CN116282601A - Dirt preventive agent and preparation method and application thereof - Google Patents
Dirt preventive agent and preparation method and application thereof Download PDFInfo
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- CN116282601A CN116282601A CN202310521516.XA CN202310521516A CN116282601A CN 116282601 A CN116282601 A CN 116282601A CN 202310521516 A CN202310521516 A CN 202310521516A CN 116282601 A CN116282601 A CN 116282601A
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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
- C02F5/14—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
- C02F5/145—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 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
- C02F5/105—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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
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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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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a dirt preventive agent and a preparation method and application thereof; belongs to the technical field of water treatment agents; wherein the soil inhibitor has a phosphonic acid component; the phosphonic acid component comprises at least one of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid and hexamethylenediamine tetramethylene phosphonic acid. The scale inhibitor prepared by the invention can be used for preventing metal substances in a water system from corroding, and can also inhibit precipitation of inorganic scale in the water system. The scale inhibitor has excellent corrosion and scale inhibition performance and higher Cl ‑ The removal rate can be widely applied to circulating cooling water.
Description
Technical Field
The invention belongs to the technical field of water treatment agents, and particularly relates to a fouling preventive agent, a preparation method and application thereof.
Background
In the circulation system, the cooling water can cause more serious sediment adhesion and equipment corrosion than those of the direct current system due to the reasons of temperature, speed, pH, dissolved oxygen content, concentration of inorganic ions and the like of the water. A plurality of production practices show that the problems of scaling and corrosion of pipelines can be effectively solved only by adopting effective maintenance measures and selecting and adding corresponding scale inhibitor according to the field conditions.
Currently, scale inhibitors are widely used as inorganic polyphosphates, organic phosphates, platinates, and the like. The single medicament is difficult to achieve the effect of corrosion and scale inhibition, and a plurality of corrosion and scale inhibition medicaments are adopted for compounding, so that the synergistic effect of the plurality of medicaments is fully exerted, and a better effect is achieved.
The prior art CN104230015A discloses a compound slow-release scale inhibitor suitable for a petrochemical wastewater recycling circulating water system; consists of 2-phosphobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid and zinc sulfate; the water quality corrosion inhibition rate is 86.18%, the dynamic simulation experiment is carried out on the reuse water of the ethylene plant, the water quality corrosion inhibition rate is 86.44%, and the scale inhibition rate is 87.42%. The corrosion rate is reduced to 0.0168mm/a and 0.0091mm/a, and meets the corrosion prevention requirement that the corrosion rate of medium petrochemical circulating cooling water is less than 0.075 mm/a. Compared with the existing polyphosphonate composite slow-release scale inhibitor, the composite slow-release scale inhibitor has the advantages of small addition amount and good corrosion and scale inhibition effect.
Disclosure of Invention
The invention aims to provide a scale inhibitor with excellent scale and corrosion inhibition performance, which can be applied to high Cl - The concentration of the circulating cooling water has higher removal rate.
The technical scheme adopted by the invention for achieving the purpose is as follows:
a soil inhibitor contains a phosphonic acid component;
the phosphonic acid component comprises at least one of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid and hexamethylenediamine tetramethylene phosphonic acid.
The prepared scale inhibitor containing the phosphonic acid component has better dispersion performance on barium sulfate, namely the scale inhibitor has better dispersion stability; it has excellent scale inhibiting performance on circulating water and can be used for containing higher Cl - Circulating cooling water with higher concentration and Cl - The removal rate and the scale inhibitor have higher corrosion inhibition rate.
Further, in a preferred embodiment, the soil inhibitor comprises a carboxylic acid copolymer; the carboxylic acid copolymer comprises at least one of polyacrylic acid, polymaleic acid, polyaspartic acid and polyepoxysuccinic acid.
Further, in a preferred embodiment, the scale inhibitor contains at least one of hydrochloric acid, phosphoric acid and sulfuric acid.
Further, in a preferred embodiment, the scale inhibitor contains at least one of zinc chloride, zinc sulfate and sodium hexametaphosphate.
