EA025200B1 - Preventing or reducing scale in wet-process phosphoric acid production - Google Patents

Preventing or reducing scale in wet-process phosphoric acid production Download PDF

Info

Publication number
EA025200B1
EA025200B1 EA201391360A EA201391360A EA025200B1 EA 025200 B1 EA025200 B1 EA 025200B1 EA 201391360 A EA201391360 A EA 201391360A EA 201391360 A EA201391360 A EA 201391360A EA 025200 B1 EA025200 B1 EA 025200B1
Authority
EA
Eurasian Patent Office
Prior art keywords
acid
preceding paragraphs
phosphoric acid
mixture
stage
Prior art date
Application number
EA201391360A
Other languages
Russian (ru)
Other versions
EA201391360A1 (en
Inventor
Сатханджхери Равишанкар
Бин Ван
Original Assignee
Сайтек Текнолоджи Корп.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Сайтек Текнолоджи Корп. filed Critical Сайтек Текнолоджи Корп.
Publication of EA201391360A1 publication Critical patent/EA201391360A1/en
Publication of EA025200B1 publication Critical patent/EA025200B1/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/16Oxyacids of phosphorus; Salts thereof
    • C01B25/18Phosphoric acid
    • C01B25/22Preparation by reacting phosphate-containing material with an acid, e.g. wet process
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F14/00Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes
    • C23F14/02Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes by chemical means

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Detergent Compositions (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Fuel Cell (AREA)
  • Silicon Compounds (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Removal Of Specific Substances (AREA)

Abstract

Methods for preventing or reducing the formation of scale in a wet-process phosphoric acid production process by intermixing a scale inhibiting reagent at one or more step of the phosphoric acid production process in an amount sufficient to prevent or reduce scale.

Description

(57) Способы предотвращения или снижения образования накипи в экстракционном процессе производства фосфорной кислоты примешиванием реагента, ингибирующего накипь, на одной или более стадиях процесса производства фосфорной кислоты в количестве, достаточном для предотвращения или снижения накипи.(57) Methods for preventing or reducing scale formation in an extraction process for the production of phosphoric acid by admixing a scale inhibiting reagent in one or more stages of a process for the production of phosphoric acid in an amount sufficient to prevent or reduce scale.

025200 Β1025200 Β1

Claims (20)

