EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
4th Edition
ISBN: 9781119192107
Author: BULLARD
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 4, Problem 4.6P
A liquid mixture of acetone and water contains 35 mole% acetone. The mixture is to be partially evaporated to produce a vapor that is 75 mole% acetone and leave a residual liquid that is 18.7 mole% acetone.
(a) Suppose the process is to be carried out continuously and at steady state with a feed rate of lO.Okmol/h. Let ziv and zii be the flow rates of the vapor and liquid product streams, respectively. Draw and label a process flowchart, then write and solve balances on total moles and on acetone to determine the values of zzv and zii. For each balance, state which terms in the general balance equation (accumulation = input + generation — output — consumption) can be discarded and why. (See Example 4.2-2.)
(b, Now* suppose the process is to be carried out in a closed container that initially contains 10.0 kmol of the liquid mixture. Let ziv and zz, be the moles of final vapor and liquid phases, respectively. Draw' and label a process flowchart, then write and solve integral balances on total moles and on acetone. For each balance, state which terms of the general balance equation can be discarded and why.
(c) Returning to the continuous process, suppose the vaporization unit is built and started and the product stream flow' rates and compositions are measured. The measured acetone content of the vapor stream is 75 mole% acetone, and the product stream flow rates have the values calculated in Part (a). However, the liquid product stream is found to contain 22.3 mole% acetone. It is possible that there is an error in the measured composition of the liquid stream, but give at least five other reasons for the discrepancy. [Think about assumptions made in obtaining the solution of Part (a).]
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Q2: A stream of liquid water at a rate of N lit/s with a stream of methanol and
ethanol mixture (contains 25 mol% methanol) are fed to continues evaporator.
Another stream of methanol at a molar flow rate of G that of the alcohol mixture
stream is fed to the same unit. If the liquids are evaporated totally and the produced
vapor stream contains (0.1"G) mol% of water at a pressure of 28 psi and 220 F.
calculate:
1- The flow rate and composition of all streams in a molar, mass, and volumetric
basis
2- The average molecular mass of all streams
The Specific gravity of methanol is 0.762 and that of ethanol is 0.789 while the density
of vapors can be estimated as: p= p*Mw/RT where R-0.082 atm.m'/kmol.K.
3. Given: Soda and lime are added to a glass batch in the form of soda ash (Na,CO,) and limestone
(CaCO). During heating, these two ingredients decompose to give off carbon dioxide (CO₂), the
resulting products being soda and lime.
Find: Compute the weight of soda ash and limestone that must be added to 110 lb of quartz (SiO₂)
to yield a glass of composition 72 wt% SiO₂, 16 wt% Na₂O, and 12 wt% Cao.
Solution:
A solution containing 100 lbm KNO 3/100 lbm H 2O at 80°C is fed to a cooling crystallizer operated at 25°C. Slurry from the crystallizer (KNO3 crystals suspended in saturated solution) is fed to a filter, where the crystals are separated from the solution. Use the solubility data in Figure 6.5-1 to determine the production rate of crystals (lbm/lbm feed) and the solid-to-liquid mass ratio (lbm crystals/lbm liquid) in the slurry leaving the crystallizer.
Chapter 4 Solutions
EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
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