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by: Mrs. Markus Jones


Mrs. Markus Jones
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Class Notes
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This 3 page Class Notes was uploaded by Mrs. Markus Jones on Friday September 18, 2015. The Class Notes belongs to ECH 4224 at University of Florida taught by Staff in Fall. Since its upload, it has received 24 views. For similar materials see /class/206878/ech-4224-university-of-florida in Engineering Chemical at University of Florida.

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Date Created: 09/18/15
Department of Chemical Engineering UNIVERSITY of UP Unit Operations Laboratory Continuous Filtration Overview Separation of solids from liquids is a common operation that requires empirical data to make predictions of performance In this project the performance of two solidliquid ltration devices will be evaluated A slurry of calcium carbonate CaCOg in water will be ltered to achieve solidliquid separation using a hand leaf lter and a continuous rotary lter Recommended slurry concentration is 15 wt CaCOg in water This handout provides an overview of the following topics as they relate to the Continuous Filtration project Purpose Concepts to Review Study Question Prediction of Planned Runs Useful Apparatus Data Possible Objectives In addition you should download and review the handout provided by your faculty advisor Purpose 0 To study the operating parameters modeling and scaleup issues involved in continuous ltration To gain experience in characterizing the behavior of a bench scale operation as a basis for modeling a key step in a process To use the experimental characteristics of the bench scale operation to predict the performance of a production operation and to compare the results of the predicted production operation to the actual performance Originally prepared by Dr Richard Dickinson Chemical Engineering Department University of Florida Gainesville Florida 1999 Revised by Julie N Lawson 2006 Concepts to Review In order to satisfactorily complete this laboratory exercise it is important to have a thorough understanding of the following concepts 0 Filtration 0 Filter cake compressibility 0 Filter cake resistance 0 Flow through porous media Modi ed 4192007 Kevin M Sapp page 13 Original Document Jullie Lawson 2007 UF 1 ivc3 ii iijl amp Department of Chemical Engineering Unit Operations Laboratory Material and energy balance closure Study Questions Ni 5 we m How can you tell When steady state is achieved For a given run at steady state can you achieve a solids mass balance If not Where are the error sources For a given vacuum pressure how does the observed ltrate rate per unit of lter Wheel rotational velocity vary With the residence time of a leaf element of lter surface What literature correlations are available and how do they compare With experimental results For a given lter Wheel rotation rate What is the effect of pressure drop on lter cake moisture con en How does the incremental volumetric rate of ltrate vary With time What about the cumulative rate How do your data vary With pressure drop Is this lter operation characteristic of constant pressure constant rate or a hybrid What are the characteristic modeling parameters for this lter and slurry39 eg speci c cake resistance Do these vary Adapted in part om Chemical Engineering ChE 485486 Laboratories Manual Chemical Engineering Department New Jersey Institute of Technology 199x Prediction ofPlanned Runs The project planning process should include determination of a set of operating conditions to be e Note that it is easy to choose conditions that are outside of the performance limits of the apparatus are insensitive to the different initial conditions or for Which no meaningful parameter values can be determined Carefully study the limitations of the existing experimental a paratus as a part of the planning process rather than nding out in the laboratory run that the experimental values obtained are useless Useful Apparatus Data Modi ed 4192007 Original Docum ent Device DorrOliver Wheel Filter 7 24 in diameter Total Filter W39heel Area 44 z Fraction of Filter Cycle 0 Wet Vacuum cake formation 278 0 Dry Vacuum cake dewatering 346 o Blow in ating lter cloth for Wiping 227 Maximum Vacuum 27 inches of mercury Hg for the lter Wheel 18 in Hg for the handleaf lter Solid Calcium Carbonate Kevin M Sapp page 23 Jullie Lawson 2007 UP I UNIVERSITY of Department of Chemical Engineering Unit Operations Laboratory 0 Schematics of the handleaf and continuous rotary lter operations are available on the Continuous Filtration Operation web page Possible Objectives Several tasks that have been the basis of previous projects include Determine effects of lter Wheel rotation speed on key performance indicators such as cake moisture content ltrate rate or lter cake production Determine effects of pressure drop ie vacuum pressure on key performance indicators such as cake moisture content ltrate rate or lter cake production Determine effects of agitator speed on key performance indicators such as cake moisture content ltrate rate or lter cake production Compare predictions of continuous ltration operations based on single leaf lter experiments With the actual results obtained from continuous ltration experiments Note that your project may cover more than one of these objectives or additional objectives of your own esign Modi ed 4192007 Kevin M Sapp page 33 Original Document Jullie Lawson 2007


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