Environment-friendly anti-scale corrosion inhibitor suitable for copper-iron system of circulating cooling water system

Abstract

The invention discloses an environment-friendly anti-scale corrosion inhibitor composition suitable for a circulating cooling water copper-iron system of an industrial heat exchange system. The composition is prepared from, by weight, 20-30% of polyaspartic acid, 15-20% of ethylenediamine tetra methylenephosphonic acid, 10-15% of quaternary ammonium bis-imidazoline, 10-20% of sodium N-lauroylsarcosinate, 5-10% of methylbenzotriazole and the balance water. The composition has the advantages that an obvious function is achieved on circulating cooling water under the conditions of high temperature, various pH values and high Cl-concentration; the scale inhibition rate of CaCO3 reaches 94.6%, the corrosion rate of A3 carbon steel is reduced to 0.00894 mm / a, and the corrosion rate of T2 red copper is reduced to 0.0011 mm / a.

Description

technical field [0001] This patent relates to the technical field of corrosion inhibitors, more specifically a scale and corrosion inhibitor. Background technique [0002] At present, for large-scale heat exchange systems such as central air-conditioning circulating cooling water systems, as well as industrial circulating cooling water systems such as fertilizers, electric power, chemical industry, and metallurgy, the main water sources are urban reclaimed water and groundwater. Due to the large water demand and low water quality, therefore Often high in Ca 2+ , Cl - wait. During the heat exchange process of circulating cooling water, due to the existence of three processes of evaporation heat dissipation, contact heat dissipation and radiation heat dissipation, various substances in the water are continuously concentrated, and the water quality deteriorates with the increase of the concentration multiple, resulting in scaling of the system, Corrosion is a serious problem...

AI Technical Summary

Problems solved by technology

However, although traditional scale inhibitors have good scale inhibition performance, they contain high phosphorus content, which will cause water eutrophication and other problems after the sewage is discharged.

Although some new scale inhibitors are easy to degrade, they generally have poor scale inhibition performance and poor adaptability to water quality, which cannot meet the scale prevention requirements of circulating cooling water systems

The performance of traditional corrosion inhibitors is good, but most of the performances are relatively single, and often only have good corrosion inhibition performance for a single metal system, but poor corrosion inhibition performance for multi-metal systems

Therefore, for the heat exchange equipment and auxiliary equipment of the multi-metal system, the traditional single scale and corrosion inhibitors cannot meet the requirements of environmental friendliness and performance