Hydrogenation of Ethylbenzene to Styrene Reaction: C₈H₁₀ → C₈H₈ + H₂ΔHᵣ°(300°C) = -124 kJ/mol (exact value unknown) Process Description: The basis is 1000 kg/h of separated styrene. The reaction conversion rate is 35%. The temperature increase in heat exchanger 2 is adiabatic. A fresh stream of pure ethylbenzene (25°C) enters a mixing vessel, where it is combined with a recycle stream (from the distillation column, as explained later), which also consists of pure ethylbenzene at 25°C. After mixing, the stream is sent to a heat exchanger (HX1), where the mixture is heated to 200°C. Next, the mixture enters an adiabatic heat exchanger (HX2), where it is further heated to 300°C by adding steam (at 350°C). This steam is used to prevent side reactions and carbon deposition in the reactor. The heated mixture is then fed into the reactor, where the reaction takes place with a conversion rate of 35%. As a result, the mixture cools down to 260°C. The resulting mixture is then sent to HX4, where it is cooled down to 25°C. This causes condensation of water, ethylbenzene, and styrene, while H₂ exits HX4 as a gas. The condensed mixture is directed to a water separator, where all water is removed. This water is then sent to HX4, where it is converted back into steam at 350°C for use in HX2 (the water cycle is a closed system). The remaining mixture is sent to a distillation column, where styrene (the final product) is collected as the bottom product, while ethylbenzene is separated as the top product and used as a recycle stream.
Hydrogenation of Ethylbenzene to Styrene
Reaction: C₈H₁₀ → C₈H₈ + H₂
ΔHᵣ°(300°C) = -124 kJ/mol (exact value unknown)
Process Description:
The basis is 1000 kg/h of separated styrene. The reaction conversion rate is 35%. The temperature increase in heat exchanger 2 is adiabatic.
A fresh stream of pure ethylbenzene (25°C) enters a mixing vessel, where it is combined with a recycle stream (from the distillation column, as explained later), which also consists of pure ethylbenzene at 25°C. After mixing, the stream is sent to a heat exchanger (HX1), where the mixture is heated to 200°C.
Next, the mixture enters an adiabatic heat exchanger (HX2), where it is further heated to 300°C by adding steam (at 350°C). This steam is used to prevent side reactions and carbon deposition in the reactor.
The heated mixture is then fed into the reactor, where the reaction takes place with a conversion rate of 35%. As a result, the mixture cools down to 260°C.
The resulting mixture is then sent to HX4, where it is cooled down to 25°C. This causes condensation of water, ethylbenzene, and styrene, while H₂ exits HX4 as a gas. The condensed mixture is directed to a water separator, where all water is removed. This water is then sent to HX4, where it is converted back into steam at 350°C for use in HX2 (the water cycle is a closed system).
The remaining mixture is sent to a distillation column, where styrene (the final product) is collected as the bottom product, while ethylbenzene is separated as the top product and used as a recycle stream.
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