Special slow corrosion and scale inhibitor for surface evaporation air cooling

Abstract

A retarding-corrosion antiscaling compound for the surface-evaporating air cooler used in high-hardness and high-basicity circulating water system is prepared from zinc sulfate 15-25 wt. portions, acrylic acid-acrylate copolymer 30-36 portions, hydroxy-1-1-ethylene diphosphonic acid 34-46 portions, and benzotriazole 4-6 portions. It still exhibits good performance under the condition of relatively bad quality of circulating water. Its advantages are its effect little affected by turbidity, adapting to wide pH range, high effect, and low dosage.

Description

Technical field [0001] The invention relates to a high-efficiency corrosion and scale inhibitor formula, which is mainly used for corrosion and scale inhibition in circulating water systems with high hardness and high alkalinity, specifically, in oil refinery surface evaporation air-cooled cooling water systems The surface evaporative air-cooled special corrosion and scale inhibitor used. Background technique [0002] At present, there is a serious problem of corrosion and scaling in domestic petrochemical plants' surface evaporative air-cooled water systems. Since the cooling water used in most surface evaporative air-cooling equipment is of high hardness and high alkalinity, the water treatment agent of this circulating water system still adopts the treatment method of inorganic polyphosphorus plus zinc, but the treatment effect is not ideal, mainly manifested as : 1) Since the inorganic polyphosphorus itself is easily decomposed into phosphate at a relatively high temper...

AI Technical Summary

Problems solved by technology

Since the cooling water used in most surface evaporative air-cooling equipment is of high hardness and high alkalinity, the water treatment agent of this circulating water system still adopts the treatment method of inorganic polyphosphorus plus zinc, but the treatment effect is not ideal, mainly manifested as : 1) Since the inorganic polyphosphorus itself is easily decomposed into phosphate at a relatively high temperature (50°C), the corrosion inhibition performance of the phosphate itself is limited and the scale that is easy to form phosphate is deposited on the surface of the cooling equipment to form a new corrosion structure. Therefore, the corrosion and scale inhibition performance of the commonly used water treatment formulations cannot meet the production needs under high hardness and high alkalinity water quality conditions; lead to higher costs

[0003] At present, there is no anti-corrosion and anti-scaling agent to solve this problem. In practical applications, there is no special anti-corrosion and anti-scaling agent that can inhibit surface evaporation and air-cooling corrosion and scaling.