CN105129931A - Bactericidal scale and corrosion inhibitor for seawater desalination - Google Patents
Bactericidal scale and corrosion inhibitor for seawater desalination Download PDFInfo
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- CN105129931A CN105129931A CN201510395917.0A CN201510395917A CN105129931A CN 105129931 A CN105129931 A CN 105129931A CN 201510395917 A CN201510395917 A CN 201510395917A CN 105129931 A CN105129931 A CN 105129931A
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Abstract
The invention provides a bactericidal scale and corrosion inhibitor for seawater desalination, and belongs to the technical field of chemical engineering. The bactericidal scale and corrosion inhibitor comprises, by weight, 10-15% of polyquaternary ammonium salt, 20-30% of sodium polyepoxysuccinate, 20-30% of polyaspartic acid-polymaleic anhydride, 5-10% of a zinc salt, 5-10% of dodecyl dimethyl benzyl ammonium bromide, and the balance of water. The bactericidal scale and corrosion inhibitor has scale inhibition, corrosion inhibition and sterilization functions, and all components of the bactericidal scale and corrosion inhibitor have very good intermiscibility, cooperativity and complementarity, so the bactericidal scale and corrosion inhibitor can substitute present single function scale and corrosion inhibitors and bactericides, and has comprehensive functions; and a formula and a preparation method of the bactericidal scale and corrosion inhibitor are green, compound raw materials adopted in the invention contain no phosphorus and cause no water eutrophication, discharged water causes no pollution to environment, and the preparation method is simple and feasible, is a clean technology, and has no emission of industrial three wastes.
Description
The present invention relates to a kind of bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor, particularly a kind of anti-incrustation corrosion inhibitor of complete function, belongs to chemical technology field.
Background technology
Develop rapidly along with industrial, industrial water consumption increases day by day, and China is the country that Freshwater resources are comparatively deficient, therefore develops desalination technology extremely urgent.Namely sea water desaltination utilizes sea water desalinization to produce fresh water.Be the increment technique of increasing income realizing water resources utilization, fresh water total amount can be increased, and not by space-time and weather effect, water quality is good, price is gradually reasonable, can ensure the stable water supply such as coastal Drinking Water for Residents and Industrial Boiler moisturizing.In seawater desalination system, by water quality, process conditions, often can there is corrosion and scaling phenomenon in sea water desaltination water treatment system equipment, have a strong impact on heat exchange efficiency, reduces service life of equipment, affect the safe operation of unit.In seawater, high Na+ and high Cl-also will produce very adverse influence to the membranous system of equipment simultaneously.And with the contact process of air, can by air with dust, microorganism, dusty gas is (as SO
2, H
2s, NH
3deng) or insect bring water system into, cause water pollution, cause corrosion or the problem such as dirt deposition, wherein the harm especially severe that brings of microorganism.An important feature of microbiological corrosion is that corrosion speed concentrates on part, mainly due to microbial reproduction will produce sour environment, as sulphate reducing bacteria produces hydrogen sulfide, the sour environment that thiobacterium, iron bacteria and wire bacterium produce, cause local corrosion, finally will cause serious spot corrosion until perforation, it endangers especially severe.
In order to prevent Na in equipment scaling reduction system simultaneously
+and Cl
-content, improve plant factor, save energy, guarantee produce normal operation, need in seawater desalination system, add various anti-incrustation corrosion inhibitor.At present, the Scale inhibitors for this field mainly contains the kinds such as poly-phosphate, organophosphate, poly carboxylic acid.Poly carboxylic acid is as Scale inhibitors, and using more is polyacrylic acid (sodium) and polymaleic acid etc.The many employings of foreign project add NaClO and CuSO
4carry out sterilization, this method will certainly increase chloride ion content in seawater.Sterilant conventional at present mainly contains two large classes, i.e. oxidative bactericide and non-oxidative bactericide.Wherein non-oxidative bactericide uses at most at home, and the Non-oxidized Biocidal algae-killing agent that technology is more ripe is quaternary ammonium salt and isothiazolinone, all has the features such as wide spectrum, efficient, low toxicity.
