone 8 and a regeneration zone 9 by a separator 7, and the rotor 5 is rotated by a geared motor 10 and a driving belt 11 so that the Is fed into the processing zone 8 and the high-temperature regenerated air 13 is fed into the regenerating zone 9 in opposite directions, and the moisture contained in the processing air 12 is continuously adsorbed and removed to obtain dry air 14. . The rotor adsorbing the moisture rotates in the regeneration zone 9 while rotating.
At this time, moisture is continuously desorbed by passing regeneration air 13 having a high temperature of, for example, 80 to 150 ° C. to regenerate the rotor 5. In the drawing, 15 is a pulley, 16 is a tension pulley, 17 is a rubber seal, and 18 is a regeneration air heater.

In order to use the rectangular parallelepiped moisture-absorbing element shown in FIGS.
And dry air is obtained by absorbing and removing moisture contained in the air. When the moisture absorbing element is saturated with moisture, the regeneration air 13 heated by a heater (not shown) is preferably fed from the opposite direction to the processing air to desorb moisture and absorb moisture.
Regenerate the element . By repeating this adsorption / desorption operation, dry air is obtained. Also, by combining two such devices, dry air can be continuously obtained.

The method of using high-temperature air for desorption and regeneration has been described above in the section of operation. In this case, the sheet used for the honeycomb laminate and the moisture absorbing agent, ie, the temperature at which the organic polymer electrolyte does not deteriorate, are fixed to the sheet. (80-150
It is necessary to play in ℃).

[0023]

As described above, the moisture absorbing element and the dehumidifying device of the present invention use an organic polymer electrolyte which has an ionizing group chemically bonded in the molecule and is insoluble in water as a moisture absorbing agent. The density is about half that of the hygroscopic agent of the prior application, ie active silica gel or active metal silicate gel, and the heat capacity of the hygroscopic element obtained by using this is the same shape and size as active silica gel or active metal silicate. Moisture-absorbing sheet obtained using an inorganic moisture absorbent such as gel; and
The heat capacity of the regenerated air is about 65% of the heat capacity of the moisture absorbing element, and the heat quantity of the regeneration air is consumed by the heat quantity required for desorption of the adsorbed moisture and the heat quantity required for temperature rise of the moisture absorbent. Then, the amount of heat energy consumed for increasing the temperature of the regeneration zone of the moisture absorbing element is reduced.

In the adsorption zone of the dehumidifier shown in FIG. 5, it is necessary to cool the element portion heated in the regeneration zone. However, in the dehumidification rotor of the present invention, heat energy due to a rise in the temperature of the regeneration zone is small. Therefore, the amount of energy required for cooling the element portion heated in the reproduction zone is also reduced. In the case of a conventional inorganic moisture absorbent such as silica gel, the micropores perform an adsorption function, and also absorb odorous substances simultaneously with moisture, but the organic polymer electrolyte used in the present invention has a very small amount of odorous substances adsorbed. .

In the zeolite used for moisture absorption, there is a portion of a negative ion of aluminum in the micropore due to its structure, and a positive ion corresponding thereto exists somewhere in the micropore. The part of these ions becomes an adsorption site (site) and adsorbs water molecules. Depending on the type of the corresponding cation, the zeolite is acidic or basic. This is advantageous when zeolite is used as a catalyst, but causes various problems when it is used for dehumidification. For example, in addition to moisture, air containing aldehydes, ketones, styrene, or other polymerizable compounds such as vinyl monomers, can be used to absorb air.
Acts as zeolite acid or base catalyst when by connexion dehumidifying the child, an organic compound rich in said polymerizable gradually polymerize to become a non-volatile substance, which causes cause clogging of micropores of the zeolite, There is a defect that significantly reduces the dehumidifying performance of the moisture absorbing element .

[0026] The above zeolite when ionized groups chemically bonded in the molecule of the organic polymer electrolyte used in the present invention to which to use a neutral e.g. sodium sulfonate group (-SO 3 _Na) It has a very important characteristic that it does not cause a catalytic action as in the case of and does not deteriorate the moisture absorbing ability.

The organic polymer electrolyte used in the present invention may be, for example, a copolymer of styrene and divinylbenzene as a cross-linking agent and a sodium sulfonate group, as described in the above-mentioned example of the strongly acidic cation exchange resin sodium form. −
The introduction of SO ₃ Na) is a technology that has been established for a long time, and its products are stable in quality because many types of ion exchange resins are mass-produced. The quality as a hygroscopic agent can be freely adjusted, and the effect is obtained at a low price.

