Process for the production of unsaturated acids

Patent 4260822 Issued on April 7, 1981. Estimated Expiration Date:

October 30, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3293290

Catalytic conversion of saturated hydrocarbons to unsaturated products by oxidation in the presence of a halogen
Patent #: 4010188
Issued on: 03/01/1977
Inventor: Grasselli , et al.

Catalytic oxidation Patent #: 4066704
Issued on: 01/03/1978
Inventor: Harris, et al.

Inventors

Assignee

Rohm and Haas Company

Application

No. 05/956011 filed on 10/30/1978

US Classes:

562/549, Alkane502/211, Molybdenum562/535, Group V metal containing catalyst utilized568/399, Oxidation of organic compound utilizing gaseous oxygen568/475Acyclic hydrocarbon reactant

Examiners

Primary: Garner, Vivian

Attorney, Agent or Firm

International Classes

C07C 51/215 (20060101)
C07C 51/16 (20060101)
B01J 23/28 (20060101)
B01J 23/16 (20060101)
B01J 27/14 (20060101)
B01J 27/19 (20060101)

Abstract

A process for the direct oxidation of isobutane or propane to methacrylic acid or acrylic acid respectively is disclosed. The process encompasses contacting a feed gas containing isobutane or propane and oxygen with a specific catalyst which is composed of molybdenum, antimony and phosphorus combined with oxygen. The atomic ratio of molybdenum to antimony to phosphorous is from about 9 to about 24; about 0.25 to about 2; and about 0.75 to about 2 respectively. The catalytic oxidation to methacrylic or acrylic acid is accomplished at a temperature of from about 200° C. to about 450° C. The methacrylic or acrylic acid is removed from the feed gases exiting from the reaction zone and the remainder of the exited feed stream may be recycled to again contact the catalyst.