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Review Session1-post - production rate of dried pulp and...

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Review Session 1 Fall 2011 Unit Conversions Mass/Mole Fractions Temperature Scales Pressure Material Balances on a Single Unit
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A pressure gauge indicates that the pressure inside a reaction vessel is 312.2 psig. If the barometric pressure is 753 mm Hg, what is the vessel’s absolute pressure expressed in kPa? Review Session 1 Fall 2011 average MW = mgrams mmoles = 400 mg 0.6427 mmol = 622 g mol P abs =2253 x 10 3 Pa
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Review Session 1 Fall 2011 P 1 P 2 = gh 3 ( ρ Hg ρ sulfuric ) P 1 P 2 = 18,404 kg m s 2 = 18,404 Pa Wet paper pulp contains 36 wt% water. This pulp is to be processed in a drier (i.e water is to be removed) to produce a pulp containing 11 wt% water. If the wet pulp enters the drier at a rate of 3524 kg/hr, calculate the
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Unformatted text preview: production rate of dried pulp and the rate of removal of water (kg/hr)? Dried pulp =2534 kg/hr Water removal = 990 kg/hr The Spent acid from a nitrating process contains 43 wt% H 2 SO 4 , 36 wt% HNO 3 ,and the balance H 2 O. This acid is to be strengthened for re-use by the addition of concentrated sulfuric acid (91 wt% H 2 SO 4 , balance H 2 O) and concentrated Nitric acid (88 wt% HNO 3 , balance H 2 O). The resulting mixed acid is to contain 40 wt% H 2 SO 4 and 43 wt% HNO 3 . Calculate the quantities (kg) of spent and concentrated acids which should be mixed to yield 1000 kg of mixed acid. Spent acid = 608.5 kg Sulfuric acid = 151.8 kg Nitric acid = 239.7 kg...
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