WO2024147228A1 - 芳香族ポリアミド系逆浸透膜の洗浄剤、洗浄液及び洗浄方法 - Google Patents
芳香族ポリアミド系逆浸透膜の洗浄剤、洗浄液及び洗浄方法 Download PDFInfo
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- WO2024147228A1 WO2024147228A1 PCT/JP2023/040384 JP2023040384W WO2024147228A1 WO 2024147228 A1 WO2024147228 A1 WO 2024147228A1 JP 2023040384 W JP2023040384 W JP 2023040384W WO 2024147228 A1 WO2024147228 A1 WO 2024147228A1
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- cleaning
- aromatic polyamide
- reverse osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
- B01D65/06—Membrane cleaning or sterilisation ; Membrane regeneration with special washing compositions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/10—Accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/56—Polyamides, e.g. polyester-amides
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/08—Silicates
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/24—Organic compounds containing halogen
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/26—Organic compounds containing nitrogen
- C11D3/30—Amines; Substituted amines ; Quaternized amines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Definitions
- the present invention relates to a cleaning agent, cleaning solution, and cleaning method for aromatic polyamide reverse osmosis membranes used in the water treatment field. More specifically, the present invention relates to a cleaning agent for effectively recovering the performance of an aromatic polyamide reverse osmosis membrane when the membrane performance such as permeation flux and rejection rate is reduced due to contamination of the membrane, a cleaning solution containing the cleaning agent, and a cleaning method for aromatic polyamide reverse osmosis membranes using the cleaning solution.
- RO reverse osmosis
- Patent Document 1 describes a cleaning agent for an alkali-resistant aromatic polyamide RO membrane, which is an aqueous solution having a pH of 13 or more and which contains a chloramine compound, a non-amine surfactant such as an alkylbenzene sulfonate, and an alkaline agent.
- Paragraph 0051 of Patent Document 1 states that a chelating agent such as EDTA may be further added to enhance the effect of removing membrane contaminants.
- Patent Document 2 describes a cleaning agent for aromatic polyamide RO membranes that is an aqueous solution with a pH of 13 or higher that contains a chloramine compound, a chelating agent such as an aliphatic carboxylic acid that does not contain an amino group, such as oxalic acid, a non-amine surfactant such as an alkylbenzene sulfonate, and an alkaline agent.
- a chelating agent such as an aliphatic carboxylic acid that does not contain an amino group, such as oxalic acid
- a non-amine surfactant such as an alkylbenzene sulfonate
- an alkaline agent such as an alkylbenzene sulfonate
- Patent Document 2 the decrease in the concentration of chloramine compounds is suppressed, and contaminants in aromatic polyamide RO membranes are effectively removed.
- the present invention aims to provide a cleaning agent, cleaning solution, and cleaning method that can effectively remove contaminants by suppressing the decrease in stabilized halogen concentration even more than in Patent Document 2 when an aromatic polyamide RO membrane is contaminated and performance such as permeation flux and salt rejection rate decreases.
- the gist of the present invention is as follows:
- a cleaning agent for aromatic polyamide reverse osmosis membranes consisting of an aqueous solution containing a stabilized halogen and a silicate compound.
- a cleaning agent for aromatic polyamide-based reverse osmosis membranes according to [1] or [2], in which the stabilizing halogen contains monochlorosulfamic acid.
- a cleaning agent for aromatic polyamide reverse osmosis membranes according to any one of [1] to [4], which contains a non-amine anionic surfactant having no amino group or amine oxide in its molecular structure with a molecular weight of less than 1,000.
- a cleaning solution for aromatic polyamide reverse osmosis membranes comprising a diluted aqueous solution of a cleaning agent for aromatic polyamide reverse osmosis membranes described in any one of [1] to [7].
- a cleaning solution for aromatic polyamide reverse osmosis membranes according to [8] or [9], in which the concentration of the stabilizing halogen in the cleaning solution is 0.001 to 0.02 M and the concentration of the silicate compound is 0.0001 to 0.0005 M.
- a method for cleaning an aromatic polyamide reverse osmosis membrane comprising a step of contacting the aromatic polyamide reverse osmosis membrane with the cleaning solution described in any one of [8] to [10].
- 1 is a graph showing the results of an example and a comparative example. 1 is a graph showing the results of an example and a comparative example. 1 is a graph showing the results of an example and a comparative example. 1 is a graph showing the results of an example and a comparative example.
- the stabilized halogen used as the halogen-based cleaning agent component can be generated by mixing any one of a compound having a primary amino group, ammonia, and an ammonium salt (hereinafter, these are referred to as " NH2 -based compounds") with a halogen-based oxidizing agent such as a chlorine-based oxidizing agent or a bromine-based oxidizing agent.
