Method for packing with {HEAD ~ catalyst} for synthesis of {TAIL ~ unsaturated aldehyde} and unsaturated carboxylic acid 
Method for packing with { HEAD ~ catalyst } for synthesis of { TAIL ~ unsaturated aldehyde } and unsaturated carboxylic acid
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH