Lecture03

# Lecture03 - ChE 21-3 Meeting 3 Januaryr 14 2011 Outline{FER...

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Unformatted text preview: ChE 21-3: Meeting 3 Januaryr 14. 2011 Outline {FER Sections 3.1-3.3} Homework Due Friday D1i2‘ii2011 I Process Variables 2.1. 2.2. 2.8. 2.9. 2.25. 2.31. 3.3 - Mass and Volume I Flow Rates - Chemical Composition Mass and Volume . mass (m) density (p) = W Speciﬁc gravity = density [p] m .3, volume [V] n 1 speciﬁc volume _ mass (m) p Densities of pure liquids and solids are essentially independent of pressure and vary only slightlyr with temperature. for example pH20{DoC} = I I _- 9H29{3.93°C} = ' pH20(1UUDC} = Speciﬁc gravities for many compounds can be found in Table 3.1 in F&R HS GhE 211]: Meeting 3 January.r '14. 2011 Calouiate the density [kgiL] of sodium hydroxide at 20°C. Flow Rate Flow rate is the amount of material transported through a process line in a speciﬁed amount of time. mass [m] mass ﬂow rate m = _ [ ] time [t] , (“J volume (V) 1ir'olumetrlo flow rate V =— time [t] 24'5 ChE 21D: Meeting 3 January14.2t'i11 Calouiate the mass flow rate of ethanol [kgie] for a volumetrio ﬂow rate of 3.0 [Umin]. For a ﬂuid is ﬂowing through a cone-shaped pipe 1.} How does the mesa flow rate at the inlet compare to the outlet? 2.) How does the volumetric flow rate at the inlet oompare to the outlet? 1 *1 wot outta at: xele 14 at“ the item: I'm"- ‘1 -......_' . . --.|- H BIS ChE 210: Meeting 3 Januarv14.2011 Chemical Composition Molecular weight relates the mass of a species (m) to the moles of a species {n}. Molecular weight is a conversion factor. Example: Molecular weight (M) of CO; = 44.01 1 mol (302 = 44.01 g 002 1 kmol CO; = 44.01 kg {302 1 [b-mol CO: = 44.01 lbm CO; The same conversion factors used to convert between mass units can be used to convert between mole units. It' .-L'u -'.'¢ 7 Process streams frequentlv contain more than one component. so compositions are often reported as mass or mole fractions. mass fraction (m) = Susi)“ c. mess I moles A mole fraction (50;) = m A basis of calculation must be assumed to convert between it and v. #5 ChE 21!]: Meeting 3 Jensen“I 14. 24311 Calculate the motor composition for a process stream with the following mess composition. Mess fraction (1:) Mole Fraction {3;} — I' . .' .“rh'. '- l-l .'1i'. .-i .. ..I_ 1-II1 .v*|I-|.- . I ._ I. '1 'i i1l-'- -'!-.-E.. .:.-.'u "- It. I IL" 51"5 ...
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## This note was uploaded on 07/31/2011 for the course CHEM E 210 taught by Professor Shanks during the Spring '02 term at Iowa State.

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Lecture03 - ChE 21-3 Meeting 3 Januaryr 14 2011 Outline{FER...

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