Reaction conversion A. Consider the generic reaction A 3B, occurring in a batch

Question

Reaction conversion   

A. Consider the generic reaction A 3B, occurring in a batch reactor. If there are initially 20 g moles of A present, what is the conversion XA if 34 g moles of B are present at the end of the batch reaction process, assuming there is 1.0 mole of B present at the beginning of the batch process?

B. Consider two parallel reactions A C + D and A B, both of which are occurring in a CSTR. The inlet molar flow of A is FA0 = 400 gr mole/min, with a volumetric (liquid) flow rate of v0 = 20 liters/min. If the steady state effluent from the CSTR contains product concentrations of 12.0 g mole/L of C and 3.0 g mole/L of B (assume that there are no product B, C or D in the influent flow), then what is the conversion XA? You should assume the volumetric flow rate is constant (reaction occurs in liquid state).

Explanation / Answer

Ans a

The given reaction

A = 3B

Initial moles of A = 20

initial moles of B = 1

Let the moles of A converted into product = x

After the reaction process

Moles of A = 20 - x

Moles of B = 1 + 3*x

Given that moles of B after the reaction = 34

1 + 3*x = 34

x = 11 mol

Conversion of A=moles of A converted x 100 / initial moles of A

= 11*100 / 20

= 55%

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