176
Fig. 11 Schematic process flow diagram of the commercial propylene ammoxidation process [107]
Main reaction
(i)
Side Reactions
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
The reactions (ii to vii in Scheme 12) among propylene, ammonia and oxygen can lead to the
formation of a number of by-products as follows:
H 2 C=CH-CH 3 + 3/2O 2 +3/2NH 3 o 3/2CH 3 -CN + 3H 2 O -H 2 C=CH-CH 3 + 9/2 O 2 o 3CO 2 + 3H 2 O
H 2 C=CH-CH 3 + 3 O 2 o 3CO + 3H 2 O
H 2 C=CH-CH 3 + O 2 o CH 2 -CH-CHO +3H 2 O
H 2 C=CH-CH 3 + 3O 2 +3NH 3 o 3H-CN + 6H 2 O
H 2 C=CH-CH 3 + 3/2O 2 +3/2NH 3 o 3/2CH 3 -CN + 3H 2 O
NH 3 + 3/4O 2 o 1/2N 2 + 3/2H 2 O
Scheme 12 Non-selective partial and complete oxidation of propylene and ammonia to
by-products
C. Samanta and R. K. Das