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:
Oct. 12, 1976
Filed:
Aug. 31, 1973
Heinz Erpenbach, Surth, DT;
Klaus Gehrmann, Hurth-Knapsack, DT;
Winfried Lork, Erftsdadt Friesheim, DT;
Peter Prinz, Hurth-Burbach, DT;
Hoechst Aktiengesellschaft, Frankfurt/Main, DT;
Abstract
Production of acrylic acid by reacting acrolein with molecular oxygen in the presence of steam and, if desired, inert gases at elevated temperature in contact with a fixed bed of cobalt molybdate catalyst prepared by precipitating cobalt molybdate from the combined aqueous solutions of a cobalt salt, of a molybdenum compound and of ammonia at a temperature of about 60.degree.C and at a pH of at most 7; filtering off, washing and drying the precipitate at a temperature of at least 100.degree.C; heating the dry cobalt molybdate for several hours at elevated temperatures, grinding and transforming it into shapes; and sintering the cobalt molybdate shapes for several hours. The acrylic acid is more particularly produced in contact with a catalyst prepared by combining the aqueous solution of the cobalt salt with that of the molybdenum compound in the atomic ratio of Co:Mo of about 1.05:1; establishing in the combined solutions a pH between 3.8 and 6.0; drying the precipitate at 110.degree.-170.degree.C; heating the dry cobalt molybdate to temperatures between 250.degree. and 550.degree.C; and sintering the cobalt molybdate shapes at temperatures between 500.degree. and 700.degree.C so as to obtain a cobalt molybdate catalyst having an inner surface area between 4 and 8 square meters/g and a volume of pores between 0.1 and 0.2 milliliters/g.