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Low-zincium organophosphor scale inhibitor for recirculated cooling water process

A corrosion and scale inhibitor, organic phosphorus technology, applied in water/sludge/sewage treatment, descaling and water softening, chemical instruments and methods, etc., can solve problems such as environmental pollution, excessive zinc content, low zinc content, etc. , to achieve the effect of eliminating environmental pollution

Active Publication Date: 2008-08-20
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a low-zinc organic phosphorus corrosion and scale inhibitor for circulating cooling water with low zinc content and excellent corrosion and scale inhibition effect, so as to solve the problem of circulation The problem of environmental pollution caused by excessive zinc content in water and sewage; at the same time, the present invention also solves the technical problem that the organophosphorus zinc corrosion and scale inhibitor continues to maintain its effectiveness under the condition of low zinc ion / organophosphorus molar ratio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] From February to April 2005, the energy workshop of the cold rolling sheet factory determined the composition, proportion and dosage of the corrosion and scale inhibitor of the present invention through static scale inhibition test, rotary coupon corrosion test, chemical screening test, and chemical compatibility test. And found that the oxidizing bactericide used has no adverse effect on the corrosion and scale inhibitor of the present invention. The dynamic simulation test at the end of March and the beginning of April 2005 further verified the performance of the formula and determined the consumption of the corrosion and scale inhibitor of the present invention. The components and weight percentages of the low zinc corrosion and scale inhibitor of the present invention are shown in Table 1 .

[0018] Table 1. Contents and functions of each component in the test formula

[0019] main component

Proportion (%)

effect

Phosphonic acid (PBTC)...

Embodiment 2

[0024] The preparation process of the corrosion and scale inhibitor of the present invention: prepare 100 grams of medicament solution

[0025] 22 grams of PBTC with a solid content of 50%, 10 grams of HEDP with a solid content of 50%, 6 grams of organic phosphate, and 20 grams of a terpolymer of AA / AMPS / HPA with a solid content of 30% were stirred and dissolved in 38.5 grams of purified water , and then 3 grams of zinc sulfate heptahydrate were dissolved in the above solution, and finally 0.5 gram of hydrogen peroxide was added and mixed uniformly.

[0026] When adding 100 grams of the prepared medicament solution to the cooling water at a concentration of 100mg / L, each single component is the required concentration, that is, PBTC, HEDP, organic phosphate, AA / AMPS / HPA, zinc in circulating water The effective concentrations of ions are 11mg / L, 5mg / L, 3mg / L, 6mg / L and 0.68mg / L respectively.

Embodiment 3

[0028] Preparation process: prepare 100 grams of medicinal solution

[0029] 22 grams of PBTC with a solid content of 50%, 10 grams of HEDP with a solid content of 50%, 6 grams of organic phosphate, and 20 grams of a terpolymer of AA / AMPS / HPA with a solid content of 30% were stirred and dissolved in 39.5 grams of purified water , and then 2 grams of zinc sulfate heptahydrate were dissolved in the above solution, and finally 0.5 gram of hydrogen peroxide was added and mixed uniformly.

[0030] When adding 100 grams of the prepared medicament solution to the cooling water at a concentration of 100mg / L, each single component is the required concentration, that is, PBTC, HEDP, organic phosphate, AA / AMPS / HPA, zinc in circulating water The effective concentrations of ions are 11mg / L, 5mg / L, 3mg / L, 6mg / L and 0.45mg / L respectively.

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Abstract

The invention relates to an environment-friendly low-zinc organic phosphorus corrosion and scale inhibitor, which comprises the following components in percentages by weight: organic phosphono-carboxylic acid (PBTC) 20 to 25%, organic phosphoric acid (HEDP) 10 to 12%, organic phosphoric acid ester 5 to 8%, zinc salt 3 to 4%, macromolecular dispersing agent with sulfonic group, mildew inhibitor 0.5%, and pure water accounting for the rest percentage. The corrosion and scale inhibitor in the invention has the advantages that: the zinc content in circulating water and sewer water is less than 1.5mg / L, and desirable corrosion and scale resistant effects can be achieved at the same time of reducing the pollution to the environment.

Description

technical field [0001] The invention relates to the field of cooling water treatment of an industrial open circulating water cooling system, in particular to an environment-friendly low-zinc organic phosphorus corrosion and scale inhibitor. Background technique [0002] The open circulating water cooling system is one of the circulating water cooling systems and is widely used in industrial production. However, due to the repeated use of the cooling water, the increase in the concentration of minerals and ions in the water will cause fouling in the system; coupled with the direct contact between the circulating cooling water and the air, pollutants in the air enter the system and cause a large number of microorganisms to multiply, which will cause scaling in the system. Aggravate the adhesion and corrosion of equipment and pipeline scale, thereby reducing the cooling efficiency of the heat exchanger. Therefore, different water quality stabilization technologies should be ad...

Claims

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Application Information

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IPC IPC(8): C02F5/14
Inventor 骆军林永增张雷罗启明
Owner BAOSHAN IRON & STEEL CO LTD
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