CN114394681B - Seawater desalination scale inhibitor and application thereof - Google Patents
Seawater desalination scale inhibitor and application thereof Download PDFInfo
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- 239000002455 scale inhibitor Substances 0.000 title claims abstract description 91
- 239000013535 sea water Substances 0.000 title claims abstract description 58
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 30
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000004094 surface-active agent Substances 0.000 claims abstract description 31
- 229920001529 polyepoxysuccinic acid Polymers 0.000 claims abstract description 26
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 21
- 229920000642 polymer Polymers 0.000 claims abstract description 20
- 229910000073 phosphorus hydride Inorganic materials 0.000 claims abstract description 16
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims description 20
- 229920001577 copolymer Polymers 0.000 claims description 15
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 13
- 229920000570 polyether Polymers 0.000 claims description 13
- LMHAGAHDHRQIMB-UHFFFAOYSA-N 1,2-dichloro-1,2,3,3,4,4-hexafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(Cl)C1(F)Cl LMHAGAHDHRQIMB-UHFFFAOYSA-N 0.000 claims description 12
- 229920000058 polyacrylate Polymers 0.000 claims description 12
- 239000004584 polyacrylic acid Substances 0.000 claims description 11
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- BAERPNBPLZWCES-UHFFFAOYSA-N (2-hydroxy-1-phosphonoethyl)phosphonic acid Chemical compound OCC(P(O)(O)=O)P(O)(O)=O BAERPNBPLZWCES-UHFFFAOYSA-N 0.000 claims description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 6
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 150000001298 alcohols Chemical class 0.000 claims description 2
- 230000005764 inhibitory process Effects 0.000 abstract description 30
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052796 boron Inorganic materials 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 239000011574 phosphorus Substances 0.000 abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 230000001143 conditioned effect Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 6
- 239000004327 boric acid Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000003651 drinking water Substances 0.000 description 3
- 235000020188 drinking water Nutrition 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- -1 alcohol compound Chemical class 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003621 irrigation water Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001704 evaporation 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
- 238000001914 filtration Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/04—Surfactants, used as part of a formulation or alone
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention provides a seawater desalination scale inhibitor, which comprises, by mass, 68-90 parts of acrylic acid polymer, 5-15 parts of polyepoxysuccinic acid, 3-10 parts of organic phosphine polymer, 0.2-2 parts of surfactant and 0-5 parts of alcohol. The scale inhibitor for sea water desalination solves the problem that the reverse osmosis sea water desalination system is high in alkalinity and easy to scale during the boron removal treatment. The scale inhibitor provided by the invention is simple to prepare, low in phosphorus content and small in dosage, and the obtained scale inhibition effect is good, so that the scale inhibitor has high industrial value and good environmental protection benefit.
Description
Technical Field
The invention relates to the field of reverse osmosis scale inhibitors for seawater desalination, in particular to a reverse osmosis scale inhibitor for seawater desalination aiming at high alkalinity.
Background
The trace element boron is an indispensable nutrient element for organisms, particularly plants, but boric acid also causes harm to the environment, human bodies, animals and plants. Meanwhile, boron also has certain harm in industrial production. The world health organization prescribes that the concentration of boric acid in domestic water cannot exceed 0.5mg/L, the concentration of boric acid in agricultural irrigation water cannot be higher than 1.0mg/L, and the national standard for quality of domestic drinking water (GB 5749-2006) prescribes that the concentration of boric acid in human drinking water cannot exceed 0.5mg/L.
Under the background of global water resource shortage and increasingly serious water pollution, the sea water desalination is a novel water making and saving technology, can alleviate the problem of serious shortage of fresh water resources, and is widely popularized and applied in coastal areas of the world and China. Among them, reverse osmosis seawater desalination plays an increasingly important role as one of the mainstream technologies for seawater desalination. The average content of boric acid in seawater is about 5mg/L, which is far higher than the national standard of plant irrigation water and human drinking water, and how to remove boron in seawater becomes an increasingly important problem, as boric acid molecules are uncharged and have small molecular diameters, and are difficult to separate and remove, the alkalinity of water body has great influence on boron removal, and the higher the alkalinity is, the higher the adsorption rate is, so in practical application, the boron removal process often needs to adjust the alkalinity of water body, but the alkalinity of water body is increased, and CaCO is often caused at the same time 3 Is easier to precipitate out, pollutes a reverse osmosis membrane, and reduces the seawater desalination efficiency. Therefore, how to prevent the pollution and scaling of the membrane surface is a problem to be solved in the sea water desalination condition.
