CN112125815A - Ionic liquid-based humidity control material for air conditioner - Google Patents

Ionic liquid-based humidity control material for air conditioner Download PDF

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CN112125815A
CN112125815A CN202010868096.9A CN202010868096A CN112125815A CN 112125815 A CN112125815 A CN 112125815A CN 202010868096 A CN202010868096 A CN 202010868096A CN 112125815 A CN112125815 A CN 112125815A
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ionic liquid
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伊藤敏幸
中山浩
李建新
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Sinowin Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C215/00—Compounds containing amino and hydroxy groups bound to the same carbon skeleton
    • C07C215/02—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton
    • C07C215/04—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being saturated
    • C07C215/06—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being saturated and acyclic
    • C07C215/08—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being saturated and acyclic with only one hydroxy group and one amino group bound to the carbon skeleton
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    • C07—ORGANIC CHEMISTRY
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    • C07C215/00—Compounds containing amino and hydroxy groups bound to the same carbon skeleton
    • C07C215/02—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton
    • C07C215/04—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being saturated
    • C07C215/06—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being saturated and acyclic
    • C07C215/12—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups and amino groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being saturated and acyclic the nitrogen atom of the amino group being further bound to hydrocarbon groups substituted by hydroxy groups
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    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
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    • C07F9/09—Esters of phosphoric acids
    • C07F9/11—Esters of phosphoric acids with hydroxyalkyl compounds without further substituents on alkyl
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification

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Abstract

The application discloses an ionic liquid-based humidity-controlling material for an air conditioner, which contains an ionic liquid containing oxygen ions shown in a general formula 1 and anions shown in a general formula 2, or an ionic liquid consisting of cations and anions shown in a general formula 3; the ionic liquid is synthesized by allowing trialkyl phosphate to act on 2-N, N-dimethylaminoethanol and gelatinizing the onium of the trialkyl phosphate. The ionic liquid has the characteristics of good hygroscopicity, no toxicity, less metal corrosiveness (particularly copper, stainless steel, aluminum and the like generally used in heat exchangers of air conditioners and the like) and no odor generation, and in the synthetic process of the ionic liquid, only 2-N, N-dimethylaminoethanol and trimethyl phosphate are mixed under the condition of no solvent, so that the reaction is very easy to carry out, and the ionic liquid can be very simply synthesized. Is suitable for use as a humidity control material for liquid air conditioners or absorption refrigerators.

Description

Ionic liquid-based humidity control material for air conditioner
Technical Field
The present invention relates to a humidity control material for air conditioners; in particular to a humidity adjusting material for an air conditioner based on ionic liquid.
Background
In the liquid air conditioner, a liquid humidity conditioning material having a characteristic of absorbing water vapor in the air is used. Document 11 discloses the operation principle of an air conditioner using an ionic liquid as a humidity control material (see fig. 1). The cooled ionic liquid (cold ionic liquid (dry)) is contacted with the outside air, the moisture of the outside air is absorbed by the ionic liquid, and the outside air is cooled. If the generated dry and cold air is introduced into the room, the cold air and the dehumidification in the room can be simultaneously realized (figure 1, left). The ion liquid (wet) having absorbed moisture is heated by the heat pump to become a thermal ion liquid (wet), and is exposed to the introduced outside air (or the warm air in the room), whereby the moisture is transferred to the outside air or the warm air in the room and discharged as wet warm air (fig. 1, right). The ion liquid (dry) with the decreased water content is cooled by a heat exchanger to become a cold ion liquid (dry), and the cycle is repeated to function as an air conditioner (fig. 1). In the apparatus of fig. 1, dry cooling air can be generated simultaneously with ventilation. Further, since the air can be humidified simultaneously in the heating chamber by using low-temperature waste heat during operation, it can be expected to function as a heating air conditioner that does not require a humidifier in winter (fig. 1). Therefore, the humidity control material for air conditioning of fig. 1 is required to have a property of absorbing water vapor as well as a property of absorbing water vapor only by contacting with a gas.
