Catalyst and process for the oxidative dehydrogenation of N-butenes to butadiene

Patent metadata

Field	Value
Publication number	US-9399606-B2
Application number	US-201314097375-A
Country	US
Kind code	B2
Filing date	Dec 5, 2013
Priority date	Dec 6, 2012
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

The invention relates to a catalyst which comprises a catalytically active multimetal oxide which comprises molybdenum and at least one further metal has the general formula (I)

Mo 12 Bi a Mn b Co c Fe d X 1 e X 2 f O x   (I),
where the variables have the following meanings: X 1 =Si and/or Al; X 2 =Li, Na, K, Cs and/or Rb; a=0.2 to 1; b=0 to 2; c=2 to 10; d=0.5 to 10; e=0 to 10; f=0 to 0.5; and x=is a number determined by the valence and abundance of the elements other than oxygen in (I).

First claim

The invention claimed is:

1. A catalyst which comprises a catalytically active multimetal oxide which comprises molybdenum and at least one further metal has the general formula (I)
Mo 12 Bi a Mn b Co c Fe d X 1 e X 2 f O x   (I),

where the variables have the following meanings:
X 1 =Si and/or Al;
X 2 =Li, Na, K, Cs and/or Rb;
a=0.2 to 1;
b≧0 to 2;
c=2 to 10;
d=0.5 to 10;
e=0 to 10;
f=0 to 0.5; and
x=is a number determined by the valence and abundance of the elements other than oxygen in (I).

2. The catalyst according to claim 1 , wherein X 1 formula (I) is silicon.

3. The catalyst according to claim 1 , wherein X 2 in formula (I) is potassium.

4. The catalyst according to claim 1 , wherein, in formula (I),
a=0.5 to 4;
b=0.1 to 0.8;
c=5 to 9;
d=2 to 6;
e=1 to 1.0; and
f=0.01 to 0.3.

5. The catalyst according to claim 1 , which is an all-active catalyst.

6. The catalyst according to claim 1 , which is a coated catalyst comprising a support body (a) and a shell (b).

7. The catalyst according to claim 6 , wherein the support body is a hollow cylinder having a length of from 2 to 6 mm, an external diameter of from 4 to 8 mm, and a wall thickness of from 1 to 2 mm.

8. The catalyst according to claim 6 , wherein the support body is composed of steatite.

9. The catalyst according to claim 6 , wherein the shell (b) has a layer thickness D of from 50 to 600 μm.

10. A process for the oxidative dehydrogenation of n-butenes to butadiene, wherein a starting gas mixture comprising n-butenes is mixed with an oxygen-comprising gas and brought into contact with a coated catalyst according of claim 1 arranged in a fixed catalyst bed at a temperature of from 220 to 490° C. in a fixed-bed reactor.

11. The process according to claim 10 , wherein the fixed-bed reactor is a fixed-bed tube reactor or fixed-bed shell-and-tube reactor.

12. The process according to claim 10 , wherein the starting gas mixture comprising n-butenes is obtained by nonoxidative dehydrogenation of n-butane.

13. The process according to claim 10 , wherein the starting gas mixture comprising n-butenes is obtained from the C 4 fraction from a naphtha cracker by dimerization of ethylene.

14. The process according to claim 10 , wherein the starting gas mixture comprising n-butenes is obtained by fluid catalytic cracking (FCC).

Assignees

• Basf Se

Inventors

• Rüttinger Wolfgang
• Walsdorff Christian
• Grüne Philipp

Classifications

• B01J23/8898

  containing also molybdenum · CPC title

• C07C2523/28

  Molybdenum · CPC title

• C07C2523/75

  Cobalt · CPC title

• C10G2300/1092

  C2-C4 olefins · CPC title

• C07C2523/34

  Manganese · CPC title