Chapter 9, Problem 9.82P

Interpretation Introduction

(a)

Interpretation:

Flow chart for the process should be prepared. Also, the degree of freedom for the process should be determined.

Concept introduction:

Flow chart for the process is determined on the values of input and output that is the amount of feed entered in the reactor and product formed also helps to predict the amount accumulated during formation of product.

This gives the relation,which is defined as,

Input-output = Accumulation.

The flow sheet for the process is shown below,

For a single reaction system, the final moles of each of the components present, can be estimated by the equation:

$n_i=n_{io}+v_i\xi$

Here, $n_i$ is the final moles of the component $i$, $n_{io}$ is the initial moles of the component $i$, $v_i$ is the stoichiometric coefficient of the component $i$ in the reaction and $\xi$ is the extent of the reaction. $v_i$ is taken as negative for reactants and positive for products.

Mole fraction $\left(y_i\right)$ of any component is given by:

$y_i=\frac{n_i}{\sum n_i}$

Here, $n_i$ is the moles of component $i$ and $\sum n_i$ is the total moles of all the components present in the mixture.

Interpretation Introduction

(b)

Interpretation:

The set of equation identifying the process for the given data should be determined.

Concept introduction:

Mole fraction $\left(y_i\right)$ of any component is given by:

$y_i=\frac{n_i}{\sum n_i}$

Here, $n_i$ is the moles of component $i$ and $\sum n_i$ is the total moles of all the components present in the mixture.

Volumetric flow rate is defined as the product of area for the flow and cross sectional velocity having unit of cubic feet/second.

Interpretation Introduction

(c)

Interpretation:

The values of all equations calculated in part (b) should be calculated.

Concept introduction:

Mole fraction $\left(y_i\right)$ of any component is given by:

$y_i=\frac{n_i}{\sum n_i}$

Here, $n_i$ is the moles of component $i$ and $\sum n_i$ is the total moles of all the components present in the mixture.

Volumetric flow rate is defined as the product of area for the flow and cross sectional velocity having unit of cubic feet/second.

Interpretation Introduction

(d)

Interpretation:

The value of total heat requirements in kW for methane and oxygen preheater should be determined. Also, the value of temperature attained in convertor should be calculated.

Concept introduction:

The amount of heat transferred is

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

$\sum _{out}n{\hat{H}}_i$ is the heat of formation of products.

$\sum _{in}n{\hat{H}}_i$ is the heat of formation of reactants.

The enthalpies of reactants and products depends on the heat capacity and temperature.

Interpretation Introduction

(f)

Interpretation:

The additional steps can be included in the absorber and stripper off gas should be explained.

Concept introduction:

Flow chart for the process is determined on the values of input and output that is the amount of feed entered in the reactor and product is formed also helps to predict the amount accumulated during formation of product.

This gives the relation, which is defined as

Input-output = Accumulation.

The flow sheet for the process is shown below,