CN114195275A - Phosphorus-free corrosion and scale inhibitor and preparation method thereof - Google Patents
Phosphorus-free corrosion and scale inhibitor and preparation method thereof Download PDFInfo
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- CN114195275A CN114195275A CN202111447036.0A CN202111447036A CN114195275A CN 114195275 A CN114195275 A CN 114195275A CN 202111447036 A CN202111447036 A CN 202111447036A CN 114195275 A CN114195275 A CN 114195275A
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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
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention provides a phosphorus-free corrosion and scale inhibitor and a preparation method thereof, wherein the phosphorus-free corrosion and scale inhibitor comprises a corrosion inhibition component and a scale inhibition component; wherein the corrosion inhibition component comprises the following components in parts by weight: 10-20% of polycarboxylate, 5-10% of polysulfonate, 5-10% of zinc salt, 0.5-1% of BTA, 5% of pH regulator and 5% of sodium gluconate, and the balance of deionized water; the scale inhibition component comprises the following components in parts by weight: 15-30% of polycarboxylate, 5-10% of polysulfonate, 5-10% of polycarboxylate, 3-5% of green scale inhibitor and the balance of deionized water. The phosphorus-free corrosion and scale inhibitor has the advantages of wide water quality application range, flexible adding mode, environmental protection, and reduction of the total amount of the medicament in the water body and environmental load when the phosphorus-free corrosion and scale inhibitor is used for water treatment while the operation cost of the system is reduced.
Description
Technical Field
The invention relates to the field of scale inhibitors, and in particular relates to a phosphorus-free corrosion and scale inhibitor and a preparation method thereof.
Background
The organophosphorus medicament is widely used in circulating water treatment as a main medicament for water treatment, the total phosphorus content (calculated by phosphorus simple substance) in the circulating water is generally controlled to be more than 3.0mg/L, and the double effects of corrosion inhibition and scale inhibition can be achieved, but the ecological damage caused by eutrophication of water body due to the discharge of a large amount of phosphorus in the treated circulating water is avoided, so that the national strict standard for phosphorus discharge is established, according to the GB8978-96 comprehensive sewage discharge standard, the total phosphorus (calculated by phosphorus simple substance) of all sewage discharge units in the primary discharge standard is less than 0.5mg/L, and the total phosphorus (calculated by phosphorus simple substance) of the secondary discharge standard is less than 1.0 mg/L. The non-phosphorization and environmental protection of the water treatment agent become the practical requirements and industry development trend of industrial enterprises.
The water treatment agent has higher operation cost, provides a phosphorus-free environment-friendly corrosion and scale inhibitor and reduces the cost, thereby being beneficial to coping with the increasingly severe environmental protection pressure of enterprises and improving the core competitiveness and influence of the water treatment.
Disclosure of Invention
The invention provides a phosphorus-free corrosion and scale inhibitor and a preparation method thereof, the water quality application range is wide, the adding mode is flexible, the environment is protected, and when the phosphorus-free corrosion and scale inhibitor is used for water treatment, the total amount of a medicament in a water body can be reduced and the environmental load is reduced while the operation cost of a system is reduced.
The technical scheme of the invention is that the phosphorus-free corrosion and scale inhibitor comprises a corrosion inhibition component and a scale inhibition component;
wherein the corrosion inhibition component comprises the following components in parts by weight: 10-20% of polycarboxylate, 5-10% of polysulfonate, 5-10% of zinc salt, 0.5-1% of BTA, 5% of pH regulator and 5% of sodium gluconate, and the balance of deionized water;
the scale inhibition component comprises the following components in parts by weight: 15-30% of polycarboxylate, 5-10% of polysulfonate, 5-10% of polycarboxylate, 3-5% of scale inhibitor and the balance of deionized water.
Further, the polycarboxylate of the corrosion inhibition component is HPMA or a modified compound thereof; the polycarboxylate of the scale inhibiting component is HPMA, PAA or a HPMA-modified compound, or a PAA-modified compound.
Further, the polysulfonate is a homopolymer or copolymer taking 2-acrylamide-2-methylpropanesulfonic acid as a monomer.
Further, the zinc salt is zinc sulfate or zinc chloride.
Further, the pH regulator is borax, tartaric acid or tartrate.
Further, the polycarboxylate is methyl ester or ethyl ester of HPMA, PAA and modified compounds thereof.
Further, the scale inhibitor in the scale inhibition component is one or more of PESA and PASP.
The invention also relates to a method for preparing the phosphorus-free corrosion and scale inhibitor, which comprises the following steps:
wherein, when the corrosion inhibition component is prepared:
s1, adding polycarboxylate and polysulfonate, adding partial deionized water to make the total mass reach 35% of the mass of single batch production, and stirring the materials to mix evenly.
S2, adding zinc salt and BTA, mixing uniformly, adding a pH regulator and sodium gluconate, and continuing stirring for 10-20 min.
S3, finally adding the rest deionized water under the stirring condition, and uniformly mixing to obtain the water-based paint;
when the scale inhibition component is prepared:
s1, adding polycarboxylate, polysulfonate and polycarboxylate, mixing uniformly, adding deionized water under the condition of stirring, and mixing uniformly;
s2, adding the scale inhibitor under the stirring condition, and uniformly mixing to obtain the scale inhibitor.
The invention also relates to the application of the phosphorus-free corrosion and scale inhibitor in water treatment, wherein the adding proportion of corrosion and scale inhibiting components is flexibly changed according to the running state of water quality and circulating water during water treatment.
Further, when the corrosion tendency of the system is obvious in the early operation stage of the system: the system runs by using an adding mode with low scale inhibition component proportion and high corrosion inhibition component proportion, the corrosion tendency of the system is gradually reduced along with the increase of the concentration multiple of the system, the scaling tendency is gradually increased, at the moment, the adding amount of the corrosion inhibition component is gradually reduced, and the adding amount of the corrosion inhibition component is increased.
The invention has the following beneficial effects:
1. the phosphorus-free corrosion and scale inhibitor is divided into two components, so that the stability of the medicament is improved, and the condition that zinc salts in the medicament corrosion inhibitor are incompatible with components in partial scale inhibitor is avoided. So that each component can be stably existed in the system for a long time. Meanwhile, a system which is more beneficial to dissolving and dispersing solid components of the corrosion inhibitor can be created in production by splitting the phosphorus-free corrosion and scale inhibitor, so that the production efficiency is improved.
2. At the initial stage of system operation, the corrosion tendency of the system is obvious, the consumption of the slow-release components by the system is obvious, and the slow release consumption is caused by corrosion inhibition and film formation. The increase of the concentration multiple of the system, the corrosion tendency of the system is gradually reduced, and the corrosion inhibition components such as zinc salt, BTA and the like in the system begin to accumulate. The addition of the corrosion inhibition component is reduced, so that the cost is saved, the risks of scaling and the like of corrosion inhibition components of zinc salt are reduced, and the improvement of the treatment effect of a system is facilitated.
3. By splitting the phosphorus-free corrosion and scale inhibitor into two components, the operation cost of the system can be effectively reduced when the phosphorus-free corrosion and scale inhibitor is used for water treatment, and meanwhile, the total amount of the medicament in the water body can be reduced by more accurate and effective addition, so that the environmental load is reduced.
Drawings
FIG. 1 is a graph of the scale inhibition rate of water in the application case.
FIG. 2 is a pH diagram of water in an application case.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Example 1:
a phosphorus-free corrosion and scale inhibitor: comprises a corrosion inhibition component and a scale inhibition component.
The corrosion inhibition component comprises the following components: 10g of PAA, 8.5g of 2-acrylamide-2-methylpropanesulfonic acid-acrylic acid copolymer, 10g of zinc chloride, 0.5g of BTA, 5g of borax, 5g of sodium gluconate and 61g of deionized water;
the scale inhibition component comprises the following components in parts by weight: 20g of PAA, 10g of 2-acrylamide-2-methylpropanesulfonic acid-acrylic acid copolymer, 10g of polymethyl acrylate, 2g of PESA, 2g of PASP and 56g of deionized water.
Wherein, when the corrosion inhibition component is prepared:
s1, adding PAA, 2-acrylamide-2-methylpropanesulfonic acid-acrylic acid copolymer and a small amount of ionized water to ensure that the total mass reaches 35% of the mass of a single batch of production, and stirring for about 10min to ensure that the materials are uniformly mixed.
S2, adding zinc salt (zinc chloride) and BTA, stirring for 10min, adding pH regulator borax and sodium gluconate, and stirring for 20 min.
And S3, adding the rest deionized water under the stirring condition, continuously stirring for 40min, and canning.
When the scale inhibition component is prepared:
s1, adding polycarboxylate PAA, polysulfonate 2-acrylamide-2-methylpropanesulfonic acid-acrylic acid copolymer and polymethyl acrylate, stirring for about 10min, adding deionized water under the stirring condition, and stirring for about 30 min.
S2, adding the scale inhibitor PESA and PASP under the stirring condition, continuously stirring for 20min, and canning.
