Composite efficient low-phosphorus corrosion-inhibiting and scale-inhibiting agent for low hardness water, and preparation method thereof

Abstract

The present invention provides a composite efficient low-phosphorus corrosion-inhibiting and scale-inhibiting agent for low hardness water, wherein the components comprise, by mass, 15-25% of a heptadecenyl hydroxyethyl imidazoline quaternary ammonium salt, 5-15% of a phosphono carboxylic acid copolymer, 10-20% of an acrylic acid-acrylate-sulfonate copolymer, 0.1-1.5% of benzotriazole, 5-15% of anhydrous zinc chloride, 1-3% of a co-solvent, and the balance of water. According to the present invention, the composite efficient low-phosphorus corrosion-inhibiting and scale-inhibiting agent is suitable for water with characteristics of low hardness, high alkalinity and strong corrosion, has alkalinity of less than 600 mg / L, and has excellent corrosion inhibition and excellent scale inhibition; and the total phosphorus content in the composite efficient low-phosphorus corrosion-inhibiting and scale-inhibiting agent of the present invention is lower than the total phosphorus content in the organic phosphates and the phosphate agents, the total phosphorus content in the industrial discharge water is less than or equal to 1.0 mg / L, and the composite efficient low-phosphorus corrosion-inhibiting and scale-inhibiting agent has characteristics of biodegradability, no pollution, environmental protection, low cost, easy compounding, good stability, less consumption, good synergy among various components, stable performance, excellent corrosion inhibition, and excellent scale inhibition.

Description

technical field

[0001] The invention relates to the technical field of water treatment, in particular to a composite high-efficiency low-phosphorus corrosion and scale inhibitor suitable for low-hardness water and a preparation method thereof. Background technique

[0002] The use of water in industrial production is indispensable, and the amount is huge. In today's increasingly scarce water resources, circulating cooling water systems are widely used in industry, and with the increase in the concentration of circulating water, scaling, corrosion and microorganisms will occur. Hazards and other problems, resulting in serious problems such as reduced efficiency of heat exchanger equipment, clogging, corrosion and perforation, etc. At present, water treatment chemicals are usually used to inhibit corrosion and scaling, and organic phosphorus-based chemicals are the most widely used.

[0003] Organophosphorus corrosion and scale inhibitors have dual functions of corrosion and s...

Examples

Embodiment 1

[0033] Embodiment 1: test raw water water quality is: PH7.78, Cond179 μ s / cm, total calcium hardness 90mg / L (as CaCO 3 Calcium hardness 50mg / L (calculated as CaCO 3 count), Cl - 60mg / L, total alkalinity 80mg / L (as CaCO 3 count).

[0034] According to the test raw water quality of 2.5 times of concentration, the experiment was carried out, and the calcium hardness 125mg / L (as CaCO 3 count), Cl - 150mg / L, total alkalinity 200mg / L (as CaCO 3 The water temperature is 40°C, each compound agent is added at 30mg / L, and the test is carried out according to the standard "Determination of Corrosion and Scale Inhibition Performance of Water Treatment Agents--Rotary Hanging Plate Method" (GB-T18175-2000), the test results are as follows .

[0035]

[0036] According to the experiment, the corrosion rate of the carbon steel coupon meets the requirements of the industrial circulating cooling water treatment design specification (GB50050--2007) at the concentration of 2.5 times. 4 ...

Embodiment 2

[0038] The raw water quality of the test is: PH7.82, Cond140μs / cm, total calcium hardness 60mg / L (calculated as CaCO 3 Calcium hardness 40mg / L (calculated as CaCO 3 count), Cl - 35mg / L, total alkalinity 61mg / L (as CaCO 3 count).

[0039] According to the test raw water quality of 5 times of concentration, the experiment was carried out, and the calcium hardness was prepared to be 300mg / L (in the form of CaCO 3 count), Cl - 175mg / L, total alkalinity 305mg / L (as CaCO 3 meter), the water temperature is 40°C, each compound agent is added at 30mg / L, and the test is carried out according to the standard of "Determination of Corrosion and Scale Inhibition Performance of Water Treatment Agents--Rotating Plate Method" (GB-T18175-2000), and the test results are as follows.

[0040]

[0041]

[0042] Experiments show that the corrosion rate of carbon steel coupons still meets the requirements of industrial circulating cooling water treatment design specifications (GB50050--200...

Embodiment 3

[0044] Formula 2 is selected and applied to a circulating water station of a factory, and the water volume of the system is 6800m 3 , the circulating water volume is 6500m 3 , the system water quality is: PH8.72, Cond877μs / cm, total calcium hardness 360mg / L (calculated as CaCO 3 Calcium hardness 280mg / L (calculated as CaCO 3 count), Cl - 155mg / L, total alkalinity 275mg / L (as CaCO 3 count). The dosage of composite low-phosphorus corrosion and scale inhibitors is 30mg / L, and after one month of operation, the corrosion rate of carbon steel coupons is 0.0203mm / a, and PO in circulating water 4 2- (calculated by total phosphorus) the total phosphorus detected every day is ≤1.0mg / L, and the system cooler has no carbonate scale deposition, which has achieved good application results.

[0045] A composite high-efficiency low-phosphorus corrosion and scale inhibitor suitable for low-hardness water of the present invention has the following advantages:

[0046] 1. There is a good ...

technical field

[0001] The invention relates to the technical field of water treatment, in particular to a composite high-efficiency low-phosphorus corrosion and scale inhibitor suitable for low-hardness water and a preparation method thereof. Background technique

[0002] The use of water in industrial production is indispensable, and the amount is huge. In today's increasingly scarce water resources, circulating cooling water systems are widely used in industry, and with the increase in the concentration of circulating water, scaling, corrosion and microorganisms will occur. Hazards and other problems, resulting in serious problems such as reduced efficiency of heat exchanger equipment, clogging, corrosion and perforation, etc. At present, water treatment chemicals are usually used to inhibit corrosion and scaling, and organic phosphorus-based chemicals are the most widely used.

[0003] Organophosphorus corrosion and scale inhibitors have dual functions of corrosion and s...

Examples

Embodiment 1

[0033] Embodiment 1: test raw water water quality is: PH7.78, Cond179 μ s / cm, total calcium hardness 90mg / L (as CaCO 3 Calcium hardness 50mg / L (calculated as CaCO 3 count), Cl - 60mg / L, total alkalinity 80mg / L (as CaCO 3 count).

[0034] According to the test raw water quality of 2.5 times of concentration, the experiment was carried out, and the calcium hardness 125mg / L (as CaCO 3 count), Cl - 150mg / L, total alkalinity 200mg / L (as CaCO 3 The water temperature is 40°C, each compound agent is added at 30mg / L, and the test is carried out according to the standard "Determination of Corrosion and Scale Inhibition Performance of Water Treatment Agents--Rotary Hanging Plate Method" (GB-T18175-2000), the test results are as follows .

[0035]

[0036] According to the experiment, the corrosion rate of the carbon steel coupon meets the requirements of the industrial circulating cooling water treatment design specification (GB50050--2007) at the concentration of 2.5 times. 4 ...

Embodiment 2

[0038] The raw water quality of the test is: PH7.82, Cond140μs / cm, total calcium hardness 60mg / L (calculated as CaCO 3 Calcium hardness 40mg / L (calculated as CaCO 3 count), Cl - 35mg / L, total alkalinity 61mg / L (as CaCO 3 count).

[0039] According to the test raw water quality of 5 times of concentration, the experiment was carried out, and the calcium hardness was prepared to be 300mg / L (in the form of CaCO 3 count), Cl - 175mg / L, total alkalinity 305mg / L (as CaCO 3 meter), the water temperature is 40°C, each compound agent is added at 30mg / L, and the test is carried out according to the standard of "Determination of Corrosion and Scale Inhibition Performance of Water Treatment Agents--Rotating Plate Method" (GB-T18175-2000), and the test results are as follows.

[0040]

[0041]

[0042] Experiments show that the corrosion rate of carbon steel coupons still meets the requirements of industrial circulating cooling water treatment design specifications (GB50050--200...

Embodiment 3

[0044] Formula 2 is selected and applied to a circulating water station of a factory, and the water volume of the system is 6800m 3 , the circulating water volume is 6500m 3 , the system water quality is: PH8.72, Cond877μs / cm, total calcium hardness 360mg / L (calculated as CaCO 3 Calcium hardness 280mg / L (calculated as CaCO 3 count), Cl - 155mg / L, total alkalinity 275mg / L (as CaCO 3 count). The dosage of composite low-phosphorus corrosion and scale inhibitors is 30mg / L, and after one month of operation, the corrosion rate of carbon steel coupons is 0.0203mm / a, and PO in circulating water 4 2- (calculated by total phosphorus) the total phosphorus detected every day is ≤1.0mg / L, and the system cooler has no carbonate scale deposition, which has achieved good application results.

[0045] A composite high-efficiency low-phosphorus corrosion and scale inhibitor suitable for low-hardness water of the present invention has the following advantages:

[0046] 1. There is a good ...

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