The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 1980
Filed:
Dec. 05, 1978
Svend E Pedersen, Mentor, OH (US);
Ming N Sheng, Cherry Hill, NJ (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
An unsaturated normal aliphatic hydrocarbon of 4 or 5 carbon atoms and an oxygen-containing gas react to form an effluent containing maleic anhydride as a result of a reaction in the presence of a catalyst consisting essentially of a mixture of the oxides of tungsten, phosphorus, a Group A metal, and a multivalent metal having an atomic number from 21 to 47, the sum of the oxides of the Group A metal and the multivalent metal constituting from 1% to 15% of the catalyst, the atom ratio of the Group A metal to the transition metal being within a range from about 1:1 to about 8:1 and the overall atomic ratios are such that W:P:A:M corresponds to 1:0.1-0.7:0.01-0.16:0.01-0.1. In preferred embodiments the reaction is conducted in the presence of from about 3% to about 50% by volume of steam, desirably from about 5% to about 7% by volume steam, whereby catalyst stability and selectivity are enhanced.