Current sea water desaltination use, medicament function ratio is more single, usually need inhibiter, Scale inhibitors and sterilant with the use of.When jointly using between medicament, may antagonistic action be produced, drug effect is reduced, so must must consider to mix, the problem such as compatibleness, also need to do a large amount of work and screen there is synergistic inhibiter, Scale inhibitors and sterilant each other.
Based on the problems referred to above, be necessary to develop a kind of multipurpose agent simultaneously with scale inhibition, inhibition and germicidal action, this kind of medicament is also required to have the features such as high efficiency, greenization, generalization, production simplification, transportation safety, dispensing convenient purification.This kind of multifunctional water treating agent can add new vitality to domestic market undoubtedly, and its market requirement will have development prospect.
Summary of the invention
The object of the present invention is to provide and a kind of to use for sea water desaltination, there is the multi-functional Non-oxidized Biocidal algae-killing agent of scale inhibition, inhibition and sterilization simultaneously, and there is the features such as efficient, greenization, preparation method are simple.
Object of the present invention realizes by the following technical solutions:
A kind of bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor, its ingredients by weight per-cent consists of:
Preferred further, described polyquaternium solids content >=40%.
Preferred further, described polyepoxy sodium succinate molecular weight is within the scope of 800-1500.
Preferred further, described poly aspartic acid-polymaleic anhydride mixture, polymaleic anhydride molecular-weight average is wherein greater than 5500, and the ratio of the two is 2:3.
Preferred further, described zinc salt is zinc sulfate.
Preferred further, the step of its preparation method is:
(1) after polymaleic anhydride being stirred by water dissolution in a kettle., poly aspartic acid is added in reactor, continue stirring 20 ~ 30 minutes;
(2) zinc salt and water being added stirring at normal temperature in reactor makes zinc salt fully dissolve, and then adds polyepoxy sodium succinate and stirs 20 ~ 30 minutes;
(3) finally add polyquaternium in a kettle. to stir after 10 ~ 20 minutes, then add bromination dodecyl dimethyl benzyl ammonium bromide stirring 20 ~ 30 minutes, after stirring, namely obtain product.
The invention has the beneficial effects as follows:
(1) the present invention be directed to sea water desaltination to use, there is scale inhibition, inhibition and sterilizing function simultaneously, and each component of the present invention have good intermiscibility, synergetic property and complementarity, alternative existing simple function anti-incrustation corrosion inhibitor and sterilant, function more comprehensively, more remarkable effect.
(2) formula of the present invention and the equal greenization of preparation method.Not phosphorous in the composite raw material that the present invention adopts, can not cause body eutrophication, draining can not to environment; And preparation method's simple possible of the present invention, be cleaning procedure, discharge without three industrial wastes.
(3) component polymeric quaternary ammonium salts solids content >=40% of the present invention, is a kind of strong cation high molecular polymer, has good solubility property in water.It also belongs to non oxidizing bactericide, has wide spectrum, efficiently sterilization algae removal ability, effectively can control bacterium algae propagation and foundry loam growth in water, and has good sludge stripping effect and certain dispersion, osmosis, also has certain corrosion inhibition simultaneously.
(4) component poly aspartic acid of the present invention and polymaleic anhydride mixture, polymaleic anhydride molecular-weight average is wherein greater than 5500, and polymaleic anhydride has high efficiency dispersion, with Ca on the active growth point that they can be adsorbed onto calcium carbonate crystal
2+chelating, inhibits lattice to grow up to certain direction, and lattice is distorted childlike, carboxyl (-COOH) quantity is more, and scale inhibition effect is better.Poly aspartic acid belongs to the class in polyamino acid, sea water desaltination with in have existing antiscaling dispersion effect, have corrosion inhibition again.With macromolecule polymaleic anhydride compound, anticorrosion-antiscaling property is more efficient, adds zinc salt and strengthens corrosion inhibition again.
(5) component dodecyl dimethyl benzyl ammonium bromide of the present invention has the character of typical cationic surfactants, has good dispersion, peels off foundry loam effect.Stable in properties, bactericidal property is good, has good synergy with polymeric quaternary ammonium salts, in sea water desaltination is used, has an enormous advantage compared with chloride sterilant.
