| US 7,563,927 B2 | ||
| Process for producing (meth)acrylic acid or (meth)acrolein | ||
| Yasushi Ogawa, Mie (Japan); Shuhei Yada, Mie (Japan); Yoshiro Suzuki, Mie (Japan); Kenji Takasaki, Mie (Japan); and Kimikatsu Jinno, Mie (Japan) | ||
| Assigned to Mitsubishi Chemical Corporation, Tokyo (Japan) | ||
| Appl. No. 11/547,004 PCT Filed Oct. 27, 2004, PCT No. PCT/JP2004/016292 § 371(c)(1), (2), (4) Date Dec. 19, 2006, PCT Pub. No. WO2005/100293, PCT Pub. Date Oct. 27, 2005. |
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| Claims priority of application No. 2004-108736 (JP), filed on Apr. 01, 2004. | ||
| Prior Publication US 2007/0208201 A1, Sep. 06, 2007 | ||
| Int. Cl. C07C 51/16 (2006.01) | ||
| U.S. Cl. 562—532 [562/534; 562/535] | 20 Claims |
| 2. In a method of producing (meth)acrylic acid comprising the gas phase catalytic oxidation of (meth)acrolein in the presence
of molecular oxygen or a gas containing molecular oxygen in a fixed bed multi-tubular reactor having a plurality of reaction
tubes, wherein the reaction tubes are filled with at least one catalyst and the reaction temperature is controlled by a heat
medium flowing outside of the reaction tubes, the improvement comprising:
(1) said at least one catalyst is a Mo—V-based composite oxide catalyst,
(2) at the beginning of the reaction process, the temperature difference between a temperature of the heat medium and a peak
temperature of the catalyst is set in the range of 20 to 80° C., and
(3) during the reaction process, a peak temperature T (° C.) of the catalyst in the tube axis direction of each reaction tube
satisfies Equation 1 below:
 where L is the length of a reaction tube, T0 is a peak temperature of a catalyst in a tube axis direction at the beginning of the reaction process, X is a length from
an entrance of a reaction tube up to a position that shows the peak temperature T, and X0 is a length from the entrance of the reaction tube up to a position that shows the peak temperature T0.
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