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WO2020255680A1 - Fibre échangeuse d'ions et filtre échangeur d'ions la contenant - Google Patents

Fibre échangeuse d'ions et filtre échangeur d'ions la contenant Download PDF

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Publication number
WO2020255680A1
WO2020255680A1 PCT/JP2020/021509 JP2020021509W WO2020255680A1 WO 2020255680 A1 WO2020255680 A1 WO 2020255680A1 JP 2020021509 W JP2020021509 W JP 2020021509W WO 2020255680 A1 WO2020255680 A1 WO 2020255680A1
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Prior art keywords
ion exchange
exchange
ion
fiber
filter
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Ceased
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PCT/JP2020/021509
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English (en)
Japanese (ja)
Inventor
丹後佑斗
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Japan Exlan Co Ltd
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Japan Exlan Co Ltd
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Priority to CN202080043688.5A priority Critical patent/CN114007743B/zh
Priority to JP2021527531A priority patent/JP7441429B2/ja
Publication of WO2020255680A1 publication Critical patent/WO2020255680A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J39/00—Cation exchange; Use of material as cation exchangers; Treatment of material for improving the cation exchange properties
    • B01J39/08—Use of material as cation exchangers; Treatment of material for improving the cation exchange properties
    • B01J39/16—Organic material
    • B01J39/18—Macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J39/00—Cation exchange; Use of material as cation exchangers; Treatment of material for improving the cation exchange properties
    • B01J39/04—Processes using organic exchangers
    • B01J39/07—Processes using organic exchangers in the weakly acidic form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J47/00—Ion-exchange processes in general; Apparatus therefor
    • B01J47/12—Ion-exchange processes in general; Apparatus therefor characterised by the use of ion-exchange material in the form of ribbons, filaments, fibres or sheets, e.g. membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J47/00—Ion-exchange processes in general; Apparatus therefor
    • B01J47/12—Ion-exchange processes in general; Apparatus therefor characterised by the use of ion-exchange material in the form of ribbons, filaments, fibres or sheets, e.g. membranes
    • B01J47/127—Ion-exchange processes in general; Apparatus therefor characterised by the use of ion-exchange material in the form of ribbons, filaments, fibres or sheets, e.g. membranes in the form of filaments or fibres
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/20—Manufacture of shaped structures of ion-exchange resins
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds

Definitions

  • the present invention relates to an ion exchange fiber and an ion exchange filter containing the fiber, and more specifically, to an ion exchange filter made of a non-woven fabric or a papermaking sheet.
  • the strongly acidic cation exchange resins listed above are known to mainly have a sulfonic acid group. Since the ion exchange resin is relatively inexpensive and has a neutral salt resolution, it is used for purifying water to remove Na ions and the like in water (for example, Patent Document 1).
  • Chelate resins are known to have various functional groups, and in particular, those having iminodiacetic acid groups and polyamine groups are known. These functional groups are used for recovering valuable metals such as Cu and Ni existing in water (for example, Patent Document 2).
  • the weakly acidic cation exchange resin mainly has a carboxyl group.
  • the ion exchange resin is used for softening applications such as removing Ca and Mg ions in water by utilizing its features of ease of regeneration and high ion exchange capacity (for example, Patent Document 3).
  • the strongly acidic cation exchange resin having a sulfonic acid group has a strong bond with the metal ion, and it is necessary to use a large amount of acid for regeneration. was there.
  • there is a difficulty in the selectivity of adsorbed ions and there is a drawback that Cu, Ni, Pb and the like can hardly be adsorbed in an aqueous solution containing a hardness component such as Ca.
  • the chelate resin has good selectivity for heavy metals and can be said to be an ion exchange resin specialized for recovery and removal of heavy metals.
  • the ion exchange capacity is small and a large amount of chelate is required to obtain an effect in actual use. I had to use resin.
  • the weakly acidic cation exchange resin having a carboxyl group has better selectivity than the strongly acidic cation exchange resin having a sulfonic acid group, and can adsorb trace heavy metal ions in hard water, but has a particle shape. Since there is a limit to miniaturization in order to secure the flow path, the specific surface area cannot be increased. For this reason, the flow of heavy metal ions increases under high flow velocity, and water treatment at low flow velocity is unavoidable.
  • the present invention has been devised in view of the current state of the prior art, and an object of the present invention is to provide an ion exchanger having good selectivity for heavy metals, a high ion exchange capacity, and suppressed flow through. Is to provide.
  • the present inventors used acrylic fiber having a fine fineness as a starting material and formed a high-density carboxyl group by hydrolysis to form a high-density carboxyl group against heavy metals.
