PTA, also known as purified terephthalic acid, is the most widely used basic chemical raw material. Mainly used in the production of polyester products. The use of polyester can be divided into two categories: "fiber" and "non-fiber". Fibers are mainly used in the textile industry, and non-fibers are mainly used in industries such as films, containers, insulating materials, and engineering plastics. It can be said that they are very versatile. my country is the world's largest producer and consumer of PTA, accounting for about 56% of the world's total. In the case of very serious foreign epidemics, my country's dependence on foreign PTA has been further reduced in recent years. This has also prompted a fire in the domestic PTA industry, and the use of titanium materials and titanium equipment has grown rapidly.
Due to the corrosive environment of PTA devices and the excellent corrosion resistance of titanium alloys, titanium alloys have become the preferred material for PTA devices. It can resist corrosion in various corrosive environments of PTA devices. In the PTA device, titanium is mainly used in the form of protection: titanium-lined and all-titanium equipment. The titanium-lined equipment is made of carbon steel on the outside to bear the medium pressure, and the titanium lining is used to resist the corrosion of the medium. The all-titanium parts are entirely made of titanium to bear the corrosion and pressure of the medium. The parts where titanium materials are used in PTA mainly include three parts: an oxidation unit, crystallization unit, and solvent recovery unit. The most serious corrosion environment in the oxidation unit is the oxidation reactor and the top 3-stage condenser. Therefore, all the equipment in contact with the process medium here are made of titanium. The most corrosive environment of the crystallization unit is the crystallizer and the top condenser. The equipment in this place is made of titanium alloy materials that meet the performance. The tubes and trays in the reboiler of the dehydration tower above 120 degrees in the solvent recovery unit are all made of titanium alloy materials of relevant grades.
It can be seen that titanium has many uses in PTA equipment, and the amount is very large. Therefore, when the domestic epidemic situation was severe in the past two years, the titanium industry still maintained a rapid development momentum, which is inseparable from the rapid development of the domestic PTA industry.
