CN110066027B - Phosphorus-free corrosion and scale inhibitor composition, phosphorus-free corrosion and scale inhibitor and application thereof - Google Patents
Phosphorus-free corrosion and scale inhibitor composition, phosphorus-free corrosion and scale inhibitor and application thereof Download PDFInfo
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- CN110066027B CN110066027B CN201810064266.0A CN201810064266A CN110066027B CN 110066027 B CN110066027 B CN 110066027B CN 201810064266 A CN201810064266 A CN 201810064266A CN 110066027 B CN110066027 B CN 110066027B
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- 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
- C02F5/105—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 combined with inorganic substances
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- 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
- C02F5/12—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 nitrogen
- C02F5/125—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 nitrogen combined with inorganic substances
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- 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
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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Abstract
The invention relates to the field of corrosion and scale inhibitors, and discloses a phosphorus-free corrosion and scale inhibitor composition, wherein the composition contains a polymer A, a polymer B, organic acid and/or organic acid salt and water-soluble inorganic zinc salt; the polymer A is a copolymer of maleic anhydride and allyloxy polyoxyethylene maleic acid monoester, and the polymer B is a corrosion inhibition polymer; the weight ratio of the polymer A, the polymer B, the organic acid and/or the organic acid salt to the water-soluble inorganic zinc salt is 1 (0.3-6.67): (0.025-1.25): 0.05-1.6). The invention also provides a phosphorus-free corrosion and scale inhibitor and application thereof. The phosphorus-free corrosion and scale inhibitor composition provided by the invention effectively reduces the consumption of corrosion inhibitors and greatly saves the cost.
Description
Technical Field
The invention relates to a phosphorus-free corrosion and scale inhibitor composition, a phosphorus-free corrosion and scale inhibitor and application thereof.
Background
The corrosion and scale inhibitor formula used in cooling water treatment in China is mainly a phosphorus-based formula, and although the performance of the corrosion and scale inhibitor formula can basically meet the use requirements, the phosphorus-based formula still has the following defects: the phosphorus water treatment agent has the hidden trouble of easily forming phosphate scale in the using process, and influences the heat exchange effect of the water cooler during long-term operation; the phosphorus formula promotes the propagation of microorganisms in the circulating water, and a large amount of bactericide is consumed; the discharge of a large amount of phosphorus easily causes eutrophication of the receiving water body. Therefore, the development and use of the low-phosphorus or phosphorus-free corrosion and scale inhibitor formula have important significance for cooling water treatment.
The scale inhibition performance of the corrosion and scale inhibitor compound formula on circulating water mainly reflects three aspects of calcium carbonate scale inhibition, phosphorus scale inhibition and zinc scale inhibition. With the gradual popularization of sewage recycling, a certain amount of phosphorus is inevitably contained in circulating water, so that even if a phosphorus-free formula is used, the phosphorus-free formula also has a certain phosphorus and scale inhibition capacity. The scale inhibitor single agent of the phosphorus-free corrosion and scale inhibitor compound formula mainly uses synthesized water-soluble phosphorus-free polymers, but the scale inhibition performance of different water-soluble phosphorus-free polymers is greatly different. Polyacrylic acid (PAA), maleic acid-acrylic acid copolymer (MA-AA), hydrolyzed polymaleic anhydride (HPMA), polyepoxysuccinic acid (PESA), Polyaspartic Acid (PASP), and the like have strong calcium carbonate scale resistance and weak phosphorus scale resistance and zinc scale resistance; the calcium carbonate scale resistance, the phosphorus scale resistance and the zinc scale resistance of acrylic acid-acrylate copolymers, acrylic acid and hydroxypropyl acrylate copolymers (AA-HPA, T-225) and the like are strong; the calcium carbonate scale resistance, the phosphorus scale resistance and the zinc scale resistance of acrylic acid-acrylate-sulfonate copolymer, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS) and the like are strong; the phosphorus scale and zinc scale resistance of the allyloxy polyethoxy sulfonate copolymer (AA-APES), the acrylic acid and 3-allyloxy-2-hydroxy propane sulfonic acid copolymer (AA-AHPSE) and the like is strong, and the calcium carbonate scale resistance is weak.
