Lg Chem, Ltd

Joo Yeon Park

Hyun Jong Shin

Byung Yul Choi

Duk Ki Kim

Yeon Shick Yoo

Young Jin Cho

Kwang Ho Park

Young Hyun Choi

Young Hyun Choe

Disclosed is a shell-and-tube reactor that may be used for fixed-bed catalytic partial oxidation, the reactor being characterized by including at least one reaction zone of a first-step reaction zone for mainly producing unsaturated aldehydes and a second-step reaction zone for mainly producing unsaturated acids, wherein at least one reaction zone of the above reaction zones comprises two or more catalytic layers; each of the catalytic layers is packed with a formed product of catalyst that is different in pore density and/or pore size in a catalytically active component; and the pore density and/or pore size is controlled in such a manner that specific surface area of the catalytically active component increases from the inlet of the reactor to the outlet of the reactor. A method for producing unsaturated aldehydes and/or unsaturated fatty acids from olefins using the same reactor is also disclosed. According to the present invention, it is possible to control the temperature efficiently at a hot spot, thereby permitting stable use of a catalyst, and to produce unsaturated aldehydes and/or unsaturated fatty acids with high yield.

Method of producing unsaturated aldehyde and/or unsaturated acid

Disclosed are a Mo&#x2014;Bi&#x2014;Nb&#x2014;Te based composite metal oxide; and a process for producing (meth)acrylic acid from at least one reaction material selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, wherein the Mo&#x2014;Bi&#x2014;Nb&#x2014;Te based composite metal oxide is used as a catalyst. Also, disclosed is a process for producing (meth)acrylic acid comprising a first step of producing (meth)acrolein as a main product from at least one reaction material selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, and a second step of producing (meth)acrylic acid from the (meth)acrolein, wherein yield of (meth)acrylic acid in the product of the first step is 20 mole % or higher.

Complex metal oxide catalyst with high (meth) acrylic acid selectivity

Disclosed is a method for producing unsaturated fatty acids from unsaturated aldehydes 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 fatty acids, 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 fatty acids with high yield.

Method for producing unsaturated fatty acids

Disclosed is a shell-and-tube reactor that may be used in a method for producing unsaturated aldehydes and/or unsaturated acids from olefins by means of fixed-bed catalytic partial oxidation. The reactor includes at least one reaction zone of a first-step reaction zone for producing unsaturated aldehydes as a main product and a second-step reaction zone for producing unsaturated acids as a main product, and at least one reaction zone of the reaction zones comprises two or more catalytic layers, each of the catalytic layers being packed with a formed product of catalyst as secondary particles, wherein the secondary particles in each catalytic layer are formed of primary particles of a catalytically active component having a different particle size, and the particle size of primary particles of the catalytically active component is controlled so that it decreases from an inlet of the reactor to an outlet of the reactor. A method for producing unsaturated aldehydes and/or unsaturated fatty acids from olefins using the same reactor is also disclosed. According to the present invention, it is possible to control the temperature efficiently at a hot spot, thereby permitting a catalyst to be used stably, and to produce unsaturated aldehydes and/or unsaturated fatty acids with high yield.

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.

Growing community of inventors

Naju-si, South Korea

Joo Yeon Park