Disclosure of Invention
The technical problems existing in the prior art are as follows: the seawater alkalinity is higher due to the boron removal treatment in the reverse osmosis seawater desalination system, and the high alkalinity promotes CaCO 3 More easily precipitates and separates out, pollutes a permeable membrane, and reduces the seawater desalination efficiency, so that a high-efficiency seawater desalination scale inhibitor aiming at the situation is needed.
In order to solve the problem of easier scaling under the high alkalinity condition in the sea water desalination process, the action mechanism of improving the scale inhibition dispersion property by combining multiple angles is provided 3 The seawater desalination scale inhibitor has higher scale inhibition rate.
Specifically, the invention provides the following technical scheme:
the seawater desalination scale inhibitor is characterized by comprising, by mass, 68-90 parts of acrylic acid polymer, 5-15 parts of polyepoxysuccinic acid, 3-10 parts of organic phosphine polymer, 0.2-2 parts of surfactant and 0-5 parts of alcohol.
Preferably, the scale inhibitor contains 80 to 90 parts of acrylic polymer, 5 to 13 parts of polyepoxysuccinic acid, 3 to 5 parts of organic phosphine polymer, 0.2 to 0.5 part of surfactant and 2 to 5 parts of alcohol.
Further preferably, the scale inhibitor contains 80 to 85 parts of acrylic polymer, 10 to 13 parts of polyepoxysuccinic acid, 4.5 to 5 parts of organic phosphine polymer, 0.2 to 0.5 part of surfactant and 2 parts of alcohol.
Preferably, the acrylic acid polymer is selected from one or more than two of polyacrylic acid, acrylic acid-methyl acrylate copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and acrylic acid-hydroxypropyl acrylate copolymer.
Further preferably, the molecular weight of the acrylic polymer is 1000 to 8000.
More preferably, the acrylic polymer has a molecular weight of 2000 to 5000.
Preferably, the polyepoxysuccinic acid is a polyepoxysuccinic acid suitable for use in acidic conditions.
Preferably, the organic phosphine polymer is selected from one or more than two of 2-hydroxyphosphonoacetic acid, 2-phosphonobutane-1, 2, 4-tricarboxylic acid and hydroxyethylidene diphosphonic acid.
Further preferred, the organophosphonic polymer is selected from 2-hydroxyphosphonoacetic acid or hydroxyethylidene diphosphonic acid.
Preferably, the surfactant is a polyether surfactant.
More preferably, the polyether surfactant has a molecular weight of 2500 to 3500.
Preferably, the alcohol compound is selected from one or more of methanol, ethanol, isopropanol and tert-butanol.
Further preferably, the alcohol compound is ethanol.
The preparation method of the seawater desalination scale inhibitor is characterized by comprising the following steps:
firstly mixing a surfactant with alcohols, and then adding an acrylic polymer, an organic phosphine polymer and polyepoxysuccinic acid to be uniformly mixed to obtain the scale inhibitor.
The scale inhibitor for sea water desalination is applied to the field of sea water desalination reverse osmosis.
Preferably, the adding amount of the seawater desalination scale inhibitor in the seawater intake system is 0.1-2 mg/L.
Further preferably, the adding amount of the seawater desalination scale inhibitor in the seawater intake system is 0.5-1.0 mg/L.
The beneficial effects of the invention include:
1. under the coordination of the surfactant, the molecular weight is controlled, the proportion is adjusted, when the using amount of the scale inhibitor is 0.75mg/L, the seawater with preset alkalinity is concentrated at 50 ℃ for 2.0 times of scale inhibition experiment, and CaCO is treated 3 The scale inhibition rate of the catalyst can reach more than 91.9%, and the delta A value is less than 0.18; when the concentration of the scale inhibitor is as low as 0.5mg/L, the scale inhibition rate can still reach more than 90 percent, the delta A value is below 0.20, and the scale inhibitor is suitable for CaCO 3 Has better scale inhibition effect.
2. The seawater desalination scale inhibitor disclosed by the invention is low in phosphorus, environment-friendly, low in dosage and good in scale inhibition effect; the preparation method is simple, has low cost, is favorable for popularization and application, and has good economic prospect and social benefit.