In the synthesized water-soluble phosphorus-free polymer, hydrolyzed polymaleic anhydride (HPMA), polyepoxysuccinic acid (PESA), Polyaspartic Acid (PASP) and the like have certain corrosion inhibition capacity, and polyacrylic acid (PAA), maleic acid-acrylic acid copolymer (MA-AA), acrylic acid-acrylate copolymer, acrylic acid and hydroxypropyl acrylate copolymer (AA-HPA, T-225), acrylic acid-acrylate-sulfonate copolymer, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS), allyloxy polyethoxylate sulfonate copolymer (AA-APES), acrylic acid and 3-allyloxy-2-hydroxypropanesulfonic acid copolymer (AA-AHPSE) and the like can not inhibit corrosion but promote corrosion.
CN 102225809A discloses an ascorbic acid non-phosphorus corrosion and scale inhibitor suitable for industrial cooling circulating cooling water, which comprises the following components in percentage by mass: 15 to 20 percent of hydrolyzed polymaleic acid, 10 to 15 percent of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid, 0.6 to 1 percent of ascorbic acid, 0.5 to 1 percent of sulfamic acid, 10 to 15 percent of zinc nitrate or zinc sulfate, 10 to 15 percent of D-sodium glucose or D-potassium glucose, and the balance of distilled water. Both acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid copolymer materials promote corrosion, and to counteract the increased amount of corrosion caused by these materials, the amount of corrosion inhibitor used in the formulation must be increased, resulting in increased use costs.
Disclosure of Invention
The invention aims to provide a phosphorus-free corrosion and scale inhibitor composition capable of providing a corrosion inhibition effect, a corrosion and scale inhibitor and application thereof.
In order to achieve the above objects, according to a first aspect of the present invention, there is provided a phosphorus-free corrosion and scale inhibitor composition, wherein the composition comprises a polymer a, a polymer B, an organic acid and/or organic acid salt, and a water-soluble inorganic zinc salt; the polymer A is a copolymer of maleic anhydride and allyloxy polyoxyethylene maleic acid monoester, and the polymer B is a corrosion inhibition polymer; the weight ratio of the polymer A, the polymer B, the organic acid and/or the organic acid salt to the water-soluble inorganic zinc salt is 1 (0.3-6.67): (0.025-1.25): 0.05-1.6).
According to a second aspect of the present invention, the present invention provides a phosphorus-free corrosion and scale inhibitor, which comprises a phosphorus-free corrosion and scale inhibitor composition and water, wherein the phosphorus-free corrosion and scale inhibitor composition is the phosphorus-free corrosion and scale inhibitor composition of the present invention.
According to a third aspect of the invention, the invention provides the application of the phosphorus-free corrosion and scale inhibitor in treating circulating cooling water.
The inventor of the invention finds that the polymer A (the copolymer of maleic anhydride and allyloxy polyoxyethylene maleic acid monoester) has a corrosion inhibition effect, the dosage of the corrosion inhibitor in the composition can be effectively reduced according to the formula of the invention on the premise of not influencing the treatment effect, the cost is greatly saved, and the polymer A, the polymer B, the organic acid and/or organic acid salt and the water-soluble inorganic zinc salt in the formula of the invention have a synergistic effect, so that the dosage of each single agent is reduced, and the operation cost is reduced. Moreover, the corrosion and scale inhibitor is a phosphorus-free system according to the formula of the invention, thereby avoiding eutrophication of the receiving water body caused by phosphorus discharge.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, "at least one" means one or a mixture of two or more.
The invention provides a phosphorus-free corrosion and scale inhibitor composition, which comprises a polymer A, a polymer B, an organic acid and/or an organic acid salt and a water-soluble inorganic zinc salt. The polymer A is a copolymer of maleic anhydride and allyloxy polyoxyethylene maleic acid monoester, and the polymer B is a corrosion inhibition polymer; the weight ratio of the polymer A, the polymer B, the organic acid and/or the organic acid salt to the soluble inorganic zinc salt is 1 (0.3-6.67): (0.025-1.25): 0.05-1.6). The phosphorus-free corrosion and scale inhibitor composition does not contain phosphorus-containing compounds.
