d. A natural gas processing plant is to separate natural gas into an ethane stream, a propanebutane stream, and a sales gas stream that is mainly methane. The natural gas feed rate is 2500kgmol/h, and the composition is 83%,12%,4%, and 1% mole of methane, ethane, propane, and n-butane, respectively. The ethane product stream contains 1mol percent methane, 2mol percent propane, and negligible butane. The propane product stream contains all the butane/propane, 2mol percent ethane, and negligible methane. The sales gas contains 0.5mol percent ethane, and the rest is methane. i. Draw a block diagram for this process. [2] ii. Calculate the flow rate of each product stream. [9]