Gas-Phase Catalytic Dehydrogenation of 1-Butene to 1,3-Butadiene
Gas-Phase Catalytic Dehydrogenation of 1-Butene to 1,3-Butadiene
1,3-Butadiene can be produced by gas-phase catalytic dehydrogenation of 1-Butene in the reaction ⇌+. To suppress the reverse reaction, steam (acting as an inert gas) is added. The dilution factor is equal to the number of moles of steam added per mole of 1-Butene. The Demonstration computes the equilibrium conversion vs. the dilution factor using Gibbs free energy minimization. The user can set values of the temperature , expressed in Kelvin, as well as the pressure , expressed in atm. Here, only low to moderate values of the pressure are allowed. Thus, the gas mixture behaves as an ideal gas.
C
4
H
8
C
4
H
6
H
2
T
P
In accordance with Le Chatelier's principle, you can verify that:
(1) the conversion is favored when you increase the temperature, since the reaction is endothermic (=109.780kJ/mole).
o
ΔH
298.15
(2) the forward reaction is favored by low pressures and high dilution factors. Indeed, there are more moles of product than reactant (=+1).
Δν
i
Finally, the results of our calculations at and (red dots) agree very well with those obtained with Aspen Plus (chemical process optimization software) using the built-in module entitled RGIBBS (green triangles in snapshot 4).
T=900K
P=1atm