- a halogen-based oxidizing agent such as a chlorine-based oxidizing agent or a bromine-based oxidizing agent.
- hypochlorous acid and/or hypochlorite are preferably used.
- bromine-based oxidizing agent bromine (liquid bromine), bromine chloride, bromic acid, bromate, hypobromous acid, etc. are exemplified.
- a chloramine compound is preferable, that is, a compound (XNHCl) in which the hydrogen atom of the amino group is replaced with a chlorine atom, which is obtained by reacting hypochlorous acid (HOCl) with a compound (XNH2) having a primary amino group in the reaction shown in the following reaction formulas (1) and ( 2 ).
- This compound has a weak oxidizing effect on the membrane, so that it can be used as a cleaning agent even for aromatic polyamide-based RO membranes with low chlorine resistance.
- sulfamic acid ( NH2SO2OH ) is preferred.
- NH2SO2OH a stable chloramine compound. Since sulfamic acid does not contain carbon, it does not increase the TOC value of the cleaning agent.
- the amount of hypochlorous acid and/or hypochlorite is the amount of chloramine compounds in the cleaning agent.
- silicic acid compound As the silicic acid compound (silicic acid salt), one or more of metasilicic acids such as sodium metasilicate, potassium metasilicate, lithium metasilicate, calcium metasilicate, magnesium metasilicate, orthosilicates such as sodium orthosilicate, and pyrosilicates such as sodium pyrosilicate are suitable, and among these, sodium metasilicate is preferred.
- metasilicic acids such as sodium metasilicate, potassium metasilicate, lithium metasilicate, calcium metasilicate, magnesium metasilicate, orthosilicates such as sodium orthosilicate, and pyrosilicate are suitable, and among these, sodium metasilicate is preferred.
- the pH of the cleaning agent of the present invention is usually 13 or higher due to the presence of the silicic acid compound.
- the concentration of the stabilizing halogen in the cleaning agent is 0.1 to 2 M
- the concentration of the silicic acid compound is 0.01 to 0.05 M
- the concentration of the non-amine surfactant is preferably 0.5 M or less, for example, 0.002 to 0.5 M.
- the cleaning solution of the present invention is an aqueous solution obtained by diluting the cleaning agent with water. If the pH of the cleaning solution is less than 11, the permeation flux cannot be sufficiently restored. The higher the pH of the cleaning solution, the better the cleaning effect. However, if the pH is too high, the cleaning solution becomes difficult to handle and there is a high risk of deterioration of the permeable membrane such as the RO membrane.
- the pH of the cleaning solution is preferably 11 or more and 13 or less.
- the concentration of the non-amine anionic surfactant in the cleaning solution is preferably 0.005M or less, and more preferably 0.0002 to 0.005M.
- the cleaning solution of the present invention is produced by diluting the thus produced cleaning agent of the present invention with water, preferably pure water.
- water preferably pure water.
- the cleaning solution of the present invention can also be produced directly by the same method as above, without going through the cleaning agent of the present invention.
- the method for cleaning an aromatic polyamide reverse osmosis membrane with the cleaning solution of the present invention is not particularly limited, and the aromatic polyamide reverse osmosis membrane may be brought into contact with the cleaning solution.
- immersion cleaning is performed by introducing the cleaning solution into the raw water side of the permeable membrane module and leaving it to stand.
- membrane cleaning with another cleaning solution may be performed before or after cleaning the aromatic polyamide reverse osmosis membrane according to the present invention.
- cleaning with an alkaline aqueous solution that does not contain chloramine compounds or silicate compounds may be performed before or after cleaning the aromatic polyamide reverse osmosis membrane with the cleaning solution of the present invention.
- acid cleaning which is effective for removing scale and metal colloids, may be performed.
- an RO membrane (Filmtec SW30) contaminated with organic matter recovered from a wastewater treatment plant was placed in a container filled with a cleaning solution, and the cleaning solution in the container was circulated by a pump connected to the container at 35°C. 0.9 L of cleaning solution was used for 0.165 m2 of contaminated membrane area.
- the pH and total chlorine (DPD method) of the cleaning solution were measured at regular intervals, and the total chlorine consumption was calculated.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Detergent Compositions (AREA)
Abstract
Description
本発明は、芳香族ポリアミド系逆浸透膜(ナノ濾過(NF)膜を含む)を洗浄対象とする。
本発明において、ハロゲン系洗浄剤成分として用いる安定化ハロゲンは、1級アミノ基を有する化合物、アンモニア、及びアンモニウム塩のいずれか(以下、これらを「NH2系化合物」と称す。)と、塩素系酸化剤や臭素系酸化剤などのハロゲン系酸化剤とを混合することにより生成させることができる。塩素系酸化剤としては次亜塩素酸及び/又は次亜塩素酸塩を使用することが好ましい。また、臭素系酸化剤としては臭素(液体臭素)、塩化臭素、臭素酸、臭素酸塩、次亜臭素酸等が挙げられる。安定化ハロゲンとしてはクロラミン化合物、すなわち、以下の反応式(1),(2)に示すような反応で次亜塩素酸(HOCl)と1級アミノ基を有する化合物(XNH2)とを反応させて得られる、アミノ基の水素原子が塩素原子に置換した化合物(XNHCl)が好ましい。この化合物は、膜に対する酸化作用が弱いため、塩素耐性の低い芳香族ポリアミド系RO膜であっても洗浄剤として用いることが可能となる。
XNH2+OCl-⇔XNHCl+OH- (2)
アンモニウム塩としては、塩化アンモニウム、硫酸アンモニウム等が挙げられる。これらは、1種を単独で用いてもよく、2種以上を混合して用いてもよい。
本発明の洗浄剤はアミノ基及びアミンオキシドを分子構造中に含まない非アミン系アニオン系界面活性剤を含んでもよい。非アミン系アニオン系界面活性剤としては、洗浄効果の面から、分子量1000以下の非アミン系アニオン系界面活性剤が好ましい。分子量が過度に大きい非アミン系界面活性剤では洗浄効果が得られないだけでなく、膜を汚染する場合がある。
ケイ酸化合物(ケイ酸塩)としては、メタケイ酸ナトリウム、メタケイ酸カリウム、メタケイ酸リチウム、メタケイ酸カルシウム、メタケイ酸マグネシウム等のメタケイ酸塩、オルトケイ酸ナトリウム等のオルトケイ酸塩、ピロケイ酸ナトリウム等のピロケイ酸塩などの1種又は2種以上が好適であり、中でもメタケイ酸ナトリウムが好適である。
本発明の洗浄剤のpHは、ケイ酸化合物の存在により、通常は13以上となっている。洗浄剤中の安定化ハロゲン濃度は0.1~2Mであり、ケイ酸化合物濃度は0.01~0.05Mであり、非アミン系界面活性剤濃度は0.5M以下,例えば0.002~0.5Mであることが好ましい。
本発明の洗浄液は、この洗浄剤を水で希釈した水溶液よりなる。この洗浄液のpHが11未満であると、透過流束を十分に回復させることができない。洗浄液のpHは高い方が洗浄効果に優れるが、高過ぎると、洗浄液としての取り扱い性が悪くなり、RO膜等の透過膜が劣化する危険性が高くなる。洗浄液のpHは好ましくは11以上13以下である。
本発明の洗浄剤に用いられる安定化ハロゲンは、モノクロロスルファミン酸等であり、スルファミン酸等のNH2系化合物の水溶液に、次亜塩素酸及び/又は次亜塩素酸塩を添加して混合することにより調製することができる。上記水溶液は、水の量を50~90重量%とすることが好ましい。ケイ酸化合物及び非アミン系アニオン系界面活性剤は、洗浄剤の調製工程で添加されてもよく、安定化ハロゲンの水溶液に添加されてもよい。
本発明で用いる洗浄剤又は洗浄液には、その洗浄効果を損なわない範囲において、他の洗浄剤成分を添加してもよい。例えば、本発明の洗浄剤又は洗浄液は、アルカリ剤を含んでいてもよい。アルカリ剤は、水酸化ナトリウム、水酸化カリウム等のアルカリ金属の水酸化物であってよい。これらは1種を単独で用いてもよく、2種以上を混合して用いてもよい。
本発明の洗浄液を用い芳香族ポリアミド系逆浸透膜を洗浄する方法としては、この洗浄液に芳香族ポリアミド系逆浸透膜を接触させればよく、特に制限はない。通常、透過膜モジュールの原水側に洗浄液を導入して静置する浸漬洗浄が行われる。
以下に実施例及び比較例を挙げて本発明をより具体的に説明する。
洗浄液として、表1の成分を含むpH12の水酸化ナトリウム水溶液を用いた。
本出願は、2023年1月6日付で出願された日本特許出願2023-001215に基づいており、その全体が引用により援用される。
Claims (11)
- 安定化ハロゲンと、ケイ酸化合物とを含む水溶液よりなる、芳香族ポリアミド系逆浸透膜の洗浄剤。
- 前記洗浄剤中の安定化ハロゲンの濃度が0.1~2Mであり、前記ケイ酸化合物の濃度が0.01~0.05Mである請求項1の芳香族ポリアミド系逆浸透膜の洗浄剤。
- 前記安定化ハロゲンがモノクロロスルファミン酸を含む請求項1の芳香族ポリアミド系逆浸透膜の洗浄剤。
- 前記ケイ酸化合物がケイ酸ナトリウムおよびケイ酸カリウムの少なくとも一方である請求項1の芳香族ポリアミド系逆浸透膜の洗浄剤。
- 分子量1000未満のアミノ基およびアミンオキシドを分子構造中に有しない非アミン系アニオン系界面活性剤を含む請求項1の芳香族ポリアミド系逆浸透膜の洗浄剤。
- 前記水溶液中の前記非アミン系アニオン系界面活性剤の濃度が0.002~0.5Mである請求項5の芳香族ポリアミド系逆浸透膜の洗浄剤。
- 前記安定化ハロゲンが、1級アミノ基を有する化合物、アンモニア及びアンモニウム塩よりなる群から選ばれる1種又は2種以上と、次亜塩素酸及び/又は次亜塩素酸塩との反応物である請求項1の芳香族ポリアミド系逆浸透膜の洗浄剤。
- 請求項1ないし7のいずれか1項に記載の芳香族ポリアミド系逆浸透膜の洗浄剤の希釈水溶液よりなる、芳香族ポリアミド系逆浸透膜の洗浄液。
- 前記洗浄液のpHが11~13である請求項8の芳香族ポリアミド系逆浸透膜の洗浄液。
- 前記洗浄液の安定化ハロゲンの濃度が0.001~0.02Mであり、ケイ酸化合物の濃度が0.0001~0.0005Mである請求項8の芳香族ポリアミド系逆浸透膜の洗浄液。
- 請求項8に記載の洗浄液に芳香族ポリアミド系逆浸透膜を接触させる工程を有する、芳香族ポリアミド系逆浸透膜の洗浄方法。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202380090566.5A CN120456974A (zh) | 2023-01-06 | 2023-11-09 | 芳香族聚酰胺系逆渗透膜的清洗剂、清洗液和清洗方法 |
| KR1020257015651A KR20250133867A (ko) | 2023-01-06 | 2023-11-09 | 방향족 폴리아미드계 역침투막의 세정제, 세정액 및 세정 방법 |
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| JP2023001215A JP7552743B2 (ja) | 2023-01-06 | 2023-01-06 | 芳香族ポリアミド系逆浸透膜の洗浄剤、洗浄液及び洗浄方法 |
| JP2023-001215 | 2023-01-06 |
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| WO2024147228A1 true WO2024147228A1 (ja) | 2024-07-11 |
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| CN (1) | CN120456974A (ja) |
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| KR102271325B1 (ko) * | 2020-12-28 | 2021-06-29 | 방혜숙 | 역삼투막의 미생물 장해 처리를 위한 할로겐설파메이트의 제조방법 및 그 이용 |
| CN113856477A (zh) * | 2021-09-15 | 2021-12-31 | 福州科煌生态环保科技有限公司 | 一种用于dtro膜的碱性清洗剂 |
| JP7136385B1 (ja) * | 2021-09-29 | 2022-09-13 | 栗田工業株式会社 | 芳香族ポリアミド系逆浸透膜の洗浄剤、洗浄液及び洗浄方法 |
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| JP6364751B2 (ja) | 2013-11-19 | 2018-08-01 | 栗田工業株式会社 | 芳香族ポリアミド系逆浸透膜の洗浄剤及び洗浄方法 |
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- 2023-01-06 JP JP2023001215A patent/JP7552743B2/ja active Active
- 2023-11-09 CN CN202380090566.5A patent/CN120456974A/zh active Pending
- 2023-11-09 KR KR1020257015651A patent/KR20250133867A/ko active Pending
- 2023-11-09 WO PCT/JP2023/040384 patent/WO2024147228A1/ja not_active Ceased
- 2023-11-21 TW TW112145006A patent/TW202428344A/zh unknown
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| KR102271325B1 (ko) * | 2020-12-28 | 2021-06-29 | 방혜숙 | 역삼투막의 미생물 장해 처리를 위한 할로겐설파메이트의 제조방법 및 그 이용 |
| CN113856477A (zh) * | 2021-09-15 | 2021-12-31 | 福州科煌生态环保科技有限公司 | 一种用于dtro膜的碱性清洗剂 |
| JP7136385B1 (ja) * | 2021-09-29 | 2022-09-13 | 栗田工業株式会社 | 芳香族ポリアミド系逆浸透膜の洗浄剤、洗浄液及び洗浄方法 |
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| KR20250133867A (ko) | 2025-09-09 |
| TW202428344A (zh) | 2024-07-16 |
| JP7552743B2 (ja) | 2024-09-18 |
| CN120456974A (zh) | 2025-08-08 |
| JP2024097627A (ja) | 2024-07-19 |
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