The chlor-alkali industry, a chemical sector with over a century of history, primarily produces chlorine and caustic soda through the electrolysis of saline solution. In this field, the application of titanium and titanium alloys plays a crucial role. From early experiments to their widespread use today, titanium materials have become indispensable in the chlor-alkali industry. Titanium equipment is extensively used in various key processes of chlor-alkali production, including metal anode electrolyzers, ion membrane electrolyzers, and tubular wet chlorine coolers. Notably, in the United States, more than half of the heat exchangers used in chlorine production are made from titanium, and all new heat exchangers are manufactured using titanium. This clearly demonstrates the vital importance of titanium materials in the chlor-alkali industry.
The chlor-alkali production process has undergone numerous transformations, with the application of titanium equipment and titanium tubes evolving alongside these changes. Titanium plays a key role in several stages, such as the anolyte circulation system, brine system, and dechlorination system. Additionally, titanium pumps are widely used to transport refined brine, anolyte, and other media. For a single 10,000-ton plant, around 8 tons of titanium are required, highlighting the significant demand for titanium in the chlor-alkali industry.
Titanium has many specific applications in the chlor-alkali industry, mainly including:
Electrolyzers: Titanium anode is the main part of the electrolyzer, which is core equipment in the chlor-alkali industry, are used to electrolyze saline solution to produce chlorine and caustic soda. Due to its excellent corrosion resistance, titanium is widely used in the manufacturing of these devices.
Cooling equipment: Tubular wet chlorine coolers are used to cool the hot, wet chlorine gas produced during electrolysis, allowing it to be further processed and utilized. Titanium exhibits outstanding corrosion resistance in the high-temperature, wet chlorine environment, making it an ideal material for manufacturing these coolers.
Preheating and heating equipment: Titanium is used in devices such as refined brine preheaters, which raise the temperature of the brine entering the electrolyzer to improve electrolysis efficiency. The use of titanium ensures the stable transfer of media at high temperatures and extends the service life of the equipment.
Dechlorination systems: Dechlorination towers and other equipment are used to treat chlorine-containing wastewater or gases, reducing environmental pollution. Titanium’s excellent corrosion resistance and stability make it widely used in these dechlorination systems.
Conveyance systems: Titanium pumps and titanium valves are employed to transport refined brine, anolyte, and other media. The corrosion resistance of titanium ensures the safe and stable conveyance of media while enhancing the overall performance of the system.
The advantages of titanium materials in the chlor-alkali industry are also significant. In particular, titanium demonstrates extremely high corrosion resistance during the cooling process of hot, wet chlorine gas. Experimental data shows that titanium’s annual corrosion rate in high-temperature, wet chlorine environments is only 0.0025 mm, which is far lower than other materials. As a result, using titanium coolers not only shortens the cooling and drying process, reduces chlorine loss, but also minimizes environmental pollution, creating favorable conditions for stable operation of compressed gas and achieving high levels of dryness.
In China, the application of titanium in the chlor-alkali industry has also achieved remarkable success. From the production of the first titanium cooler in 1965 to the widespread use of hundreds of tubular titanium coolers today, titanium’s contribution to the chlor-alkali industry has become increasingly evident.
In conclusion, the application of titanium and titanium alloys in the chlor-alkali industry is not only extensive but also highly advantageous, covering almost every stage of chlor-alkali production. Its superior corrosion resistance, stability, and processability make titanium an indispensable material in the chlor-alkali industry. As the chlor-alkali industry continues to develop, the prospects for titanium applications will become even more promising.