PROCESS FOR PRODUCING (METH)ACRYLIC ACID OR (METH)ACROLEIN

WIPO Patent Application WO/2005/100293

A1

A process for producing (meth)acrolein or (meth)acrylic acid, comprising carrying out vapor-phase catalytic oxidation reaction of propylene, propane, isobutylene or (meth)acrolein with the use of molecular oxygen or gas containing molecular oxygen in the presence of a composite oxide catalyst by means of a multitubular reactor having multiple reaction tubes loaded with the catalyst, so that (meth)acrolein or (meth)acrylic acid can be obtained with high yield stably for a prolonged period of time without local (unevenly distributed) extreme lowering of catalytic activity. There is provided a process wherein at an initial stage of operation the difference between the temperature of heat medium and the peak temperature of catalyst is set for 20 to 80°C and wherein during the operation any change of peak temperature (T) of catalyst in the direction of tube axis is regulated so as to fall within a given range.

OGAWA YASUSHI (JP)
YADA SHUHEI (JP)
SUZUKI YOSHIRO (JP)
TAKASAKI KENJI (JP)
JINNO KIMIKATSU (JP)

PCT/JP2004/016292

October 27, 2005

October 27, 2004

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MITSUBISHI CHEM CORP (JP)
OGAWA YASUSHI (JP)
YADA SHUHEI (JP)
SUZUKI YOSHIRO (JP)
TAKASAKI KENJI (JP)
JINNO KIMIKATSU (JP)

C07B61/00; C07C27/14; C07C45/35; C07C47/22; C07C51/215; C07C51/235; C07C51/25; C07C57/05; C07C57/055; (IPC1-7): C07C45/35; C07C27/14; C07C47/22; C07C51/235; C07C57/05; C07C57/055

WO2001042184A1	2001-06-14
WO2003055835A1	2003-07-10

JPS5421966A	1979-02-19
JPH0892147A	1996-04-09
JP2000053610A	2000-02-22
JP2004083430A	2004-03-18

Oguri, Shohei (7-13 Nishi-Shimbashi 1-chom, Minato-ku Tokyo 03, JP)

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