Method For Producing Unsaturated Aldehyde And/or Unsaturated Carboxylic Acid

Patent metadata

Field	Value
Publication number	US-2016145180-A1
Application number	US-201414903410-A
Country	US
Kind code	A1
Filing date	Jul 17, 2014
Priority date	Jul 18, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

Provided is a method of subjecting an alkene to partial oxidation by using a fixed bed multitubular reactor, thereby producing an unsaturated aldehyde and/or an unsaturated carboxylic acid each corresponding to the alkene, wherein a plurality of catalyst layers formed by N division (N is N≧2) with respect to a gas flow direction of a reaction tube are provided, and when a change (° C.) of hot spot temperature per 1° C. change of reaction bath temperature in the catalyst layer is designated as Sn, at least one of the plurality of catalyst layers is regulated to Sn≦6.

First claim

1 . A method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid, which is a method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid each corresponding to an alkene by partially oxidizing the alkene using a fixed bed multitubular reactor,
wherein a plurality of catalyst layers formed by N division (N is N≧2) with respect to a gas flow direction of a reaction tube are provided, and when a change (° C.) of hot spot temperature per 1° C. change of reaction bath temperature in the catalyst layer is designated as Sn, at least one of the plurality of catalyst layers is regulated to Sn≦6.

2 . The method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid according to claim 1 ,
wherein at least one of the plurality of catalyst layers is regulated to Sn≦3.

3 . The method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid according to claim 1 ,
wherein N is 2 or 3.

4 . The method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid according to claim 1 ,
wherein a concentration of the alkene in a raw material is 7 to 12% by volume.

5 . The method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid according to claim 1 ,
wherein all of the catalyst layers contain a complex metal oxide having a formulation represented by the following formula (1):
Mo 12 Bi a Fe b Co c Ni d X e Y f Z g O h   Formula (1)

X is at least one element selected from the group consisting of magnesium (Mg), calcium (Ca), manganese (Mn), copper (Cu), zinc (Zn), cerium (Ce) and samarium (Sm); Y is at least one element selected from the group consisting of boron (B), phosphorus (P), asthenic (As), antimony (Sb) and tungsten (W); Z is at least one element selected from the group consisting of sodium (Na), potassium (K), rubidium (Rb) and cesium (Cs); a to g represent atomic ratios of the respective components; h is a numerical value determined by degrees of oxidations of the catalyst components; a=0.80 to 2.0, b=1 to 3; c=3 to 7; d=2 to 4; e=0 to 10; f=0 to 10; g=0.01 to 0.10; h is expressed by the numerical value satisfying the oxidation states of other elements; d/a is 1.9 or more and 3.2 or less; d/g is 29 or more and 69 or less; and a/g is 18 or more and 39 or less.

6 . The method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid according to claim 5 , wherein b=1 to 2.5, d=2 to 3.5, and a/g is 18 or more and 35 or less.

Assignees

• Nippon Kayaku Kk

Inventors

• Kawamura Tomoyuki
• Kurakami Tatsuhiko
• NAKAZAWA Yuuta
• Kawaguchi Toru
• Sugiyama Motohiko

Classifications

• C07C45/27

  by oxidation (with ozone C07C45/40) · CPC title

• B01J23/002

  Mixed oxides other than spinels, e.g. perovskite · CPC title

• B01J37/0045

  Drying a slurry, e.g. spray drying · CPC title

• B01J23/8876

  Arsenic, antimony or bismuth · CPC title

• B01J37/031

  Precipitation · CPC title