The diameter 320mmφ prepared according to Example,
In contrast to the honeycomb rotor for dehumidification of the present invention in which a honeycomb rotor having a width (L) of 100 mm is fixed or impregnated with 35% by weight of Mitsubishi Chemical Corporation Diaion SK 1B Na type based on the weight of the honeycomb rotor according to Example 2 and Example 6. As an example, a dehumidifier shown in FIG. 5 is assembled by using a honeycomb rotor for a dehumidifier in which active silica gel of 60% with respect to the weight of the honeycomb laminated body is generated and fixed by a chemical reaction. FIG. 6 shows the results of a dehumidification performance test performed under the condition that the absolute humidity is the same as the absolute humidity at the inlet of the processing air, that is, the absolute humidity and temperature at the processing outlet of the supply air.

[0029] For example the absolute humidity when using inorganic fiber paper to moisture absorption sheet is 8 g / kg, moisture absorbent Diaion SK
In the case of 1B Na type, the vertical axis and the lower curve at an inlet humidity of 8 g / kg in FIG.
If the processing outlet air humidity at the intersection with the mark) is read, it is 2.4 g /
kg (point A), and in the case of activated silica gel under the same conditions, it becomes 2.9 g / kg (point B) as shown by the mark. That is, when the organic polymer electrolyte of the present invention is used, the dehumidifying efficiency is increased by 14% as compared with the case where activated silica gel is used. In addition, it turns out that the dehumidification performance is excellent also in a high humidity area.

A metal sheet such as aluminum is used as the moisture absorbing sheet, and Diaion SK 1B Na is used as a moisture absorbing agent.
As can be seen from FIG. 6, when the mold was used, an effect equal to or higher than that when the inorganic fiber sheet was used was obtained. The reason for this is that when a laminate of aluminum sheets is regenerated, the heat conductivity is good, so that the reproduction is uniform and the dehumidifying effect is high.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a dehumidifying element.

FIG. 2 is a perspective view showing an example of a half-wave molded body.

FIG. 3 is a perspective view showing another example of the dehumidifying element.

FIG. 4 is a perspective view showing still another example of the dehumidifying element.

FIG. 5 is a partially cutaway perspective view showing an example of a dehumidifier.

FIG. 6 is a graph showing the dehumidifying performance of the dehumidifying element.

[Description of Signs] I Corrugated paper 2 Flat paper 3 Small perforated hole 5 Honeycomb rotor 8 Processing zone 9 Regeneration zone 12 Processing air 13 Regeneration air 14 Dry air

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B01J 20/28 B01D 53/26 B01D 53/28

Claims (8)

(57) [Claims] [Claim 1] insoluble organic polyelectrolyte water has ionizing groups that chemically bond in the molecule is established as desiccant is
A moisture absorbing element constituted by a laminated body made of a sheet . Wherein other organic polyelectrolytes insoluble have water ionizing groups chemically bonded in the molecule insoluble in water as the moisture absorbent
Laminate consisting of a sheet that has been fixed together with a moisture absorbent
The moisture absorbing element thus configured . (3) The compound has an ionizing group chemically bonded in the molecule and is incompatible with water.
Soluble polyelectrolyte with active metal silicate gel
A laminate consisting of sheets that have been established as a moisture absorbent
Moisture absorbing element constituted by: 4. It has an ionizing group chemically bonded in the molecule and is incompatible with water.
Water-soluble organic polymer electrolyte fine particles used as paper absorbent
The structure is made up of a laminate of moisture-absorbing sheets
The formed moisture absorbing element . 5. A compound having an ionizing group chemically bonded in a molecule and having no ion in water.
Using water soluble organic polymer electrolyte microparticles as a moisture absorbent
Mixed with the paper stock together with the fine particles of the moisture-insoluble absorbent
Absorption constituted by a laminate composed of wet moisture absorbing sheets
Element . 6. An ionizing group chemically bonded in a molecule is neutral.
6. The method according to claim 1, wherein an organic polymer electrolyte is used.
A moisture absorbing element according to any of the above . 7. A dehumidifier using a honeycomb element comprising a honeycomb body having an ionizable group chemically bonded in a molecule and having a water-insoluble organic polymer electrolyte fixed as a moisture absorbent . 8. A sheet for absorbing moisture using an organic absorbent made of a sheet having an ionizable group chemically bonded in the molecule and having a water-insoluble organic polymer electrolyte fixed as a moisture absorbent is stacked with a spacer interposed therebetween. A dehumidifier using a moisture absorbing element .