CHAPTER 2 (Process Variables) - PROCESS VARIABLES...

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PROCESS  VARIABLES    MS. NORILHAMIAH YAHYA 
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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.
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  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 Volume 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 1 = SV
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  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 =
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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)
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  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      Volumetric flowrate : volume per unit time (Q ) Molar flowrate , : moles per unit time 
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CHAPTER 2 (Process Variables) - PROCESS VARIABLES...

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