Question

A fuel gas is repeated to analysis on a mole basis 20% CH4 , 5% C2H6 and the remaining CO2 . Calculate the analysis of fuel gas on mass
percentage .​

Answer 1

Answer:

MATERIAL BALANCES AND APPLICATIONS

4.1. Introduction

Material balances are important first step when designing a new process or analyzing an

existing one. They are almost always prerequisite to all other calculations in the solution of

process engineering problems.

Material balances are nothing more than the application of the law of conservation of mass,

which states that mass can neither be created nor destroyed. Thus, you cannot, for example,

specify an input to a reactor of one ton of naphtha and an output of two tons of gasoline or

gases or anything else. One ton of total material input will only give one ton of total output,

i.e. total mass of input = total mass of output.

A material balance is an accounting for material. Thus, material balances are often compared

to the balancing of current accounts. They are used in industry to calculate mass flow rates of

different streams entering or leaving chemical or physical processes.

4.2. The General Balance Equation

Suppose propane is a component of both the input and output streams of a continuous process

unit shown below, these flow rates of the input and output are measured and found to be

different.

qin (kg propane/h) qout (kg propane/h)

If there are no leaks and the measurements are correct, then the other possibilities that can

account for this difference are that propane is either being generated, consumed, or

accumulated within the unit.

A balance (or inventory) on a material in a system (a single process unit, a collection of units,

or an entire process) may be written in the following general way:

Process unit