2:40 PM C O U a48dra-rcqh-gdv >Problems87flowsheets: the recycle and the bypass. We noted that these configurations arereadily accommodated by means of a special process unit called the flow splitter.Finally, we concluded the chapter with examples illustrating the use of basis re-location and balance set selection which can often reduce a multiunit problem toa sequence of zero degree-of-freedom single-unit problems. At this stage, youshould be able to formulate and solve most multiunit material balance problemsthat do not involve chemical reactions.PROBLEMS(a) A feed stream to a dryer is specified as 1000 lb,„/h. What is the rate inkg/min?(b) The production rate of ammonia in a process is given as 10° lbmol/day.What is the equivalent rate in gmol/h?2.12.2A still produces a mixture of 90 mol % ethanol (C,H,OH) and the rest water.(a) Calculate the mass fraction of ethanol.(b) If the production rate is 1000 lbmol/h, calculate the equivalent rate inkg/min.(c) For the production rate in (b), calculate the molar flows of the streamcomponents in kgmol/h.2.3A stream consisting of:H,O 0.4C;H¿OH 0.3CH,ОН 0.1CH,СOОH 0.2all in weight fractions, is fed to a distillation column at the rate of 1000 lb/h. Convert these stream variables to:(a) Molar species flows rates.(b) Total molar flow and mole fractions.(c) Mole fractions, water-free basis.A solution containing Na,S, NaOH, and Na,CO, in water is called "whiteliquor" and is used in the paper industry to process wood pulp. Supposethat laboratory analysis indicates 50 g/l Na,S, 250 g/l NaOH, and 100 g/1 !Na,CO3. If the solution density is 1.05 g/cm³, calculate the species molarflows corresponding to a total stream flow of 1000 kgmol/h.2.4A process for producing methane from synthesis gas and steam is fed 6kgmol/min of a gas consisting of 50% H2, 33}% CO, and the rest CH, (allon a mole basis) as well as 72 kg/min of steam (H,0). The products are 3kgmol/min of liquid water and 96 kg/min of a gas consisting of 25% CH4,2.5Alfiana Adhitasari is presenting

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Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Q3: Tests were making on drying a food product carried out in an insulated tray. The temperature of drying air was 60°C. The dry weight of material was 3.765 kg and the surface area 0.186 m2. The test data are given in table below. Time(h) | Weight(kg) 4.944 4.885 4.808 4.699 4.554 4.404 4.241 | 4.15 14 22 3 | 4.2 0.4 0.8 5 7 12 25 4.019 3.955 | 3.955 a) Determine the equilibrium moisture content. b) Calculate the constant and falling rate constant.
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2.1 (a) A feed stream to a dryer is specified as 1000 lb/h. What is the rate in kg/min? (b) The production rate of ammonia in a process is given as 105 lbmol/day. What is the equivalent rate in gmol/h?