Dual catalyst bed reactor for methanol oxidation

Details Dual catalyst bed reactor for methanol oxidation Dual catalyst bed reactor for methanol oxidation

2005-04-05

2005-04-05

Johnson, Christina (Department: 1725)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S305000, C502S321000, C502S353000, C502S350000, C422S186220, C422S211000

Reexamination Certificate

active

06875724

ABSTRACT:
A process and apparatus for oxidizing methanol in a gas stream into formaldehyde in a fixed bed reactor. The process first introduces a gas stream into a fixed bed reactor. The fixed bed reactor contains a catalyst bed having a depth, a width, a length, an inlet, an upstream region, a downstream region and an outlet. Preferably, the inlet, the upstream region, the downstream region and the outlet are provided in the order stated. A vanadia-titania catalyst is provided in the upstream region and a molybdena-titania catalyst is provided in the downstream region. The vanadia-titania catalyst in the upstream region is substantially free of MoO3and initially (i.e., during oxidation some V2O5may sublime and migrate to the downstream region) the molybdena-titania catalyst in the downstream region is substantially free of V2O5. Next, the gas stream is contacted with the vanadia-titania catalyst under oxidizing conditions. Then, the gas stream is contacted with a molybdena-titania catalyst under oxidizing conditions which provides a product stream containing formaldehyde at the desired conversion and formaldehyde selectivity.

REFERENCES:
patent: 2065394 (1936-12-01), Punnett
patent: 3978136 (1976-08-01), Friedrich et al.
patent: 4343954 (1982-08-01), Hoene
patent: 4421938 (1983-12-01), Windawi
patent: 5118868 (1992-06-01), Sarup et al.
patent: 5217936 (1993-06-01), Sarup et al.
patent: 6245708 (2001-06-01), Wachs et al.
patent: 6559345 (2003-05-01), Wachs
patent: 20030171624 (2003-09-01), Wachs et al.
patent: 0 199 359 (1986-10-01), None
patent: 1 463 174 (1977-02-01), None
patent: WO 9823360 (1998-06-01), None
patent: WO 9952629 (1999-10-01), None
patent: WO 9952630 (1999-10-01), None
EPO International Search Report from related application PCT/US 01/28341, dated Jun. 3, 2002.
EPO International Search Report from related application PCT/US 01/28353, dated Jun. 7, 2002.
Jehng et al.Applied Catalysis A, 83, 179-200 (1992).
Jehng and Wachs,Catalysis Today, 16, 417-426, (1993).
Kim and Wachs,Journal Catalysis, 141, 419-429, (1993).
Deo et al.Journal Catalysis, 146, 335-345, (1994).
Jehng et al.J. Chem. Soc. Faraday Trans, 91(5), 953-961, (1995).
Kim et al.Journal of Catalysis, 146, 268-277, (1994).
Banares et al.,Journal of Catalysis, 150, 407-420, (1994).
Jehng and Wachs,Catalyst Letters, 13, 9-20, (1992).
G. Deo and I. Wachs,Journal of Catalysis, 146, 323-334 (1994).
G. Deo and I. WachsJournal of Catalysis146, 335-345 (1994).

Affiliated with

Also associated with

Rating

Dual catalyst bed reactor for methanol oxidation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual catalyst bed reactor for methanol oxidation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual catalyst bed reactor for methanol oxidation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3404328