As liquid humidity control materials, patent documents 1 to 5 and non-patent documents disclose salts having a melting point of 100 ℃ or lower at normal pressure as humidity control materials. Documents 6 and 7 disclose liquid humidity control materials using an aqueous lithium chloride solution, an aqueous calcium chloride solution, triethylene glycol, or the like. Salts that exhibit melting points below 100 ℃ at atmospheric pressure are commonly referred to as ionic liquids. The ionic liquids disclosed in documents 6 to 10 and non-patent documents are a combination of bromide anions, tetrafluoroborate anions, imidazole stabilizing cations, and bis (trifluoromethylsulfonyl) amide ([ Tf2N ] and abbreviation).
Documents 6 to 7 disclose lithium chloride aqueous solutions and calcium chloride aqueous solutions as humidity control materials. These have high water vapor absorbability, and have a property of absorbing water vapor only by contacting with a gas, and can provide stable air with low humidity. However, generally, aqueous solutions of alkali or alkaline earth metals of halide ions are metal corrosive. Therefore, it is necessary to use expensive materials such as titanium having high corrosion resistance, for pipes, heat exchangers, and the like to which these moisture absorbents are in contact. The use of an ionic liquid as a humidity conditioning material is disclosed in patent documents 1 to 5 and documents 8 to 11. The ionic liquid has high water vapor absorbability and the property of absorbing water vapor only by contacting with gas, but bromide anions and tetrafluoroborate anions are used as anions for forming the ionic liquid. These anions are corrosive to metals and also have toxicity problems. The ionic liquid disclosed in document 11 has a phosphorus cation in the cation and a phosphoric acid anion in the anion. The ionic liquid has lower toxicity and lower metal corrosivity than the ionic liquids disclosed in patent documents 1 to 5 and 8 to 10, but it is preferably a safe ionic liquid that can be produced at low cost.
Technical scheme
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide an ionic liquid-based humidity-controlling material for an air conditioner, which has the characteristics of low toxicity, low metal corrosivity, low cost and the like, and meets the use requirements of the air conditioner.
In order to solve the technical problems, the invention adopts the technical scheme that:
a moisture absorbent of an ionic liquid containing an oxygen ion represented by the following formula 1 and an anion represented by the following formula 2:
general formula 1:
Figure BDA0002649179860000021
in the general formula 1, R1Represents an alkyl group of 1 to 6 carbon atoms in number, an alkenyl group of 2 to 6 carbon atoms in number, and represents two or moreA monovalent group in which the alkyl groups are bonded through one or more ether or thioether linkages; alkyl is straight chain alkyl or branched chain alkyl;
general formula 2:
Figure BDA0002649179860000022
in the general formula 2, R2And R3May be the same or different. R1 in the cation, R2 and R3 in the anion may be the same or different. R2, R3 may be a hydrogen atom, an alkyl group of 1 to 6 carbon atoms in carbon number, an alkenyl group of 2 to 6 carbon number, and a monovalent group representing two or more alkyl groups bonded through one or more ether or thioether bonds; alkyl is straight chain alkyl or branched alkyl. The alkyl group may have a silane group as a substituent.
Among the cations represented by the general formula 1, the cation in which R1 is a methyl group is choline, abbreviated as [ Ch ]. Since the cation is present in all living bodies, it is highly safe and can be produced at low cost. As the anion represented by the general formula 2, a methyl group or an ethyl group is known as R2 or R3, and the anion is preferable because it is inexpensive and highly safe.
An ionic liquid comprising a cation represented by the following general formula 3 and an anion is used as a moisture-absorbing material.
General formula 3:
Figure BDA0002649179860000031
in formula 3: r1、R2、R3Represents an alkyl group of 1 to 6 carbon atoms in carbon number, an alkenyl group of 2 to 6 carbon atoms in carbon number, and a monovalent group in which two or more alkyl groups are bonded through one or more ether bonds or thioether bonds; alkyl is straight chain alkyl or branched chain alkyl;
in the cation of formula 3, R1The cation as the methyl group is known under the name choline, and is preferably a cation. Anion R2And R3May be the same or different. And, R in the cation1R in the anion2And R3May be the same or different, but is preferablyOne of which is methyl or ethyl.
The salt used in the humidity control material may contain a single cation or may contain a plurality of cations; the same is true for the anion.
The moisture absorption material is applied to air conditioners.
