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  Trans-1, 2-dichloroethylene is a kind of next generation chlorinated solvent which can be widely used in precision electronic instrument cleaning. Compared with traditional chlorinated and brominated solvents, trans-1, 2-dichloroethylene is safe for human health and more friendly to environmental characteristics. At present, the production methods of trans-1, 2-dichloroethylene in the market are mainly as follows: (1) Trans-1, 2-dichloroethylene May be obtained by dechlorination of 1, 1, 2, 2-tetrachloroethane by zinc powder or iron powder, or by cracking of 1, 1, 2-trichloroethane by copper chloride on pumice stone. However, no industrial production has been reported for either method. (2) US patents us20070191653 and us7335806 and world patent wo2007094965 have reported the preparation of trans 1, 2-dichloroethane. The patent is the reaction of 1, 2-dichloroethane with chlorine gas under the action of oxychlorination catalyst to obtain 1, 2-trichloroethane, 1, 2-trichloroethane...

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  Four-row cylindrical roller bearings   are essential components for steel rolling mills, as they must withstand heavy loads and operate reliably under harsh conditions. This unique design (four rows of rollers) ensures high load-carrying capacity and improved rigidity, making it an ideal choice for steel rolling mills. Among the bearing models,  bearing 313822  (280mm*390mm*220mm) is widely used in the steel mills. One of the key benefits of the 313822 bearing for steel rolling mills is its ability to handle high speeds. Rolling mills operate at high speeds, and bearing 313822 is designed to handle high speeds without sacrificing performance or reliability. The lubrication system of the bearing will ensure proper lubrication of the rollers and raceways, even at high speeds. Bearing 313822 is also featured with heavy carrying loads. Steel rolling mills require bearings that can handle heavy loads, while the four-row design of the bearing distributes the load evenly ...