CinChE Drill and Practice Examples Drill and Practice … · CinChE Drill and Practice Examples ... Qset_05 Material Balances without Chemical Reactions . ... since they are not needed

CinChE Drill and Practice Examples

v91.07.29 © 1991, Michael E. Hanyak, Jr., All Rights Reserved Page E-1

Drill and Practice Problems This document contains a set of problem solutions that follow the problem-solving strategy described in Chapter 4 of the CinChE manual. They represent the drill and practice problems cited in Appendix E of the CinChE manual. A brief description of each problem is given next.

Problem # Problem Descr iption Page #

1 Calculate a mass velocity for another set of units. E-02 2 Determine the molecular weight of a compound using atomic weights. E-02 3 Determine the temperature of a process stream using various units. E-03 4 Calculate a specific heat capacity for another set of units. E-03 5 Convert mole fractions to mass fractions for a chemical mixture. E-04 6 Determine the molar volume and molar density of a chemical mixture. E-05 7 Determine the specific gravity and volume of a chemical mixture. E-06 8 Determine the specific gravity and density of a chemical mixture. E-07 9 Determine the average molecular weight of a chemical mixture. E-08

10 Convert gauge pressure to absolute pressure using a barometer reading. E-09 11 Determine the gauge pressure at a point below the surface of the sea. E-09 12 Complete the molar balances to mix two liquid process streams. E-10 13 Complete the molar balances for a distillation column. E-11 14 Complete the mass balances to mix two petroleum streams. E-13 15 Complete the mass balances for a distillation column. E-14 16 Complete the molar balances for a chemical reactor. E-16

Some of these sixteen problem solutions in the remaining pages of this document reference materials in other parts of the CinChE manual, as indicated by the yellow highlighted text. In addition to these problem solutions, fourteen self-paced quiz sets listed in the table below are provided to help you enhance your understanding of basic concepts. Use the first column links to access them.

Web Link General Descr iption of Quiz Set Qset_01 Managing Your Time, and Gaussian Elimination Qset_02 Basic Process Variables in Table “gotche” Qset_03 Basic Process Variables in Table “gotche” Qset_04 Curve Fitting of Experimental Data Qset_05 Material Balances without Chemical Reactions Qset_06 Material Balances without Chemical Reactions Qset_07 Material Balances with Chemical Reactions Qset_09 Pressure-Temperature (PT) and Pressure-Volume-Temperature (PVT) Diagrams Qset_10 Temperature-Composition (TXY) Diagrams and Raoult’s Law Qset_11 Enthalpy Tables and Pressure-Enthalpy (PH) Diagrams Qset_12 Enthalpy Equations for Pure Compounds and Mixtures of Chemical Compounds Qset_13 Enthalpy with Phase Change, and non-Ideal Solution Enthalpy Qset_14 Flash Vaporization of Liquid Water Qset_15 Enthalpy and Heats of Formation, and How Hard Must Your Heart Work

If you have any questions about these example problems or quiz sets, please consult with one of your teammates or contact the instructor. The instructor is very willing to help you, if you ask.

http://www.departments.bucknell.edu/chem_eng/cheg200/CinChE_Manual/Pdxs/examples/Quiz_01Qs.pdf�














CinChE Example Problem Solutions Appendix E




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see Page A-18

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see units equivalences in Table "gotche", Page 3-3





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Note that F° means Δ°F, and C° means Δ°C. The common practice in chemical engineering is to express the delta temperature unit in the heat capacity (i.e., specific heat) using °C or °F. For example, "kJ/(mol °C)" — as illustrated in Table B.2 of the Felder and Rousseau textbook, 3rd Ed. For heat capacity, you must remember that its °C or °F unit is a delta degree and not a degree.

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see Page 3-9

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see units equivalences in Table "gotche", Page 3-3 and 3-6



or



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see Appendix D:



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see Page 3-12

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L

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see Appendix D:

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Click here for definition of API gravity.

http://en.wikipedia.org/wiki/API_gravity



ideal solution



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see Appendix D:

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see Appendix D:



psig.



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see Table "gotche" in Ch. 3, Page 3-4

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see Page 3-10

A light oil containing 75 mol% C9 and 25 mol% C11 is mixed with a heavy oil containing 20 mol% C9 and 80 mol% C11. What molar flow rate of the light oil must be mixed with the heavy oil toproduce a desired liquid fuel containing 35 mol% C9 and 65 mol% C11 that flows at 100 lb-molper second?



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temperatures and pressures were not listed in the diagram, since they are not needed in the solution

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see Page 5-6

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see Gaussian Elimination on Page C-8

A stream of natural gasoline is feed to a distillation column to produce a medium-octane gasoline as abottoms stream and an overhead distillate stream of lighter hydrocarbons. Based on the data in the tablebelow, how many liters per day of medium-octane gasoline can be produced from 50,000 bbl/d of naturalgasoline?

Feed Bottoms Product Mol. Wt.----------- ------------ ------------ -------------

C6H14 25 mol% 0 mol% 60 mol% 86C7H16 25 mol% 22 mol% 30 mol% 100C8H18 50 mol% 78 mol% 10 mol% 114

The mass density for each of the three streams is 0.8 g/cm3.



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see Page 5-6 and Table "gotche"

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L/d

L / d



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Click here to find the units equivalence between U.S. petroleum barrel (bbl) and cm3.

http://www.onlineconversion.com/

Heavy naphtha from one process unit (Stream A) is mixed with heavy naphtha from another process unit(Stream B) to produce the feed (Stream F) that enters a third process unit. Stream A contains 60 percent C6and 40 percent C8 hydrocarbons. Stream B contains 50 percent C6 and 50 percent C8 hydrocarbons.Stream F contains 53 percent C6 and 47 percent C8 hydrocarbons. For a Stream A flow rate of 200 kg/s,what is the ratio of heavy naphtha in Stream A to that in Stream B?



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see Page 5-2

Part A. A feed to a stripping column flows at 18,000 bbl per hour and contains 58.3 percent by masskerosene and 41.7 percent light hydrocarbons. The vapor stream leaving the top of the stripping columncontains only the light hydrocarbons, while the liquid stream leaving the bottom of the stripping columncontains only the kerosene. For this perfect separation, what is the flow rate in lbm/h of the of the keroseneleaving the stripping column? The specific gravity of the feed is 32° API.

Part B. A perfect separation is not what happens in practice. Typically, pure kerosene is produced as aliquid in the bottoms stream of the stripper, and the vapor stream contains 80 percent by mass lighthydrocarbons and 20 percent kerosene. Under these conditions, how much kerosene is produced?

mK in lbm / h



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see Page 5-2 and Table "gotche"

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see Page 5-2

16





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see Page 5-6

g-rxn / hr





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CinChE Drill and Practice Examples Drill and Practice … · CinChE Drill and Practice Examples ... Qset_05 Material Balances without Chemical Reactions . ... since they are not needed