| US 7,549,341 B2 | ||
| Method of maintaining a multitubular reactor | ||
| Yasushi Ogawa, Yokkaichi (Japan); Shuhei Yada, Yokkaichi (Japan); Yoshiro Suzuki, Yokkaichi (Japan); Kenji Takasaki, Yokkaichi (Japan); and Kimikatsu Jinno, Yokkaichi (Japan) | ||
| Assigned to Mitsubishi Chemical Corporation, Tokyo (Japan) | ||
| Appl. No. 11/597,939 PCT Filed Oct. 25, 2004, PCT No. PCT/JP2004/016173 § 371(c)(1), (2), (4) Date Jan. 30, 2007, PCT Pub. No. WO2005/115605, PCT Pub. Date Dec. 08, 2005. |
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| Claims priority of application No. 2004-161314 (JP), filed on May 31, 2004. | ||
| Prior Publication US 2008/0271539 A1, Nov. 06, 2008 | ||
| Int. Cl. G01L 13/00 (2006.01) | ||
| U.S. Cl. 73—716 [73/736] | 10 Claims |
| 1. A method of maintaining a multi-tubular reactor packed with a catalyst, characterized by:
(1) selecting arbitrarily reaction tubes amounting to at least 20% of the reaction tubes in the multi-tubular reactor;
(2) passing gas into each of the selected reaction tubes to measure a differential pressure occurring in each reaction tube;
(3) comparing the differential pressure at (2) above with the average of differential pressures occurring in reaction tubes
packed with an fresh catalyst of the same kind when passing the same kind of gas as at (2) above at the same flow rate (average
initial differential pressure) to separate any reaction tube showing an abnormal differential pressure; and
(4) giving adequate treatment to the separated reaction tube.
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