Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1973-08-31
1976-10-12
Weinberger, Lorraine A.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
252470, C07c 5704, C07c 5126
Patent
active
039858006
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.
REFERENCES:
patent: 3322693 (1967-05-01), Bethell et al.
patent: 3365489 (1968-01-01), Bethell et al.
patent: 3415760 (1968-12-01), Hadeley et al.
patent: 3578707 (1971-05-01), Bethell et al.
Erpenbach Heinz
Gehrmann Klaus
Lork Winfried
Prinz Peter
Connolly Arthur G.
Hoechst Aktiengesellschaft
Kelly Richard D.
Weinberger Lorraine A.
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