The ionic liquid can be prepared by reacting trialkyl phosphate]Acting on 2-N, N-dimethylaminoethanol [2- (N, N-dimethyl) aminoethanol]And their oniums are synthesized. For example, N-trimethylethanolammonium phosphate dimethyl [ 2-hydroxyethyi-N, N, N-trimethylethanolammonium dimthylphosphahte][Ch][DMPO4](hereinafter abbreviated as ([ Ch)][DMPO4]) The reaction formula (1) of the synthesis is shown below.
Figure BDA0002649179860000041
In the synthesis process, 2-N, N-dimethylaminoethanol and trimethyl phosphate only need to be mixed under the condition of no solvent, the reaction is very easy to carry out, and therefore, the ionic liquid can be synthesized very simply. In addition, since no metal exchange reaction or anion exchange using an ion exchange resin is required, it is possible to prevent incorporation of halogen which causes corrosion of metals.
The humidity controlling material may contain one specific salt represented by the general formula, or may contain two or more different salts of R1, R2, and R3. The humidity-controlling material may contain other components generally used for humidity-controlling materials within a range not to impair the effects of the present invention.
The humidity conditioner may be an aqueous solution. In addition, the aqueous solution may contain other molecular liquids such as triethylene glycol and dimethylformamide. In this case, however, the specific salt contained must contain the salt represented by formula 3.
The humidity control material of the present embodiment can be applied to, for example, a desiccant type liquid air conditioner and an absorption refrigerator. The humidity control material can be used in either an open or closed system.
Has the advantages that: compared with the prior art, the application has the advantages that: the ionic liquid has the characteristics of good hygroscopicity, no toxicity and no odor generation, and is suitable for being used as a humidity conditioning material for a liquid air conditioner or an absorption refrigerating machine. In the synthesis process of the ionic liquid, the 2-N, N-dimethylaminoethanol and trimethyl phosphate are only required to be mixed without a solvent, the reaction is very easy to carry out, and therefore, the ionic liquid can be synthesized very simply. Further, since a metal exchange reaction is not required or anion exchange is performed using an ion exchange resin, it is possible to prevent incorporation of a halogen which causes metal corrosion, and to reduce metal corrosiveness (in particular, copper, stainless steel, aluminum, and the like which are generally used in heat exchangers such as air conditioners), and thus, the present invention can be applied to, for example, desiccant type liquid air conditioners and absorption refrigerators.
Drawings
FIG. 1 is a working schematic diagram of an ionic liquid air conditioner;
FIG. 2 is a diagram of a measurement device for balancing water vapor pressure;
FIG. 3 is a graph of the temperature variable viscosity results of [ Ch ] [ DMPO4] 80% aqueous solutions.
Detailed Description
The synthesis of the humidity control material ionic liquid will be described in more detail below with reference to examples and comparative examples. The present invention is not limited thereto.
Example 1
Synthesis of N, N, N-trimethylethanolammonium phosphate ([ Ch ] [ DMPO 4])
Expression: (CH)3)2(CH2)2OH+(CH3O)3PO→[Ch][DMPO4]
Figure BDA0002649179860000051
2.39mol of 2-N, N-dimethylaminoethanol [2(N, -N-dimethyl) aminoethanol at 0 DEG C]2.41mol of trimethyl phosphate [ trimethy phosphate ] was added with stirring]Stirring was carried out at 55 ℃ for 23h under an argon atmosphere. Cooling to room temperature, washing with diethyl ether for 3 times to remove unreacted substances, concentrating, and freezingDrying to obtain light brown solid [ Ch][DMPO4](yield 2.33mol, yield 97%). Dissolving the solid in 1000mL deionized water, adding 5.0g of active carbon, stirring at 55 ℃, filtering to obtain a colorless aqueous solution, concentrating under reduced pressure, and freeze-drying to obtain 2mol of white solid [ Ch [][DMPO]4The yield thereof was found to be 91%. Mp 57 ℃; 1H NMR (600MHz, CDCl 3): 3.37(9H, s), 3.59(3H, s), 3.60(3H, s), 3.79(2H, t, J ═ 4.5Hz), 4.09-4.12(2H, m); 13C NMR (150MHz, CDC 13): 52.46, 52.50, 54.41, 56.30, 68.15; IR: 3172, 2945, 2841, 1482, 1226, 1086, 1035, 952, 866, 782, 736, 527, 463 cm-1; HRMS (ESI) C5H14NO + 104.1076; found 104.1064; HRMS (ESI) calcd for C2H6O 4-125.0004; found 125.0001.
