Cupric selenite

The Reaction. Acrolein has been produced commercially since 1938. The first commercial processes were based on the vapor-phase condensation of acetaldehyde and formaldehyde (1). In the 1940s a series of catalyst developments based on cuprous oxide and cupric selenites led to a vapor-phase propylene oxidation route to acrolein (7,8). In 1959 Shell was the first to commercialize this propylene oxidation to acrolein process. These early propylene oxidation catalysts were capable of only low per pass propylene conversions (ca 15%) and therefore required significant recycle of unreacted propylene (9—11). 

Cupric selenite, CuSe03.—At 360° C. cupric oxide combines with selenium dioxide to form the selenite as green rods insoluble in water.10... 

In order to balance mineral intake, the following minerals were used in place of the usual mineral mix (% of diet) potassium chloride, 0.32 magnesium oxide, 0.084 manganous carbonate, 0.0123 ferric nitrate, 0.021 zinc carbonate, 0.0056 cupric carbonate, 0.0011 potassium iodate, 0.0004 sodium selenite, 0.00003 chromium potassium sulfate, 0.00193. 

Cuprie Selenite. CuOjSe mol wt 190.50. Cu 33.35%, O 25.20%, Se 41.45%. CuSeO,. Occurs in nature as the di hydrate, chalcomenite. Prepd by the action of seleni-ous arid or an alkaline selenite on a cupric salt Rocchi -ccioli, Compt Rend. 247, 1108 (1958). 

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