| 摘要 |
In the case where a carbon steel shell and tube type reactor is used and, for example, ethylene is subjected to catalytic gaseous oxidation to manufacture ethylene oxide, if rust is formed on the internal surface of the tubes, impurities such as aldehydes are formed. The cause of formation of the rust is that when the catalyst in the reactor is exchanged, dew is formed on the internal surface of the tubes. The present invention provides, as a method for preventing the rust formation, a method which comprises, in conducting the catalyst exchange work, maintaining the temperature of the internal surface of the tubes higher than the dew point at the work atmosphere (for example, filling the shell side with water and maintaining the temperature of the water higher than the temperature of the atmosphere).
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