Preparation of acrolein by heterogeneously catalyzed partial...

Details Preparation of acrolein by heterogeneously catalyzed partial... Preparation of acrolein by heterogeneously catalyzed partial...

2007-04-24

2007-04-24

Witherspoon, Sikarl A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S479000

Reexamination Certificate

active

10974831

ABSTRACT:
Acrolein is prepared by a process of heterogeneous catalyzed partial gas phase oxidation, by passing a starting reaction gas mixture which comprises propene, molecular oxygen and at least one inert gas, in which the molecular oxygen to propene (O2:C3H6) mole ratio is ≧1, and carbon dioxide and saturated hydrocarbons together in a total amount of at most 15 mol %, at elevated temperature and at an hourly space velocity on the fixed catalyst bed of propene present in the starting reaction gas mixture of ≧120 l (STP)/l·h through a fixed catalyst bed whose catalysts are comprised of annular unsupported catalysts whose active component is at least one multimetal oxide of formula I,in-line-formulae description="In-line Formulae" end="lead"?Mo12WaCobFecBidSieKfOn  (I)in-line-formulae description="In-line Formulae" end="tail"?whereina ranges from ≧1 to ≦3, b ranges from ≧3 to ≦8, c ranges from ≧1 to ≦4, d ranges from ≧0.5 to ≦1.5, e ranges from ≧0 to ≦10, and f ranges from ≧0 to ≦0.2 and n is a number which is determined by the valency and frequency of the elements in the composition of formula I other than oxygen,in such a way that the propene conversion in single pass is ≧90 mol % and the associated selectivity of acrolein formation is ≧80 mol %, wherein,in the multimetal oxide composition of formula I, the following mole ratios are: Co/Fe=from 2 to 4 and Co/Mo=from 0.3 to 0.7.

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