When the shaped catalyst and the auxiliary packing material each have a ring shape or {TAIL ~ a Raschig ring shape}, the bulk volumes thereof are each a volume of a cylinder defined by {HEAD ~ the circumferential side wall} 
When the shaped catalyst and the auxiliary packing material each have a ring shape or { TAIL ~ a Raschig ring shape } , the bulk volumes thereof are each a volume of a cylinder defined by { HEAD ~ the circumferential side wall }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD