Low-phosphorus antiincrustation corrosion inhibitor and its use

Abstract

This invention relates to a sort of low-phosphor scale-corrosion inhibitor which comprises 2-phospinobutane-1, 2, 4-tricarboylic acid (PBTCA) (or / and 2-hydroxyphonoacetic acid (HPAA)), zinc salts, molyadate or tungstate and carboxyl-containing copolymer, copper corrosion inhibitor (needed or not conditionally). This low-phosphor scale-corrosion inhibitor can be used to treat recirculated cooling-water in ways such as adjusting pH of high-hardness and high-alkalinity water or treating low-alkalinity and low-hardness water. Its phosphor concentration in recirculated water is no more than 1mg / L, reducing the hazard of phosphor discharge to environment.

Description

technical field

[0001] The invention relates to a low-phosphorus composite scale and corrosion inhibitor and its application in circulating cooling water treatment. Background technique

[0002] Circulating cooling water treatment mainly solves the three problems of scaling, corrosion and microbial hazards in the circulating water system. In order to achieve this purpose, a water treatment formula suitable for water quality conditions must be screened out. The water treatment formula has been developed from the earliest chromium and phosphorus systems to all-organic, organic zinc salt and molybdenum system formulas; the circulating water treatment method has also transitioned from a single acidic method that inhibits corrosion to an alkaline method that does not adjust the pH value. Table 1 lists the development process of cooling water treatment formulations in Japan.

[0003] Era corrosion inhibitor Inhibitor 1950-1959 Polyphosphate...