What are the applications of ETFE anti-corrosion coating for head spraying in the chemical industry
Information summary：As a key sealing and pressure bearing component of chemical core equipment such as pressure vessels, storage tanks, and reaction vessels, the head is widely used in various strong corrosion conditions in the chemical industry after being sprayed with ETFE coating due to its advantages of strong acid and alkali resistance, high temperature resistance, and high density. It covers multiple core proce
As a key sealing and pressure bearing component of chemical core equipment such as pressure vessels, storage tanks, and reaction vessels, the head is widely used in various strong corrosion conditions in the chemical industry after being sprayed with ETFE coating due to its advantages of strong acid and alkali resistance, high temperature resistance, and high density. It covers multiple core processes such as reaction, storage, and separation. The specific scenarios are as follows:
1. Protection of reaction vessel head: The reaction vessel is a core equipment in chemical synthesis, commonly used to complete acid-base neutralization, oxidation-reduction and other reactions. The internal head is exposed to strong corrosive media such as concentrated sulfuric acid, hydrofluoric acid, and strong alkaline solutions for a long time, and the reaction process may be accompanied by temperature rise and pressure fluctuations. After spraying ETFE coating, it can resist the erosion of various chemical media on the base material of the head and avoid the corrosion and damage of the base material, which may cause leakage of the reaction medium; Its high temperature resistance can also adapt to continuous reaction conditions below 150 ℃, and the coating surface is smooth and not easy to adhere to reaction materials, reducing the pollution of residual materials on subsequent reactions and ensuring the long-term stable operation of the reaction kettle.
2. Corrosion prevention of chemical storage tank heads: Carbon steel or stainless steel storage tanks storing liquid chemicals in the chemical industry have head areas that are stress concentrated and prone to corrosion. Tanks storing acidic and alkaline solutions such as caustic soda and hydrochloric acid, or various organic solvents, have heads that are prone to pitting and cracking when in long-term contact with corrosive media. After spraying ETFE coating, a dense protective barrier can be formed to prevent the medium from penetrating and corroding the substrate. For example, the DuPont factory once used ETFE lined steel storage tanks to store mixed waste liquids containing hydrofluoric acid and sodium hydroxide. The head coating of the tank was subjected to a certain pressure and corrosion for a long time without any leakage or corrosion failure problems.
3. Protection of distillation and absorption tower heads: Distillation and absorption towers are commonly used for the separation and purification of chemical raw materials. Various acid-base detergents or corrosive process media are used inside the tower, and temperature and pressure will periodically change during the distillation process. The head not only needs to withstand pressure, but also needs to resist the alternating corrosion of gas-liquid two-phase media. The chemical resistance of ETFE coating can cope with the erosion of complex media inside the tower, and its good mechanical flexibility can adapt to the thermal expansion and contraction of the substrate caused by temperature changes, avoiding coating cracking and peeling, ensuring the sealing performance and separation efficiency of the tower body. For example, in the application of crude oil distillation tower heads in petrochemicals, it can extend the equipment maintenance cycle.
4. Adaptation of chemical pipeline system heads and flange heads: When transporting corrosive media in chemical pipelines, the end heads and flange heads connected to the pipeline are weak sealing points, where the medium is prone to leakage and corrode the substrate. After spraying ETFE coating, it can prevent the corrosion of the head by acidic, alkaline, salt solutions, organic solvents, etc. during transportation, and also reduce the risk of medium residue and blockage at the head due to the non adhesiveness of the coating. Especially in the centralized supply pipeline network of chemical industrial parks, this coating can significantly reduce the corrosion and leakage hazards at the head area, and lower pipeline maintenance costs.
5. Head protection of waste liquid treatment equipment: Waste liquid treatment equipment in chemical enterprises, such as neutralization kettles and sedimentation tanks, require their heads to come into contact with complex industrial waste liquids, which often contain various acidic and alkaline substances, heavy metal ions, and organic pollutants, and are highly corrosive. ETFE coating can resist the erosion of mixed waste liquids and prevent waste liquid leakage and environmental pollution caused by corrosion damage to the head. The characteristic of easy cleaning of the coating at the same time facilitates regular cleaning of equipment, ensuring the continuous operation of the waste liquid treatment process, and is suitable for chemical environmental protection sections with high environmental compliance requirements.
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