With the development of industrial modernization, titanium has been widely used as a new metal material. Titanium and titanium alloy are irreplaceable metal structural materials in the development of the petroleum industry. In the petrochemical industry, generally, industrial pure titanium is mainly used to manufacture equipment with high corrosion resistance and high strength.
Titanium and titanium alloys commonly used in the petrochemical industry are mainly industrial pure titanium and low alloyed titanium, that is, TA0, TA1, TA2 and TA9(Ti PD), TA10 (Ti Mo Ni) specified in national standards.
Application of titanium in the petroleum industry
1. Titanium alloy oil casing pipe
Most of China's natural gas resources are sour gas fields. The development of highly corrosive oil and gas fields has become a major problem faced by the oil and gas industry.
2. Titanium alloy transmission pipeline
Because the titanium alloy pipe is easy to bend and has high resistance to dynamic stress corrosion fatigue caused by wave impact and platform movement, The stress corrosion fatigue resistance of titanium alloy pipe is more than 10 times higher than that of existing carbon steel, When laying the sea pipe at the same time, the titanium alloy pipe is suitable for the bending deformation condition in the laying process. The Titanium alloy transmission pipeline has good welding performance, single-sided welding, and double-sided forming technology to ensure uniform and reliable welds, and the mechanical performance of the titanium alloy transmission pipeline is excellent.
3. Terephthalic acid equipment
Terephthalic acid is an important raw material of synthetic polyester fiber, which is mainly produced by p-xylene oxidation. In industry, there are 2 processes: the low-temperature oxidation method and the high-temperature oxidation method. Due to the presence of an acetic acid solvent, catalyst, and cocatalyst bromide of cobalt acetate or manganese acetate, serious pitting corrosion will occur in stainless steel equipment when the temperature is higher than 135 ℃.
Shanghai Petrochemical General plant has introduced Japanese units into the low-temperature oxidation production line. Its high-temperature washing tank, high-temperature washing tank condenser, and high-temperature heater are titanium equipment, which has achieved good operating results.
4. Adipic acid production equipment
Adipic acid is the main chemical raw material for the production of nylon-66 salt. The main corrosive media in the production of adipic acid are nitric acid, scaly acid, and adipic acid. The equipment made of low-carbon stainless steel is seriously corroded, especially several important types of equipment of the adipic acid plant, which are more seriously corroded and frequently overhauled, affecting the output of adipic acid, After the key equipment nitric acid distillation tower bottom reboiler and nitric acid secondary evaporator are made of industrial pure titanium and titanium steel composite plate, The operation is stable, there is no obvious corrosion on the material surface, and the cutting tool marks on the tube sheet are still clearly visible, so the corrosion problem is fundamentally solved.
Titanium and titanium alloy are ideal metal structural materials for anti-corrosion in petrochemical equipment. They are essential anti-corrosion materials for solving equipment corrosion or controlling its corrosion. They play an important role in ensuring long-term safe operation of equipment, improving production efficiency, reducing production costs,s and environmental protection.
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