  • acrylic fiber having a fine fineness as a starting material and formed a high-density carboxyl group by hydrolysis to form a high-density carboxyl group against heavy metals.
  • ion exchange fiber having good selectivity, a high ion exchange capacity, and suppressed flow through can be obtained, and have reached the present invention.
  • the present invention is achieved by the following means.
  • the amount of carboxyl groups is 7.0 to 11.0 mmol / g, the degree of water swelling is 0.5 to 1.5 g / g, and the fineness is 1.0 to 3.0 dtex.
  • An ion exchange filter made of a mixture of 30% by mass of ion exchange fibers and 70% by mass of heat-sealed fibers and having a density of 0.33 g / cm 3 was wound and then heat-bonded to prepare an ion exchange filter.
  • the filter is attached to the filter housing, and an aqueous solution having a Cu (copper) concentration of 3 ppm and a Ca (calcium) concentration of 12 ppm and adjusted to pH 6 to 7 with sodium hydroxide is passed through SV500 [hr -1 ] every 30 minutes. Measure the Cu concentration [ppm] of the filtered water. From the obtained measurement results, the flow-through exchange capacity (C [eq]) when the flow-through point is 1.0 ppm and the total exchange capacity (C0 [eq]) of the ion exchange filter are calculated, and the flow-through exchange is performed by the following equation. Calculate the capacity ratio.
  • Flow exchange capacity ratio [%] 100 x C / C0 (2)
  • An ion exchange filter comprising the thread, non-woven fabric or papermaking sheet according to (5) or (6).
  • the ion exchange fiber of the present invention employs a carboxyl group as an ion exchange group, trace heavy metal ions in hard water can be removed and recovered. Further, the fiber has a large amount of carboxyl groups, and has an extremely high specific surface area because of its fiber shape and fineness. Therefore, the fiber has a high probability of contact between the functional group and water when it is formed into a filter shape and passed through water, and heavy metal ions can be efficiently recovered and removed even under a high flow velocity. Further, when the ion exchange fiber of the present invention adopts a calcium salt or magnesium salt type carboxyl group, the degree of water swelling can be further lowered, so that when the mixing ratio when molding into a filter is designed to be high, Can also reduce pressure loss.
  • the ion exchange fiber of the present invention having such performance can be used as, for example, a filter for industrial wastewater treatment containing heavy metals, which can cope with a high flow velocity.
  • the ion exchange fiber of the present invention has a carboxyl group as an ion exchange group, and the amount of carboxyl thereof is 7.0 to 11.0 mmol / g, preferably 7.5 to 10.5 mmol / g, more preferably 7.5 to 10.5 mmol / g. Is 8.0 to 10.0 mmol / g.
  • the amount of carboxyl groups is measured by a method described later, and in the present invention, per 1 g of fibers of H-type carboxyl groups when various salt-type carboxyl groups are converted to H-type by acid. Indicates the amount.
  • the amount of the carboxyl group When the amount of the carboxyl group is less than 7.0 mmol / g, the total ion exchange capacity of the ion exchange filter containing the fiber decreases. If the amount of the carboxyl group exceeds 11.0 mmol / g, the durability of the fiber is remarkably lowered, and the yield at the time of producing the ion exchange filter is deteriorated.
  • the amount of the carboxyl group can be controlled by adjusting the amount of the alkali metal compound used at the time of hydrolysis, which will be described later.
  • the carboxyl group contained in the ion exchange fiber of the present invention preferably has a structure salt-formed with calcium or magnesium. Since these are multivalent metal ions, they have the effect of forming an ionic bond between two carboxyl groups and reducing the degree of water swelling. On the other hand, when the carboxyl group is salt-formed with an alkali metal such as sodium or potassium, for example, the water permeability of the filter deteriorates and the pressure loss increases, which is not preferable.
  • the ion exchange fiber of the present invention has a water swelling degree of 0.5 to 1.5 g / g, particularly preferably 0.8 to 1.2 g / g, as measured by a method described later. If the degree of water swelling exceeds 1.5 g / g, the water permeability of the ion exchange filter is lowered and pressure loss occurs, which is not preferable. Further, when the water swelling degree is less than 0.5 g / g, it is expected that almost no carboxyl group is introduced in the first place, and there is a possibility that the ion exchange performance cannot be exhibited.
  • the degree of water swelling can be controlled by ionic bonding with the above-mentioned multivalent metal ions or by adjusting the amount of the cross-linking agent at the time of the cross-linking treatment in the production method described later.