Example 2:
a phosphorus-free corrosion and scale inhibitor:
the corrosion inhibition component comprises the following components: 20g of modified PAA (para-standard acmer0100), 5g of 2-acrylamido-2-methylpropanesulfonic acid acrylic acid copolymer, 5g of zinc sulfate, 1g of BTA, 5g of tartaric acid, 5g of sodium gluconate and 59g of deionized water;
the scale inhibition component comprises the following components: 30g of modified PAA (para-standard acmer0100), 5g of 2-acrylamido-2-methylpropanesulfonic acid acrylic acid copolymer, 5g of polyethylacrylate, 5g of PASP and 55g of deionized water.
Example 3:
a phosphorus-free corrosion and scale inhibitor:
the corrosion inhibition component comprises the following components: 10g of HPMA, 5g of PAA, 10g of 2-acrylamido-2-methylpropanesulfonic acid-acrylic acid-acrylate copolymer, 8g of zinc sulfate, 0.5g of BTA, 5g of potassium sodium tartrate, 5g of sodium gluconate and 56.5g of deionized water;
the scale inhibition component comprises the following components: 20g of HPMA, 10g of 2-acrylamido-2-methylpropanesulfonic acid-acrylic acid-acrylate, 10g of polyhydroxyethyl acrylate, 3g of PESA and 57g of deionized water.
The water quality parameters of the park circulating water make-up water (experimental water) are shown in table 1 below.
TABLE 1
Taking 1L of production water according to the corrosion inhibition performance evaluation data of the product, and adding a medicament in advance to enable the concentration of the medicament after the experiment to be the preset use concentration; after being stirred evenly, the water body is naturally concentrated at the temperature of 70 ℃. And taking out the water body when the volume of the water body is 200mL, naturally cooling the water body under a closed condition, filtering the water body by using medium-speed quantitative filter paper, measuring the ion concentration in the water body, and calculating the scale inhibition rate, wherein the results are shown in the following table 2.
TABLE 2
The corrosion inhibition performance evaluation data of the product is obtained by adopting a rotary hanging piece experiment to test multiple groups of compound combinations taking a formula FX-601 main body as a main body: the experimental period is 77 hours; the hanging piece is made of carbon steel A3, the temperature is 80 +/-1 ℃, the specific corrosion rate is shown in the following table 3,
TABLE 3
| Performance index | Example 1 | Example 2 | Example 3 |
| Corrosion rate, mm/a (the lower the value, the better the corrosion inhibition) | 0.0401 | 0.0692 | 0.0397 |
The application case is as follows:
the phosphorus-free corrosion and scale inhibitor prepared in example 3 was applied to water treatment.
The specific treatment method is characterized in that when the concentration multiple of the system is 1-2, the corrosion tendency of the system is obvious; the using proportion is 80ppm of the component A of the phosphorus-free corrosion and scale inhibitor; the component B is 20ppm, the adding concentration of the phosphorus-free corrosion and scale inhibitor A is gradually reduced along with the increase of the concentration multiple of the system, the adding concentration of the phosphorus-free corrosion and scale inhibitor B is gradually increased, and the concentration multiple of the phosphorus-free corrosion and scale inhibitor A is 40ppm when the concentration multiple is 23; 60ppm of component B; when the concentration multiple is 3-3.5, the component A of the phosphorus-free corrosion and scale inhibitor is 20 ppm; 80ppm of component B;
in the later stage of system operation (concentration multiple is more than 3.5), when the scaling tendency of the system is obvious, the use proportion is 10ppm of the component A of the phosphorus-free corrosion and scale inhibitor; the phosphorus-free corrosion and scale inhibitor B component is 90 ppm.
FIG. 1 is a graph of scale inhibition rate; FIG. 2 is a graph of pH. Therefore, the system can stably operate under the condition of 4 times of operation, and the PH sufficiency rate is kept stable.
Experiments verify that in the initial stage of system operation, a slow pre-filming process exists, and the coupon is not corroded in 3 days under the condition of raw water, so that obvious filming occurs. The test of the copper sulfate pre-film detection solution shows that the time of red spot is 5367s (obviously longer than 10s required by the national standard).
The scale inhibition rate of the medicament in the subsequent operation can reach 90 percent, the pH value of circulating water is kept stable, the water body is clear, the turbidity is less than 10NTU, the iron content is less than 0.5mg/L, the fouling thermal resistance of the heat exchanger is lower than 3.44 multiplied by 10 < -4 > m2 & K/W specified by the national standard, and carbon steel, stainless steel and copper hanging pieces hung in the system are all lower than 0.075mm/a and 0.005mm/a specified by the national standard.
