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General corrosion and scale inhibitor for purifying circulating water and preparation and application thereof

A technology of corrosion and scale inhibitors and clean circulating water, which is applied in the directions of descaling and water softening, chemical instruments and methods, complexes/solubilizing agents, etc. Water quality is easy to change and other problems, to achieve the effects of insensitive response to water quality changes, less dosing, and good corrosion inhibition effect

Inactive Publication Date: 2014-06-18
北京奈诺环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) The water quality of the system is easy to change, and it is required that the chemical has a wide range of stable water quality
[0006] 3) The system water quality L.S.I (saturation index) is mostly negative, and the corrosive water quality with R.S.I index greater than 6 is easy to corrode the equipment and cause perforation of the cooling pipe
At present, most of the corrosion and scale inhibitors have to go through a lot of tests to find a specific formula product, which is incomparable with this product in terms of economy and effectiveness.

Method used

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  • General corrosion and scale inhibitor for purifying circulating water and preparation and application thereof
  • General corrosion and scale inhibitor for purifying circulating water and preparation and application thereof
  • General corrosion and scale inhibitor for purifying circulating water and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Corrosion and scale inhibitor ingredients: 38% polyepoxysuccinate (PESA) 30%, 50% hydroxyethylidene diphosphonic acid (HEDP) 10%, 94% zinc sulfate heptahydrate 6%, 30% solid content 3% of sodium polyacrylate, 5% of benzotriazole (BTA), and the rest of water.

[0035] The preparation method is: add hydroxyethylidene diphosphonic acid and water into the reaction kettle, control the temperature at 45°C, then add polyepoxysuccinate, zinc sulfate, sodium polyacrylate, and benzotriazole in sequence in proportion After stirring at 50°C for 30 minutes, a clear amber liquid was obtained.

[0036] Corrosion inhibition rate test: According to the national standard GB / T18175-2000, the production is as follows figure 1 The device: including glass cylinder 1, power supply 3, temperature controller 4, power supply 3 and temperature controller 4 are connected, power supply 3 and temperature controller 4 are set outside the glass cylinder 1, temperature controller 4 is also connected w...

Embodiment 2

[0048] Add 38% PESA (polyepoxysuccinate) 35% and 50% HEDP (hydroxyethylidene diphosphoric acid) 12%, 94% zinc sulfate heptahydrate 9%, 30% PAAS (polyacrylic acid) in proportion to the reactor in turn. Sodium) 5%, BTA (benzotriazole) 6%, distilled water 33%; then stirred for 30 minutes to obtain a transparent amber liquid.

[0049] The preparation method is: add hydroxyethylidene diphosphonic acid and water into the reaction kettle, control the temperature at 40°C, then add polyepoxysuccinate, zinc sulfate, sodium polyacrylate, and benzotriazole in sequence in proportion After stirring at 50°C for 30 minutes, a clear amber liquid was obtained.

[0050]Corrosion inhibition performance was tested according to the device and method of Example 1. In this embodiment, the corrosion coupon is made of 20# carbon steel, b=0.010mm / a.

Embodiment 3

[0052] Corrosion and scale inhibitor ingredients: 38% polyepoxysuccinate (PESA), 40%, 50% hydroxyethylidene diphosphonic acid (HEDP), 15%, 94% zinc sulfate heptahydrate, 10%, 30% solid content 6% of sodium polyacrylate, 8% of benzotriazole (BTA), and the rest of water.

[0053] The preparation method is: add hydroxyethylidene diphosphonic acid and water into the reaction kettle, control the temperature at 45°C, then add polyepoxysuccinate, zinc sulfate, sodium polyacrylate, and benzotriazole in sequence in proportion After stirring at 48°C for 30 minutes, a clear amber liquid was obtained.

[0054] The sustained-release performance was tested according to the device and method of Example 1. In this embodiment, the corrosion coupon is made of 20# carbon steel, b=0.012mm / a.

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Abstract

The invention belongs to the field of water treatment, and relates to a general corrosion and scale inhibitor for purifying circulating water. The general corrosion scale inhibitor comprises the following components by weight percent: 15-50% of polyepoxysuccinic acid, 6-15% of etidronic acid, 2-7% of zinc sulfate, 1-10% of acrylic copolymer and 1-10% of benzotriazole. The corrosion scale inhibitor disclosed by the invention has an effect on most of corrosive water, and the scale inhibiting ratio is greater than 90%. Compared with polyhydric alcohol phosphate ester or phosphoric acid corrosion inhibitor mostly adopted at present, which pays attention to corrosion inhibition and reduces the scale inhibiting ratio, the product does not relate to any organophosphorus corrosion inhibitor, the corrosion inhibiting effect is good, and the corrosion inhibitors such as the polyhydric alcohol phosphate ester or a phosphoric acid and the like are not used. Therefore, the general corrosion scale inhibitor is low in phosphorus and free of nitrogen, is easily degraded under a natural condition, is small in effective dosage, which just is 10ppm in general, obvious in effect, large in stable range, and not acute to water quality change reaction, and the system operation security coefficient is high.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to an additive for circulating water in metallurgical ironmaking equipment and its preparation and application. Background technique [0002] The net circulating water system is often used for indirect cooling of general equipment and as refrigerant water for heat exchangers. It mainly includes the cooling of blast furnaces, converters, and electric furnaces in iron and steel enterprises, as well as the cooling of continuous casting machine equipment and mold copper sleeves. [0003] The process flow of the net circulating water system is as follows: the water from the circulating water supply pump of the water treatment station passes through the self-cleaning filter for cooling of the process equipment, then cools through the cooling tower, enters the cold water pool, and then is absorbed by the circulating water supply pump of the water treatment station; or cooling Af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F5/14C02F5/08C02F5/12
Inventor 孙红建
Owner 北京奈诺环保科技有限公司
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