Phosphorus-free corrosion-retarding scale inhibitor used for industrial circulating cooling water

Abstract

The invention relates to a practical and environment-friendly phosphorus-free corrosion-retarding scale inhibitor used for industrial circulating cooling water. The scale inhibitor is characterized in that the scale inhibitor comprises components of, by weight: 10-40% of N-alkyl-N-fat phthalein amino fatty acid salt, 5-25% of hydroxyl carboxylate, 5-20% of a carboxylic acid copolymer, 1-4% of metal salt, and balance of water. The mass percentage concentration of the N-alkyl-N-fat phthalein amino fatty acid salt is 12-38%, the N-alkyl-N-fat phthalein amino fatty acid salt is selected from sodium salt or potassium salt. The polyhydroxyl carboxylate is selected from sodium gluconate, sodium lactobionate, and sodium malate. The mass percentage concentration of the polyhydroxyl carboxylate is 8-22%. The carboxylic acid copolymer is selected from acrylic acid-AMPS-methylacrylsulfonate copolymer, polymaleic acid, polyaspartic acid, and polyaminosuccinic acid. The mass percentage concentration of the carboxylic acid copolymer is 8-22%. The metal salt is selected from zinc salt, chromate, silicate, molybdenate, and tungstate. The mass percentage concentration of the metal salt is 1-5%.

Description

technical field [0001] The invention relates to a scale inhibitor, in particular to a phosphorus-free corrosion and scale inhibitor for industrial circulating cooling water. Background technique [0002] Among all kinds of water, industrial water accounts for a high proportion, and it is an area with serious waste. The water reuse rate is only 30% in some places, and industrial circulating cooling water, as the main component of industrial water, accounts for about More than 55% of the total water. Improving the level of circulating cooling water treatment and strengthening water-saving measures is an important way to control industrial water waste and save water. Industrial circulating cooling water technology is one of the important means to save industrial water, but the scaling and corrosion of water pipes and heat exchangers is a major difficulty in industrial circulating cooling water technology. Demineralized water is widely used in closed circulation cooling system...

AI Technical Summary

Problems solved by technology

Due to the relationship between phosphorus-based chemicals and calcium hard ions, the performance of phosphorus-based chemicals in such ultra-low hardness water is not good, and water treatment is more difficult.

Most of the existing water treatment methods are mainly based on metal salt corrosion inhibitors, supplemented by phosphorus-based chemicals, etc., due to the use of metal salt compounds in this method, the cost is high, the sewage pollution is serious, and at the same time, it is also a waste of natural mineral resources. , is not conducive to sustainable development

Or by adding calcium chloride to increase the concentration of calcium ions to cooperate with the use of phosphorus-based formulas. This method will cause eutrophication of the water body and cause environmental damage due to the high phosphorus content in the agent.