Detailed Description
According to the research of the invention, the molecular weight of the acrylic acid polymer has a large influence on the scale inhibition performance, when the molecular weight of the polymer is low, the relative number of coordination groups capable of undergoing a complexation reaction is small, and the capability of chelating calcium ions is obviously insufficient, but when the molecular weight is too large, the polymer molecule can be in a spiral state, so that active groups are wrapped in the polymer molecule, the reactivity is reduced, the scale inhibition effect is reduced, and the problem of blocking a film is easily caused by the too large molecular weight. The acrylic polymer is combined with a small amount of polyepoxysuccinic acid and an organic phosphine polymer, and the CaCO is inhibited under the coordination effect of the surfactant 3 Scaling has a significant synergistic effect. And the reverse osmosis seawater desalination system with higher alkalinity is obtained through molecular weight control and proportioning adjustmentThe low-phosphorus scale inhibitor has better scale inhibition effect.
As described above, the object of the present invention is: providing a CaCO pair 3 The seawater desalination scale inhibitor has higher scale inhibition rate.
Wherein, in a specific embodiment of the invention, a seawater desalination scale inhibitor is provided, which comprises 68 to 90 parts of acrylic acid polymer, 5 to 15 parts of polyepoxysuccinic acid, 3 to 10 parts of organic phosphine polymer, 0.2 to 2 parts of surfactant and 0 to 5 parts of alcohol by mass.
In still another embodiment of the present invention, a method for preparing a scale inhibitor for desalination of sea water is provided, comprising the following steps:
firstly mixing a surfactant with alcohol, and then adding an acrylic polymer, an organic phosphine polymer and polyepoxysuccinic acid to be uniformly mixed to obtain the scale inhibitor.
The sources of reagents and instrumentation used in the following examples and comparative examples are as follows:
table 1 list of instruments/reagents used in the examples
The scale inhibition test is operated according to the following steps:
adding NaOH into seawater to adjust pH to 9.5 (alkalinity to above 200 mg/L), adding antisludging agent into 500mL of seawater with pH adjusted, performing constant-temperature water bath treatment at 50deg.C, starting timing, evaporating and concentrating to about 250mL, covering a surface dish, keeping constant temperature for 24h, taking out, and cooling to room temperature. Transferring to a 250mL volumetric flask, fixing volume to scale, shaking, and filtering with medium speed filter paper. The obtained filtrate is measured for the concentration and alkalinity of calcium ions, the scale inhibition rate eta is calculated, and the difference delta A between the concentration multiple of chloride ions and the concentration multiple of alkalinity is calculated.
Wherein, the determination of the content of calcium ions, the determination of the content of chloride ions and the determination of the alkalinity are carried out according to the national standard GB/T34550.2-2017 of the national standard of the people's republic of China, part 2 of the method for evaluating the performance of seawater cooling water treatment medicament: the method for testing the scale inhibition performance in the test.
The calculation of the scale inhibition rate (eta) and the delta A is based on the national standard GB/T34550.2-2017 of the people's republic of China.
The scale inhibition (η) is calculated according to the following formula:
ρ Ca1 : adding scale inhibitor to concentrate Ca in seawater 2+ Ion concentration in mg/L;
ρ Ca0 : concentration of Ca in seawater without scale inhibitor 2+ Ion concentration in mg/L;
ρ Ca2 : ca in seawater 2+ Ion concentration in mg/L;
n: represents the concentration multiple of chloride ions, n=2 in the present invention.
Δa is calculated according to the following formula:
ρ Cl1 : concentrating seawater Cl - Ion concentration in mg/L;
ρ Cl2 : cl in seawater - Ion concentration in mg/L;
ρ M1 : the alkalinity of the concentrated seawater is in mg/L;
ρ M2 : the alkalinity of seawater is in mg/L.
The following examples are given in further detail, but the scope of the present invention is not limited to the specific examples.
Example 1
Dissolving 0.05g of polyether surfactant in 0.20g of ethanol, adding 8.5g of polyacrylic acid, uniformly mixing, adding 0.45g of 2-hydroxyphosphonoacetic acid, uniformly mixing, finally adding 1.0g of polyepoxysuccinic acid, and uniformly mixing to obtain the scale inhibitor.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor is respectively used at the dosage of 0.5mg/L and 0.75mg/L, the scale inhibition rate is respectively 90.7 percent and 98.8 percent, the delta A is respectively 0.20 and 0.06, and the CaCO can be effectively inhibited 3 Scaling.
Example 2
0.02g of polyether surfactant is dissolved in 0.20g of ethanol, 8.0g of acrylic acid-methyl acrylate copolymer is added, the mixture is uniformly mixed, 0.50g of 2-hydroxyphosphonoacetic acid is added, the mixture is uniformly mixed, and finally 1.28g of polyepoxysuccinic acid is added, and the scale inhibitor is obtained after uniform mixing.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor has 94.2 percent of scale inhibition rate and 0.08 of delta A when the dosage of the scale inhibitor is 0.75mg/L, and can effectively inhibit CaCO 3 Scaling.