Further, in a preferred embodiment, the scale inhibitor contains at least one of isothiazolone, methylbenzotriazole and benzotriazol.
The invention also discloses a scale inhibitor with a corrosion inhibition rate higher than 87%.
The invention also provides application of the fouling preventive agent in a circulating cooling water system.
The pH value of water in the water system is 7.5-8.5, the hardness of calcium in the water is lower than 1600mg/L, and Cl - The concentration is lower than 2000mg/L.
The addition amount of the fouling preventive agent disclosed by the invention in cooling water is 40-180mg/L.
The invention also discloses a preparation method of the dirt preventive agent, which comprises the following steps: the components are put into a container according to the proportion and are uniformly mixed to obtain the dirt preventive agent.
The prepared scale inhibitor containing the phosphonic acid component has better dispersion performance on barium sulfate, namely has better dispersion stability; it has excellent scale inhibiting performance on circulating water and can be used for containing higher Cl - Circulating cooling water with higher concentration and Cl - The removal rate and the scale inhibitor have higher corrosion inhibition rate. Therefore, the invention is a scale inhibitor with excellent scale and corrosion inhibition performance, and can be applied to high Cl - The concentration of the circulating cooling water has higher removal rate.
Drawings
FIG. 1 is an infrared spectrum of example 4 before and after gluconic acid modification.
Detailed Description
The following detailed description of the invention is provided in connection with the accompanying drawings that are presented to illustrate the invention and not to limit the scope thereof. The examples provided below are intended as guidelines for further modifications by one of ordinary skill in the art and are not to be construed as limiting the invention in any way.
Further, in a preferred embodiment, the present invention discloses a soil inhibitor comprising the following components: polyacrylic acid, polymaleic acid, 2-acrylamide-2-methylpropanesulfonic acid, isothiazolinone, zinc chloride, hydrochloric acid, 2-phosphonobutane-1, 2, 4-tricarboxylic acid), hydroxyethylidene diphosphonic acid, phosphoric acid, hexamethylenediamine tetramethylene phosphonic acid, sodium hexametaphosphate, methylbenzotriazole, sulfuric acid, benzene propyltriazole, and water.
Further, in a preferred embodiment, 3 to 10 parts by weight of polyacrylic acid, 2 to 8 parts by weight of polymaleic acid, 1 to 6 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 5 parts by weight of isothiazolinone, 0.5 to 1.2 parts by weight of zinc chloride, 2 to 9 parts by weight of hydrochloric acid, 10 to 25 parts by weight of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 8 to 15 parts by weight of hydroxyethylidene diphosphonic acid, 3 to 10 parts by weight of phosphoric acid, 5 to 12 parts by weight of hexamethylenediamine tetramethylene phosphonic acid, 1 to 5 parts by weight of sodium hexametaphosphate, 1 to 5 parts by weight of methylbenzotriazole, 0.1 to 0.5 part by weight of sulfuric acid, 2 to 6 parts by weight of benzotriazol, and 30 to 60 parts by weight of water.
Further, in a preferred embodiment, a method of preparing a soil inhibitor comprises: placing polyacrylic acid, polymaleic acid, 2-acrylamide-2-methylpropanesulfonic acid, isothiazolinone, zinc chloride, hydrochloric acid, phosphoric acid, sodium hexametaphosphate, methylbenzotriazole, sulfuric acid, benzotriazole, phosphonic acid component and water in a container, wherein PO in the phosphonic acid component 4 3- The concentration of the water is 25-30mg/L, and the water is fully stirred and uniformly mixed to obtain the dirt preventive agent.
Further, in a preferred embodiment, the phosphonic acid component comprises 2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, hexamethylenediamine tetramethylene phosphonic acid; wherein the weight ratio of the 2-phosphonobutane-1, 2, 4-tricarboxylic acid to the hydroxyethylidene diphosphonic acid to the hexamethylenediamine tetramethylene phosphonic acid is 1-2:0.5-1.5:0.5-1.
