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This post was last edited by sunjl1981 on 2013-1-6 20:04 Because titanium has excellent corrosion resistance, mechanical properties and process properties, it is widely used in many sectors of the national economy. Especially in chemical production, titanium is used to replace stainless steel, nickel-based alloys and other rare metals as corrosion-resistant materials, which is of great significance in increasing output, improving product quality, extending equipment service life, reducing consumption, reducing energy consumption, reducing costs, preventing pollution, improving working conditions and increasing productivity. In recent years, the scope of titanium used in my country's chemical industry has been continuously expanding, and its usage has increased year by year. Titanium has become one of the main anti-corrosion materials in chemical equipment. As a corrosion-resistant structural material used in chemical equipment, titanium has established its status. As an ideal material in chemical equipment, titanium has attracted more and more attention from engineering and technical personnel. Chlor-alkali industry The chlor-alkali industry is an important basic raw material industry, and its production and development have a great impact on the national economy. This is because titanium's corrosion resistance to chloride ions is better than commonly used stainless steel and other non-ferrous metals. At present, titanium is widely used in the chlor-alkali industry to manufacture metal anode electrolyzers, ion membrane electrolyzers, wet chlorine coolers, refined brine preheaters, dechlorination towers, chlorine gas cooling and washing towers, etc. In the past, the main components of these equipment were mostly made of non-metallic materials (such as graphite, polyvinyl chloride, etc.). Due to the unsatisfactory mechanical properties, thermal stability and processing performance of non-metallic materials, the equipment was bulky, energy-consuming and short-lived, affecting product quality and polluting the environment. Therefore, since the 1970s, my country has successively replaced graphite batteries with metal anode batteries and ion membrane batteries, and replaced graphite coolers with titanium wet chlorine coolers, all of which have achieved good results. For example: Applications of titanium wet chlorine coolers. The electrolysis of salt to produce caustic soda produces a large amount of high-temperature wet chlorine gas. The temperature is generally between 75 and 95°C, and it needs to be cooled and dried before it can be used. In the past, the production of chlorine produced by electrolysis of table salt in my country had affected the output and quality of chlorine due to unreasonable cooling process or corrosion problems of cooling equipment, and also seriously polluted the environment. Titanium coolers resistant to corrosion by high-temperature wet chlorine gas were put into production, changing the production face of chlorine production in the chlor-alkali industry. Titanium is extremely resistant to corrosion in high-temperature, wet chlorine environments. In chlorine water at room temperature, the corrosion rate of titanium is 0.000565mm/a; in chlorine water at 80°C, the corrosion rate of titanium is 0.00431mm/a. ； In an atmosphere containing 95% wet chlorine, the corrosion rate of titanium at room temperature is 0.00096mm/a. Many chlor-alkali plants often use titanium wet chlorine coolers, some of which have been used for nearly 20 years and are still in good condition. .Note ← ) # ← , .