Non-phosphorus environment-friendly softening water corrosion inhibitor

A kind of corrosion inhibitor and environmental protection technology, applied in the field of soft water closed circulation system, can solve the problems of high concentration of corrosion inhibitor dosing, high water treatment cost, high water quality requirements, and achieve good corrosion inhibition effect, long effective time, dissolution high sex effect

Active Publication Date: 2013-08-28
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0011] Silicate corrosion inhibitors are non-toxic and non-polluting, but they are used in large quantities, have high requirements on water quality, are prone to pitting corrosion, and will produce silicate scale if they are not well controlled, so they are rarely used
Existing silicon-based soft water corrosion inhibitors such as the patent No. 89106699 "Silicon-based corrosion inhibitors for closed circulation cooling water treatment" applied by Taiyuan Iron and Steel Company on September 5, 1989, its formula is sodium silicate (SiO2) 1500- 3000ppm, hydroxyethylidene diphosphate 20-50ppm, sodium gluconate 200-400ppm, benzotriazole 1-3ppm, the concentration of corrosion inhibitor is high, so the cost of water treatment is high

Method used

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preparation example Construction

[0025] A phosphorus-free environment-friendly soft water corrosion inhibitor is characterized in that the corrosion inhibitor is prepared by the following method,

[0026] Dissolve 20-40% sodium gluconate and 20-45% sodium benzoate in water, then add 5-10% polyaspartic acid graft copolymer containing hydroxyl, stir well and then add 1-3% benzotriazole and continue to stir, finally add 5-10% dispersant and stir evenly.

[0027] The benzotriazole can also be mercaptobenzothiazole, and the concentration of the medicament used remains unchanged. The chemical concentration is 2ppm, which is not used as a test factor for metal corrosion and corrosion inhibition.

[0028] The dispersant is propylene tricarboxylic acid-allyl sulfonic acid copolymer,

[0029] The corrosion test adopts the determination of the corrosion inhibition performance of water treatment agents-rotary coupon method, this method is the national standard GB / T18175-2000 of the People's Republic of China, the instr...

Embodiment 1

[0039] The 150-ton converter oxygen lance closed circulation system, the soft water is the reverse osmosis softened water produced by the power plant, the temperature of the incoming water is 40 degrees, and the temperature of the return water is 50 degrees. The cooling equipment adopts a plate heat exchanger. The formula is polyaspartic acid graft copolymer containing hydroxyl group 5ppm, sodium gluconate 25ppm, sodium benzoate 25ppm, dispersant 3ppm, benzotriazole or mercaptobenzothiazole 2ppm, this formula is in the converter closed loop system It has been used for 4 years, the content of iron ions in the circulating water is less than 1mg / l, the turbidity is less than 10mg / l, the system runs stably, there are four groups of coupons in the circulating water system, the selected time is 3 months and 6 months, after The monitoring results show that the surface of the coupons is smooth, free of pitting, scale and slime, and the corrosion rate of the coupons is between 0.0036-0....

Embodiment 2

[0041]The 2200m3 blast furnace adopts a soft water closed circulation system. The soft water used is ion exchange resin softened water. The soft water corrosion inhibitor used is the soft water corrosion inhibitor of the present invention. The formula is 3 ppm of hydroxyl-containing polyaspartic acid graft copolymer, glucose sodium benzoate 30ppm, sodium benzoate 20ppm, dispersant 4ppm, benzotriazole or mercaptobenzothiazole 2ppm. The blast furnace was put into operation in 2008, and the iron ion content in the soft water circulation system of the blast furnace was gradually reduced from 8-9mg / l to 1-2mg / l after dosing, reaching the industry standard. During operation, there are 6 groups of coupons hanging in the pipeline. From the observation of the taken out coupons, there is no obvious corrosion phenomenon on the surface, which is almost the same as the initial state. The surface is metallic and the corrosion rate is 0.0040-0.0071mm / Between a and fully comply with the prov...

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Abstract

The invention relates to a non-phosphorus environment-friendly softening water corrosion inhibitor which is characterized in that the corrosion inhibitor is prepared by adopting the following method. The method comprises the steps of: dissolving 20-40% of sodium gluconate and 20-45% of sodium benzoate into water, then adding 5-10% of hydroxyl-containing polyaspartic acid grafted copolymer, evenly stirring, then adding 1-3% of benzotriazole, stirring, and finally adding 5-10% of dispersing agent and evenly stirring. The prepared corrosion inhibitor is a non-phosphorus environment-friendly softening water corrosion inhibitor applicable to a softening water system, and is good in property, economical, non-phosphorus, non-toxic and environment-friendly.

Description

technical field [0001] The invention relates to a phosphorus-free environment-friendly soft water corrosion inhibitor used in a water treatment system, which is mainly aimed at a soft water closed circulation system. Background technique [0002] Water resources are irreplaceable natural resources. my country is short of water resources, and the per capita water resources are a quarter of the world's average level. It is a country with severe water shortages. Therefore, the rational use and development of water resources and water conservation have become the most critical link in the protection of water resources and the realization of sustainable economic and social development. [0003] The iron and steel industry is a large water user. The state promulgated the "Water Conservation Law of the People's Republic of China" and proposed the "Water-saving Design Specifications for Iron and Steel Enterprises". Circulating cooling water is easy to scale or corrode, thus affecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12
Inventor 郭茹辉刘振法张利辉李晓辉赵军平
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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