SG184693A1 - Method of preventing scale in cooling water system - Google Patents
Method of preventing scale in cooling water system Download PDFInfo
- Publication number
- SG184693A1 SG184693A1 SG2012023248A SG2012023248A SG184693A1 SG 184693 A1 SG184693 A1 SG 184693A1 SG 2012023248 A SG2012023248 A SG 2012023248A SG 2012023248 A SG2012023248 A SG 2012023248A SG 184693 A1 SG184693 A1 SG 184693A1
- Authority
- SG
- Singapore
- Prior art keywords
- cooling water
- water system
- soluble polymer
- scale
- zinc
- Prior art date
Links
- 239000000498 cooling water Substances 0.000 title claims abstract description 45
- 230000003405 preventing effect Effects 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229920003169 water-soluble polymer Polymers 0.000 claims abstract description 34
- 150000003752 zinc compounds Chemical class 0.000 claims abstract description 13
- -1 phosphor compound Chemical class 0.000 claims abstract description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011701 zinc Substances 0.000 claims abstract description 9
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 9
- 239000007787 solid Substances 0.000 claims abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 24
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 9
- 239000011575 calcium Substances 0.000 abstract description 9
- 229910052791 calcium Inorganic materials 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 14
- 238000012360 testing method Methods 0.000 description 10
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 9
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 8
- 229920001577 copolymer Polymers 0.000 description 8
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 8
- 239000011976 maleic acid Substances 0.000 description 8
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 5
- 229920001519 homopolymer Polymers 0.000 description 5
- 239000004925 Acrylic resin Substances 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 4
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 2
- 229960001763 zinc sulfate Drugs 0.000 description 2
- 229910000368 zinc sulfate Inorganic materials 0.000 description 2
- BIIBYWQGRFWQKM-JVVROLKMSA-N (2S)-N-[4-(cyclopropylamino)-3,4-dioxo-1-[(3S)-2-oxopyrrolidin-3-yl]butan-2-yl]-2-[[(E)-3-(2,4-dichlorophenyl)prop-2-enoyl]amino]-4,4-dimethylpentanamide Chemical compound CC(C)(C)C[C@@H](C(NC(C[C@H](CCN1)C1=O)C(C(NC1CC1)=O)=O)=O)NC(/C=C/C(C=CC(Cl)=C1)=C1Cl)=O BIIBYWQGRFWQKM-JVVROLKMSA-N 0.000 description 1
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 description 1
- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 description 1
- 102100026735 Coagulation factor VIII Human genes 0.000 description 1
- 101000911390 Homo sapiens Coagulation factor VIII Proteins 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000137 polyphosphoric acid Polymers 0.000 description 1
- 239000002455 scale inhibitor Substances 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- KMIOJWCYOHBUJS-HAKPAVFJSA-N vorolanib Chemical compound C1N(C(=O)N(C)C)CC[C@@H]1NC(=O)C1=C(C)NC(\C=C/2C3=CC(F)=CC=C3NC\2=O)=C1C KMIOJWCYOHBUJS-HAKPAVFJSA-N 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Method of Preventing Scale in Cooling Water SystemAbstractTo provide a method of preventing scale in cooling water system which prevents calcium carbonate scale effectively in a cooling water system in water treatment where a phosphor compound is not used. A water-soluble polymer and zinc compound are added to the cooling water system such that a concentration of zinc becomes 0.5-3 mg/L, and a concentration of the water-soluble polymer becomes 2- 50 mg-solid/L in the cooling water system. By adding the water-soluble polymer together with zinc compound without adding a phosphor compound to the cooling water system, the CSI of the cooling water system is increased, whereby scale, especially calcium carbonate scale is prevented effectively even in a cooling water system having a high calcium hardness.Figure 1
Description
+ Method of Preventing Scale in Cooling Water System
[0001] :
The present invention relates to a method of preventing scale in a cooling water system, more particularly to the method for preventing calcium carbonate scale in a cooling water system in water Lreatment where a phosphorous compound is not used.
