Method for producing unsaturated aldehyde

Patent metadata

Field	Value
Publication number	US-2022169587-A1
Application number	US-202017437250-A
Country	US
Kind code	A1
Filing date	Mar 17, 2020
Priority date	Mar 29, 2019
Publication date	Jun 2, 2022
Grant date	—

Abstract

Provided is a method for producing an unsaturated aldehyde including subjecting an alkene to partial oxidation using a fixed bed multi-tube reactor to produce the corresponding unsaturated aldehyde, in which n catalyst layers (n is 2 or more) in a gas flow direction in a reaction tube are provided, when a filling length of the catalyst layers from a first catalyst layer to an (n-1)th catalyst layer from a gas inlet side of the reaction tube is L, and a filling length of an nth catalyst layer from the gas inlet side of the reaction tube is Ln, a relationship between L and Ln satisfies the following equation (1):1<L⁢/⁢Ln≤3,(1)anda composition of a catalytically active component contained in the catalyst layers from the first catalyst layer to the (n-1)th layer from the gas inlet side of the reaction tube is different from a composition of a catalytically active component contained in the nth catalyst layer from the gas inlet side of the reaction tube.

First claim

1 . A method for producing an unsaturated aldehyde comprising,
subjecting an alkene to partial oxidation using a fixed bed multi-tube reactor to produce the corresponding unsaturated aldehyde, wherein n catalyst layers (n is 2 or more) in a gas flow direction in a reaction tube is provided, when a filling length of the catalyst layers from a first catalyst layer to an (n-1)th catalyst layer from a gas inlet side of the reaction tube is L, and a filling length of an nth catalyst layer from the gas inlet side of the reaction tube is Ln, a relationship between L and Ln satisfies the following equation (1):

1
<

L
⁢

/

⁢
Ln

≤
3

,

(
1
)

and
a composition of a catalytically active component contained in the catalyst layers from the first catalyst layer to the (n-1)th layer from the gas inlet side of the reaction tube is different from a composition of a catalytically active component contained in the nth catalyst layer from the gas inlet side of the reaction tube.

2 . The method for producing an unsaturated aldehyde according to claim 1 , wherein the relationship between L and Ln satisfies the following equation (2):

1
⁢
.1

<

L
⁢

/

⁢
Ln

≤

1.4
.

(
2
)

3 . The method for producing an unsaturated aldehyde according to claim 1 , wherein a catalyst contained in the catalyst layer has a spherical shape.

4 . The method for producing an unsaturated aldehyde according to claim 1 , wherein a concentration of the alkene in a raw material is 6 vol % to 12 vol %.

5 . The method for producing an unsaturated aldehyde according to claim 1 , wherein each catalyst layer in the reaction tube contains a catalyst containing a catalytically active component having a composition represented by the following formula (3):
Mo 12 Bi a Fe b Co c Ni d X e Y f Z g O h   (3)
where 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), arsenic (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 an atomic proportion of each component, h is a numerical value determined by a degree of oxidation of a catalyst component, a=0.40 to 2.0, b=1 to 3, c=3 to 7.5, d=2 to 4, e=0 to 10, f=0 to 10, g =0.01 to 0.50, h is a numerical value for satisfying oxidation states of the other elements, d/a is 1 or more and 9 or less, d/g is 5 or more and 350 or less, and a/g is 0.8 or more and 90 or less.

6 . The method for producing an unsaturated aldehyde according to claim 1 , wherein a catalyst contained in the nth catalyst layer is not diluted with an inert substance.

7 . The method for producing an unsaturated aldehyde according to claim 1 , wherein a catalyst contained in the catalyst layer is a carried catalyst.

Assignees

• Nippon Kayaku Kk

Inventors

• Kawamura Tomoyuki
• Hiraoka Ryota
• YASUDA Shogo

Classifications

• B01J35/51

  Spheres · CPC title

• B01J35/40

  characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title

• B01J37/04

  Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J37/0045

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

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title