  • the ion exchange fiber of the present invention has a fineness of 1.0 to 3.0 dtex, particularly preferably 1.5 to 2.8 dtex.
  • the fineness exceeds 3.0 dtex, the contact probability between the carboxyl group and the heavy metal ion in water decreases due to the decrease in the specific surface area of the fiber, which may impair the ion exchange performance, which is not preferable.
  • the fineness is less than 1.0 dtex, sufficient fiber strength cannot be maintained and the yield at the time of producing an ion exchange filter may deteriorate, which is not preferable.
  • the ion exchange fiber of the present invention has a once-through exchange capacity ratio of 40% or more, preferably 50% or more, as measured by the method described in Examples described later.
  • the once-through exchange capacity refers to the exchange capacity until a certain concentration of leaked ions in the treated water (such a concentration is referred to as a once-through point) is reached when water is continuously passed. After passing the once-through point, ion exchange becomes insufficient and the number of leaked ions increases. Therefore, even if the total exchange capacity is not reached, the purpose such as ion removal cannot be achieved and the ion cannot be used substantially.
  • the once-through exchange capacity ratio is the ratio of the once-through exchange capacity to the total exchange capacity, and is an index showing the speed of the ion exchange rate.
  • the ion exchange rate gradually decreases as the ion exchange of the ion exchange group progresses.
  • the ion exchange rate does not match the flow velocity of the treatment liquid, and the ion exchange cannot be completed, reaching the once-through point. Therefore, the faster the initial ion exchange rate, the later the time to reach the once-through point, and the larger the once-through exchange capacity ratio.
  • the once-through exchange capacity ratio is less than 40%, the ion exchange rate of the ion exchange fiber is low and the heavy metal removal performance is significantly lowered. Therefore, it is used under high flow velocity conditions or by a so-called one-pass in which the treatment liquid is passed only once. Not suitable for use.
  • the flow-through exchange capacity ratio can also be adjusted by the fineness of the ion exchange fiber, and fineness is effective for improving the flow-through exchange capacity ratio.
  • the ion exchange filter in the present invention is a filter made by winding a thread, a non-woven fabric or a papermaking sheet made of a mixture containing ion exchange fibers, or a laminated non-woven fabric or a papermaking sheet and punching it into an arbitrary shape. Examples include, but are not limited to these.
  • the yarn used for producing the ion exchange filter in the present invention is not particularly limited, but is known such that the above-mentioned ion exchange fiber is mixed with other fibers, carded, and then spun as a sliver. Examples include threads obtained by the method.
  • the non-woven fabric for producing the ion exchange filter in the present invention is not particularly limited, but for example, the above-mentioned ion exchange fiber and other fibers are mixed and passed through a device such as a card machine a plurality of times to make a needle punch machine. , Non-woven fabric adjusted to an arbitrary density by passing through a calendar machine and the like can be mentioned.
  • the papermaking sheet for producing the ion exchange filter in the present invention is not particularly limited, but a slurry in which the above-mentioned mixture of ion exchange fibers and other fibers is uniformly dispersed using a beater, a refiner, or the like is produced. Then, the paper is made and then dried.
  • the other fibers in the above-mentioned yarn, non-woven fabric, and papermaking sheet are not particularly limited, and examples thereof include general-purpose fibers such as polyester and rayon, heat-sealing fibers, activated carbon fibers, and chelate fibers.
  • the heat-fused fiber contributes to the improvement of moldability, and the fineness is preferably about 2 to 4 dtex, which is close to the ion exchange fiber to be mixed.
  • Specific examples of such heat-sealed fibers include fibers having a core-sheath structure formed of polyethylene and polypropylene, polyester and polyethylene, polyester and low-melting point polyester, and the like.
  • the content of the ion exchange fiber of the present invention is preferably more than 20% by mass, more preferably 25% by mass or more. If the content of the ion exchange fiber is less than the above lower limit, sufficient ion exchange performance may not be obtained.
  • ion exchange filter of the present invention includes a harmful heavy metal removal filter, a valuable metal recovery filter, a water purification filter and the like.
  • an acrylic fiber having a fine fineness is used as a starting material, a crosslinked structure is formed in the fiber, and a carboxyl group is formed in the fiber at a high density by hydrolysis.
  • a method of forming a calcium salt type carboxyl group or a magnesium salt type carboxyl group by treating with a nitrate, sulfate, hydrochloride or the like of calcium or magnesium can be mentioned. The method will be described below.
  • the acrylic fiber used as a raw material is produced from an acrylonitrile-based polymer according to a known method, and the composition of the polymer is preferably 40% by mass or more of acrylonitrile, more preferably. It is 50% by mass or more, more preferably 80% by mass or more.