The invention prepares the scale inhibitor by compounding polyacrylic acid, polymaleic acid, 2-acrylamide-2-methylpropanesulfonic acid, isothiazolinone, zinc chloride, hydrochloric acid, phosphoric acid, sodium hexametaphosphate, methylbenzotriazole, sulfuric acid, benzotriazol, phosphonic acid component (2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, hexamethylenediamine tetramethylene phosphonic acid) and water, and has higher scale inhibition rate and corrosion inhibition rate, and higher Cl at the same time - The removal rate.
Further, in a preferred embodiment, a method of preparing a soil inhibitor comprises: according to the weight parts, 3-10 parts of polyacrylic acid, 2-8 parts of polymaleic acid, 1-6 parts of 2-acrylamide-2-methylpropanesulfonic acid, 1-5 parts of isothiazolinone, 0.5-1.2 parts of zinc chloride, 2-9 parts of hydrochloric acid, 3-10 parts of phosphoric acid, 1-5 parts of sodium hexametaphosphate, 1-5 parts of methylbenzotriazole, 0.1-0.5 part of sulfuric acid, 2-6 parts of benzotriazole and 5-12 parts of phosphonic acid components (wherein the weight ratio of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid and hexamethylenediamine tetramethylene phosphonic acid is 1-2:0.5-1.5:0.5-1) are placed in a container, and fully stirred and uniformly mixed to obtain the scale inhibitor.
In order to further improve the corrosion and scale inhibition performance, the method also comprises the following steps: and adding the gluconic acid derivative into the scale inhibitor, wherein the addition amount of the gluconic acid derivative is 1-4wt% of the scale inhibitor.
Further, in a preferred embodiment, the gluconic acid derivative is prepared using 1H-benzimidazole-2-carbaldehyde modified gluconic acid. The gluconic acid derivative is prepared by utilizing 1H-benzimidazole-2-formaldehyde modified gluconic acid and is used as a component of the scale inhibitor, so that the corrosion and scale inhibition performance of the scale inhibitor is further improved, and the Cl of the scale inhibitor is also improved - The removal rate is used for meeting the national use standard.
Still further, in a preferred embodiment, a method for preparing a gluconic acid derivative comprises:
preparing gluconic acid into a gluconic acid solution, placing the gluconic acid solution in a container, adding methanol and concentrated hydrochloric acid, stirring uniformly, then slowly adding 1H-benzimidazole-2-formaldehyde solution, reacting for 24-48 hours at 5-15 ℃, adding water after the reaction is finished, stirring uniformly, carrying out suction filtration, neutralizing to be neutral, washing, carrying out suction filtration, and drying to obtain the gluconic acid derivative.
Further, in a preferred embodiment, in the method for preparing a gluconic acid derivative, the gluconic acid solution is 15 to 30 parts by weight, the methanol is 10 to 20 parts by weight, the concentrated hydrochloric acid is 20 to 40 parts by weight, the 1H-benzimidazole-2-formaldehyde solution is 30 to 50 parts by weight, and the water is 20 to 40 parts by weight.
Further, in a preferred embodiment, the concentration of the gluconic acid solution is 25-50wt%; the concentration of the 1H-benzimidazole-2-formaldehyde solution is 10-30wt%.
The technical scheme of the invention is further described in detail below with reference to the specific embodiments:
[ example 1 ]
A method of preparing a soil inhibitor comprising: according to the weight parts, 5 parts of polyacrylic acid, 3 parts of polymaleic acid, 4 parts of 2-acrylamide-2-methylpropanesulfonic acid, 4 parts of isothiazolinone, 0.8 part of zinc chloride, 6 parts of hydrochloric acid, 7 parts of phosphoric acid, 10 parts of phosphonic acid components (wherein the weight ratio of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid and hexamethylenediamine tetramethylene phosphonic acid is 1:0.5:1), 2 parts of sodium hexametaphosphate, 1 part of methylbenzotriazole, 0.2 part of sulfuric acid, 4 parts of benzotriazole and 40 parts of water are placed in a container, and fully stirred and uniformly mixed to obtain the scale inhibitor.