Example 2
Synthesis of 2-hydroxyethenyl-N- (2-hydroxyethenyl) -N, N-dimethylethanenitrilimethylphosphatihte ([ DEDMA ] [ DMPO 4).
Ch(DMPO)4For comparison of humidity control function, ionic liquid [ DEDMA ] was synthesized by adding 1 cation to hydroxyethyl group][DMPO]。
The reaction expression is as follows: c5H13NO2+(CH3O)3PO→[DEDMA][DMPO4]
Figure BDA0002649179860000061
30mmol of 2-hydroxyethyl-N-methylethanolamine [2- (N-methyl-N- (2-hydroxyethenyl) amino) ethanol]Adding 30mmol trimethyl phosphate at room temperature, sealing in a pressure-resistant glass tube, and stirring at 80 deg.C for 21 hr to obtain [ DMDEA ]][DMPO4](4.59g, yield 59%).
1HNMR(600MHz，CD3OD3)3.27(s，6H)，3.58(s，3H)，3.59(s，3H)，3.59-3.61(m，4H，J＝2.4Hz)，4.03-4.05(m，4H，J＝2.6Hz)，4.89(s，2H，OH)；13CNMR(150MHz，CD3OD3)52.99，53.13，56.95，67.99；IR(neat，cm-1)3169，2646，2843，1465，1218，1034，789.7，465cm-1；HRMS(ESI)m/z calculated for C6H16NO2+，134.1182；found 134.1168；HRMS(ESI)m/z calculated for C2H6O4P-，125.0004；found 125.0003。
Example 3
N，N-diethyl-N-methylethanaminium dimethylphospahte([N2221[DMPO4) And (4) synthesizing.
For comparison [ Ch][DMPO4]The simple quaternary ammonium salt ionic liquid [ N2221 ] is synthesized][DMPO4]。
The reaction formula is as follows: (C)2H5)3N+(CH3O)3PO→[N2221][DMPO4]
Figure BDA0002649179860000062
At room temperature, 30mmol of Triethylamine [ Triethylamine ] was added]30mmol of trimethyl phosphate are added thereto and stirred at 80 ℃ for 24 h. Cooling, washing with diethyl ether, concentrating under reduced pressure, and freeze drying to obtain target product [ N2221%][DMPO4](yield 5.64g, yield 78%). Mp 35 ℃; 1H NMR (600MHz, CDCl3)1.36(t, 9H, J ═ 7.2Hz), 3.21(s, 3H), 3.53-3.57(q, 6H, J ═ 7.6Hz), 3.57(s, 3H), 3.59(s, 3H); 13CNMR (150MHz, CDCl3)46.71, 52.21, 54.23, 54.27, 55.50; IR (neat)3026, 2981, 2942, 1452, 1248, 1040, 759, 473 cm-1; HRMS (ESI) m/z calcd for C7H18N +, 116.1440; found 116.1429; HRMS (ESI) m/z calcd for C2H6O4P-, 125.0004; found 125.0002.
Example 4
1g of the ionic liquid ([ Ch ] synthesized in example 1 was added][DMPO4]) Placing in a culture dish, and mixing with a hygrometer (T)&D corporation, illumination, ultraviolet, temperature and humidity data recorder TR-74Ui) were put together in a zipper-equipped plastic bag (Zipproc (R), 273 mm. times.268 mm, manufactured by Asahi Kasei-Industrie K.K.), and left to stand in a 30 ℃ thermostatic bath, and the change in humidity in the zipper-equipped plastic bag was measured until the humidity reached an equilibrium state. The difference in humidity at which the humidity reached an equilibrium state at the start of the experiment and the moisture absorption rate (%/mol) of 1 mole were measured.
The value obtained by dividing the moisture absorption rate per mole of the ionic liquid by the time (min) from the start of the test until the humidity in the zipper-equipped plastic bag reaches an intermediate value between the humidity at the start of the test and the humidity at equilibrium is defined as the moisture absorption rate (%/min × mol). The results are shown in Table 1.
