Ecological water treatment chemical with both corrosion inhibition and scale inhibition performances

Abstract

The invention discloses an ecological water treatment chemical with both corrosion inhibition and scale inhibition performances. The ecological water treatment chemical comprises beta-dicarbonyl compound modified polyaspartic acid used as a main agent, and sodium molybdate, hydroxyethylidene diphosphonic acid and zinc salts used as auxiliary agents. The ecological water treatment chemical of the invention can be applied to a circulating cooling water treatment system, and has excellent corrosion and scale inhibition performances; the chemical has a calcium carbonate inhibition rate of 100% andan annual A3 carbon steel corrosion rate of less than 0.075 mm; the concentration of Zn<2+> in discharged water is 0-1.5 mg / L, and the content of phosphorus in the discharged water is 0-0.05 mg / L; soharm to the environment due to high contents of phosphorus and zinc is avoided, and increasingly strict environmental protection requirements are met.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to an ecological water treatment chemical with both corrosion inhibition and scale inhibition properties. Background technique [0002] For a long time, the shortage of water resources and low reuse rate have been a major problem facing our country. In order to better save water resources, the industry usually uses circulating cooling water technology to reuse water resources. Although this method can save water, scaling and corrosion will occur during the water cycle, which will affect the normal use of equipment in industrial production. To address the above corrosion and scaling problems, adding scale and corrosion inhibitors to the circulating cooling water system is currently the most common and effective method. [0003] With the increasing demand for environmentally friendly water treatment chemicals in industrial circulating cooling water systems, polyaspartic aci...

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Problems solved by technology

However, the invention involves many phosphorus-containing agents, and the organic solvents are toxic substances such as toluene, which is not conducive to the personal safety of the experimenters, and puts pressure on the protection of the ecological environment, and once industrialized production will be caused by the recovery of phosphorus. Additional economic loss; patent CN105621641A provides a compound scale inhibitor of polyaspartic acid and ethylenediamine tetramethylene phosphonic acid, the raw materials used in this product include: maleic anhydride 26% to 28% , 51% to 53% ammonia water, 2% mixture of iron oxide and nickel oxide, 13% ethylenediamine tetramethylene phosphonic acid, and the balance is sodium hydroxide aqueous solution, which is produced by mixing at a certain temperature. Aspartic acid and ethylenediaminetetramethylenephosphonic acid compound scale inhibitor, the consumption of raw material ammonia water in this patent is relatively large, and ammonia water itself has a certain pungent smell, corrosiveness and toxicity, and there will be safety hazards when used in large quantities , in addition, there is also the recovery problem of catalyst iron oxide and nickel oxide; patent CN108085689A discloses a preparation method of a novel seawater corrosion inhibitor, selects polyaspartic acid as the main raw material of the environment-friendly seawater corrosion inhibitor, and then combines with Zinc sulfate heptahydrate, 2-hydroxyphosphonoacetic acid and hexadecyldimethyl (2-sulfite) ethyl ammonium and other corrosion inhibitors are compounded, and then the improved organic compound epoxy sodium hydrogen succinate is added to pass The synergistic effect between the two enhances its corrosion inhibition performance, but from the final corrosion inhibition data, the corrosion inhibition effect is not very ideal

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