High-COD special non-phosphorus corrosion and scale inhibitor and preparation method thereof

Abstract

The invention provides a high-COD (Carbon Oxide Demand) special non-phosphorus corrosion and scale inhibitor and preparation method thereof. The corrosion and scale inhibitor mainly comprises cyclodextrin or cyclodextrin derivatives, a soluble metal salt, a copolymer containing a sulfonic acid group, a homopolymer containing carboxylic acid, an acrylic acid / ethyl acrylate / 2-acrylamide-2-methallylsulphonate copolymer, tetrahydroglyoxaline matters, sodium gluconate, and quaternary ammonium salt. The non-phosphorus corrosion and scale inhibitor is suitable for an open circulated cooling water system, and suitable for surface water high in COD and free of treatment, and the non-phosphorus corrosion and scale inhibitor is added into the circulated cooling water system by an automatic reagent feeding device. The non-phosphorus corrosion and scale inhibitor is environmentally-friendly, avoids using phosphorous compounds or non-renewable molybdate or tungstate, has the characteristic of being free from phosphorus and nitrogen, meets the requirement of environmental protection, reduces the environmental burden, has a sterilizing ingredient at the same time, and effectively reduces the problems of bacterial corrosion and algae growth in a circulated water system.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a non-phosphorous corrosion and scale inhibitor for circulating cooling water with high COD and a preparation method thereof. Background technique [0002] Water is the basic condition for human survival, but water resources in the world are limited. my country's per capita water volume is only a quarter of the world's per capita water volume, and water resources are even poorer. With the rapid development of industry, the ecological balance of water has been seriously damaged day by day. In order to solve the water resource crisis and adapt to sustainable development, it is necessary to save water reasonably. The amount of cooling water in industrial water accounts for 60-80% by weight of the total water consumption. Therefore, the main goal of saving industrial water is to recycle cooling water, improve the reuse rate as much as possible, and reduce sewage discharge. However, ...

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Problems solved by technology

[0004] Domestic research on phosphorus-free or low-phosphorus water treatment agents has also been carried out, but it is limited to the compound synergy research on molybdenum, silicon, tungsten, sodium benzoate, sodium gluconate, and zinc salts

Moreover, some of the currently used phosphorus-free products contain high content of molybdenum and tungsten. As we all know, molybdenum and tungsten are non-renewable mineral resources, which belong to the state-controlled minerals, and the price is high. After discharge, they cannot be biodegraded and seriously pollute the water body.

[0005] CN1754840A discloses a corrosion and scale inhibitor for industrial cooling water systems, comprising acrylic acid-acrylate-sulfonate copolymer, mercaptobenzothiazole, sodium humate, lignin and water, but sodium humate and lignin The source of the element is miscellaneous, the quality is unstable, and the treatment effect is poor; CN1609020A discloses a method for treating corrosion and scale inhibition water containing polyepoxysuccinic acid, which is to use polyepoxysuccinic acid or polyepoxysuccinic acid and gluconic acid alone Or the corrosion and scale inhibition method that gluconate and zinc salt (Zn2+) are used in conjunction, but polyepoxysuccinic acid has basically no dispersion function and corrosion inhibition function, and easily causes the deposition of zinc salt, resulting in low corrosion inhibition performance; CN101591073A discloses A non-phosphorus corrosion and scale inhibitor containing 12-16% lignin and tannin mixture, 55-65% water, 0.7-0.8% NaOH, 1.7-2.2% H2SO4 , triethanolamine 12-16%, maleic anhydride 4-6%, borax 3-5%; CN101591074A discloses a phosphorus-free water treatment agent with excellent corrosion and scale inhibition performance and effective control of microorganisms and slime hazards. Phosphorus-free corrosion and scale inhibitors in phosphorus water treatment agents are 15-25%, ternary (AMPS) 8-12%, zinc chloride 6-10%, polyma 6-10%, room temperature water 40-65% %

[0006] In addition, because the scale and corrosion inhibition products disclosed above have a high use concentration, a large amount of compounding, are not easy to compound, are difficult to detect and operate, have a narrow range of adaptation to water quality, and have poor scale and corrosion inhibition effects, they are not targeted for high COD water quality.