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The EB process involves sparging gaseous ethylene into the liquid phase of the first of two CSTR reactors in series. Both reactors operate at high pressure (20 atm) to maintain liquid in the reactor at the high temperatures required for reasonable reaction rates (433 K). A large liquid benzene stream is also fed to the first reactor. The heat of the exothermic reaction is removed by generating 2.5 atm steam in this reactor. The effluent from the first reactor is fed into the second reactor along with a recycle stream of DEB. This reactor is adiabatic. The effluent from the second reactor is fed to a distillation column that produces a distillate that is mostly benzene, which is recycled to the first reactor along with the fresh feed of make-up benzene. The bottoms stream is a mixture of EB and DEB. It is fed to a second distillation column that produces an EB distillate and a DEB bottoms, which is recycled back to the second reactor. Note that a two-reactor flowsheet is used so that high conversion of the ethylene can be achieved in the first reactor and conditions are favorable in the second reactor for the reaction of DEB back to EB (higher concentration of DEB)
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