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 ethylbenzene by reacting the benzene with ethylene, and {HEAD ~ a dehydrogenation reactor} to form {TAIL ~ styrene} by dehydrogenating ethylbenzene 
to form
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 ethylbenzene by reacting the benzene with ethylene , and { HEAD ~ a dehydrogenation reactor } to form { TAIL ~ styrene } by dehydrogenating ethylbenzene
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