(6) molecular weight of component polyepoxy sodium succinate of the present invention is within the scope of 800-1500, and it is a kind of without phosphorus, polynary anti-incrustation corrosion inhibitor of non-nitrogen " green " environment-friendly type.There is good scale inhibition and dispersion performance to the calcium carbonate in water, calcium sulfate, barium sulfate, Calcium Fluoride (Fluorspan) and silicon dirt, be particularly useful for sea water desaltination use, high concentration ratio can be realized and run.
Embodiment
The technique means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with specific embodiment, set forth the present invention further, but following embodiment being only the preferred embodiments of the present invention, and not all.Based on the embodiment in embodiment, those skilled in the art under the prerequisite not making creative work obtain other embodiment, all belong to protection scope of the present invention.
Embodiment 1: a kind of sea water desaltination agent for preventing scale, corrosion-resistance and disinfection of the present invention, its ingredients by weight per-cent consists of:
Wherein, polyquaternium solids content >=40%; Polyepoxy sodium succinate molecular weight is within the scope of 800-1500; Poly aspartic acid-polymaleic anhydride mixture, polymaleic anhydride molecular-weight average is wherein greater than 5500, and the ratio of the two is 2:3; Zinc salt is zinc sulfate.
The step of preparation method of the present invention is:
(1) after polymaleic anhydride being stirred by water dissolution in a kettle., poly aspartic acid is added in reactor, continue stirring 20 ~ 30 minutes;
(2) zinc salt and water being added stirring at normal temperature in reactor makes zinc salt fully dissolve, and then adds polyepoxy sodium succinate and stirs 20 ~ 30 minutes;
(3) finally add polyquaternium in a kettle. to stir after 10 ~ 20 minutes, then add bromination dodecyl dimethyl benzyl ammonium bromide stirring 20 ~ 30 minutes, after stirring, namely obtain product.
Embodiment 2: a kind of bactericidal properties sea water desaltination of the present invention anti-incrustation corrosion inhibitor, its ingredients by weight per-cent consists of:
Wherein, polyquaternium solids content >=40%; Polyepoxy sodium succinate molecular weight is within the scope of 800-1500; Poly aspartic acid-polymaleic anhydride mixture, polymaleic anhydride molecular-weight average is wherein greater than 5500, and the ratio of the two is 2:3; Zinc salt is zinc sulfate.
The step of preparation method of the present invention is:
(1) after polymaleic anhydride being stirred by water dissolution in a kettle., poly aspartic acid is added in reactor, continue stirring 20 ~ 30 minutes;
(2) zinc salt and water being added stirring at normal temperature in reactor makes zinc salt fully dissolve, and then adds polyepoxy sodium succinate and stirs 20 ~ 30 minutes;
(3) finally add polyquaternium in a kettle. to stir after 10 ~ 20 minutes, then add bromination dodecyl dimethyl benzyl ammonium bromide stirring 20 ~ 30 minutes, after stirring, namely obtain product.
Embodiment 3: a kind of bactericidal properties sea water desaltination of the present invention anti-incrustation corrosion inhibitor, its ingredients by weight per-cent consists of:
Wherein, polyquaternium solids content >=40%; Polyepoxy sodium succinate molecular weight is within the scope of 800-1500; Poly aspartic acid-polymaleic anhydride mixture, polymaleic anhydride molecular-weight average is wherein greater than 5500, and the ratio of the two is 2:3; Zinc salt is zinc sulfate.
The step of preparation method of the present invention is:
(1) after polymaleic anhydride being stirred by water dissolution in a kettle., poly aspartic acid is added in reactor, continue stirring 20 ~ 30 minutes;
(2) zinc salt and water being added stirring at normal temperature in reactor makes zinc salt fully dissolve, and then adds polyepoxy sodium succinate and stirs 20 ~ 30 minutes;
(3) finally add polyquaternium in a kettle. to stir after 10 ~ 20 minutes, then add bromination dodecyl dimethyl benzyl ammonium bromide stirring 20 ~ 30 minutes, after stirring, namely obtain product.
Embodiment 4: a kind of bactericidal properties sea water desaltination of the present invention anti-incrustation corrosion inhibitor, its ingredients by weight per-cent consists of:
Wherein, polyquaternium solids content >=40%; Polyepoxy sodium succinate molecular weight is within the scope of 800-1500; Poly aspartic acid-polymaleic anhydride mixture, polymaleic anhydride molecular-weight average is wherein greater than 5500, and the ratio of the two is 2:3; Zinc salt is zinc sulfate.
The step of preparation method of the present invention is:
(1) after polymaleic anhydride being stirred by water dissolution in a kettle., poly aspartic acid is added in reactor, continue stirring 20 ~ 30 minutes;
(2) zinc salt and water being added stirring at normal temperature in reactor makes zinc salt fully dissolve, and then adds polyepoxy sodium succinate and stirs 20 ~ 30 minutes;
(3) finally add polyquaternium in a kettle. to stir after 10 ~ 20 minutes, then add bromination dodecyl dimethyl benzyl ammonium bromide stirring 20 ~ 30 minutes, after stirring, namely obtain product.
Embodiment 5: a kind of bactericidal properties sea water desaltination of the present invention anti-incrustation corrosion inhibitor, its ingredients by weight per-cent consists of:
Wherein, polyquaternium solids content >=40%; Polyepoxy sodium succinate molecular weight is within the scope of 800-1500; Poly aspartic acid-polymaleic anhydride mixture, polymaleic anhydride molecular-weight average is wherein greater than 5500, and the ratio of the two is 2:3; Zinc salt is zinc sulfate.
The step of preparation method of the present invention is:
(1) after polymaleic anhydride being stirred by water dissolution in a kettle., poly aspartic acid is added in reactor, continue stirring 20 ~ 30 minutes;
(2) zinc salt and water being added stirring at normal temperature in reactor makes zinc salt fully dissolve, and then adds polyepoxy sodium succinate and stirs 20 ~ 30 minutes;
(3) finally add polyquaternium in a kettle. to stir after 10 ~ 20 minutes, then add bromination dodecyl dimethyl benzyl ammonium bromide stirring 20 ~ 30 minutes, after stirring, namely obtain product.
Embodiment 6: a kind of bactericidal properties sea water desaltination of the present invention anti-incrustation corrosion inhibitor, its ingredients by weight per-cent consists of:
Wherein, polyquaternium solids content >=40%; Polyepoxy sodium succinate molecular weight is within the scope of 800-1500; Poly aspartic acid-polymaleic anhydride mixture, polymaleic anhydride molecular-weight average is wherein greater than 5500, and the ratio of the two is 2:3; Zinc salt is zinc sulfate.
The step of preparation method of the present invention is:
(1) after polymaleic anhydride being stirred by water dissolution in a kettle., poly aspartic acid is added in reactor, continue stirring 20 ~ 30 minutes;
(2) zinc salt and water being added stirring at normal temperature in reactor makes zinc salt fully dissolve, and then adds polyepoxy sodium succinate and stirs 20 ~ 30 minutes;
(3) finally add polyquaternium in a kettle. to stir after 10 ~ 20 minutes, then add bromination dodecyl dimethyl benzyl ammonium bromide stirring 20 ~ 30 minutes, after stirring, namely obtain product.
In order to prove sterilization of the present invention, scale inhibition and corrosion inhibition, the Reliable Evaluating Methods of Their Performance of the bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor of above-described embodiment gained is as follows:
Bactericidal property measures
Recirculated cooling water bactericidal property evaluation (DL/T1116-2009) is adopted to measure:
Plant and instrument: balance, sensibility reciprocal 0.1mg, constant-temperature table, precision ± 2 DEG C, medical steam sterilization pan, oven, filtration sterilization equipment, biomicroscope;
Experiment condition: shaking table temperature 40 DEG C, rotating speed 100r/min ~ 120r/min, experimental period t are 10 hours, and test water sample is seawater.Killing rate is calculated as follows:
Killing rate Y=(A
0-A
t/ A
0) × 100%
A
0---the bacterium sum that blank assay water sample is initial;
A
t---the bacterium sum that experiment water sample detects when t.
Bactericidal property measurement result sees the following form 1
Table 1
As shown in Table 1, the killing rate of embodiment 1 to 6 more than bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor under 100mg/L condition is all more than 97.8, wherein best with the medicament disinfecting effect of embodiment 3.
Scale-inhibiting properties measures
Static-state scale inhibition test method(s) (GB16632-1996) is adopted to carry out scale-inhibiting properties mensuration:
Plant and instrument: acidometer pHS-3C type, precision ± 0.02; Electric-heated thermostatic water bath HHS21-4 type, precision 1 DEG C;
Test conditions: test temperature (80 ± 1) DEG C, test period 72h, test water is seawater.Ca before and after test
2+demarcate with EDTA standardized solution.Scale inhibition performance is calculated as follows:
Scale inhibition performance η=(X
2-X
1/ X
0-X
1) × 100%
X
1, X
2---do not add medicament and the test water Ca adding medicament
2+mass concentration, mg/L;
X
0---Ca during concentrated 7 times of make up water before test
2+mass concentration theoretical value, mg/L.
Scale-inhibiting properties measurement result sees the following form 2:
Table 2
| Embodiment | Drug concentration | Scale inhibition performance (%) |
| ppm(mg/L) | ||
| 1 | 100 | 98.5 |
| 2 | 100 | 99.4 |
| 3 | 100 | 99.3 |
| 4 | 100 | 99.6 |
| 5 | 100 | 95.7 |
| 6 | 100 | 98.9 |
As shown in Table 1, the static-state scale inhibition rate of embodiment 1 to 6 bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor under 100mg/L condition is all more than 95.7%, wherein best with the scale inhibition effect of embodiment 4.
Corrosion inhibition measures
Rotary hanging plate weight-loss method (HG/T2159-1991) is adopted to carry out corrosion inhibition mensuration;
Plant and instrument: rotary hanging plate corrosion test instrument RCC-III type;
Test conditions: test temperature 45 DEG C, speed of rotation 80r/min, test period 72h, test water is seawater, and test piece is cooling and contraction standard corrosion coupon I type, and corrosion rate is calculated as follows:
Y
0＝8760×m
0×10/(s×ρ×t)
Y
1＝8760×m×10/(s×ρ×t)
W＝(Y
0-Y
1)/Y
0×100％
Y
0---the corrosion rate of blank test test piece, mm/a;
Y
1---the corrosion rate of test piece after adding medicine, mm/a;
W---corrosion inhibition rate, %;
M
0---the mass loss of blank test test piece, g;
M---the mass loss of test piece after adding medicine, g;
S---strip amasss, cm
2;
ρ---test piece density, g/cm
3;
T---test period, h;
8760---the hours suitable with 1 year, h/a;
10---the millimeter suitable with 1cm; Mm/cm.
Corrosion inhibition measurement result sees the following form 3:
Table 3
As shown in Table 3, the corrosion inhibition of embodiment 1 to 6 bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor under 100mg/L condition is good, and its Chinese medicine is the most obvious to the corrosion mitigating effect of brass test piece, and corrosion inhibition rate can reach 91.4%.
To sum up, can find out from table 1, table 2 and table 3, the sterilization of medicament of the present invention, scale inhibition, corrosion inhibition are all more excellent, show that the present invention has sterilization, scale inhibition, corrosion inhibitive function simultaneously, each component has good intermiscibility, synergetic property and complementarity, alternative existing simple function sterilant and anti-incrustation corrosion inhibitor.
Claims (6)
1. a bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor, is characterized in that, its ingredients by weight per-cent consists of:
Polyquaternium 10 ~ 15%
Polyepoxy sodium succinate 20 ~ 30%
Poly aspartic acid 10 ~ 15%
Polymaleic anhydride 10 ~ 15%
Zinc salt 5 ~ 10%
Bromination dodecyl dimethyl benzyl ammonium bromide 5 ~ 10%
The water of surplus.
2. a kind of bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor according to claim 1, is characterized in that, described polyquaternium solids content >=40%.
3. a kind of bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor according to claim 1, it is characterized in that, described polyepoxy sodium succinate molecular weight is within the scope of 800-1500.
4. a kind of bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor according to claim 1, it is characterized in that, described poly aspartic acid and polymaleic anhydride mixture, polymaleic anhydride molecular-weight average is wherein greater than 5500, and the ratio of the two is 2:3.
5. a kind of bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor according to claim 1, it is characterized in that, described zinc salt is zinc sulfate.
6. a kind of bactericidal properties sea water desaltination anti-incrustation corrosion inhibitor according to claim 1, it is characterized in that, the step of its preparation method is:
(1) after polymaleic anhydride being stirred by water dissolution in a kettle., poly aspartic acid is added in reactor, continue stirring 20 ~ 30 minutes;
(2) zinc salt and water being added stirring at normal temperature in reactor makes zinc salt fully dissolve, and then adds polyepoxy sodium succinate and stirs 20 ~ 30 minutes;
(3) finally add polyquaternium in a kettle. to stir after 10 ~ 20 minutes, then add bromination dodecyl dimethyl benzyl ammonium bromide stirring 20 ~ 30 minutes, after stirring, namely obtain product.
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|---|---|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105624714A (en) * | 2016-01-08 | 2016-06-01 | 青岛洁能环保有限公司 | Multifunctional care solution for ship pipes |
| CN105746512A (en) * | 2016-03-08 | 2016-07-13 | 佛山市聚成生化技术研发有限公司 | Quaternary ammonium salt type water treatment bactericide |
| CN105766984A (en) * | 2016-03-28 | 2016-07-20 | 广东省石油化工研究院 | Biocide of marine organisms |
| CN106242092A (en) * | 2016-10-09 | 2016-12-21 | 广西大学 | A kind of composite slow-corrosion scale resistor compositions |
| CN109987723A (en) * | 2019-04-29 | 2019-07-09 | 郑州轻工业学院 | A kind of non-phosphorus scale and corrosion inhibitor and its preparation method and application |
| EP3496540A4 (en) * | 2016-08-11 | 2020-07-15 | Ecolab USA Inc. | Interaction between antimicrobial quaternary compounds and anionic surfactants |
| CN113967411A (en) * | 2020-07-23 | 2022-01-25 | 威海君创环保科技有限公司 | Non-phosphorus reverse osmosis membrane scale inhibitor and preparation method thereof |
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2015
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| CN105624714A (en) * | 2016-01-08 | 2016-06-01 | 青岛洁能环保有限公司 | Multifunctional care solution for ship pipes |
| US11406103B2 (en) | 2016-03-01 | 2022-08-09 | Ecolab Usa Inc. | Sanitizing rinse based on quat-anionic surfactant synergy |
| CN105746512A (en) * | 2016-03-08 | 2016-07-13 | 佛山市聚成生化技术研发有限公司 | Quaternary ammonium salt type water treatment bactericide |
| CN105766984A (en) * | 2016-03-28 | 2016-07-20 | 广东省石油化工研究院 | Biocide of marine organisms |
| EP3496540A4 (en) * | 2016-08-11 | 2020-07-15 | Ecolab USA Inc. | Interaction between antimicrobial quaternary compounds and anionic surfactants |
| US11044907B2 (en) | 2016-08-11 | 2021-06-29 | Ecolab Usa Inc. | Interaction between antimicrobial quaternary compounds and anionic surfactants |
| US11839209B2 (en) | 2016-08-11 | 2023-12-12 | Ecolab Usa Inc. | Interaction between antimicrobial quaternary compounds and anionic surfactants |
| CN106242092A (en) * | 2016-10-09 | 2016-12-21 | 广西大学 | A kind of composite slow-corrosion scale resistor compositions |
| CN109987723A (en) * | 2019-04-29 | 2019-07-09 | 郑州轻工业学院 | A kind of non-phosphorus scale and corrosion inhibitor and its preparation method and application |
| CN109987723B (en) * | 2019-04-29 | 2021-11-19 | 郑州轻工业学院 | Non-phosphorus scale and corrosion inhibitor and preparation method and application thereof |
| CN113967411A (en) * | 2020-07-23 | 2022-01-25 | 威海君创环保科技有限公司 | Non-phosphorus reverse osmosis membrane scale inhibitor and preparation method thereof |
| CN113967411B (en) * | 2020-07-23 | 2023-11-17 | 威海君创环保科技有限公司 | Phosphate-free reverse osmosis membrane scale inhibitor for scale inhibition of calcium ions, magnesium ions, copper ions and barium ions and preparation method thereof |
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Application publication date: 20151209 |