Chapter 9, Problem 9.15P

Interpretation Introduction

(a)

Interpretation:

A labeled flow chart should be drawn taking a basis of 1 mol of heptanes feed.

Concept Introduction

The flow chart will be drawn on the basis of given information of reaction:

$C_7{H}_{16}\left(g\right)\to C_6{H}_{5}C{H}_3\left(g\right)+4H_2\left(g\right)$

Interpretation Introduction

(b)

Interpretation:

Taking elemental species [C (s) and H₂ (g)] at 25? as references, an inlet-outlet enthalpy table should be prepared and filled in.

Concept introduction:

The standard heat of formation will be helpful to solve the problem as:

$\Delta H_r^0=\Delta H_f^0{}_{(product)}-\Delta H_f^0{}_{(reac\tan t)}$

Interpretation Introduction

(c)

Interpretation:

The required heat transfer to or from the reactor should be obtained in kJ.

Concept introduction:

Heat transferred is determined by the formula:

$Q=\sum {}_{out}{n}_i{H}_i-\sum {}_{in}{n}_i{H}_i]$

Interpretation Introduction

(d)

Interpretation:

The heat of the heptanes dehydorcyclization reaction should be calculated at 400? and 1atm.

Concept Introduction

The heat of the heptanes dehydorcyclization reaction is determined using the formula:

$\Delta H_r(400°C)=\frac{Q(Changeinheat )\text{}}{(molesofreactant)}$

Interpretation Introduction

(e)

Interpretation:

It should be explained that why the calculation is done in part (c) instead of directly looking up the heat of reaction at 400 ^o C.

Concept Introduction

In this particular case, the heat of reaction at 400°C is the heat required (given to the reactor) for the reaction to be carried out. It is equal to the heat provided for the reactor and can be calculated either the way.