{HEAD ~ A process} 1, in which {TAIL ~ the reaction} of the terephthaloyl chloride with the para phenylenediamine solution is carried out continuously 
{ HEAD ~ A process } 1 , in which { TAIL ~ the reaction } of the terephthaloyl chloride with the para phenylenediamine solution is carried out continuously
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH