Introduction

Under the background of increasingly severe environmental protection and water resource shortage, efficient and environmentally friendly water treatment technology and electroplating additives are particularly important.Etidronic acid(HEDP), as a kind of organic phosphoric acid with excellent properties, has shown great application potential in the water treatment and electroplating industry with its unique molecular structure and excellent properties. In this paper, the chemical properties, synthetic methods, application fields, and environmental significance of etidronic acid will be introduced comprehensively and deeply.

Chemical properties

Etidronic acid, The chemical form is C?H?O?P?, With a molecular weight of 206.03, it is a white crystalline particle. It is soluble in water, and soluble in methanol and ethanol, forming a colorless to yellowish liquid. It is a multicomponent acid with strong chelating ability and can form stable complexes with metal ions, thus playing a role in scale inhibition and corrosion inhibition in water treatment. In addition, Can also form stable adducts with compounds containing active oxygen to keep active oxygen stable, showing its excellent chemical stability.¹

Synthesis method

The main synthesis methods of etidronic acid are glacial acetic acid and phosphoryl trichloride futures. It was prepared by condensation reaction of acylation product and phosphorous trichloride hydrolysate. During the synthesis process, conditions such as reaction temperature, reaction time, and material ratio need to be strictly controlled to ensure the quality and yield of the product. In addition, the by-products produced during the synthesis process, such as hydrogen chloride, need to be recovered by condensation and absorption towers to reduce environmental pollution.²

Application fields

Water treatment field

Etidronic acid has been widely used in the field of water treatment. It can be used as a scale inhibitor and corrosion inhibitor for boilers and heat exchangers, effectively preventing the generation of scale and corrosion, and improving the service life and efficiency of equipment. In addition, It can also be used in power, chemical industry, metallurgy, fertilizer and other industrial circulating cooling water systems, medium and low-pressure boilers, oil field water injection, and oil pipeline scale and corrosion inhibition. Its unique molecular structure and excellent properties make it irreplaceable in these fields.³

Electroplating field

Etidronic acid is also an excellent cyanide-free complexing agent for electroplating. During electroplating, Etidronic acid can form stable complexes with metal ions, thus improving the quality and binding force of electroplated parts. At the same time, it can also reduce energy consumption and pollution emissions in the plating process, in line with the development requirements of green environmental protection.⁴

Other fields

In addition to water treatment and electroplating, Etidronic acid can also be used as metal and non-metal cleaning agents in the textile industry, peroxide stabilizers, and color fixing agents in the bleaching industry. Its high purity and stable chemical properties make it have broad application prospects in these fields.⁵

Environmental significance

Etidronic acid, as an efficient and environmentally friendly auxiliary for water treatment and electroplating, has obvious environmental significance. First of all, it can effectively prevent the generation of scale and corrosion in water treatment, and reduce the waste of water resources and equipment damage; Secondly, the electroplating process can reduce energy consumption and pollution emissions, in line with the development requirements of green environmental protection; Finally, as a high-purity chemical, produces less waste during its production and use and has less impact on the environment. Therefore, It plays an important role in promoting the development of green environmental protection.

Development trends and challenges

With the continuous improvement of environmental awareness and the continuous improvement of environmental regulations, the market demand for etidronic acid as an efficient and environmentally friendly water treatment and electroplating assistant will continue to grow. In the future, with the continuous progress of technology and the reduction of costs, the application field of it will be further expanded. However, there are also some challenges in the development process, such as environmental pollution in the production process and stability of product quality. Therefore, it is necessary to continuously strengthen technology research and development and quality management to promote the sustainable development of etidronic acid.

Conclusion

Etidronic acid as an efficient and environmentally friendly water treatment and electroplating assistant, plays an important role in promoting the development of green environmental protection. In this paper, its chemical properties, synthesis methods, application fields, and environmental protection significance were introduced comprehensively and deeply. It is believed that with the continuous progress of technology and the continuous expansion of the market, It will play a more important role in the future