Example 5
The ionic liquid ([ DEDMA) synthesized in example 2][DMPO4]) A petri dish was charged with 1g, and moisture absorption rate (%/mol) and moisture absorption rate (%/min. times. mol) were obtained by the method of example 4. The results are shown in Table 1.
Example 6
The ionic liquid ([ N2221) synthesized in example 3 above was added][DMPO4]) A petri dish was charged with 1g, and moisture absorption rate (%/mol) and moisture absorption rate (%/min. times. mol) were obtained by the method of example 4. The results are shown in Table 1.
Comparative example 1
Control experiments using lithium chloride. A petri dish was charged with 5g of an aqueous solution of lithium chloride having a concentration of 30 mass%, and the same test as in example 4 was performed. The results are shown in Table 1.
Comparative example 2
Using [ Ch][Tf2N]Control test of (2). 2-hydroxymethy 1-N, N, N-trimethylaminonium bis (hereinafter abbreviated as [ Ch ] amide) disclosed in the patent document][Tf2N])1g of the obtained solution was placed in a petri dish, and the same test as in example 4 was performed. The results are shown in Table 1.
The results of measuring the moisture absorption rate and the moisture absorption rate in examples 1 and 2 and 3 are shown in table 1. In addition, the salt other than the specific salt was LiCl 30% (w/w) aqueous solution as a control, [ DEDMA][DMPO4]，[N2221][DMPO4]，[Ch][Tf2N]I.e. [ Ch][Tf2N]Is an ionic liquid disclosed in patent document 1.
TABLE 1 moisture absorption Rate and speed of Ionic liquids
Humidity regulator Moisture absorption (%/mol) Moisture absorption Rate (%/min, mol)
Example 1 [Ch][DMPO4] 3295 747
Example 2 [DEDMA][DMPO4] 2649 306
Example 3 [N2221][DMPO4] 2484 282
Comparative example 1 30% LiCl aqueous solution 725 191
Comparative example 2 [Ch][Tf2N] 4510 7.6
As shown in Table 1, [ Ch ]][DMPO4]Compared with lithium chloride, the compound is shown to beHigh moisture absorption rate and high moisture absorption speed. Although the moisture absorption rate was lower than that of the choline salt [ Ch ] in comparative example 2][Tf2N]However, the moisture absorption rate is 100 times or more. This indicates that the absorption and discharge of water vapor proceeded smoothly. In addition, the hydroxyethyl group of example 2 binds to the cation [ DEDMA ]][DMPO4]Compared with pure 4-grade ammonium salt ionic liquid ([ N2221 ]][DMPO4]) In contrast, the moisture absorption rate and the moisture absorption rate all showed good values.
Example 7
In the liquid type air conditioner, it is not sufficient to have a high moisture absorption performance alone, and the operation efficiency of the air conditioner depends on the equilibrium vapor pressure, and it is preferable that the equilibrium vapor pressure is 15hPa or less at 30 ℃. Therefore, using the apparatus shown in FIG. 2, equilibrium water vapor pressure at 25 ℃ and 35 ℃ and 55 ℃ was measured for an aqueous solution of 80% (w/w), 50% (w/w) and 25% (w/w) of each ionic liquid (FIG. 2).
The aqueous solution of the ionic liquid and pure water were put in a bottle, and after adding a stirrer, the bottle was put in an oil bath. The 2 flasks were brought to the same temperature with stirring. After the pressure was reduced to a certain value, the connection with the vacuum pump was closed by a tee, followed by heating and measuring the pressure in the equilibrium state at each temperature. The measurement results are shown in Table 2.
TABLE 2 vapor pressure (hPa) of equilibrium state of each ionic liquid aqueous solution
Moisture-absorbing material 25℃ 35℃ 55℃
Example 1 [Ch][DMPO4]30wt％ 11 22 85a
Example 2 [Ch(DMPO)4]50wt％ 6.6 15 69
Example 3 [Ch(DMPO)4]80wt％ 5.8 12 33
Comparative example 1 [DMDEA][DMPO4]30wt％ 13 34 170
Comparative example 2 [DMDEA][DMPO4]50wt％ 12 23 170
Comparative example 3 [DMDEA][DMPO4]80wt％ 10 18 62
Comparative example 4 [N2221][DMPO4]30wt％ 14 30 190
Comparative example 5 [N2221][DMPO4]50wt％ 15 24 170
Comparative example 6 [N2221][DMPO4]80wt％ 11 22 150
Comparative example 7 LiCl 30wt％ 9.6 20 161a
Equilibrium water vapor pressure at a50 deg.C
[Ch][DMPO4]Even in a 50% aqueous solution, the sample showed good results of 15hPa at 35 ℃ and 10hPa at 30 ℃ (Table 2, example 2). On the other hand, increased in hydroxyethyl group [ DMDEA ]][DMPO4]Of (1) 18hPa at 35 ℃ even in an 80 wt% aqueous solution (Table 2, comparative example 3), [ N2221[ DMPO ]4]The 80% aqueous solution of (2) was also 22hPa at 35 deg.C (Table 2, comparative example 6). In the ionic liquid tested [ Ch][DMPO4]Performs best at equilibrium water vapor pressures (table 2, examples 2, 3).
Example 8 Metal solubility test
For use in a liquid type dehumidifier, it is required that metals used in a heat exchanger and piping of the dehumidifier have as low corrosiveness as possible. This example also performed a metal corrosion test. As the metal pieces used for the metal solubility test, hot-rolled mild steel plates (SPHC: hereinafter abbreviated as "Zn-Fe"), stainless steel plates (SUS 304: hereinafter abbreviated as "SUS"), hard-pitch copper plates (C1100P: hereinafter abbreviated as "Cu"), and corrosion-resistant aluminum plates (A5052: hereinafter abbreviated as "Al") were used.
The 4 kinds of metal pieces described above, molten zinc-aluminum-magnesium alloy plated steel sheet SPHC (abbreviated as Zn — Fe), hard asphalt bronze (abbreviated as Cu), corrosion-resistant aluminum a5052 (abbreviated as Al), and stainless steel SUS304 (abbreviated as SUS) were put into sample tubes each containing an 80% ionic liquid aqueous solution and sealed. While stirring the solution, care was taken not to bring the metal pieces (10 mm. times.15 mm. times.2 mm) into contact with the stirrer. After 48h at 80 ℃, the samples were removed, washed with deionized water, dried under reduced pressure, weighed accurately and the weight loss calculated. As a control, experiments were also conducted under the same conditions with a 30% LiCl aqueous solution used as a humidity control material in a conventional desiccant air conditioner. The metal corrosion was evaluated by the change in weight of the metal plate before and after the experiment (table 3).
TABLE 3 Corrosion test results
Figure BDA0002649179860000101
In the case of LiCl (30% aqueous solution), all the metal pieces are significantly reduced in weight, and especially the dissolution of zinc steel sheet (Zn — Fe) and copper is more significant. Solutions of aluminum (a1) and stainless steel (SUS) which are not so much reduced in weight are also colored. Further, [ N2221][DMPO4]The weight of copper (Cu) in the aqueous solution of (a) is greatly reduced. [ Ch][DMPO4]80% (w/w) aqueous solution and [ DMDEA ]][DMPO4]80% (w/w) is slightly corrosive to copper, but with LiC1 (30% aqueous solution) and [ N2221 ]][DMPO4]Comparison of aqueous solutionsThe amount of decrease was slight, and the zinc-coated steel sheet (Zn-Fe), aluminum (Al) and stainless steel (SUS) were not reduced in weight and had low corrosion.
[ Ch ] was measured using a cone-plate viscometer (DV 2TCP, manufactured by Yinzhong Kogyo Co., Ltd.)][DMPO4]Viscosity of 80% aqueous solution. The results are shown in FIG. 3, [ Ch ]][DMPO4]The viscosity of the 80% aqueous solution is slightly higher, and the viscosity is 64cP at 35 ℃. However, since the 75% aqueous solution is 28cP and the equilibrium water vapor pressure at 30 ℃ is 15hPa or less at this concentration, it is considered that there is no problem in practical use. If it is desired to further reduce the viscosity in practical use, the viscosity can be reduced by adding some kind of auxiliary solvent such as N, N-Dimethylformamide (DMF) or Dimethylsulfoxide (DMSO).
