# CHAPTER 1 (PART II) - PROCESS VARIABLES ANALYSISANDDATA...

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PROCESS  VARIABLES  ANALYSIS AND DATA  PRESENTATION MS. NORILHAMIAH BINTI YAHYA  Ext Room: 2046

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Free Template from www.brainybe 2 Process Variables??? The quantities used to describe a process and these must be measured and computed PROCESS    Feed INPUT    Products  OUTPUT To design or analyze a process, we need to know the amounts, compositions, and condition of materials entering, leaving, and within the process.
Free Template from www.brainybe 3 Types of Process variables Mass and flow Chemical composition Temperature Pressure

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Free Template from www.brainybe 4 Mass and Flow In Chemical processes there are a number of variable that typically play an important role. Density ( ρ ) : The mass of a material per unit volume (kg/m 2 , g/cm 3 , Ibm/ft 3 ) Specific Volume : Volume per unit mass (unit???) v m = ρ ρ 1 = SV
Free Template from www.brainybe 5 Specific Gravity : is the ratio of one’s material density to that of reference material (typically water at 4 o C) ρ reference = 62.4 Ibm/ft 3 = 1000 kg/m 3 REF SG ρ ρ =

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Free Template from www.brainybe 6 EXERCISE: You have a drum containing 8.00 liters of toluene. What is the mass of the liquid ? (given SG toluene = 0.866)
Free Template from www.brainybe 7 Flowrate Flowrate represents the amount of material that moves into or out of a process unit per unit time Mass flowrate : mass per unit time (ms) or     Volumetric flowrate : volume per unit time (Q ) Molar flowrate , : moles per unit time (ns) Relation Q (easiest to measure) to If velocity, v is measured, Q then calculated as m m Q m ρ = A Q ν =

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Free Template from www.brainybe 8 EXERCISE 1. The mass flowrate of n-hexane ( ρ =0.659 g/cm 3 ) in a pipe is 6.59 g/s . What is the volumetric flowrate of the n-hexane? 1. The volumetric flowrate of CCl 4 ( ρ =0.659 g/cm 3 ) in a pipe is 100.0 cm 3 /min . What is the mass flowrate of the CCl4? 1. A steadily flowing steam of water is funneled into a graduated cylinder for exactly 30s , during that time 50 ml is collected. What a) is the volumetric flowrate of the steam? b) is the mass flowrate?
Free Template from www.brainybe 9 Chemical composition Atomic weight is a measure of the mass of an atom (C12 -> 12 units) Molecular weight is the sum of the atomic weights of the atoms that make up a compound.

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