EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
4th Edition
ISBN: 9781119192107
Author: BULLARD
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 6, Problem 6.62P
Interpretation Introduction

(a)

Interpretation:

The flowchart for the given process is to be drawn and labelled. Also, degree of freedom analysis on the process is to be done.

Concept introduction:

A flowchart is the complete representation of a process through boxes or other shapes which represents process units and arrows that represents the input and output of the process. The flowchart must be fully labelled to infer important data about the process involved.

Degree of freedom analysis is the procedure to analyze any missing information needed for material balance calculations. The procedure involves complete labelling of the flowchart representing the process and then determining number of unknown variables (nunknowns) and independent equations (nindep eqns.) from that flowchart.

Mathematically, degree of freedom (ndf) is formulated as:

ndf=nunknownsnindep eqns.

             …… (1)

Interpretation Introduction

(b)

Interpretation:

The equations for the unknown variables are to be written in order and the accounted variable in each equation is to be encircled.

Concept introduction:

In a system, a conserved quantity (total mass, mass of a particular species, energy or momentum) is balanced and can be written as:

input+generationoutputconsumpumtion=accumulation

Here, ‘input’ is the stream which enters the system. ‘generation’ is the term used for the quantity that is produced within the system. ‘output’ is the stream which leaves the system. ‘consumption’ is the term used for the quantity that is consumed within the system. ‘accumulation’ is used for the quantity which is builds up within the system.

All the equations which are formed are then solved simultaneously to calculate the values of the unknown variables.

For binary mixture in vapor-liquid equilibrium, Raoult’s law states that,

xAPA=yAPxBPB=yBP

             …… (2)

Here, xA and xB are the mole fractions of A and B in liquid phase respectively, PA and PB are the vapor pressure of A and B respectively, yA and yB are the mole fractions of A and B respectively and P is the total pressure of the system.

Antoine equation is used to determine the vapor pressure of any substance at the given temperature by the equation:

log10P=ABT+C

             …… (3)

Here, A, B and C are the constants specific for a substance given in table B.4 of appendix B.

An ideal gas is the gas which obeys ideal gas laws which is a simplified equation of states.

A real gas behaves as an ideal gas at higher temperature and lower pressure. At STP, a mole of an ideal gas has a volume of 22.4 L.

Interpretation Introduction

(c)

Interpretation:

The final temperature, composition of the liquid products, and the molar flow rates of the liquid and vapor product streams are to be calculated.

Concept introduction:

In a system, a conserved quantity (total mass, mass of a particular species, energy or momentum) is balanced and can be written as:

input+generationoutputconsumpumtion=accumulation

Here, ‘input’ is the stream which enters the system. ‘generation’ is the term used for the quantity that is produced within the system. ‘output’ is the stream which leaves the system. ‘consumption’ is the term used for the quantity that is consumed within the system. ‘accumulation’ is used for the quantity which is builds up within the system.

All the equations which are formed are then solved simultaneously to calculate the values of the unknown variables.

For binary mixture in vapor-liquid equilibrium, Raoult’s law states that,

xAPA=yAPxBPB=yBP

             …… (2)

Here, xA and xB are the mole fractions of A and B in liquid phase respectively, PA and PB are the vapor pressure of A and B respectively, yA and yB are the mole fractions of A and B respectively and P is the total pressure of the system.

Antoine equation is used to determine the vapor pressure of any substance at the given temperature by the equation:

log10P=ABT+C

             …… (3)

Here, A, B and C are the constants specific for a substance given in table B.4 of appendix B.

An ideal gas is the gas which obeys ideal gas laws which is a simplified equation of states.

A real gas behaves as an ideal gas at higher temperature and lower pressure. At STP, a mole of an ideal gas has a volume of 22.4 L.

Interpretation Introduction

(d)

Interpretation:

The assumptions made during the calculations which may induce some errors in the calculations are to be listed.

Concept introduction:

A gas behaves as an ideal gas at high temperature and low pressure. Any deviation from this leads to the real gases.

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Chapter 6 Solutions

EBK ELEMENTARY PRINCIPLES OF CHEMICAL P

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