The existing styrene production facility can include separation apparatus to remove {HEAD ~ at least a portion} of any benzene from the new product stream, an alkylation reactor to form ethylbenzene by reacting the benzene with ethylene, and {TAIL ~ a dehydrogenation reactor} to form styrene by dehydrogenating ethylbenzene 
The existing styrene production facility can include separation apparatus to remove { HEAD ~ at least a portion } of any benzene from the new product stream , an alkylation reactor to form ethylbenzene by reacting the benzene with ethylene , and { TAIL ~ a dehydrogenation reactor } to form styrene by dehydrogenating ethylbenzene
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