Question: Ethylene (C2H4) is produced by mixing with air (mol %21 O2, %79 N2) at a mass flow rate of M kg/st (5046) and reacting with oxygen to produce ethylene oxide (C2H4O). Carbon dioxide and water are formed in a second reaction. 67% of the fed ethylene is converted. The first reaction occurs with 65% efficiency and the second reaction occurs with 2% efficiency. The reaction equations are given below:

C2H4 + 0.5 O2 C2H4O

C2H4 + 3O2 2CO2 + 2H2O

The reaction mixture in the gas phase leaving the reactor is sent to the bottom of an absorption column. 99% of C2H4O is absorbed with water sent from the top of the column, and a watery solution containing 15% C2H4O by weight is taken from the bottom of the column. 1.0% of C2H4O, unreacted C2H4 and other gas components exit the column without being absorbed from the top of the column (C: 12; H: 1; O: 16).

Draw the block flow diagram and establish mass balances around each device and for the entire system.