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