The Solvay process uses {HEAD ~ poisonous ammonia gas} with {TAIL ~ a complex column system} to extract the said products 
The Solvay process uses { HEAD ~ poisonous ammonia gas } with { TAIL ~ a complex column system } to extract the said products
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH