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