Background of Tovention : 0002]
A scale on a heat exchanger of a cooling water system decreases heat transfer . and efficiency thereof. Scaling on an inner surface of a piping reduces an effective cross-sectional area thereof, and increases discharging pressure of a pump. Further scaling may block the piping.
[0003]
Patent Document 1 discloses a method for preventing calcium carbonate scale in a cooling water system wherein both of phosphor compound such as phosphonic acid or polyphosphoric acid, and water soluble polymer are used. However, phosphor compound is unfavorable for the environment.
Operation at a high cycle number has been desired in a cooling water system for saving water consumption and reducing blowdown volume. However, as CSI{Critical
Saturation Index) of calcium carbonate is low in a conventional cooling water system, a low cycle number and a low calcium hardness are required for preventing calcium carbonate scaling. {0004]
Patent Document 1: Japanese Patent Publication H 09-174092 A
Object and Summary of Invention
[0005]
It is an object of the present invention to provide a method of preventing scale of calcium carbonate in cooling water system where a phosphor compound is not used,
[0006] : : The present inventors have found that adding both water-soluble polymer and zine compound to a cooling water system increases CS1 in the cooling water system whereby calcium carbonate scale is reduced, and water consumption and blowdown volume are reduced in the cooling water system, and have achieved the present invention.
[0007]
The present invention provides a method of preventing scale in cooling water system wherein a water-soluble polymer and zine compound are added to the cooling water system such that a concentration of zine becomes 0.5-3 mg/L and a concentration of the water-soluble polymer becomes 2-50 mg-solid/L in the cooling water system.
[0008]
A phosphor compound may not be added to the cooling water system.
[0009]
According to the present invention, by adding the water-soluble polymer together with zinc compound without adding a phosphor compound to the cooling water system, the CSI of the cooling water system is increased, whereby scale, especially calcium carbonate scale is prevented effectively even in a cooling water system having high calcium hardness.
[0010]
It is not fully certain why scaling is prevented by the present invention which uses the water-soluble polymer and the zinc compound, but it secms that calcium carbonate scale is prevented due to scale-dispersing effect of the water—soluble polymer and effect of zinc to inhibit crystal growth of calcium carbonate.
[0011]
The scale preventing effect caused by the water-soluble polymer and the zine compound in the present invention enables operation at a high cycle number, so that water consumption and blowdown volume are reduced.
[0012]
Fig. 1 is a graph showing results (CSI values) of Examples 1-4 and Comparative
Examples 1 and 2.
Fig.2 is a graph showing results (CSI values) of Examples 5-10 and Comparative
Examples 3-8.
Detailed Description of the Preferred Embodiments [00131
The preferred embodiments are detailed hereafter.
[0014]
The water-soluble polymer and zinc compound are added to a cooling water system in the present invention.
[0015]
Zine compound may be zinc sulfate or zinc chloride, but not limitative thereto.
One kind of or two or more kinds of zinc compounds may be added.
[0016] :
The water-soluble polymer includes various kinds of polymers used as a scale inhibitor. The water-soluble polymer is preferably, but not limitative thereto, & low-molecular—-weight water-soluble polymer having a weight-average molecular weight of 5000-50000. The water-soluble polymer includes homopolymer or copolymer formed by polymerizing or copolymerizing one kind of or two or more kinds of monomers selected from the group consisting of acrylic acid, methacrylic acid, HAPS (2-hydroxy-3—allyloxy-l-propanesulfonic acid), maleic acid, AMPS (2-acrylamide-2-methylpropanesulfonie acid), HEMA (2~ hydroxyethylmethacrylate), methyl acrylate, styrenesulfonic acid, and isobutylene. The water-soluble polymer is preferably homopolymer or copolymer formed by polymerizing or copolymerizing one kind of or wwo or more kinds of : - monomers selected from the group consisting of acrylic acid, methacrylic acid,
HAPS, maleic acid, AMPS and isobutylene.
[0017] . The low-molecular-weight water-soluble polymer is preferably homopolymer of maleic acid or acrylic acid, copolymer of acrylic acid and HAPS in which a molecular ratio of acrylic acid and HAPS is 20-80:80-20, copolymer of acrylamide and AMPS in which a molecular ratio of acrylamide and AMPS is 20-80:80-20, or copolymer of maleic acid and isobutylene in which a molecular ratio of maleic acid and isobutylene is 20-80:80-20 are preferable.
One kind of or two or more kinds of the water-soluble polymers may be added,
[0018]
The zinc compound is added to the cooling water system such that a concentration of zinc becomes 0.5-3 mg/L in the cooling water system, The zinc compound of less than 0.5 mg/L provides insufficient effect. The zinc compound of more than 3 mg/L is likely to cause scale of zinc salt.
[0019]
The water-soluble polymer is added to the cooling water system such that a concentration of the water-soluble polymer becomes 2-50 mg /L, more preferably 10-20 mg /L as a solid content in the cooling water system. The water-soluble polymer of less than 2 mg/L provides insufficient scale-dispersing effect. The water-soluble polymer of more than 50 mg/L is likely to cause gelation of the water-soluble polymer and foaming of the cooling water.
[0020]
In the present invention, favorable scale preventing effecl is caused by adding the water-soluble polymer together with the zinc compound without adding =a phosphor compound to the cooling water system, thereby the present invention is preferable to be applied to the cooling water system to which a phosphor compound may not be added and zinc compound may be added.
[0021]
According to the present invention, by adding the water-soluble polymer together with zinc compound to the cooling water system, the CSI of the cooling water system is increased, whereby scale is prevented effectively even in a cooling water system having a high calcium hardness. The present invention can be applied to the cooling water system wherein the calcium hardness is about 1000 mg-CaC0,/L, but preferably the present invention is applied to the cooling water system where the calcium hardness is 500 mg—CaC0,/L or less.
[0022]
Hereafter, the present invention is more specifically described with reference to Examples. Co
[0023]
Water-soluble polymers listed below were used in Examples and Comparative
Examples, respectively.
Copolymer of acrylic resin (AA) and 2-acrylamide-2- methylpropanesulfonic acid (AMPS), having a molecular weight of 10000, and having a molecular ratio of AA to AMPS of 4:1 (hereafter, abbreviated to "RA/AMPS”) ;
Copolymer of acrylic resin (AA) and 3-allyloxy-2- hydroxypropanesulfonic acid (HAPS), having a molecular weight of 5000, and having a molecular ratio of AA to HAPS of 4:1 (hereafter, abbreviated to "AA/HAPS®) ;
Homopolymer of maleic acid (MA) having a molecular weight of 500 (hereafter, abbreviated to "PMA"); ° :
Homopolymer of acrylic resin (AA) having a molecular weight of 5000 (hereafter, abbreviated to “PAL"); and
Copolymer of acrylic resin (IB) and maleic acid (MA) having a molecular weight of 15000, having a molecular ratio of IB to MA of 1:1 (hereafter, abbreviated to “IB/MA").
[0024]
Experiments were conducted according to the following condition and procedure. <Condition> testing device: isothermal tank, 500 ml screw-top bottle testing period: 20 hours testing temperature: 50°C testing water quality: calcium hardness of 300 mg—CaC0,/L, acid consumption pH of 4.8 {Procedure> i) Ultrapure water was put in the 500 mL screw-top bottle at an amount : after deduction of amounts of reagents from 500mL. ii) 6 ml of 2.5 weight % of calcium hardness solution (calcium nitrate), required amount of water-soluble polymer (shown in Table 1) solution, required amount of zinc sulfate solution, 6 ml of sodium bicarbonate solution for acid consumption (pH4.8) were added in the water respectively, and then pH of the water was adjusted by 0.01-1N of NaOH or sulfuric acid. iii) 0.5 weight % of calcium carbonate solution was added as seed crystal at an amount of 10mL. iv) The screw-top bottle was put into the isothermal tank at 50°C, and was left at rest. v) 20 hours later, 100-150 mL of the test water in the screw—top bottle was filtered by 0.22 pm GS¥P filter. vi) The calcium hardness of the filtrate was measured.
vii) After the temperature of the residual test water in the screw-top bottle decreased to 30°C, pH of the residual test water was measured. viii) ST (Langelier’s index) was calculated after the test, and the maximum value thereof was dealt with as CSI.
[0025]
Examples. 1-4, Comparative Examples 1,2
In cach Example, 15 mg~solid/L of AA/HAPS was used as the water-soluble polymer, and the zinc concentration was set to 0 mg/L(Comparative Example 1), 0.2 mg/L(Comparative Example 2), 0.5 mg/L(Example 1), 1 mg/L(Example 2), 2 mg/L (Example 3), and 3 mg/L (Example 3), respectively. CSI obtained in each
Example is shown in Fig. 1.
As shown in Fig. 1, CSI markedly increased at the zinc concentration of 0.5-3 mg/L, and CSI increased by 0.4 at maximum {rom zine-free condition. -
[0026]
Examples 6-10, Comparative Examples 3-8
In each test, the water-soluble polymer shown in Table 1 was used at an amount shown in Table 1. In Examples 5-10, the zinc concentration was set to 2 mg/L. In
Comparative Examples 3~8, zinc was not added. CSI of each test is shown in Fig. 2. i
[0027]
Table 1 . water-soluble polymer
Kind concentration (mg—solid/L)
Example 5 and
Comparative PMA 20
Example 3
Example 6 and
Comparative IB/MA
Example 4
Example 7 and
Comparative AA/HAPS 20
Example 5
Example 8 and
Comparative AASAMPS 20
Example 9 and
Comparative PAA 20 : Example 7
Example10 IB/MA Ca
Comparative AA/AMPS
Example8
[0028]
As shown in Fig.2, by adding zinc, the effect of the water-soluble polymer was improved, thereby increasing CSI.
Claims (2)
- Claims 1 A method of preventing scale in a cooling water system, wherein a : water-soluble polymer and zinc compound are added to the cooling water system such that a concentration of zinc becomes 0. 5-3 mg/L, and a concentration of the water-soluble polymer becomes 2-50 mg-solid/L in the cooling water system.
- 2 The method of preventing scale in a cooling water system according to claim 1, wherein a phosphor compound is not added to the cooling water system.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011074619A JP2012206044A (en) | 2011-03-30 | 2011-03-30 | Method for preventing cooling water system from scaling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SG184693A1 true SG184693A1 (en) | 2012-10-30 |
Family
ID=46987254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SG2012023248A SG184693A1 (en) | 2011-03-30 | 2012-03-29 | Method of preventing scale in cooling water system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2012206044A (en) |
| CN (1) | CN102730849A (en) |
| SG (1) | SG184693A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6589286B2 (en) * | 2015-02-13 | 2019-10-16 | 栗田工業株式会社 | Initial processing agent for circulating cooling water and initial processing method of circulating cooling water system |
| JP6057002B1 (en) * | 2016-03-24 | 2017-01-11 | 栗田工業株式会社 | Anti-scale agent for reverse osmosis membrane and reverse osmosis membrane treatment method |
| JP6777130B2 (en) | 2018-10-05 | 2020-10-28 | 栗田工業株式会社 | Membrane water treatment chemicals and membrane treatment methods |
| JP6635173B1 (en) * | 2018-11-01 | 2020-01-22 | 栗田工業株式会社 | Corrosion protection method for metal members of cooling water system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1374270A (en) * | 1971-12-10 | 1974-11-20 | Ciba Geigy Ag | Polymaleic anhydride compositions and their use |
| CA1118589A (en) * | 1979-04-05 | 1982-02-23 | Gary E. Geiger | Method of corrosion inhibition in aqueous mediums |
| GB8309573D0 (en) * | 1983-04-08 | 1983-05-11 | Ciba Geigy Ag | Water treatment composition |
| JPH01299699A (en) * | 1988-05-30 | 1989-12-04 | Hakutou Kagaku Kk | Non-phosphorus water treating agent for preventing corrosion and scale of metals in water system |
| JP3389064B2 (en) * | 1997-06-23 | 2003-03-24 | 株式会社荏原製作所 | Water-based anticorrosion agent and anticorrosion method |
| JP2005270769A (en) * | 2004-03-24 | 2005-10-06 | Kurita Water Ind Ltd | Scale prevention method |
| CN101700935A (en) * | 2009-11-09 | 2010-05-05 | 中国海洋石油总公司 | Phosphorus-free corrosion-inhibition antiscalant used for industrial circulation cooling water |
-
2011
- 2011-03-30 JP JP2011074619A patent/JP2012206044A/en active Pending
-
2012
- 2012-03-27 CN CN2012100895525A patent/CN102730849A/en active Pending
- 2012-03-29 SG SG2012023248A patent/SG184693A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN102730849A (en) | 2012-10-17 |
| JP2012206044A (en) | 2012-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2012132892A1 (en) | Scale preventing agent for reverse osmosis membrane and scale preventing method | |
| CN108002558A (en) | A kind of phosphate-free corrosion inhibition antisludging agent | |
| WO2015101246A1 (en) | Terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning, and method of preparing said inhibitor | |
| SG184693A1 (en) | Method of preventing scale in cooling water system | |
| JP5884730B2 (en) | Reverse osmosis membrane scale inhibitor and scale prevention method | |
| CN103539269B (en) | Compound aggregate type corrosion and scale inhibitor and preparation method thereof | |
| WO2014157139A1 (en) | Scale inhibiting method and magnesium hydroxide scale inhibitor for reverse osmosis membrane | |
| US20160046515A1 (en) | Method for preventing scale deposition and scale inhibitor | |
| CN102399018B (en) | Reverse osmosis membrane scale inhibitor and application thereof | |
| CN100368320C (en) | Polymer for water treatment | |
| CN113912195A (en) | Non-phosphorus scale inhibitor for inhibiting silicon scale and preparation method thereof | |
| TWI788609B (en) | Scale inhibitor for cooling water and scale inhibition method for cooling water | |
| CN103436873A (en) | Environment-friendly non-phosphorus pretreatment filming agent | |
| CN100451173C (en) | Corrosion inhibition method | |
| JP5803207B2 (en) | Cooling water metal anticorrosion treatment method | |
| AU2012289049B2 (en) | Process for producing maleic acid-isoprenol copolymers | |
| AU2012292468B2 (en) | Copolymers made of isoprenol, monoethylenically unsaturated monocarboxylic acids and sulphonic acids, process for producing same and use of same as deposit inhibitors in systems conveying water | |
| CN112320975A (en) | Phosphorus-containing scale inhibitor for industrial circulating water and preparation method and application thereof | |
| US7459513B2 (en) | Acrylic-acid-based homopolymers comprising taurine modified for the treatment of water | |
| US20130180926A1 (en) | Preparing maleic acid-isoprenol copolymers | |
| CN110066033B (en) | Low-phosphorus corrosion and scale inhibitor composition, low-phosphorus corrosion and scale inhibitor and application thereof | |
| US8993701B2 (en) | Copolymers of isoprenol, monoethylenically unsaturated monocarboxylic acids and sulfonic acids, methods for production thereof and use thereof as deposit inhibitors in water-bearing systems | |
| CN111137990A (en) | RO (reverse osmosis) non-phosphorus scale inhibitor as well as preparation method and application thereof | |
| CN115159697A (en) | Scale inhibitor for wet-process phosphoric acid production | |
| CN117735739A (en) | High-temperature corrosion inhibitor and preparation method thereof |