According to the present invention, in order to further improve the corrosion inhibition effect, it is preferable that the weight ratio of the polymer A, the polymer B, the organic acid and/or the organic acid salt to the water-soluble inorganic zinc salt is 1 (0.75-3): 0.1-0.45): 0.16-0.63.
According to the present invention, in order to further enhance the corrosion inhibition effect, the weight average molecular weight of the polymer a is preferably 1000-.
In the present invention, the polymer a, i.e. the copolymer of maleic anhydride and allyloxypolyoxyethylene maleic acid monoester, can be prepared, and in one embodiment of the present invention, the polymer a is preferably prepared according to the following steps:
the Maleic Anhydride (MA) and allyloxy polyoxyethylene ether are used as raw materials and are prepared by two steps of reactions of esterification and polymerization, and the method specifically comprises the following steps:
(1) esterification reaction: under the esterification condition, maleic anhydride and allyloxy polyoxyethylene ether are mixed for esterification reaction to obtain allyloxy polyoxyethylene maleic acid monoester (APEM). The esterification reaction conditions generally include a reaction temperature and a reaction time, wherein the reaction temperature may be 70 to 120 ℃, more preferably 80 to 100 ℃ and the reaction time may be 1 to 6 hours from the viewpoint of promoting the esterification reaction in equilibrium and improving the reaction efficiency. The mass ratio of maleic anhydride to allyloxypolyoxyethylene ether is preferably 1: 0.9-1.1.
(2) Polymerization reaction: under the polymerization reaction condition, in a Maleic Anhydride (MA) solution, an initiator is contacted with prepared allyloxy polyoxyethylene maleic acid monoester (APEM) for polymerization reaction, and a copolymer of maleic anhydride and allyloxy polyoxyethylene maleic acid monoester (MA-APEM copolymer for short) is obtained and can be used as a corrosion inhibitor. The specific contact mode can be as follows: and (2) respectively or simultaneously dripping (preferably simultaneously dripping) an initiator and the allyloxypolyoxyethylene maleic acid monoester (APEM) prepared in the step (1) into a Maleic Anhydride (MA) solution to carry out polymerization reaction. The polymerization conditions generally include a reaction temperature and a reaction time, wherein the reaction temperature is preferably 75 to 100 ℃ and the reaction time is preferably 2 to 5 hours from the viewpoint of promoting the polymerization reaction in equilibrium and improving the reaction efficiency.
In the invention, in the esterification reaction stage, the allyloxy polyoxyethylene ether preferably has a weight average molecular weight of 230-2500, i.e., the vinyl ether repeating unit is 4-55, and more preferably, the allyloxy polyoxyethylene ether has a weight average molecular weight of 320-1100, i.e., the vinyl ether repeating unit is 6-24.
In the invention, in the polymerization reaction stage, the mass ratio of MA to APEM is 5:95-95:5, preferably 10:90-75:25, the initiator is preferably one or more of ammonium persulfate, sodium persulfate and potassium persulfate, the addition amount (mass) of the initiator is preferably 2-12% of the sum of the mass of MA and APEM, more preferably 3-8%, and the selection can be specifically carried out according to the required weight average molecular weight of the copolymer.
In the present invention, the sum of the mass of MA, APEM and initiator is preferably 10 to 50%, more preferably 20 to 40% of the total mass of the solution.
The copolymer of maleic anhydride and allyloxypolyoxyethylene maleic acid monoester used in the embodiment of the invention uses Maleic Anhydride (MA) and allyloxypolyoxyethylene ether with the weight-average molecular weight of 500 as raw materials for esterification reaction, the reaction temperature is 85 ℃, the reaction time is 4h, and the allyloxypolyoxyethylene maleic acid monoester (APEM) is obtained by the esterification reaction; APEM and MA in a mass ratio of 5:95-95:5 are subjected to polymerization reaction in the presence of an initiator, and polymerization reaction conditions and the amount of the initiator are adjusted according to different weight average molecular weights, so that the MA-APEM copolymer with the optimal weight average molecular weight required by the invention is obtained.
According to the present invention, the polymer B may be selected from a wide variety of polymers, and a non-phosphate corrosion inhibitor polymer may be used in the present invention, and in order to further improve the corrosion inhibition effect, it is preferable for the present invention that the polymer B is selected from at least one of Polyaspartic Acid (PASP), polyepoxysuccinic acid (PESA), and hydrolyzed polymaleic anhydride (HPMA).