  • the fineness of the acrylic fiber may be any fineness such that the fineness of the finally obtained ion exchange fiber is 1.0 to 3.0 dtex, but usually, it is preferably 2.0 dtex or less. , More preferably 1.0 dtex or less. Since the fineness tends to increase due to the cross-linking treatment and the hydrolysis treatment described later, it is necessary to use an acrylic fiber having a finer fineness than the target fineness of the ion exchange fiber.
  • a crosslinked structure is introduced into the acrylic fiber as described above.
  • a cross-linking agent such as a nitrogen-containing compound is preferably used for introducing the cross-linked structure.
  • the nitrogen-containing compound it is preferable to use an amino compound having two or more primary amino groups or a hydrazine-based compound.
  • a hydrolysis treatment with an alkali metal compound is performed to convert the nitrile group into a carboxyl group.
  • the above-mentioned cross-linking treatment and hydrolysis treatment may be performed individually or at the same time. However, the conditions for each process differ depending on whether they are performed individually or at the same time.
  • the conditions for the cross-linking treatment when the cross-linking treatment and the hydrolysis treatment are individually performed are not limited as long as the ion-exchanged fibers of the present invention can be obtained.
  • the hydrazine concentration is 10.
  • examples thereof include a method of immersing the above-mentioned acrylic fibers in an aqueous solution to which the above-mentioned hydrazine-based compound is added so as to have a concentration of about 18% by mass, and treating the mixture at 100 to 130 ° C. for 2 to 10 hours.
  • Examples of the hydrolysis treatment conditions after the cross-linking treatment include a method of treating in an aqueous solution of a treatment agent containing 5 to 10% by mass of an alkali metal compound at a temperature of 100 to 130 ° C. for 2 to 10 hours.
  • the conditions for simultaneously performing the cross-linking treatment and the hydrolysis treatment are not particularly limited, but the amount of carboxyl groups required for the ion exchange fiber of the present invention is the same as the treatment conditions for each cross-linking hydrolysis described above. Select in consideration of such factors. In addition, it is possible to proceed with the reaction by reducing the amount of the drug as compared with the case of performing separately.
  • the acrylic fiber described above is immersed in an aqueous solution containing 0.5 to 4% by weight of a hydrazine compound as a cross-linking agent and 1 to 6% by weight of sodium hydroxide as an alkali metal compound, and the temperature is 100 to 130 ° C., 2 to 10%. Examples include a method of processing in time.
  • the carboxyl group after the hydrolysis treatment is the alkali metal used in the hydrolysis treatment as a counter ion.
  • conversion to calcium salt type carboxyl group or magnesium salt type carboxyl group can be performed.
  • the specific treatment conditions are not particularly limited, but the temperature is 30 in an aqueous solution of a treatment agent containing 0.5 to 1.0 molar equivalents of calcium ions and magnesium ions with respect to the amount of the introduced carboxyl groups. Examples thereof include a method of treating at ⁇ 100 ° C. for 0.5 to 3 hours.
  • the ion exchange fiber of the present invention described above has a high carboxyl group amount, a large specific surface area, and a low water swelling degree, it has highly efficient ion exchange performance that could not be realized in the past. Therefore, the ion exchange filter using the ion exchange fiber of the present invention has a high exchange capacity like the conventional weakly acidic cation exchange resin and strongly acidic cation exchange resin, and Cu under high flow velocity conditions. It has become possible to remove heavy metal ions such as.
  • ⁇ Measurement method of water swelling degree> Approximately 1 g of a fully dried sample is precisely weighed (W2 [g]) and immersed in 200 ml of distilled water for 30 minutes. Then, dehydrate at 160 G (G indicates gravitational acceleration) for 5 minutes using a centrifugal dehydrator (TYPE KS-8000 manufactured by Kubota Co., Ltd.). The mass after dehydration is precisely weighed (W3 [g]), and the degree of water swelling is calculated by the following formula. Water swelling degree [g / g] (W3-W2) / W2
  • Ion-exchange fiber sample (carboxyl group amount A1 [mmol / g]) and heat-sealed fiber (Unitika Melty 4080 fineness 2.2 dtex) are uniformly mixed using a roller card machine manufactured by KYOWA Machinery at a mass ratio of 3: 7.
  • the mixture is passed through a needle punching machine and a calendar machine, and unnecessary parts are cut to obtain a non-woven fabric (length 100 cm, width 15 cm) having a thickness of 0.3 mm and a grain ratio of 100 g / m 2 .