[ example 2 ]
A method for producing a scale inhibitor, the other steps being the same as in example 1, except that: the scale inhibitor comprises the following components in parts by weight: 8 parts of polyacrylic acid, 5 parts of polymaleic acid, 1 part of 2-acrylamide-2-methylpropanesulfonic acid, 3 parts of isothiazolinone, 1 part of zinc chloride, 8 parts of hydrochloric acid, 10 parts of phosphoric acid, 8 parts of hexamethylenediamine tetramethylene phosphonic acid, 3 parts of sodium hexametaphosphate, 2 parts of methylbenzotriazole, 0.3 part of sulfuric acid, 5 parts of benzene-propyltriazole, 8 parts of phosphonic acid component (wherein the weight ratio of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid and hexamethylenediamine tetramethylene phosphonic acid is 1:0.5:1) and 50 parts of water.
[ example 3 ]
A process for the preparation of a gluconic acid derivative comprising:
dissolving D-gluconic acid in water to prepare a gluconic acid solution with the concentration of 40 weight percent, placing 20 parts of the gluconic acid solution in a container, adding 15 parts of absolute methanol and 20 parts of concentrated hydrochloric acid, mechanically stirring uniformly, slowly adding 40 parts of a methanol solution of 1H-benzimidazole-2-formaldehyde with the concentration of 20 weight percent, reacting for 48 hours at 8 ℃, adding 30 parts of water after the reaction is finished, stirring uniformly, carrying out suction filtration, neutralizing a filter cake with pyridine to be neutral, washing with deionized water for 3 times, washing with dichloromethane for 3 times, carrying out suction filtration, and drying to constant weight to obtain the gluconic acid derivative.
[ example 4 ]
A method for producing a scale inhibitor, the other steps being the same as in example 1, except that: the gluconic acid derivative of example 4 was added to the scale inhibitor in an amount of 1wt% of the scale inhibitor.
[ example 5 ]
A method for producing a scale inhibitor, the other steps being the same as in example 1, except that: the gluconic acid derivative of example 4 was added to the scale inhibitor in an amount of 2wt% of the scale inhibitor.
[ example 6 ]
A method for producing a scale inhibitor, the other steps being the same as in example 1, except that: the gluconic acid derivative of example 4 was added to the scale inhibitor in an amount of 4wt% based on the scale inhibitor.
[ example 7 ]
A method for producing a scale inhibitor, the other steps being the same as in example 1, except that: d-gluconic acid was added to the scale inhibitor in an amount of 2wt% of the scale inhibitor.
[ example 8 ]
In order to optimize the performance of the soil inhibitor, the preferred measures taken in the present invention further include: 0.5-2.5wt% of 3-hydroxybutyric acid is added into the scale inhibitor, and the 3-hydroxybutyric acid possibly interacts with other components in the scale inhibitor, so that the corrosion inhibition and scale inhibition performances of the scale inhibitor are further improved, and meanwhile, the scale inhibitor has excellent stability.
A method for producing a scale inhibitor, the other steps being the same as in example 1, except that: to the soil inhibitor was added 0.5% by weight of 3-hydroxybutyric acid.
[ example 9 ]
A method for producing a scale inhibitor, the other steps being the same as in example 1, except that: to the soil inhibitor was added 2.5% by weight of 3-hydroxybutyric acid.
[ example 10 ]
A method for producing a scale inhibitor, the other steps being the same as in example 5, except that in example 5: to the soil inhibitor was added 2.5% by weight of 3-hydroxybutyric acid.
[ test example ]
1. Infrared spectroscopy testing
The infrared spectrum before and after the gluconic acid modification IS tested by a Nicolet IS-10 type Fourier transform infrared spectrum instrument, and the testing range IS 500-1000cm -1 。
FIG. 1 is a chart showing the gluconic acid change in example 4Infrared spectrograms before and after sex; curves a and b are respectively gluconic acid and gluconic acid derivatives; as can be seen from FIG. 1, the gluconic acid derivative is at 3050cm compared to gluconic acid -1 The characteristic absorption peak appearing from left to right is the telescopic vibration of benzene ring; at 1750cm -1 The characteristic absorption peak appearing from left to right is the stretching vibration of the ester group; at 1570cm -1 The characteristic absorption peak appearing from left to right is C-N telescopic vibration; this indicates that the gluconic acid derivative is prepared by modifying gluconic acid with 1H-benzimidazole-2-formaldehyde.
