This invention relates to packed tower or {TAIL ~ packed column structures} used for intimate contact between a gas and a liquid to effect {HEAD ~ mass transfer therebetween} 
This invention relates to packed tower or { TAIL ~ packed column structures } used for intimate contact between a gas and a liquid to effect { HEAD ~ mass transfer therebetween }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD