Process for producing (meth)acrolein and/or (meth)acrylic acid

Details Process for producing (meth)acrolein and/or (meth)acrylic acid Process for producing (meth)acrolein and/or (meth)acrylic acid

2007-05-15

2007-05-15

Barts, Samuel A (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C562S537000, C568S477000

Reexamination Certificate

active

10479228

ABSTRACT:
A method for producing (meth)acrolein and/or (meth)acrylic acid by subjecting isobutylene and the like or propylene to a vapor-phase catalytic oxidation with molecular oxygen in the presence of a solid oxidation catalyst in a tubular type of fixed bed reactor, wherein a temperature of a hot-spot zone is sufficiently controlled and (meth)acrolein and (meth)acrylic acid are produced with a high yield.A method for producing (meth)acrolein and/or (meth)acrylic acid by passing a raw material gas comprising isobutylene and the like or propylene and oxygen through a catalyst layer in a tubular type of fixed bed reactor which is filled with a solid oxidation catalyst, which includes passing a gas containing isobutylene and the like or propylene in a concentration lower than that of the raw material gas, and oxygen through the catalyst layer for a period of one hour or more prior to passing the raw material gas through the catalyst layer.

REFERENCES:
patent: 5276178 (1994-01-01), Onodera et al.
patent: 6346646 (2002-02-01), Watanabe et al.
patent: 987057 (2000-03-01), None
patent: 1055662 (2000-11-01), None
patent: 2001-55355 (2001-02-01), None
U.S. Appl. No. 10/479,228, filed Dec. 1, 2003, Watanabe et al.

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