Titanium has excellent corrosion resistance and mechanical properties, is widely used in many departments. In particular chemical applications, can be used instead of stainless steel with titanium as a corrosion-resistant material, which extend the life of equipment, reduce costs, prevent pollution and improve productivity and so has a great significance. In recent years, China's chemical industry by expanding the scope of titanium, the amount increases every year, titanium has become one of the major chemical equipment corrosion resistant materials. Titanium as a chemical plant in a corrosion-resistant structural materials for chemical equipment has become an ideal material.

Chlor-alkali industry

     Chlor-alkali industry is an important basic raw material industry, a great impact on their production and development of the national economy. This is because the titanium chloride for superior corrosion resistance of stainless steel and other non-ferrous metals used. Chlor-alkali industry is currently widely used to produce titanium metal anodes, ion-exchange membrane electrolyzer, wet chlorine cooler, refined salt water preheater tower dechlorination, chlorine wash cooling tower. The main components of these devices in the past to use more non-metallic materials (such as graphite, polyvinyl chloride, etc.), due to the mechanical properties of non-metallic materials, thermal stability and processing performance is not ideal, resulting in heavy equipment, energy consumption, short life and affect product quality and pollute the environment. Therefore, China since the 1970s, began with a metal anode and membrane electrolyzer replace graphite electric tank, with titanium wet chlorine cooler cooler instead of graphite, have achieved good results.

For example: titanium wet chlorine cooler applications. Salt electrolytic production of caustic soda to produce large amounts of high temperature and wet chlorine, temperature is generally 75 ~ 95 ℃, need to go through the cooling and drying before use. Our salt electrolysis production of chlorine, since before the cooling process is unreasonable or cooling equipment due to corrosion problems affecting the chlorine yield and quality, but also seriously pollute the environment. High temperature corrosion of titanium wet chlorine cooler into production, changing the chlor-alkali industry in the preparation of chlorine production outlook. Titanium wet chlorine gas at an elevated temperature environment excellent in corrosion resistance, titanium in chlorinated water of the normal temperature, the corrosion rate is 0.000565mm / a; 80 ℃, in chlorinated water, the corrosion rate of titanium was 0.00431mm / a; containing 95% wet chlorine gas, the corrosion rate of titanium at ambient temperature 0.00096mm / a. Many chlor often applied titanium wet chlorine cooler, and some have been used for nearly 20 years, is still intact.

Soda Industry

     Soda is one of the basic chemical raw materials, it is directly related to the development of national economy. Soda ash production process, and NH3 gas medium mostly CO2, the liquid medium is mostly NaCl, higher NH4Cl, NH4HCO3 and Cl- concentration of the solution, the use of carbon steel, cast iron carry out the carbonation reaction of carbonation tower tubules, hot mother liquor cooler , coolers, and other main external cooling crystallization equipment, are intolerant of corrosion, corrosion serious leakage, life is not more than three years. 1975-1977, Tianjin Soda Plant and Dalian Chemical Industry Company conducted a titanium plant demonstration work, carbonation cooling tower 63 × 2mm, flat titanium heat exchanger, titanium cold outside, titanium pump, CO2 turbine compressor rotor , Ti-6Al-4V alloy impeller application works well, which is performed using titanium transformation and three new 600,000 tons of soda ash plant played a role model for the entire industry.

For example: a soda ash plant distillation column at the top of the application of titanium tube condenser ammonia instead of cast iron pipe. Ammonia condenser is a soda production process, the ammonia distilled off the distillation column is condensed in equipment, which consists of two cast-iron cooling box, each box of diameter 2.5m, high 1.2m, the original box there Φ63 × 6 × 2986mm cast small tube 214, a total of 428 two boxes. Both inside and outside the tube with a thermosetting novolak corrosion, tube media about NH3, CO2, H2O vapor, temperature 95 ℃. Go inside the tube NH4Cl liquor, media and tube heat exchangers. Under this condition, severe corrosion of cast iron pipe, use a year that is part of the pipe corrosion perforation, two years corroded badly damaged, stop using it. To solve the cast iron pipe ammonia condensers serious corrosion problems, will replace all cast iron pipe for TA2 titanium tubes, specifications for Φ60 × 2 × 3010mm, between titanium and cast iron pipe end sealed with O-type flower plate rubber ring. This is China's soda ash industry's first distillation column is cooled using a small tube titanium tube. Put into use more than two years, he butted Macroscopic examination found no corrosion, expected useful life up to 20 years, 10 times longer than the cast iron pipe. Because titanium tube corrosion resistance, good heat transfer efficiency (cast iron pipe during an overhaul in three years, the heat transfer efficiency is good early, mid-poor, late on the failure), NH4Cl liquor preheat tube heat recovery, increase liquor into the distillation column temperature, can save a lot of steam, the obvious economic benefits.