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Your location：Acetic acid production hardware depends on what
Acetic acid plant, corrosion-resistant requirements, to use some special materials. It can be said that the development of acetic acid production technology depends largely on the development of special anti-corrosion materials. Reporters recently learned from the two major domestic and foreign specialty metals manufacturers, the production of special anti-corrosion materials for acetic equipment and production technology has a lot of new developments.
The reporter interviewed the quarter, the Red Army learned of the Titanium Group equipment manufacturing company vice president, acetic equipment specialty materials, the most expensive to the number of zirconium. Acetic acid plant, an annual output of 200,000 tons of oxo synthesis required 120 tons of zirconium, the $ 60,000 price of a ton of zirconium alone costs more than 700 million U.S. dollars. In the past, domestic zirconium production and processing technology development late, so had dragged on for domestic carbonyl acetate synthesis technology development progress for nearly 20 years hind legs. Domestic and some acetate companies have to travel across the ocean, zirconium and manufacture a set of zirconium equipment purchased in the United States, then shipped back to China. But also braved the play and foreign companies infringement lawsuits, equipment seizure duration of the risk of delay. Today, the domestic zirconium production and processing technologies has been rapid development, which is accompanied by the development of China's national defense industry and developed, for various reasons, less publicity in this regard. You can now say, domestic zirconium production and processing capacity in addition to meet the needs of China's national defense industry and nuclear industry, more and more production such as acetate, equipment, and other civil zirconium products.
China has not yet design and manufacture of zirconium and zirconium alloy container specification, non-nuclear zirconium material only corporate standards. The manufacture of zirconium has its own characteristics, not simply apply the data of other non-ferrous materials, design specifications, but should be improved according to their characteristics. Quarter of the Red Army the successful experience of the Titanium Group production of zirconium equipment. Zirconium tensile strength with increasing temperature significantly reduced, commercially pure zirconium should not be used as a temperature higher than 350 ℃ or more chemical equipment. Zirconium hydrogen absorption hydrogen embrittlement above 300 ℃ and 400 ℃ above reaction with nitrogen, oxygen, zirconium welding bath and cooling of the weld must be strictly under the protection of inert gas. Zirconium and other metals can not be welded, which is due to the zirconium melting point 1855 ° C, higher than many metals, and prone to the formation of brittle intermetallic compound, causing the weld embrittlement. Zirconium and other metal connection, only brazing, bonding, explosive welding, and bolt connection. Zirconium elastic modulus is only half of the steel, zirconium equipment section size than steel, zirconium tube heat exchanger baffle spacing much smaller than the steel than titanium is also slightly smaller. Small coefficient of thermal expansion of zirconium, to consider the stress of thermal expansion and other metal combination devices.
The reporter interviewed the manager learned of the American Metallurgical Science and Technology Beijing, Zhu wind, most recently, the U.S. rule of Science and Technology has launched a new low-cost corrosion-resistant materials - super austenitic stainless steel (AL-6XN), the market selling price per ton about $ 20,000, only one-third of zirconium is about 40% of the Hastelloy. The material is characterized by added nitrogen to stabilize the austenitic structure in the metallographic, and reduce the harmful intermediate phase formation, improved corrosion resistance, especially resistance to chloride pitting, crevice corrosion and stress corrosion ability to improve. Domestic an Institute for the introduction of the materials, manufacturing technology, used in the manufacture of the reactor in the AC blowing agent production equipment. The high concentration of chloride ion in the sulfuric acid before the reactor has spent much of the material can not, with the AL-6XN to solve this problem, one o'clock corrosion did not occur. Yangtze Acetyl 2 acetic acid recovery tower is the manufacture of titanium, the service life of only 3 to 5 years and made a two-year coupon test in which, with the AL-6XN, a little corrosion no. Acetate finished tower of the domestic enterprises are now mostly made with 316R stainless steel, only five years of life, made with AL-6XN, estimated life of 30 years based on test results. This is a suitable new materials for the manufacture of acetic acid equipment.
Cerium Zirconlum Catalysts,Cerium Zirconlum Mixed Oxide