Claims (10)
1. A non-phosphorus corrosion and scale inhibitor is characterized by comprising a corrosion inhibition component and a scale inhibition component;
wherein the corrosion inhibition component comprises the following components in parts by weight: 10-20% of polycarboxylate, 5-10% of polysulfonate, 5-10% of zinc salt, 0.5-1% of BTA, 5% of pH regulator and 5% of sodium gluconate, and the balance of deionized water;
the scale inhibition component comprises the following components in parts by weight: 15-30% of polycarboxylate, 5-10% of polysulfonate, 5-10% of polycarboxylate, 3-5% of scale inhibitor and the balance of deionized water.
2. The phosphorus-free corrosion and scale inhibitor according to claim 1, wherein: the polycarboxylate of the corrosion inhibition component is HPMA or a modified compound thereof; the polycarboxylate of the scale inhibiting component is HPMA, PAA or a HPMA-modified compound, or a PAA-modified compound.
3. The phosphorus-free corrosion and scale inhibitor according to claim 1, wherein: the polysulfonate is a homopolymer or copolymer taking 2-acrylamide-2-methylpropanesulfonic acid as a monomer.
4. The phosphorus-free corrosion and scale inhibitor according to claim 1, wherein: the zinc salt is zinc sulfate or zinc chloride.
5. The phosphorus-free corrosion and scale inhibitor according to claim 1, wherein: the pH regulator is borax, tartaric acid or tartrate.
6. The phosphorus-free corrosion and scale inhibitor according to claim 1, wherein: the polycarboxylate is methyl ester or ethyl ester of HPMA, PAA and modified compounds thereof.
7. The phosphorus-free corrosion and scale inhibitor according to claim 1, wherein: the scale inhibitor in the scale inhibition component is one or more of PESA and PASP.
8. The method for preparing the phosphorus-free corrosion and scale inhibitor of any one of claims 1 to 7, which is characterized by comprising the following steps:
wherein, when the corrosion inhibition component is prepared:
s1, adding polycarboxylate and polysulfonate, adding partial deionized water to make the total mass reach 35% of the mass of a single batch, and stirring the materials to be uniformly mixed;
s2, adding zinc salt and BTA, mixing uniformly, adding a pH regulator and sodium gluconate, and continuing to stir for 10-20 min;
s3, finally adding the rest deionized water under the stirring condition, and uniformly mixing to obtain the water-based paint;
when the scale inhibition component is prepared:
s1, adding polycarboxylate, polysulfonate and polycarboxylate, mixing uniformly, adding deionized water under the condition of stirring, and mixing uniformly;
s2, adding the scale inhibitor under the stirring condition, and uniformly mixing to obtain the scale inhibitor.
9. The application of the phosphorus-free corrosion and scale inhibitor of any one of claims 1 to 7 in water treatment is characterized in that: when water is treated, the adding proportion of the corrosion inhibition component and the scale inhibition component is flexibly changed according to the running state of water quality and circulating water.
10. Use according to claim 9, characterized in that: at the initial stage of water treatment, the consumption of corrosion inhibition components is large, and the consumption of scale inhibition components is small; then, the adding amount of the corrosion inhibition component is gradually reduced, and the adding amount of the corrosion inhibition component is increased.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010077A (en) * | 2010-12-29 | 2011-04-13 | 李秀宁 | Non-phosphate anti-incrustation corrosion inhibitor and preparation process thereof |
| CN111439852A (en) * | 2020-05-22 | 2020-07-24 | 德蓝水技术股份有限公司 | Zinc salt corrosion inhibitor and preparation method thereof |
| CN112047498A (en) * | 2020-07-29 | 2020-12-08 | 深圳市长隆科技有限公司 | Circulating water phosphorus-free corrosion and scale inhibitor and preparation method thereof |
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- 2021-11-26 CN CN202111447036.0A patent/CN114195275A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010077A (en) * | 2010-12-29 | 2011-04-13 | 李秀宁 | Non-phosphate anti-incrustation corrosion inhibitor and preparation process thereof |
| CN111439852A (en) * | 2020-05-22 | 2020-07-24 | 德蓝水技术股份有限公司 | Zinc salt corrosion inhibitor and preparation method thereof |
| CN112047498A (en) * | 2020-07-29 | 2020-12-08 | 深圳市长隆科技有限公司 | Circulating water phosphorus-free corrosion and scale inhibitor and preparation method thereof |
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