Application of titanium in chlor-alkali industry

Titanium is widely used in many sectors due to its excellent corrosion resistance, mechanical properties and process properties. Especially in chemical production, titanium instead of stainless steel, nickel-based alloys and other precious metals as a corrosion resistant material, which increases the yield, improve product quality, extend equipment life, reduce consumption, reduce energy consumption, reduce costs, prevent Pollution, improved working conditions and increased productivity are all important. In recent years, the range of titanium used in China's chemical industry has been expanding, and the amount of use has increased year by year. Titanium has become one of the main anti-corrosion materials in chemical equipment. Titanium has established its position as a corrosion-resistant structural material used in chemical plants, and as an ideal material in chemical equipment, titanium has increasingly attracted the attention of engineers and technicians.

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 the corrosion resistance of titanium to chloride ions is superior to that of commonly used stainless steels 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 scrubbing towers, and the like. In the past, the main components of these equipments used non-metallic materials (such as graphite , polyvinyl chloride, etc.). Due to the poor mechanical properties, thermal stability and processing performance of non-metallic materials, the equipment was cumbersome, energy-intensive and short-lived. And affect product quality and pollute the environment.

Therefore, since the 1970s, China has successively replaced the graphite electric trough with metal anode electric tank and ion film electric trough, and replaced the graphite cooler with titanium wet chlorine cooler, which has achieved good results. For example: the application of titanium wet chlorine cooler. Salt electrolysis production of caustic soda is to produce a large amount of high temperature wet chlorine gas, the temperature is generally 75 ~ 95 ° C, need to be cooled and dried before use.

The production of chlorine gas from China's salt electrolysis has previously affected the production and quality of chlorine gas due to unreasonable cooling processes or corrosion problems of cooling equipment, and it has also seriously polluted the environment. The titanium cooler, which is resistant to high temperature wet chlorine gas, is put into production, which changes the production appearance of chlorine in the chlor-alkali industry. Titanium is extremely resistant to corrosion in high temperature wet chlorine atmosphere. The corrosion rate of titanium in chlorinated water at normal temperature is 0.000565mm/a; in chlorine water at 80 °C, the corrosion rate of titanium is 0.00431mm/a; in 95% In wet chlorine gas, the corrosion rate of titanium at room temperature is 0.00096 mm/a. Many chlor-alkali applications often use titanium wet chlorine gas coolers, some of which have been in use for almost 20 years and are still intact.