Patent ID: 8802909

Claim:
A method for improving productivity and process stability in a styrene preparation process system comprising: Providing first (R- 1 ), second (R- 2 ), and third (R- 3 ) adiabatic reactors connected in series, the first adiabatic reactor (R- 1 ) having a first heat exchanger (HX- 1 ) located downstream and a first furnace (F-1) located upstream, the second adiabatic reactor (R- 2 ) having a second heat exchanger (HX- 2 ) located downstream and a second furnace (F-2) located upstream, and the third adiabatic reactor (R- 3 ) having a third heat exchanger (HX- 3 ) located downstream and a third furnace (F-3) located upstream; diverging a portion of a raw material containing steam and ethylbenzene downstream from the third heat exchanger (HX- 3 ) to produce a diverged raw material; diverging a portion of a steam having a temperature in the range of 800-900° C. discharged from the first furnace (F-1) to produce a diverged steam; mixing the diverged raw material and the diverged steam to produce a first mixture; and injecting the first mixture at a point (P) downstream from the second adiabatic reactor (R- 2 ) and upstream from the second heat exchanger (HX- 2 ) or injecting the first mixture at a point (Q) downstream from the second heat exchanger (HX- 2 ) and upstream from the third adiabatic reactor (R- 3 ).