1. Способ снижения или предотвращения образования накипи в экстракционном процессе производства фосфорной кислоты, включающий подачу по меньшей мере на одной стадии экстракционного процесса производства фосфорной кислоты ингибирующего образование накипи реагента в эффективном количестве, обеспечивающем ингибирование образования накипи, выбранного из группы, включающей:1. A method of reducing or preventing scale formation in an extraction process for the production of phosphoric acid, comprising supplying at least one stage of the extraction process for the production of phosphoric acid, an scale inhibiting reagent in an effective amount, providing inhibition of scale formation selected from the group including: ί) полисахарид, содержащий функциональную группу сульфата, сульфоновой кислоты или карбоновой кислоты;ί) a polysaccharide containing a functional group of sulfate, sulfonic acid or carboxylic acid; ϊϊ) полимер или сополимер, имеющий фазовый переход при нижней критической температуре растворения (НКТР) от 30 до 100°С, где указанный полимер или сополимер выбран из группы, включающей сополимеры этиленгликоля-пропиленгликоля-этиленгликоля; поли-(н-изопропил-акриламид) и сополимеры акриловой кислоты и н-изопропил-акриламида); и их смесей;ϊϊ) a polymer or copolymer having a phase transition at a lower critical dissolution temperature (NCTR) of 30 to 100 ° C, wherein said polymer or copolymer is selected from the group consisting of ethylene glycol-propylene glycol-ethylene glycol copolymers; poly- (n-isopropyl-acrylamide) and copolymers of acrylic acid and n-isopropyl-acrylamide); and mixtures thereof; ίίί) реагент, содержащий смесь органической кислоты, полиамина и сахарной кислоты; ίν) смеси указанных групп соединений (ί)-(ίίί).ίίί) a reagent containing a mixture of an organic acid, polyamine and sugar acid; ίν) mixtures of the indicated groups of compounds (ί) - (ίίί). 2. Способ по п.1, где виды ингибируемой накипи представляют собой одно или более веществ из группы, включающей δί2Ρ6; Ν;·ι28ίΡ6; Κ2δίΡ6; Са§1р6-2Н2О; СаР2; МдР2; Са8О4-2Н2О; Мд§1р6-6Н2О; Μ§0,8Λ1ι,5Ρ6·Χ Н2О, где X является целым числом в интервале от 2 до 10; МдН2Р6О7; Са8О4; А1(РО3)3; ΝιΚΌΌ.; Όι;(Ά1ΙΌ;·4Ι ΙΌ; ΜμΝιΆΌΌΙ ΙΌ и (αΌΌΆΙδιΙΌ· 101 ΙΌ.2. The method according to claim 1, where the types of inhibitible scale are one or more substances from the group including δί 2 Ρ 6 ; Ν; · ι 2 8ίΡ 6 ; Κ 2 δίΡ 6 ; Ca§ 1 p 6 -2H 2 O; CaP 2 ; Mdr 2 ; Ca8O 4 -2H 2 O; Md§1r 6 -6H 2 O; Μ§ 0 , 8 Λ1ι, 5 Ρ 6 · Χ H 2 O, where X is an integer in the range from 2 to 10; MdN 2 P 6 O 7 ; Ca8O 4 ; A1 (PO 3 ) 3 ; ΝιΚΌΌ .; Όι ; (Ά1ΙΌ; 4Ι ΙΌ; ΜμΝιΆΌΌΙ ΙΌ and (αΌΌΆΙδιΙΌ · 101 ΙΌ. 3. Способ по п.1 или 2, где стадии добавления осуществляют на одной или более стадиях экстракционного процесса производства фосфорной кислоты, выбранных из группы, включающей стадию измельчения; стадию варки; стадию фильтрации; стадию конденсации/выпаривания и стадию очистки.3. The method according to claim 1 or 2, where the stage of adding is carried out at one or more stages of the extraction process for the production of phosphoric acid selected from the group including the stage of grinding; cooking stage; stage of filtration; a condensation / evaporation step; and a purification step. 4. Способ по любому из представленных выше пунктов, где стадии добавления осуществляют в любом междоузельном трубопроводе процесса производства фосфорной кислоты.4. The method according to any one of the above paragraphs, where the stage of the addition is carried out in any interstitial pipeline of the phosphoric acid production process. 5. Способ по любому из предыдущих пунктов, где стадию добавления осуществляют на одном этапе, на множестве этапов, последовательно, в обратном порядке, одновременно или в сочетании указанного.5. The method according to any one of the preceding paragraphs, where the step of adding is carried out in one step, in many stages, sequentially, in reverse order, simultaneously or in combination of the specified. 6. Способ по любому из предыдущих пунктов, где реагент, ингибирующий образование накипи, добавляют в виде единственного компонента или в виде отдельных компонентов.6. The method according to any one of the preceding paragraphs, wherein the scale inhibiting reagent is added as a single component or as separate components. 7. Способ по любому из предыдущих пунктов, где полисахарид выбирают из группы, включающей каррагинан; альгиновую кислоту и карбоксиметилцеллюлозу.7. The method according to any one of the preceding paragraphs, where the polysaccharide is selected from the group comprising carrageenan; alginic acid and carboxymethyl cellulose. 8. Способ по п.7, где карбоксиметилцеллюлоза имеет молекулярную массу от 2 до 100 кДа.8. The method according to claim 7, where the carboxymethyl cellulose has a molecular weight of from 2 to 100 kDa. 9. Способ по п.8, где молекулярная масса составляет от 10 до 75 кДа.9. The method of claim 8, where the molecular weight is from 10 to 75 kDa. 10. Способ по п.8 или 9, где молекулярная масса составляет от 10 до 30 кДа.10. The method of claim 8 or 9, where the molecular weight is from 10 to 30 kDa. 11. Способ по любому из предыдущих пунктов, где отношение мономера акриловой кислоты к мономеру н-изопропил-акриламида составляет от 20:80 до 80:20 по массе.11. The method according to any one of the preceding paragraphs, where the ratio of the acrylic acid monomer to the n-isopropyl acrylamide monomer is from 20:80 to 80:20 by weight. 12. Способ по п.11, где отношение мономера акриловой кислоты к мономеру н-изопропилакриламида составляет 50:50 по массе.12. The method according to claim 11, where the ratio of the acrylic acid monomer to the n-isopropyl acrylamide monomer is 50:50 by weight. 13. Способ по любому из предыдущих пунктов, где органической кислотой в смеси реагентов является производное фосфоновой кислоты, выбранное из группы, включающей фенилфосфоновую кислоту; фосфоноуксусную кислоту; гидроксиэтиламино-ди(метиленфосфоновую кислоту) (ГЭМФА); аминотри(метиленфосфоновую кислоту) (АТМФК); 1-гидроксиэтилиден-1,1-дифосфоновую кислоту (ГЭДФК); диэтилентриамин-пента(метиленфосфоновую кислоту) (ДТПМФ); этилендиаминметиленфосфоновую кислоту (ЭДТМФ); гидроксилэтанфосфонотилуксусную кислоту (НПАК) и фосфонобутан-1,2,4-трикарбоновую кислоту (ФБТКК).13. The method according to any one of the preceding paragraphs, where the organic acid in the mixture of reagents is a phosphonic acid derivative selected from the group comprising phenylphosphonic acid; phosphonoacetic acid; hydroxyethylamino di (methylenephosphonic acid) (GEMFA); aminotri (methylenephosphonic acid) (ATMP); 1-hydroxyethylidene-1,1-diphosphonic acid (HEDPA); diethylene triamine penta (methylenephosphonic acid) (DTPMF); ethylene diamine methylene phosphonic acid (EDTMF); hydroxyethanephosphonothylacetic acid (NPAC) and phosphonobutane-1,2,4-tricarboxylic acid (PBTC). 14. Способ по любому из предыдущих пунктов, где полиамином в смеси реагентов является хлорид полидиаллилдиметиламмония или полидиметиламин эпихлоргидрин этилендиамин.14. The method according to any one of the preceding paragraphs, where the polyamine in the mixture of reagents is polydiallyldimethylammonium chloride or polydimethylamine epichlorohydrin ethylenediamine. 15. Способ по любому из предыдущих пунктов, где сахарная кислота в смеси реагентов выбрана из группы, включающей глицериновую кислоту; ксилоновую кислоту; глюконовую кислоту; аскорбиновую кислоту; нейраминовую кислоту; кетодезоксиоктулозоновую кислоту; галактуроновую кислоту; идуроновую кислоту; винную кислоту; слизевую кислоту; сахарную кислоту и их смеси.15. The method according to any one of the preceding paragraphs, where the sugar acid in the mixture of reagents is selected from the group comprising glyceric acid; xylonic acid; gluconic acid; ascorbic acid; neuraminic acid; ketodesoxy octulosonic acid; galacturonic acid; iduronic acid; tartaric acid; mucous acid; sugar acid and mixtures thereof. - 14 025200- 14,025,200 16. Способ по любому из предыдущих пунктов, где смесь реагентов содержит 1-гидроксиэтилиден1,1-дифосфоновую кислоту (ГЭДФК) в качестве органической ксилоты, хлорид полидиаллилдиметиламмония в качестве полиамина и глюконовую кислоту в качестве сахарной кислоты.16. The method according to any one of the preceding paragraphs, where the mixture of reagents contains 1-hydroxyethylidene1,1-diphosphonic acid (HEDPA) as organic xylitol, polydiallyldimethylammonium chloride as polyamine and gluconic acid as sugar acid. 17. Способ по любому из пп.13-16, где отношение компонентов в смеси составляет 1:1:1 по массе.17. The method according to any one of paragraphs.13-16, where the ratio of the components in the mixture is 1: 1: 1 by weight. 18. Способ по любому из представленных выше пунктов, где реагент добавляют в концентрации, составляющей от 10 до 5000 г/т фосфорной кислоты.18. The method according to any one of the above paragraphs, where the reagent is added at a concentration of 10 to 5000 g / t phosphoric acid. 19. Способ по п.18, где реагент добавляют в концентрации, составляющей от 10 до 1000 г/т фосфорной кислоты.19. The method according to p, where the reagent is added at a concentration of 10 to 1000 g / t phosphoric acid. 20. Способ по п.18 или 19, где реагент добавляют в концентрации, составляющей 100 г/т фосфорной кислоты.20. The method according to p. 18 or 19, where the reagent is added at a concentration of 100 g / t of phosphoric acid.
EA201391360A 2011-03-22 2011-03-22 Preventing or reducing scale in wet-process phosphoric acid production EA025200B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2011/029319 WO2012128755A1 (en) 2011-03-22 2011-03-22 Preventing or reducing scale in wet-process phosphoric acid production

Publications (2)

Publication Number Publication Date
EA201391360A1 EA201391360A1 (en) 2014-01-30
EA025200B1 true EA025200B1 (en) 2016-11-30

Family

ID=44279691

Family Applications (1)

Application Number Title Priority Date Filing Date
EA201391360A EA025200B1 (en) 2011-03-22 2011-03-22 Preventing or reducing scale in wet-process phosphoric acid production

Country Status (12)

Country Link
EP (1) EP2688837A1 (en)
CN (1) CN103429528B (en)
AP (1) AP2013007112A0 (en)
AU (1) AU2011363047A1 (en)
BR (1) BR112013024257A2 (en)
CA (1) CA2830875A1 (en)
EA (1) EA025200B1 (en)
IL (1) IL228352A0 (en)
MA (1) MA35044B1 (en)
MX (1) MX358775B (en)
TN (1) TN2013000369A1 (en)
WO (1) WO2012128755A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9242863B2 (en) 2009-09-25 2016-01-26 Cytec Technology Corp. Process and reagents for the inhibition or reduction of scale formation during phosphoric acid production
EA201891738A1 (en) * 2014-02-11 2019-01-31 Сайтек Индастриз Инк. POLYMERS CONTAINING PRIMARY AMIN, SUITABLE AS BAKING EDGE INHIBITORS
BR112017017209B1 (en) 2015-02-11 2023-02-14 Cytec Industries Inc PROCESS TO INHIBIT FOLDING
EA026955B1 (en) * 2015-03-16 2017-06-30 Общество с ограниченной ответственностью "ФАРМА-ПОКРОВ" Disinfecting composition
EP3504300A1 (en) 2016-08-25 2019-07-03 General Electric Company Reduced fouling of hydrocarbon oil
CN107043094A (en) * 2017-04-18 2017-08-15 云南佳贝节能科技有限公司 A kind of system of processing of concentrated phosphoric acid
US10759662B2 (en) 2018-03-12 2020-09-01 Solenis Technologies, L.P. Systems and methods for reducing formation of scale in phosphoric acid production
CN111215247B (en) * 2020-01-07 2021-04-23 中南大学 Inhibitor for high-calcium fluorite direct flotation and flotation method
CN112919650B (en) * 2021-01-21 2023-05-02 山东滨州昱诚化工科技有限公司 Scale and corrosion inhibitor, composition for scale and corrosion inhibitor, and preparation method and application of composition

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1433123A (en) * 1972-05-05 1976-04-22 Fisons Ltd Process for inhibiting scale
US4049774A (en) * 1970-11-12 1977-09-20 Fisons Limited Process for reducing formation of gypsum scale durng the washing of calcium sulphate hemihydrate crystals
US4221769A (en) * 1972-11-08 1980-09-09 Fisons Limited Process for preventing the formation of calcium sulphate scale
US4327061A (en) * 1979-02-21 1982-04-27 Kerr-Mcgee Chemical Corporation Method of stabilizing wet process phosphoric acid for solvent extraction
US5120519A (en) * 1991-11-04 1992-06-09 Nalco Chemical Company Scale control in phosphoric acid manufacture
CN1762857A (en) * 2005-08-31 2006-04-26 刘天暘 Scale inhibitor for wet method phosphoric acid manufacture
WO2011038108A1 (en) * 2009-09-25 2011-03-31 Cytec Technology Corp. Process and reagents for the inhibition or reduction of scale formation during phosphoric acid production
WO2011038167A1 (en) * 2009-09-25 2011-03-31 Cytec Technology Corp. Preventing or reducing scale in wet-process phosphoric acid production

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3039187C2 (en) 1980-10-17 1982-12-23 Hoechst Ag, 6000 Frankfurt Use of smoothed pipes and apparatus parts
CA1337323C (en) 1986-12-08 1995-10-17 Zahid Amjad Treatment of aqueous medium with copolymers containing acrylamidoalkane sulfonic acid
CN1082515A (en) * 1992-09-30 1994-02-23 河南省南阳高新节能技术有限公司 Natural plant and mineral type boiler scale cleaning agent
EP0677485A1 (en) 1994-03-22 1995-10-18 Faborga S.A. Means for preventing deposit formation in industrial process waters
JP2002263690A (en) 2001-03-07 2002-09-17 Kurita Water Ind Ltd Preventing agent against deposition of scale and method for preventing deposition of scale
US6572789B1 (en) * 2001-04-02 2003-06-03 Ondeo Nalco Company Corrosion inhibitors for aqueous systems
GB2424876B (en) 2005-04-06 2011-03-23 Rhodia Uk Ltd Improved analysis of polymeric scale inhibitors
US7727945B2 (en) * 2005-07-15 2010-06-01 Akzo Nobel N.V. Modified polysaccharides
US7666963B2 (en) * 2005-07-21 2010-02-23 Akzo Nobel N.V. Hybrid copolymers
US8674021B2 (en) * 2006-07-21 2014-03-18 Akzo Nobel N.V. Sulfonated graft copolymers
CN101565242B (en) * 2008-04-23 2011-09-07 北京合创同盛科技有限公司 Compound synergic water treating agent
CN101759302A (en) * 2009-11-17 2010-06-30 瓮福(集团)有限责任公司 Method for preventing scaling in pipeline of phosphoric acid production equipment

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4049774A (en) * 1970-11-12 1977-09-20 Fisons Limited Process for reducing formation of gypsum scale durng the washing of calcium sulphate hemihydrate crystals
GB1433123A (en) * 1972-05-05 1976-04-22 Fisons Ltd Process for inhibiting scale
US4221769A (en) * 1972-11-08 1980-09-09 Fisons Limited Process for preventing the formation of calcium sulphate scale
US4327061A (en) * 1979-02-21 1982-04-27 Kerr-Mcgee Chemical Corporation Method of stabilizing wet process phosphoric acid for solvent extraction
US5120519A (en) * 1991-11-04 1992-06-09 Nalco Chemical Company Scale control in phosphoric acid manufacture
CN1762857A (en) * 2005-08-31 2006-04-26 刘天暘 Scale inhibitor for wet method phosphoric acid manufacture
WO2011038108A1 (en) * 2009-09-25 2011-03-31 Cytec Technology Corp. Process and reagents for the inhibition or reduction of scale formation during phosphoric acid production
WO2011038167A1 (en) * 2009-09-25 2011-03-31 Cytec Technology Corp. Preventing or reducing scale in wet-process phosphoric acid production

Also Published As

Publication number Publication date
EA201391360A1 (en) 2014-01-30
MX2013010468A (en) 2013-10-28
MX358775B (en) 2018-09-04
CN103429528A (en) 2013-12-04
AP2013007112A0 (en) 2013-09-30
MA35044B1 (en) 2014-04-03
BR112013024257A2 (en) 2016-12-27
CA2830875A1 (en) 2012-09-27
CN103429528B (en) 2016-08-10
TN2013000369A1 (en) 2015-01-20
EP2688837A1 (en) 2014-01-29
IL228352A0 (en) 2013-12-31
AU2011363047A1 (en) 2013-09-26
WO2012128755A1 (en) 2012-09-27

Similar Documents

Publication Publication Date Title
EA025200B1 (en) Preventing or reducing scale in wet-process phosphoric acid production
US9403707B2 (en) Pentaerythritol core, phosphonic acid terminated dendrimer and its preparation method
RU2010117970A (en) APPLICATION OF POLYOLS AS REAGENTS FOR CONTROL OF FORMATION OF DEPOSITS IN METHODS OF MINING
JP2010500158A5 (en)
CN102399018B (en) Reverse osmosis membrane scale inhibitor and application thereof
Chen et al. Membrane biofouling process correlated to the microbial community succession in an A/O MBR
CN103242365B (en) A kind of preparation of branch-shape polymer polyamide-amide eight methylene phosphonic acid and application thereof
CN106430648A (en) Antisludging agent used in highly hard and high alkalinity water and preparing method and antisludging method thereof
KR20150068829A (en) Draw solutes comprising alkyl ammonium salt compounds
EA201070811A1 (en) METHODS AND COMPOSITIONS FOR REMOVAL OF IMPURITIES AND WATER FROM THE BAYER METHOD
US9403853B2 (en) Trimethylolpropane core, phosphonic acid terminated dendrimer and its preparation method
RU2010154090A (en) INHIBITING SCALES EDUCATION IN ACID CONDITIONS
CN113135620A (en) Composite scale inhibitor and preparation method thereof
PH12016501464A1 (en) Primary amine-containing polymers useful as scale inhibitors
ES2430830T3 (en) Enhanced biodegradability of antifouling formulations
CN103896414A (en) Antisludging agent for hot method during sea water desalination
CN104843741A (en) Method used for applying bromine extraction bittern to sodium carbonate production
RU2333642C2 (en) Incorporated biocide
RU2018122614A (en) HEAT RESISTANT COMPOSITIONS
CN103768957A (en) Reverse osmosis membrane scale inhibitor and preparation method thereof
CN105032191A (en) Special scale inhibitor for seawater and brackish water desalination reverse osmosis membrane and preparation method thereof
US20210363008A1 (en) Process for preparing a stabilized aqueous hydrogen peroxide solution
CN104258734A (en) Film scale inhibitor and preparation method thereof
CN105709606A (en) Environment-friendly reverse osmosis membrane scale inhibiting and dispersing agent and preparation method thereof
US20210221724A1 (en) Acid grafted eo-po copolymers as silica scale inhibitors

Legal Events

Date Code Title Description
MM4A Lapse of a eurasian patent due to non-payment of renewal fees within the time limit in the following designated state(s)

Designated state(s): AM AZ BY KG MD TJ TM

MM4A Lapse of a eurasian patent due to non-payment of renewal fees within the time limit in the following designated state(s)

Designated state(s): KZ RU