According to the present invention, the organic acid is selected from a wide variety of organic acids, and in order to further improve the corrosion inhibition effect, it is preferable that the organic acid is at least one selected from ascorbic acid, dehydroascorbic acid, erythorbic acid, and dehydroerythorbic acid. The variety of the organic acid salt is wide, and the organic acid salt is preferably a gluconate salt, and may be at least one of sodium gluconate, potassium gluconate, sodium D-gluconate, potassium D-gluconate, zinc gluconate, and manganese gluconate, for example. Among them, most preferably, the organic acid and/or organic acid salt is an organic acid, and more preferably at least one of ascorbic acid, dehydroascorbic acid, erythorbic acid, and dehydroerythorbic acid.
According to the present invention, the water-soluble inorganic zinc salt may be various water-soluble inorganic zinc salts conventionally used in the field of water treatment agents, and particularly preferably one or more selected from zinc chloride, zinc sulfate and zinc nitrate, and particularly preferably zinc sulfate and/or zinc chloride. In the present invention, the water-soluble inorganic zinc salt generally means an inorganic zinc salt having a solubility in water (20 ℃ C., 1 atm) of more than 1% by weight.
The invention provides a phosphorus-free corrosion and scale inhibitor, which contains a phosphorus-free corrosion and scale inhibitor composition and water, wherein the phosphorus-free corrosion and scale inhibitor composition is the phosphorus-free corrosion and scale inhibitor composition.
The corrosion and scale inhibitor of the present invention preferably contains 25 to 85 wt%, more preferably 30 to 80 wt%, and even more preferably 48 to 72 wt% of the phosphorus-free corrosion and scale inhibitor composition, based on the total amount of the phosphorus-free corrosion and scale inhibitor; the content of water is 15 to 75% by weight, more preferably 20 to 70% by weight, and still more preferably 28 to 52% by weight.
The corrosion and scale inhibitor according to the present invention preferably contains, based on the total amount of the corrosion and scale inhibitor, 5 to 40 wt%, more preferably 10 to 30 wt%, polymer B15 to 40 wt%, more preferably 22.5 to 37.5 wt%, organic acid and/or organic acid salt 2.5 to 6 wt%, more preferably 3.3 to 5.6 wt%, water-soluble inorganic zinc salt 4 to 8 wt%, more preferably 4.8 to 7.9 wt%, and the balance being water.
The invention also provides application of the phosphorus-free corrosion and scale inhibitor in treatment of circulating cooling water.
According to the application of the invention, the non-phosphorus corrosion and scale inhibitor is preferably used in an amount of 70-140mg, more preferably 90-110mg, per liter of circulating cooling water.
According to the invention, the polymer A (the copolymer of maleic anhydride and allyloxy polyoxyethylene maleic acid monoester) has a corrosion inhibition effect, so that the dosage of the corrosion inhibitor in the composition can be effectively reduced on the premise of not influencing the treatment effect according to the formula of the invention, the cost is greatly saved, and the polymer A, the polymer B, the organic acid and/or organic acid salt and the water-soluble inorganic zinc salt in the formula of the invention have a synergistic effect, so that the dosage of each single agent is reduced, and the operation cost is reduced.
The present invention will be described in detail with reference to examples, but the present invention is not limited thereto.
The various starting materials used in the examples were all obtained commercially.
The method for detecting the corrosion inhibition performance and the scale inhibition performance of the corrosion and scale inhibitor in the embodiment and the comparative example refers to methods 401, 402, 403 and 404 in a cooling water analysis and test method (1993, published by the information center of the Anqing petrochemical industry general factory). Wherein, the dosage of the non-phosphorus corrosion and scale inhibitor is 100mg relative to each liter of Beijing tap water. The test water used in the examples and comparative examples of the present invention was Beijing tap water, the water quality is shown in Table 1, and the corrosion rate and scale inhibition rate are shown in Table 2.
TABLE 1 quality of Beijing-derived tap water
In the invention, the average corrosion rate is defined as the corrosion inhibition efficiency of the corrosion and scale inhibitor, and the calculation formula of the average corrosion rate is as follows:
in the formula: f-corrosion rate, mm/a;
c-calculation constant (8.76X 10)7)；
Delta W is corrosion weight loss, g, of the test piece;
a-area of the test piece, cm2；
T-corrosion test time, h;
rho-Density of the test piece Material, kg/dm3。
The calcium carbonate scale inhibition rate is defined as the calcium carbonate scale inhibition efficiency of the corrosion and scale inhibitor, and the calculation formula of the calcium carbonate scale inhibition rate is as follows:
in the formula: n-concentration multiple
Ca2+ 0Ca measured before test solution test2+Mass concentration, mg/L;
Ca2+ 1a test solution to which the medicament is added, the testCa after test2+Mass concentration, mg/L;
Ca2+ 2ca after test without addition of reagent test solution (blank)2+Mass concentration, mg/L.
The phosphorus scale inhibition rate is defined as the phosphorus scale inhibition efficiency of the corrosion and scale inhibitor, and the calculation formula of the phosphorus scale inhibition rate is as follows:
in the formula:
measured before the test solution test
Mass concentration, mg/L;
The zinc scale inhibition rate is defined as the zinc scale inhibition efficiency of the corrosion and scale inhibitor, and the calculation formula of the zinc scale inhibition rate is as follows:
in the formula:
zn measured before the test solution test2+Mass concentration, mg/L;
Example 1
4.8g of zinc chloride is weighed and placed in a 250mL beaker, 39.4g of deionized water is added, after stirring and dissolution, 30g of MA-APEM (weight average molecular weight 2000), 22.5g of HPMA (product number LH-10) and 3.3g of ascorbic acid are added and stirred uniformly.
Example 2
Weighing 7.9g of zinc sulfate, placing the zinc sulfate in a 250mL beaker, adding 29g of deionized water, stirring to dissolve, then adding 20g of MA-APEM (weight average molecular weight 10000), 37.5g of PASP (product number HL-157) and 5.6g of dehydroascorbic acid, and stirring uniformly.
Example 3
6.3g of zinc nitrate is weighed and placed in a 250mL beaker, 49.2g of deionized water is added, after stirring and dissolution, 10g of MA-APEM (weight average molecular weight 5500), 30g of PESA (commercial product number LH-158) and 4.5g of isoascorbic acid are added and stirred uniformly.
Example 4
Weighing 4g of zinc chloride, placing the zinc chloride in a 250mL beaker, adding 38.5g of deionized water, stirring to dissolve, then adding 40g of MA-APEM (weight average molecular weight 1000), 15g of PESA (commercial product number LH-158) and 2.5g of ascorbic acid, and stirring uniformly.
Example 5
6.25g of zinc sulfate is weighed and placed in a 250mL beaker, 51.25g of deionized water is added, after stirring and dissolution, 5g of MA-APEM (weight average molecular weight 14000), 32.5g of PASP (product number HL-157) and 5g of isoascorbic acid are added and stirred uniformly.
Comparative example 1
The ingredients and amounts were unchanged except that 30g of AA-AMPS was used instead of 30g of MA-APEM in example 1.
Comparative example 2
On the basis of comparative example 1, 4.8g of zinc chloride, 22.5g of HPMA and 3.3g of ascorbic acid were increased to 12g, 40g and 10g, respectively.
Comparative example 3
The ingredients and amounts were unchanged except that 30g of AA-APES was used instead of 30g of MA-APEM in example 1.
The corrosion and scale inhibitors obtained in examples 1 to 5 and comparative examples 1 to 3 were evaluated for corrosion and scale inhibition performance, respectively. The results are shown in Table 2.
TABLE 2
From the results shown in table 2, it can be seen that the corrosion and scale inhibitor formulated according to the present invention has a greatly reduced corrosion rate while ensuring the scale inhibition effect, whereas the amount of corrosion inhibitor used is required to be greatly increased if the corrosion and scale inhibitor formulated according to the prior art has a corrosion inhibition effect substantially consistent with the present invention, compared to comparative example 2. Therefore, the composition of the invention effectively reduces the dosage of the corrosion inhibitor and greatly saves the cost.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (17)
1. A phosphorus-free corrosion and scale inhibitor composition is characterized by comprising a polymer A, a polymer B, an organic acid and/or an organic acid salt and a water-soluble inorganic zinc salt; the polymer A is a copolymer of maleic anhydride and allyloxy polyoxyethylene maleic acid monoester, and the polymer B is a corrosion inhibition polymer; the weight ratio of the polymer A, the polymer B, the organic acid and/or the organic acid salt to the water-soluble inorganic zinc salt is 1 (0.3-6.67): (0.025-1.25): 0.05-1.6),
wherein, the allyloxy polyoxyethylene maleic acid monoester is obtained by mixing maleic anhydride and allyloxy polyoxyethylene ether and carrying out esterification reaction.
2. The composition as in claim 1, wherein the weight ratio of the polymer A, the polymer B, the organic acid and/or the organic acid salt to the water-soluble inorganic zinc salt is 1 (0.75-3): 0.1-0.45): 0.16-0.63.
3. The composition as claimed in claim 1, wherein the weight average molecular weight of the polymer a is 1000-.
4. The composition as claimed in claim 3, wherein the weight average molecular weight of the polymer A is 2000-10000.
5. The composition of any one of claims 1-4, wherein the polymer B is selected from at least one of polyaspartic acid, polyepoxysuccinic acid, and hydrolyzed polymaleic anhydride.
6. The composition of any one of claims 1-4, wherein the organic acid is selected from at least one of ascorbic acid, dehydroascorbic acid, erythorbic acid, and dehydroerythorbic acid, and the phosphorus-free organic acid salt is selected from at least one of sodium gluconate, potassium gluconate, sodium D-gluconate, potassium D-gluconate, zinc gluconate, and manganese gluconate.
7. The composition of claim 6, wherein the composition comprises polymer A, polymer B, an organic acid, and a water-soluble inorganic zinc salt.
8. The composition of any of claims 1-4, wherein the water soluble inorganic zinc salt is selected from at least one of zinc chloride, zinc sulfate, and zinc nitrate.
9. A non-phosphorus corrosion and scale inhibitor, which contains a non-phosphorus corrosion and scale inhibitor composition and water, and is characterized in that the non-phosphorus corrosion and scale inhibitor composition is the non-phosphorus corrosion and scale inhibitor composition in any one of claims 1 to 8.
10. The phosphorus-free corrosion and scale inhibitor according to claim 9, wherein the composition of the phosphorus-free corrosion and scale inhibitor comprises 25 to 85 wt% and 15 to 75 wt% of water, based on the total amount of the phosphorus-free corrosion and scale inhibitor.
11. The phosphorus-free corrosion and scale inhibitor of claim 10, wherein the composition of the phosphorus-free corrosion and scale inhibitor comprises 30-80 wt% and 20-70 wt% of water, based on the total amount of the phosphorus-free corrosion and scale inhibitor.
12. The phosphorus-free corrosion and scale inhibitor of claim 11, wherein the composition of the phosphorus-free corrosion and scale inhibitor comprises 48-72 wt% and 28-52 wt% of water, based on the total amount of the phosphorus-free corrosion and scale inhibitor.
13. The phosphorus-free corrosion and scale inhibitor according to any one of claims 9 to 12, wherein the content of the polymer a is 5 to 40 wt%, the content of the polymer B is 15 to 40 wt%, the content of the organic acid and/or organic acid salt is 2.5 to 6 wt%, the content of the water-soluble inorganic zinc salt is 4 to 8 wt%, and the balance is water, based on the total amount of the phosphorus-free corrosion and scale inhibitor.
14. The phosphorus-free corrosion and scale inhibitor according to claim 13, wherein the total amount of the corrosion and scale inhibitor is 10 to 30 wt% of the polymer a, 22.5 to 37.5 wt% of the polymer B, 3.3 to 5.6 wt% of the organic acid and/or organic acid salt, 4.8 to 7.9 wt% of the water-soluble inorganic zinc salt, and the balance of water.
15. The use of the phosphorus-free corrosion and scale inhibitor of any one of claims 9-14 in the treatment of recirculating cooling water.
16. The use according to claim 15, wherein the amount of the phosphorus-free corrosion and scale inhibitor is 70-140mg per liter of circulating water cooling water.
17. The use according to claim 16, wherein the amount of the phosphorus-free corrosion and scale inhibitor is 90-110mg per liter of circulating water cooling water.
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