Question $1$

In several countries, biodiesel is produced from soybean oil. The oil first needs to be extracted from soybeans

using the steady state process shown in Figure $1$ below.

a$.$ Identify all streams containing protein. $($This is actually the most valuable material in this process.$)$

b$.$ Calculate the total flow rate of stream $2,$ in $k\frac{g}{h}.$

c$.$ Calculate the flow rate of oil in stream $2$ and in stream $6($in $k\frac{g}{h})$ and give the percentage oil recovery

for this process.

d$.$ Calculate the flow rate of stream $5.$

e$.$ It is further known that i$)$ the oil recovery unit recovers only $90\%$ of the oil in stream $3,$ and ii$)$ that the

lean stream $(4)$ is $95\%$ hexane. Express this information mathematically.

Figure $1$