Example 3
0.02g of polyether surfactant is dissolved in 0.20g of ethanol, 9.0g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is added, the mixture is uniformly mixed, then 0.3g of 2-hydroxyphosphonoacetic acid is added, the mixture is uniformly mixed, and finally 0.5g of polyepoxysuccinic acid is added, and the scale inhibitor is obtained after uniform mixing.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor has 93.0 percent of scale inhibition rate and 0.09 of delta A when the dosage of the scale inhibitor is 0.75mg/L, and can effectively inhibit CaCO 3 Scaling.
Example 4
0.2g of polyether surfactant is dissolved in 0.5g of ethanol, 6.8g of acrylic acid-hydroxypropyl acrylate copolymer is added, the mixture is uniformly mixed, 1.0g of hydroxyethylidene diphosphonic acid is added, the mixture is uniformly mixed, and finally 1.5g of polyepoxysuccinic acid is added, and the scale inhibitor is obtained after uniform mixing.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor has 93.0 percent of scale inhibition rate and 0.13 of delta A when the dosage of the scale inhibitor is 0.75mg/L, and can effectively inhibit CaCO 3 Scaling.
Example 5
Dissolving 0.05g of polyether surfactant in 0.20g of ethanol, adding 8.5g of polyacrylic acid (molecular weight is more than 10000), uniformly mixing, adding 0.45g of 2-hydroxyphosphonoacetic acid, uniformly mixing, finally adding 1.0g of polyepoxysuccinic acid, and uniformly mixing to obtain the scale inhibitor.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor has 91.9 percent of scale inhibition rate and 0.18 of delta A when the dosage of the scale inhibitor is 0.75 mg/L.
Comparative example 1
Only polyacrylic acid was used as a scale inhibitor.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor is 89.5% when the dosage of the scale inhibitor is 0.75mg/L, and the delta A is 0.21.
Comparative example 2
8.5g polyacrylic acid and 1.0g polyepoxysuccinic acid are taken and evenly mixed, 0.7g water is added, and the scale inhibitor is obtained after even mixing.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor is respectively used at the dosage of 0.5mg/L and 0.75mg/L, the scale inhibition rates are respectively 53.5 percent and 86.0 percent, and the delta A is respectively 0.89 and 0.23.
Comparative example 3
8.5g polyacrylic acid and 0.45g 2-hydroxy phosphonoacetic acid are taken and evenly mixed, and 1.25g water is added, and the scale inhibitor is obtained after even mixing.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor has the scale inhibition rate of 83.7% and the delta A of 0.22 when the dosage of the scale inhibitor is 0.75 mg/L.
Comparative example 4
Taking 0.20g of ethanol, adding 8.5g of polyacrylic acid, uniformly mixing, adding 0.45g of 2-hydroxyphosphonoacetic acid, uniformly mixing, finally adding 1.0g of polyepoxysuccinic acid, adding 0.05g of water, and uniformly mixing to obtain the scale inhibitor.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor has 91.9 percent of scale inhibition rate and 0.20 of delta A when the dosage of the scale inhibitor is 0.75 mg/L.
Comparative example 5
Dissolving 0.05g of polyether surfactant in 0.20g of ethanol, adding 4.0g of polyacrylic acid, uniformly mixing, adding 0.45g of 2-hydroxyphosphonoacetic acid, uniformly mixing, finally adding 1.0g of polyepoxysuccinic acid, adding 4.5g of water, and uniformly mixing to obtain the scale inhibitor.
When the pH value of the pre-conditioned seawater is 9.5 and the concentration is 2 times under the condition of 50 ℃, the scale inhibitor is 57.0% when the dosage of the scale inhibitor is 0.75mg/L, and the delta A is 0.54.
The evaluation results of the scale inhibition ratios of the scale inhibitors of the respective examples and comparative examples are summarized in table 2 below.
TABLE 2 evaluation results of scale inhibition ratio of scale inhibitor
As can be seen from the above table, the scale inhibitors obtained in examples 1 to 5 were effective against CaCO when the scale inhibitor concentration was 0.75mg/L 3 The scale inhibition rate (eta) is more than 91.9 percent, and the delta A value is less than 0.18; when the concentration of the scale inhibitor is as low as 0.5mg/L, the scale inhibition rate (eta) can still reach more than 90 percent, the delta A value is below 0.20, and the scale inhibitor is suitable for CaCO 3 Has better scale inhibition effect.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (24)
1. The seawater desalination scale inhibitor is characterized by comprising, by mass, 68-90 parts of acrylic acid polymer, 5-15 parts of polyepoxysuccinic acid, 3-10 parts of organic phosphine polymer, 0.2-2 parts of surfactant and 0-5 parts of alcohol;
wherein the molecular weight of the acrylic acid polymer is 1000-8000.