The analysis of malodors was based on human olfactory senses. [ Ch][DMPO4]80% (w/w) aqueous solution and [ DMDEA ]][DMPO4]80% (w/w) aqueous solution, [ N2221][DMPO4]The 80% aqueous solution was stable at room temperature, and no odor was detected even when the solution was left at room temperature for 2 weeks.
Reference documents:
[1] japanese patent publication No. 2014-505586: inventors, ストルク, マールテン; patent No. no, no; the dehydration method する is used in the patent name of イオン, liquid permeability コリン, salt を; authorization time, not requested.
[2]Japanese patent publication No. 2016 & 052614: the inventor, biao side, gao shi jie he shang you loose , preferably ラ - マン · ヴェ - ダラージャングプタ · スラビカミヤ · ジヤイン, patent No. kyo 6059187; the patent name: water vapor emanation material, and knitted fabric and LCST
Figure BDA0002649179860000111
A reduction assay method; authorization time, 2006.01
[3] Japanese patent publication No. 2017-154076: the inventor, the ferry vacuum prays to and looks loose preferably ラ ー マン · ヴェ ー ダ ラ ー ジ ヤ ン プ ラ チ · プラティーチ; patent No. no, no; the patent name, water vapor emanation material; authorization time, not requested.
[4] Japanese patent publication No. 2017-221940: the inventor, オリヴイエ & ツェーナッカーべンャミン & ヴィリー Wangxinning ロルフ & シュナイダー; patent No. no, no; patent name, wet ったガス mix を dehumidification すゐ process; authorization time, not requested.
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[6]L.Mei，Y.I.Dai，A technical review on use of liquid-desiccant dehumidification for air-conditioning application，Renewable and Sustainable Energy Reviews，2008，12，662-689
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Claims (9)

1. A moisture absorbent of an ionic liquid containing an oxygen ion represented by the following formula 1 and an anion represented by the following formula 2:
general formula 1:
Figure FDA0002649179850000011
in the general formula 1, R1Represents an alkyl group of 1 to 6 carbon atoms in carbon number, an alkenyl group of 2 to 6 carbon atoms in carbon number, and a monovalent group in which two or more alkyl groups are bonded through one or more ether bonds or thioether bonds;
alkyl is straight chain alkyl or branched chain alkyl;
general formula 2:
Figure FDA0002649179850000012
in the general formula 2, R2And R3Each represents a hydrogen atom, an alkyl carbon of 1 to 6 carbon atoms, an alkenyl group of 2 to 6 carbon atoms, and a monovalent group in which two or more alkyl groups are bonded through one or more ether bonds or thioether bonds; alkyl is straight chain alkyl or branched alkyl.
2. A moisture absorbent as claimed in claim 1, wherein: r2And R3The alkyl group is represented by having a silane group as a substituent.
3. A moisture absorbent containing an ionic liquid comprising a cation represented by the following general formula 3 and an anion.
General formula 3:
Figure FDA0002649179850000013
in formula 3: r1、R2、R3Represents an alkyl group of 1 to 6 carbon atoms in carbon number, an alkenyl group of 2 to 6 carbon atoms in carbon number, and a monovalent group in which two or more alkyl groups are bonded through one or more ether bonds or thioether bonds; alkyl is straight chain alkyl or branched alkyl.
4. A moisture absorbent as claimed in claim 3, wherein: r2And R3The alkyl group is represented by having a silane group as a substituent.
5. A process for the preparation of an ionic liquid according to claim 1 or 2, characterized in that: synthesized by allowing trialkyl phosphate to act on 2-N, N-dimethylaminoethanol and gelatinizing the onium of the trialkyl phosphate; the synthetic reaction formula (1) is shown below:
Figure FDA0002649179850000021
6. use of the moisture absorbent of claim 1 or 2 in air conditioning.
7. Use according to claim 6, characterized in that: the air conditioner is a desiccant liquid air conditioner or an absorption refrigerator.
8. Use of an ionic liquid according to claim 1 or 2 for absorbing moisture.
9. Use according to claim 8, characterized in that: humidity regulators used in the application are water, triethylene glycol and dimethylformamide.
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