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19 Nov 2019
The reaction CH_4 + C_3 H_8 rightarrow 2C_2 H_6 is very fast and reaches thermodynamic equilibrium in the reactor. The equilibrium constant for the reactor is 15.2. The feed to the reactor (not the fresh feed to the process) enters at 106 mol/hr and contains mole fractions of 0.332 CH_4, 0.538 C_3 H_8 and the balance Inerts (I). The reactor effluent is sent to a distillation column where pure C_2 H_6 comes out the bottom and the remaining components leave the top of the column. Five percent of the stream leaving the top of the distillation column is purged and the rest is recycled. Draw and label a process flow diagram. Clearly number each stream. Calculate the molar flow rates (mol/hr) and mole fractions of the purge and product (bottoms of distillation column) streams. Calculate the molar flow rate (mol/hr) and mole fractions of the fresh feed stream. The equilibrium constant drops by 25%. Will the extent of reaction increase, decrease or stay the same?
The reaction CH_4 + C_3 H_8 rightarrow 2C_2 H_6 is very fast and reaches thermodynamic equilibrium in the reactor. The equilibrium constant for the reactor is 15.2. The feed to the reactor (not the fresh feed to the process) enters at 106 mol/hr and contains mole fractions of 0.332 CH_4, 0.538 C_3 H_8 and the balance Inerts (I). The reactor effluent is sent to a distillation column where pure C_2 H_6 comes out the bottom and the remaining components leave the top of the column. Five percent of the stream leaving the top of the distillation column is purged and the rest is recycled. Draw and label a process flow diagram. Clearly number each stream. Calculate the molar flow rates (mol/hr) and mole fractions of the purge and product (bottoms of distillation column) streams. Calculate the molar flow rate (mol/hr) and mole fractions of the fresh feed stream. The equilibrium constant drops by 25%. Will the extent of reaction increase, decrease or stay the same?