2. Soil inhibitor Performance test
Test of the dispersing ability of barium sulfate
The dispersibility of the scale inhibitor to barium sulfate was measured according to a measurement method of the suspension ratio, wherein the amount of the scale inhibitor used was 120mg/L.
TABLE 1 dispersing ability of soil inhibitor to barium sulfate
As can be seen from Table 1, the suspension rate of the scale inhibitor to barium sulfate in examples 1-2 and examples 4-10 is higher than 92%, which indicates that the scale inhibitor used in the present invention has a good dispersing ability to barium sulfate; the suspension ratio of the scale inhibitor to barium sulfate in examples 4-6 is higher than 95%, and the suspension ratio of the scale inhibitor to barium sulfate in comparative examples 1 and 4-7, and the suspension ratio of the scale inhibitor to barium sulfate in examples 4-6 is higher than that in examples 1 and 7, which shows that the use of 1H-benzimidazole-2-formaldehyde modified gluconic acid to prepare a gluconic acid derivative as a component of the scale inhibitor further improves the dispersing ability of the scale inhibitor to barium sulfate; the suspension ratio of the scale inhibitor to barium sulfate in examples 8 to 9 was higher than 95%, the suspension ratio of the scale inhibitor to barium sulfate in example 10 was higher than 98%, the suspension ratio of the scale inhibitor to barium sulfate in comparative examples 1 and 6, examples 8 to 10, and examples 8 to 9 was higher than example 1, the suspension ratio of the scale inhibitor to barium sulfate in example 10 was higher than example 6, which indicates that the addition of 3-hydroxybutyric acid to the scale inhibitor improves the dispersion ability of the scale inhibitor to barium sulfate, and the addition of gluconic acid derivative together with 3-hydroxybutyric acid to the scale inhibitor can significantly improve the dispersion ability of the scale inhibitor to barium sulfate.
2. Determination of scale inhibition
Preparing an experimental solution, adding a calcium chloride solution and a sodium bicarbonate solution into a beaker, adding 80mg/L of a fouling preventive agent into the beaker according to calcium carbonate, keeping the temperature at 70 ℃, standing at constant temperature for 8 hours, cooling to room temperature, filtering, taking 50mL of filtrate, placing into a conical flask, adding 10mL of potassium hydroxide solution and 0.2g of a calcium carboxylic acid indicator, adding 100mL of water, and using EDTA standard titration to change the color of the solution from purple to brilliant blue; the volume of EDTA consumed was recorded and run 3 times in parallel to calculate Ca 2+ Concentration. The calculation formula of the scale inhibition rate is as follows:
A=（V 2 -V 1 ）/V 2 ×100%
wherein: v (V) 1 Ca in the test solution after addition of the fouling preventive 2+ Concentration, mg/L; v (V) 2 For Ca in formulated experimental solution 2+ Concentration, mg/L.
TABLE 2 Ca after addition of fouling preventive agent 2+ Concentration and scale inhibition rate
As can be seen from Table 2, ca after adding the scale inhibitor in examples 1 to 2 and examples 4 to 10 2+ The concentration is lower than 1600mg/L, and the scale inhibition rate is higher than 79%, which indicates that the scale inhibitor prepared by the invention has excellent scale inhibition performance; ca after adding the fouling preventive agent in examples 4 to 6 2+ The concentration is lower than 1000mg/L, the scale inhibition rate is higher than 87%, the scale inhibition rate of the scale inhibitor in the comparative examples 1 and 4-7 and the scale inhibitors in the examples 4-6 is higher than that in the examples 1 and 7, which shows that the 1H-benzimidazole-2-formaldehyde modified gluconic acid is used for preparing the gluconic acid derivative, and the gluconic acid derivative is used as a component of the scale inhibitor, so that the scale inhibition performance of corrosion and scale inhibition is further improved; ca after adding the fouling preventive agent in examples 8 to 9 2+ The concentration is lower than 1300mg/L, and the scale inhibition rate is highCa after adding the scale inhibitor in 82% in example 10 2+ The concentration is lower than 510mg/L, the scale inhibition rate is higher than 93%, the scale inhibition rate of the scale inhibitor in the comparative examples 1 and 6 and examples 8-10 is higher than that in the example 6, the scale inhibition rate of the scale inhibitor in the examples 8-9 is higher than that in the example 1, which shows that the addition of 3-hydroxybutyric acid in the scale inhibitor further improves the scale inhibition performance of the scale inhibitor, and the addition of the gluconic acid derivative and 3-hydroxybutyric acid in the scale inhibitor together obviously improves the scale inhibition rate of the scale inhibitor to calcium carbonate so as to meet the national use standard.
3. Determination of chloride ion removal Rate
The index of using cooling water is as follows: the total alkali is 600mg/L, the total hardness is 400mg/L, the pH is 7.5-8.5, and the Cl - The concentration is 700mg/L and the concentration multiple K is 10 times, and the Cl in the circulating cooling water is at the moment - The concentration is 10000mg/L, then 50mg/L of fouling preventive agent is added, and the mixture is kept for 10min, so that Cl in cooling water is calculated - Concentration and removal rate.
TABLE 3 Cl after addition of soil inhibitor - Concentration and removal rate
As can be seen from Table 3, examples 1 to 2 and examples 4 to 10 were incorporated with a scale inhibitor and Cl - The concentration is lower than 2000mg/L, and the removal rate is higher than 82%, which indicates that the fouling preventive agent prepared by the invention can be used for containing higher Cl - Circulating cooling water with higher concentration and Cl - The removal rate; examples 4 to 6 Cl after addition of soil inhibitor - The concentration is lower than 1350mg/L, cl - The removal rate was higher than 87%, and the Cl of the scale inhibitor in examples 4 to 6 was used in comparative example 1 and examples 4 to 7 - The removal rate is higher than that of example 1 and example 7, which shows that the gluconic acid derivative prepared by using 1H-benzimidazole-2-formaldehyde modified gluconic acid is used as a component of a scale inhibitor, and the Cl for corrosion and scale inhibition is further improved - The removal rate is high, so that the method has good application in circulating cooling water; examples 8 to 9 incorporating soil protectionPost-dose Cl - The concentration was less than 1400mg/L, the scale inhibition was more than 85%, and Cl after the scale inhibitor was added in example 10 - The concentration was lower than 150mg/L, the scale inhibition rate was higher than 98%, the Cl-removal rate of the scale inhibitor in comparative example 1 and examples 6, examples 8 to 10, and example 10 was higher than that of example 6, and the Cl-removal rate of the scale inhibitor in examples 8 to 9 was higher than that of example 1, which suggests that the addition of 3-hydroxybutyric acid to the scale inhibitor further improved the scale inhibition performance of the scale inhibitor, and the addition of the gluconic acid derivative together with 3-hydroxybutyric acid to the scale inhibitor significantly improved the Cl-removal rate of the scale inhibitor.
4. Corrosion inhibition performance measurement
The test was carried out according to the GB/T18175-2000 standard, the rotating hanging piece corrosion test method. The test environment is as follows: 550mg/L Cl - ，600mg/L SO 4 2- ，550mg/L HCO 3 - The A carbon steel is a test piece, and the size is 60mm multiplied by 30mm multiplied by 5mm; the scale inhibitor with the concentration of 60mg/L is added into the simulated circulating water at the temperature of 75 ℃, the test piece is put into the simulated circulating water, and the test piece is rotated and corroded for 10 hours at the rotating speed of 100r/min, so that the corrosion inhibition rate is calculated.
The corrosion rate was calculated as follows:
X=87600×（m-m 0 ）/s·p·t
wherein: x is the corrosion rate; m is the mass of the test piece before the test, g; m0 is the mass of the test piece after the test, g; s is the surface area of the test piece, cm 3 The method comprises the steps of carrying out a first treatment on the surface of the ρ is the density of the test piece, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the t is the test time, h.
The corrosion inhibition rate is calculated as follows:
R=（X 0 -X）/X 0 ×100
wherein: x is X 0 The corrosion rate of the test piece is the corrosion rate of the test piece without the corrosion inhibitor; x is the corrosion rate of the test piece when the corrosion inhibitor is added.
TABLE 4 Corrosion inhibition of fouling prevention agents
As can be seen from Table 4, the corrosion inhibition rates of examples 1-2 and examples 4-10Above 87%, which indicates that the scale inhibitor prepared by the invention has higher corrosion inhibition rate on circulating water; the corrosion inhibition rate of examples 4-6 is higher than 91%, and the corrosion inhibition rates of comparative examples 1 and examples 4-7, and examples 4-6 are higher than those of examples 1 and 7, which shows that the gluconic acid derivative prepared by using 1H-benzimidazole-2-formaldehyde modified gluconic acid is used as a component of a scale inhibitor, so that the corrosion inhibition rate of corrosion and scale inhibition is further improved, and the gluconic acid derivative has better application in circulating water; examples 8 to 9 have a corrosion inhibition of more than 89% and example 10 has a corrosion inhibition of more than 95%, and examples 1 and 6, examples 8 to 10, example 10 show a fouling preventive agent Cl - The removal rate was higher than that of example 6, and the corrosion inhibition rates of examples 8 to 9 were higher than that of example 1, which showed that the addition of 3-hydroxybutyric acid to the scale inhibitor further improved the corrosion inhibition rate of the scale inhibitor, and that the addition of the gluconic acid derivative together with 3-hydroxybutyric acid to the scale inhibitor significantly improved the corrosion inhibition rate of the scale inhibitor.
Conventional operations in the operation steps of the present invention are well known to those skilled in the art, and are not described herein.
While the foregoing embodiments have been described in detail in connection with the embodiments of the invention, it should be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and any modifications, additions, substitutions and the like made within the principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A soil inhibitor contains a phosphonic acid component;
the phosphonic acid component comprises 2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid and hexamethylenediamine tetramethylene phosphonic acid; wherein the weight ratio of the 2-phosphonobutane-1, 2, 4-tricarboxylic acid to the hydroxyethylidene diphosphonic acid to the hexamethylenediamine tetramethylene phosphonic acid is 1-2:0.5-1.5:0.5-1.
2. A fouling prevention agent according to claim 1, characterized in that: the soil inhibitor contains a carboxylic acid copolymer; the carboxylic acid copolymer includes at least one of polyacrylic acid, polymaleic acid, polyaspartic acid, and polyepoxysuccinic acid.
3. A fouling prevention agent according to claim 1, characterized in that: the scale inhibitor contains at least one of hydrochloric acid, phosphoric acid and sulfuric acid.
4. A fouling prevention agent according to claim 1, characterized in that: the scale inhibitor contains at least one of zinc chloride, zinc sulfate and sodium hexametaphosphate.
5. A fouling prevention agent according to claim 1, characterized in that: the scale inhibitor contains at least one of isothiazolone, tolyltriazole and benzotriazol.
6. A fouling prevention agent according to claim 1, characterized in that: the scale inhibitor has a corrosion inhibition of greater than 87%.
7. Use of a scale inhibitor according to claim 1 in a recirculating cooling water system.
8. Use according to claim 7, characterized in that: the addition amount of the scale inhibitor in the cooling water is 40-180mg/L.
9. A method of preparing a soil inhibitor comprising: the components are put into a container according to the proportion and are uniformly mixed to obtain the scale inhibitor as claimed in claim 1.
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| CN117447662A (en) * | 2023-12-22 | 2024-01-26 | 广东粤首新科技有限公司 | Preparation process of water-soluble polymer scale inhibitor |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN118108349A (en) | 2024-05-31 |
| CN116282601B (en) | 2023-09-01 |
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