| US 7,388,107 B2 | ||
| Process for producing (meth)acrylic acid or (meth)acrolein | ||
| Kimikatsu Jinno, Mie (Japan); Yasushi Ogawa, Mie (Japan); Yoshiro Suzuki, Mie (Japan); and Shuhei Yada, Mie (Japan) | ||
| Assigned to Mitsubishi Chemical Corporation, Tokyo (Japan) | ||
| Appl. No. 11/587,990 PCT Filed Oct. 20, 2004, PCT No. PCT/JP2004/015873 § 371(c)(1), (2), (4) Date Aug. 01, 2007, PCT Pub. No. WO2005/105714, PCT Pub. Date Nov. 10, 2005. |
||
| Claims priority of application No. 2004-135311 (JP), filed on Apr. 30, 2004. | ||
| Prior Publication US 2007/0270610 A1, Nov. 22, 2007 | ||
| Int. Cl. C07C 51/16 (2006.01); C07C 45/00 (2006.01) | ||
| U.S. Cl. 562—545 [568/479] | 18 Claims |
| 1. A method for producing (meth)acrylic acid or (meth)acrolein, comprising:
(a) supplying propylene, propane, or isobutylene and a first gas comprising molecular oxygen to a reactor which contains a
catalyst, to effect catalytic gas phase oxidation of said propylene, propane, or isobutylene, to obtain (meth)acrylic acid
or (meth)acrolein; and
(b) shutting down said reactor by reducing said supplying of said propylene, propane, or isobutylene;
wherein a second gas comprising molecular oxygen is supplied to said reactor during said shutting down of said reactor, to
maintain said catalyst in an oxidized state.
|