2. The scale inhibitor according to claim 1, wherein the scale inhibitor comprises, in parts by mass, 80 to 90 parts of an acrylic polymer, 5 to 13 parts of polyepoxysuccinic acid, 3 to 5 parts of an organic phosphine polymer, 0.2 to 0.5 parts of a surfactant and 2 to 5 parts of an alcohol.
3. The scale inhibitor according to claim 1, wherein the scale inhibitor comprises, in parts by mass, 80 to 85 parts of an acrylic polymer, 10 to 13 parts of polyepoxysuccinic acid, 4.5 to 5 parts of an organic phosphine polymer, 0.2 to 0.5 parts of a surfactant and 2 parts of an alcohol.
4. The scale inhibitor according to claim 1, wherein the acrylic acid polymer is one or more selected from the group consisting of polyacrylic acid, acrylic acid-methyl acrylate copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and acrylic acid-hydroxypropyl acrylate copolymer.
5. The scale inhibitor according to claim 2, wherein the acrylic acid polymer is one or more selected from the group consisting of polyacrylic acid, acrylic acid-methyl acrylate copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and acrylic acid-hydroxypropyl acrylate copolymer.
6. A scale inhibitor according to claim 3, wherein the acrylic acid polymer is selected from one or more of polyacrylic acid, acrylic acid-methyl acrylate copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and acrylic acid-hydroxypropyl acrylate copolymer.
7. The scale inhibitor of claim 1, wherein the acrylic polymer has a molecular weight of 2000-5000.
8. The scale inhibitor according to claim 4, wherein the acrylic polymer has a molecular weight of 2000 to 5000.
9. The scale inhibitor of claim 1, wherein the polyepoxysuccinic acid is polyepoxysuccinic acid suitable for use in acidic conditions.
10. The scale inhibitor of claim 4, wherein the polyepoxysuccinic acid is polyepoxysuccinic acid suitable for use in acidic conditions.
11. The scale inhibitor according to claim 1, wherein the organic phosphine polymer is one or more selected from the group consisting of 2-hydroxyphosphonoacetic acid, 2-phosphonobutane-1, 2, 4-tricarboxylic acid, and hydroxyethylidene diphosphonic acid.
12. The scale inhibitor according to claim 4, wherein the organic phosphine polymer is one or more selected from the group consisting of 2-hydroxyphosphonoacetic acid, 2-phosphonobutane-1, 2, 4-tricarboxylic acid, and hydroxyethylidene diphosphonic acid.
13. The scale inhibitor according to claim 9, wherein the organic phosphine polymer is one or more selected from the group consisting of 2-hydroxyphosphonoacetic acid, 2-phosphonobutane-1, 2, 4-tricarboxylic acid, and hydroxyethylidene diphosphonic acid.
14. The scale inhibitor of claim 1, wherein the surfactant is a polyether surfactant.
15. The scale inhibitor according to claim 4, wherein the surfactant is a polyether surfactant.
16. The scale inhibitor of claim 9, wherein the surfactant is a polyether surfactant.
17. The scale inhibitor of claim 11, wherein the surfactant is a polyether surfactant.
18. The scale inhibitor of any of claims 14-17, wherein the polyether surfactant has a molecular weight of 2500-3500.
19. The scale inhibitor of any one of claims 1-17, wherein the alcohol is selected from one or more of methanol, ethanol, isopropanol, and t-butanol.
20. The scale inhibitor of claim 18, wherein the alcohol is selected from one or more of methanol, ethanol, isopropanol, and t-butanol.
21. A method of preparing a scale inhibitor according to any one of claims 1 to 20, comprising the steps of:
firstly mixing a surfactant with alcohols, and then adding an acrylic polymer, an organic phosphine polymer and polyepoxysuccinic acid to be uniformly mixed to obtain the scale inhibitor.
22. Use of the scale inhibitor of any one of claims 1 to 20 or the scale inhibitor obtained by the preparation method of claim 21 in the field of reverse osmosis for desalination of sea water.
23. The use according to claim 22, wherein the scale inhibitor is added in an amount of 0.1-2 mg/L in a seawater intake system.
24. The use of claim 22, wherein the scale inhibitor is added in an amount of 0.5-1 mg/L to the seawater intake system.
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