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Corrosion inhibitor of level I reverse osmosis water for sea water desalinization

A reverse osmosis water and corrosion inhibitor technology, which is applied in the field of corrosion inhibitors for seawater desalination primary reverse osmosis water, can solve the problems of unsatisfactory corrosion inhibition effects, high operating costs, high cost of quenching and tempering technical facilities, and achieve corrosion inhibition significant effect

Active Publication Date: 2011-02-16
SUNRUI MARINE ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To sum up, the disadvantages of the existing quenching and tempering technology are that the process is complex and the equipment occupies a large area; the corrosion inhibition efficiency is not high, generally between 60-70%; foreign quenching and tempering technology facilities are expensive, and the construction of packed towers It requires high cost; conditioning with sodium bicarbonate requires a large amount of added chemicals and high operating costs; at the same time as conditioning, sodium ions are introduced into the water, which increases the salinity of the water, and the corrosion inhibition effect is not ideal. Carbon steel The corrosion inhibition efficiency under static conditions is 60%

Method used

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  • Corrosion inhibitor of level I reverse osmosis water for sea water desalinization
  • Corrosion inhibitor of level I reverse osmosis water for sea water desalinization

Examples

Experimental program
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Effect test

Embodiment 1

[0013] This embodiment relates to a corrosion inhibitor added to seawater desalination primary reverse osmosis water. The proportion of the corrosion inhibitor is as follows: sodium polyphosphate is 25pm; zinc sulfate is 10mg / L; sodium metasilicate is 5mg / L.

[0014] In this example, the static coupon corrosion weight loss test and the rotating coupon corrosion weight loss test were used to measure the corrosion rate of carbon steel before and after adding the corrosion inhibitor, and calculate the corrosion inhibition rate of the corrosion inhibitor. The corrosion inhibition effect is shown in Table 2.

Embodiment 2

[0016] This example relates to another corrosion inhibitor added to seawater desalination primary reverse osmosis water. The proportion of corrosion inhibitor is as follows: sodium polyphosphate is 75pm; zinc sulfate is 5mg / L; sodium metasilicate is 15mg / L .

[0017] In this embodiment, the static coupon corrosion weight loss test and the rotating coupon corrosion weight loss test are used to measure the corrosion rate of carbon steel before and after adding this corrosion inhibitor, and calculate the corrosion inhibition rate of the corrosion inhibitor. The corrosion inhibition effect is shown in Table 2 .

Embodiment 3

[0019] This embodiment relates to yet another corrosion inhibitor added to seawater desalination primary reverse osmosis product water, the proportion of corrosion inhibitor is as follows: sodium polyphosphate is 50pm; zinc sulfate is 8mg / L; sodium metasilicate is 10mg / L L.

[0020] In this example, the static coupon corrosion weight loss test and the rotating coupon corrosion weight loss test were used to measure the corrosion rate of carbon steel before and after adding the corrosion inhibitor, and calculate the corrosion inhibition rate of the corrosion inhibitor. The corrosion inhibition effect is shown in Table 2.

[0021] Corrosion rate and corrosion inhibition rate of table 2 carbon steel in three examples

[0022]

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Abstract

The invention belongs to the technical field of sea water comprehensive utilization and relates to a corrosion inhibitor of level I reverse osmosis water for sea water desalinization. The corrosion inhibitor can be obtained by the following steps: selecting non-toxic harmless chemical agents are as formulation ingredients, conducting formulation according to synergy and principle of complementarity among all the technical agents, and by weight-loss experiment, taking corrosion inhibition ratio as an index to evaluate and screen out the efficient corrosion inhibitor applicable to carbon steel in level I reverse osmosis product water for sea water desalinization. The formula of the corrosion inhibitor comprises the following ingredients: 25-75mg / L of sodium polyphosphate, 5-10mg / L of zinc sulfate and 5-15mg / L of sodium metasilicate. In static water, the corrosion inhibitor leads the corrosion rate of the carbon steel to be reduced to below 0.065mm / y from 0.0458mm / y and the corrosion efficiency to be larger than 85.8%; and in dynamic water with flow rate of 2m / s, the corrosion inhibitor leads the corrosion rate of the carbon steel to be reduced to below 0.027mm / y from 0.257mm / y and the corrosion efficiency to be larger than 89.5%, with obvious corrosion inhibition effect.

Description

Technical field: [0001] The invention belongs to the technical field of seawater comprehensive utilization, and relates to a corrosion inhibitor for seawater desalination primary reverse osmosis water. Background technique: [0002] At present, nuclear power plants often use reverse osmosis technology for desalination of seawater, and the water part of the first-stage reverse osmosis product is used as cooling water for fire pump bearings, fire protection water and water for green areas. During the process of seawater desalination, suspended solids and most of the dissolved salts in seawater are destroyed. Remove, the total dissolved solids (TDS) value of product water is lower than 350mg / L, wherein mainly is monovalent salts such as sodium chloride, calcium, magnesium salt content (hardness) is very low. At the same time, since the primary reverse osmosis product water contains free carbon dioxide, the pH value drops below 6, and the water contains a relatively high concent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/173
Inventor 刘光洲王海涛张茜郝少丽王洪仁
Owner SUNRUI MARINE ENVIRONMENT ENG