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Preparation method and applications of phosphorus-free scale-inhibiting and corrosion-inhibiting agent for reusing reclaimed water in power plant

A phosphorus-free corrosion and scale inhibitor technology, applied in the field of water treatment, can solve the problems of reduced scale and corrosion inhibition effect, poor scale and corrosion inhibition effect, and poor water quality conditions, and achieves excellent sterilization effect, corrosion inhibition and resistance. Improved scaling performance, good stability and good water solubility

Inactive Publication Date: 2016-12-21
BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effect is poor for systems that use poor water bodies such as urban regeneration and reuse systems or polluted water sources as circulating cooling water. On the one hand, the reclaimed water quality is poor, the water body has high scaling and corrosive ion content, and the scaling and corrosion tendencies are greater than Fresh water; on the other hand, the concentration of suspended solids in the water is relatively high, so that a large amount of chemicals are adsorbed on the suspended particles, and the effect of scale and corrosion inhibition is reduced; and the content of COD and BOD in reclaimed water is high, and COD can reach 30-50mg / L, BOD 5 It can reach about 10mg / L, and the microbial reproduction is more serious than fresh water
These have led to the decline of the performance of general scale and corrosion inhibitors in harsh water bodies such as reclaimed water reuse systems or polluted water sources, and the effect of scale and corrosion inhibition is poor.

Method used

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  • Preparation method and applications of phosphorus-free scale-inhibiting and corrosion-inhibiting agent for reusing reclaimed water in power plant
  • Preparation method and applications of phosphorus-free scale-inhibiting and corrosion-inhibiting agent for reusing reclaimed water in power plant
  • Preparation method and applications of phosphorus-free scale-inhibiting and corrosion-inhibiting agent for reusing reclaimed water in power plant

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preparation example Construction

[0021] The preparation method of the non-phosphorus corrosion and scale inhibitor that the reclaimed water proposed by the present invention is reused in the power plant comprises the following steps:

[0022] (1) Polyepoxysuccinic acid, polymaleic acid, sodium gluconate and zinc sulfate are weighed in proportion, and the mass percent is:

[0023]

[0024] The mass percent concentration of the polymaleic acid is 45% to 55%, and the free monomer of maleic acid is ≤9.0wt%;

[0025] The mass percent concentration of the polyepoxysuccinic acid is 30%-40%, and the degree of polymerization is 5-10.

[0026] (2) Mix polyepoxysuccinic acid, polymaleic acid and sodium gluconate weighed according to the above ratio, heat to 70-90°C, and keep for 1.5-2.0 hours to obtain the first solution;

[0027] (3) the zinc sulfate that weighs by above-mentioned ratio is mixed with the zinc sulfate aqueous solution that mass concentration is 10%~20%, in the first solution of above-mentioned step ...

Embodiment 1

[0043] (1) Polyepoxysuccinic acid, polymaleic acid, sodium gluconate and zinc sulfate are weighed in proportion, and the mass percent is:

[0044] Polyepoxysuccinic acid (PESA) 54%,

[0045] Polymaleic acid (HPMA) 29%,

[0046] Sodium Gluconate 8.5%,

[0047] Zinc sulfate 8.5%.

[0048] (2) Mix polyepoxysuccinic acid, polymaleic acid and sodium gluconate weighed according to the above ratio, heat to 90°C, and keep for 2.0 hours to obtain the first solution;

[0049](3) the zinc sulfate weighing by the above-mentioned ratio is mixed with the zinc sulfate aqueous solution that mass concentration is 10%, in the first solution of above-mentioned step (2), this zinc sulfate aqueous solution is added dropwise, carries out ultrasonic treatment 20 minutes, obtains the second Two solutions;

[0050] (4) Filtrate the above-mentioned second solution, cool the filtrate to normal temperature, and obtain regenerated water to be reused as a phosphorus-free corrosion and scale inhibitor f...

Embodiment 2

[0052] (1) Polyepoxysuccinic acid, polymaleic acid, sodium gluconate and zinc sulfate are weighed in proportion, and the mass percent is:

[0053] Polyepoxysuccinic acid (PESA) 55%,

[0054] Polymaleic acid (HPMA) 30%,

[0055] Sodium Gluconate 10%,

[0056] Zinc sulfate 5%.

[0057] (2) Mix polyepoxysuccinic acid, polymaleic acid and sodium gluconate weighed according to the above ratio, heat to 80°C, and keep for 1.5 hours to obtain the first solution;

[0058] (3) the zinc sulfate weighing by the above-mentioned ratio is mixed with the zinc sulfate aqueous solution that mass concentration is 15%, in the first solution of above-mentioned step (2), this zinc sulfate aqueous solution is added dropwise, carries out ultrasonic treatment 15 minutes, obtains the second Two solutions;

[0059] (4) Filtrate the above-mentioned second solution, cool the filtrate to normal temperature, and obtain regenerated water to be reused as a phosphorus-free corrosion and scale inhibitor for...

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Abstract

The invention relates to a preparation method and applications of a phosphorus-free scale-inhibiting and corrosion-inhibiting agent for reusing reclaimed water in a power plant, and belongs to the technical field of water treatment. The phosphorus-free scale-inhibiting and corrosion-inhibiting agent comprises, by mass, 45-65% of polyepoxysuccinic acid, 25-45% of polymaleic acid, 5-15% of sodium gluconate, and 5-15% of zinc sulfate. According to the present invention, various components provide the synergistic effect, the scale-inhibiting and corrosion-inhibiting performance can be substantially improved after the compounding of various components, the phosphorus-free scale-inhibiting and corrosion-inhibiting agent can be used in the wide water supply pH value range and the wide temperature range, the production process is simple, no pollutant is discharged during the preparation process, the stability and the water-solubility are good, the main components can be biodegradable, and the phosphorus-free scale-inhibiting and corrosion-inhibiting agent further has advantages of no toxicity, no phosphorus, less consumption, and environmental protection.

Description

technical field [0001] The invention relates to a preparation method and application of a phosphorus-free corrosion and scale inhibitor for reclaimed water reuse in power plants, and belongs to the technical field of water treatment. Background technique [0002] With the increasing shortage of fresh water resources, urban recycled water is gradually applied to the industrial field. At present, many power plants use recycled water instead of fresh water as supplementary water for the circulation system, especially in northern China. [0003] At present, the conventional circulating cooling water treatment agent system is often used in combination with organic phosphates and polymers. From the actual use situation, general agents can play a better role in scale inhibition and slowing down of circulating cooling water systems with better water quality conditions. erosion. However, the effect is poor for systems that use poor water bodies such as urban regeneration and reuse s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F103/02
CPCC02F5/105C02F2103/023C02F2303/04C02F2303/08
Inventor 陈兆林张鸿涛薛方勤汪诚文赵雪峰
Owner BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA
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