  • the initial concentration of Cu and the permeation point in the above measurement method were set based on the NSF International Standard / American Standard (NSF / ANSI 53-2009) for drinking water treatment equipment.
  • ⁇ Measurement method of Pb concentration of filtered water A chromatographic column with a cock having an inner diameter of 4 cm is filled with 0.1 g of a sample, and 5 g of glass beads are placed therein. A test solution adjusted to a Pb concentration of 0.14 mg / l using lead nitrate was passed through the test solution at a flow rate of 25 ml / min up to a water flow rate of 4500 ml, and the concentration of the filtered water per hour was adjusted to "54. Measure by a method based on "4 ICP mass spectrometry".
  • the raw material fibers were subjected to a treatment of simultaneously introducing cross-linking and hydrolysis at 115 ° C. for 3 hours in an aqueous solution containing 1.5% by mass of sodium hydroxide and 1.0% by mass of hydrated hydrazine, and washed with water. Then, it was treated with 8 mass% nitric acid aqueous solution at 120 degreeC for 3 hours, and was washed with water. Next, the obtained fiber was immersed in water, sodium hydroxide was added to adjust the pH to 9, and then the temperature was 70 ° C. in an aqueous solution in which calcium nitrate equivalent to 1.5 times the amount of carboxyl groups contained in the fiber was dissolved.
  • FIG. 3 shows a graph showing the relationship between the Cu concentration and the water flow rate ratio used for calculating the once-through exchange capacity ratio.
  • the evaluation result of the Pb concentration in the filtered water is shown in FIG.
  • the horizontal axis of FIG. 4 represents the water flow time in terms of the water flow amount.
  • Example 2 Using the same raw material fiber as that used in Example 1, a cross-linking introduction treatment was performed at 115 ° C. for 2 hours in an aqueous solution containing 15% by mass of hydrated hydrazine, and the fiber was washed with water. Next, hydrolysis treatment was performed at 120 ° C. for 2 hours in an aqueous solution containing 10% by mass of sodium hydroxide. Washed with water. Further, it was treated with a 6 mass% nitric acid aqueous solution at 110 ° C. for 3 hours and washed with water. Next, the hydrolysis treatment was performed again at 120 ° C.
  • FIG. 3 shows a graph showing the relationship between the Cu concentration and the water flow rate ratio used for calculating the once-through exchange capacity ratio.
  • Example 2 showed almost the same tendency as that of Example 1.
  • the ion exchange fiber of Example 1 since the ion exchange fiber of Example 1 has a fineness and a large specific surface area, hardness components and other ions coexist, and even in a situation where the flow velocity is very high, Pb and the like can be used. Heavy metals can be removed efficiently.
  • the ion exchange resin of Comparative Example 1 leakage of 0.02 ppm or more of Pb was observed from an early stage, and it was found that it was not suitable for water treatment at a high flow velocity.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

L'invention concerne des résines échangeuses de cations fortement acides, des résines de chélate, des résines échangeuses de cations faiblement acides, etc. ayant traditionnellement été utilisées pour éliminer des ions métalliques présents dans des solutions aqueuses. Cependant, il existe des problèmes dans la mesure où les résines échangeuses de cations fortement acides nécessitent de grandes quantités d'acides pour la régénération et ont une faible sélectivité pour les ions adsorbés, les résines de chélate ont une bonne sélectivité mais une faible capacité d'échange d'ions, et les résines échangeuses de cations faiblement acides ont une sélectivité relativement bonne mais souffrent d'une percée élevée d'ions de métaux lourds dans des débits élevés. La présente invention a pour but de fournir un échangeur d'ions ayant une bonne sélectivité pour les métaux lourds, une capacité d'échange d'ions élevée et une percée supprimée.　La présente invention concerne une fibre échangeuse d'ions caractérisée en ce qu'elle présente une quantité de groupes carboxyle de 7,0 à 11,0 mmol/g, un degré de gonflement à l'eau de 0,5 à 1,5 g/g, une finesse de 1,0 à 3,0 dtex, et un rapport de capacité d'échange de percée d'au moins 40 %.
PCT/JP2020/021509 2019-06-20 2020-06-01 Fibre échangeuse d'ions et filtre échangeur d'ions la contenant Ceased WO2020255680A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080043688.5A CN114007743B (zh) 2019-06-20 2020-06-01 离子交换纤维和含有该纤维的离子交换过滤器
JP2021527531A JP7441429B2 (ja) 2019-06-20 2020-06-01 イオン交換繊維および該繊維を含有するイオン交換フィルター

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JP2019-114809 2019-06-20

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