Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2007-09-04
2007-09-04
Witherspoon, Sikarl A. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C562S547000
Reexamination Certificate
active
11021442
ABSTRACT:
Disclosed is a method for producing unsaturated aldehydes or unsaturated fatty acids from at least one compound selected from the group consisting of propylene, propane, (meth)acrolein, isobutylene, t-butyl alcohol, methyl-t-butyl ether and o-xylene by means of fixed-bed catalytic partial oxidation in a shell-and-tube reactor, characterized in that the reactor includes a reaction zone for producing unsaturated aldehydes as a main product, the reaction zone having an inactive material layer inserted into a position where a hot spot is to be generated in a reaction tube. A fixed-bed shell-and-tube reactor for use in the above method is also disclosed. According to the present invention, at least one layer of inactive material is packed at the point of a hot spot to control the hot spot temperature efficiently, thereby increasing the lifetime of a catalyst and producing unsaturated aldehydes and unsaturated fatty acids with high yield.
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PCT International Search Report for Application No. PCT/KR2004/003433; International filing date: Dec. 24, 2004; Date of Mailing : Mar. 21, 2005.
Cho Young Jin
Choi Byung Yul
Choi Young Hyun
Kim Duk Ki
Park Joo Yeon
Cantor & Colburn LLP
LG Chem Ltd.
Witherspoon Sikarl A.
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