| 摘要 |
PROBLEM TO BE SOLVED: To perform the operation and shutdown of a catalyst-filled reaction pipe with high frequency, without destroying granular catalysts filled in the reaction pipe. SOLUTION: A one-through reaction pipe 10 has a double-pipe structure and the inside of a reaction pipe 11 is not completely filled with the catalysts 12. A notched inner pipe 13 has a notched part in the whole circumference, and the width of the notched part is changed according to the temperature fluctuation due to the operation and the shutdown, thereby absorbing force applied to the catalyst 12 to prevent them from being destroyed. The notched part is sealed with a seal plate 14 to prevent a raw material gas 18 from entering into the inside of the notched inner pipe from the notched part.
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