Gr2 Titanium Equipment - Titanium Heat Exchangers Titanium Coils in the Petrochemical Field Applications

The most commonly used titanium materials are industrially pure titanium, TA2 (American Standard Grade Gr2), which is the most widely used, Ti-6Al-4V (when a certain level of strength is required), and Ti-0.8Ni-0.3Mo (when there is a gap or in a non-oxidizing medium). When hydrogen absorption and hydrogen embrittlement may occur, especially in the case of corrosion and hydrogen absorption in the weld zone, it is necessary to use titanium materials with low iron (<o.05%). Titanium equipment - titanium heat exchangers, condensers and related auxiliary equipment have been successfully used in petrochemical enterprises for more than 20 years.

Examples of titanium equipment used in the chemical industry:

 
Terephthalic acid is the raw material for the synthesis of polyester, which is industrially obtained by p-xylene oxidation method. Whether high-temperature oxidation or low-temperature oxidation there are high-temperature corrosion of acetic acid and bromide, at temperatures higher than 135 ℃ in the medium, 316L stainless steel pitting occurs after several dozen hours. Therefore, the design specification must be used above 135 ℃ titanium. 
In the ethylene oxidation into acetaldehyde, acetaldehyde oxidation into acetic acid and propylene oxidation synthesis of acetone device, in addition to raw materials and products have a certain degree of corrosivity, the main corrosive medium is the catalyst, stainless steel corrosion is very fast in which the only titanium has good corrosion resistance. As early as 1963, the United States in the production of ethylene oxidation of acetaldehyde production in the application of titanium has been successful. China's first set of ethylene oxidation of acetaldehyde device has been put into use in 1976, so far the operation of titanium equipment in good condition. Foreign titanium-lined reactor up to 9.6m, 3m in diameter, as well as heat exchangers, catalyst regeneration tower, acetaldehyde solution cooler and other 11 titanium equipment.

Examples of titanium equipment used in the petroleum industry:

 
Urea is a high-quality fertilizer and a raw material for petrochemicals. Since 1963, the first titanium lined urea synthesis tower production, there are nearly 10,000 units of equipment in the world operation, practice shows that the titanium lined synthetic tower without significant corrosion. And 316L stainless steel corrosion rate of 4.1-4.5mm / a. Therefore, titanium than stainless steel has better economic benefits. In addition to titanium lined urea synthesis tower, the domestic from the 1970s, has used the C02 vapor tower, heat exchanger, mixer and pumps and valves.
• In the refining of crude oil with high sulfur and salt content, titanium equipment is more ideal. Foreign countries in the atmospheric distillation unit, sewage treatment equipment, desulfurization separation tower condenser and the radiator of the stripping tower and many other processes have been successfully selected titanium equipment for many years. China has also been used in the system of cast titanium seawater pumps, catalytic cracking fractionation in the titanium condenser, deep cold separation of titanium condenser and porous titanium plate, etc., have been operating normally for more than ten years.
• Chlorinated hydrocarbons are one of the largest varieties of petrochemicals. Because of the chlorination reaction involved, stainless steel equipment has been difficult to handle. Foreign countries have used titanium to manufacture dichloromethane distillation tower, trichloroethane heat exchanger, condensation tower and fractionation tower, trichloroethylene condensation tower, perchloroethylene heat exchanger and multichloride coil heater, etc.. China's vinyl chloride production, cooling towers, wastewater vaporization tower and wastewater storage tanks tower plate support frame, take over, flange sealing surface, the use of Ti-0.2Pd lining, has been used for nearly a decade without corrosion. And titanium piping, joints and gas distributors have been using titanium for many years.
• Phenol is an important raw material for petrochemical industry, and it is a new process to get phenol and acetone from isopropylbenzene and peroxyisopropylbenzene by using propylene and benzene in refinery gas as raw materials. Overseas in more than ten years ago on the use of titanium equipment, China's process is still under development. The old process with benzene sulfonated alkali solution production of phenol, China has used titanium neutralization reactor, titanium coil cooler and ionic titanium nitride stirrer bushing, titanium target, the effect is very good.
Titanium evaporator
• acetaldehyde oxidation system acetic acid is a common process in China, has been used titanium as a high-boiling reboiler, a first-class acetic acid tower reboiler and condensation cooler and a variety of equipment. Foreign countries in the distillation tower, fractional distillation tower and distillation tower, etc. have adopted titanium equipment. Especially in the oxidation of low-grade alkanes to acetic acid by-products, formic acid content of 8%, corrosive, this time with titanium instead of stainless steel, the effect is very satisfactory.