laboratory assignments

Click here to load reader

Post on 09-Jul-2016

223 views

Category:

Documents

3 download

Embed Size (px)

TRANSCRIPT

CHEMICAL ENGINEERING 4903-2

CHEMICAL ENGINEERING 4903-2FALL SEMESTER 2013 SCHEDULE OF LABORATORY EXPERIMENTS

(Revised 8/20/13)

Project PeriodIFormal ReportIIReportIIReport

Receive Lab Assignment8/289/2611/7

Lab Prelim. Conference Deadline9/310/111/12

Report Due (1:00 PM)9/2611/712/12

Technical Rewrite Due (1:00 PM) if necessaryOne week after receiving instructor graded reportOne week after receiving instructor graded reportNone due

Group I Sean Peterson

Michael Yeh

Matt Houston

Shell & Tube Heat Exchanger-1Extruder-2Stirred Tank Reactor-3

Group II

Wentao Li

Gustavo Vieiralves

Mariana de Castro

Stirred Tank Reactor-1Ultrafiltration/Reverse Osmosis-2Shell and Tube Heat Exchanger-3

Group IIISteve TaylorMitch Bowles

Hyunggu HanDistillation Column-1

Shell & Tube Heat Exchanger-2Liquid Level Control-3

Group IVJames AllenMatt Osmond

Eric WheelwrightFluidized Bed-1

Heat Conduction-2Distillation Column-3

Group VDallon BoydTristalee WilliamsDouble-Pipe Heat Exchanger-1Distillation-2 Fluidized Bed-3

Group VI

Absorption Column-1Liquid Flow Bench-2Double-pipe Heat Exchanger-3

Shell and Tube Heat Exchanger-1

The shell and tube heat exchanger in the laboratory has not been used for several months. Beehive Engineering would like you to measure the fouling resistance in this unit so that it can be used for a new design. To measure the fouling resistance you will need to first determine the overall heat transfer coefficient for the transfer of heat from the jacket to the liquid inside the shell. The wall conduction and inside and outside heat transfer resistances must be determined by predictions so that they can be subtracted from the overall heat transfer coefficient leaving the fouling resistance. In this process, there are errors in experimental measurements and errors in the various predictions which will have an effect on the accuracy of the fouling resistance. For your safety review meeting you will have to establish a protocol for these measurements (including accuracy assessment) and a dimensionless number correlation for the shell side and tube side heat transfer coefficient that is reasonable for this type of equipment. Note, your Reynolds numbers may not be in the fully turbulent range. Also be prepared to discuss the propagation of error in all of the calculations needed for this lab.

For you laboratory report, you should compare your experimental results for the inside and outside heat transfer coefficients with theoretical correlations to generated credibility for using them in determining the fouling resistance. The final report should also clearly report the fouling factor.

Finally using this fouling factor and this shell and tube heat exchanger determine the flow rate for SiH2Cl2 which enters as a vapor at it boiling point at 10 psig and is condensed and cooled to -55 C using Syltherm XLT as the coolant operating from -95C to -60C. seehttp://msdssearch.dow.com/PublishedLiteratureDOWCOM/dh_08a5/0901b803808a5a48.pdf?filepath=heattrans/pdfs/noreg/176-01468.pdf&fromPage=GetDocPlease include this assignment in your report as an appendix but do not cite it in the body of your report.

Vacuum Drying Oven 1

New technologies being investigated to protect a damaged space shuttle during reentry is to first fill the damaged area with a porous polymeric material and then soak it with water. At the temperatures of space the water will freeze in the pores. The worst-case scenario is for a 4 inch2 area, 1-inch deep hole in the shuttles skin. Your question is to determine if during reentry the shuttles skin will be protected by this ice filled repair. For your oral please present the external conditions present at the Shuttles skin during reentry. To help facilitate your investigations the laboratory has a vacuum drying oven that is steam heated. Professor Ring will supply several examples of the open cell porous polymer material to be tested. This material should be well characterized before it is to be used in your experiments.

Develop a series of experimental tests to determine the time required to remove water and ice from the porous structure at different drying conditions. Compare these measurements to predictions using simultaneous heat and mass transfer. Extrapolate these conditions to those of reentry of the space shuttle and predict if the ice filled repair material is adequate for this application. To do this effectively, you will need to simulate the temperature and pressure conditions that the shuttle will experience during reentry and then predict the rates of sublimation and drying that will take place in this patch material during these reentry conditions. Use risk analysis to determine what are the most important parameters that will lead to a successful patch of this type and determine what is the chance of failure of the patch during reentry. Astronauts lives are riding on you work.Please include this assignment in your report as an appendix but do not cite it in the body of your report.Stirred Tank Reactor-1

A client is running his CSTR without baffles and a top feeding location for both reactants. Both of these changes were done at the same time and now his reactor conversion is much too low. His engineer told him that the thermal well and feed tubes would provide sufficient mixing in this reactor so baffles were not needed. He wants to know which change is responsible for the low conversions being reported. The other operating conditions for the reactor are a total reactant flow rate of 100 mL/min, a reactor volume of 1.3 L and a Rushton impeller speed of 10 rpm. The reaction being performed in the reactor is the saponification of ethyl acetate with the reactants being fed at equimolar flow rates.Uniform mixing of reactants is critical to the conversion in a CSTR. You are to develop a series of data and calculations to show the effect of residence time on reactor conversion for presentation to the client. Since the laboratory hoods are not functioning no chemicals with toxic vapors can be used so only residence time distributions and model calculations can be used to prove your point.

Please run a CSTR with and without baffles and with top and bottom feed locations to establish the degree of micro/macro-segregation that is observed as a function of stirring rate (1, 10, 100 rpm) using the residence time distribution as your test case. Start with an unbaffled tank and proceed to add baffles until four are added and do these measurements for top and bottom feed locations. Please determine the residence time distribution for each experimental condition. Compare the residence time distributions and the micro/macro-segregation models given in Chapt 14. of Foglers Elements of Reaction Engineering 2nd edition.The client uses the saponification of ethyl acetate

Et-Ac + NaOH NaAc + Et-OH

for his reaction. The kinetics of this reaction is reported in Hovarka, R.B. and Kendall, ;H.B. "Tubular reactor at low flow rates" CEP56(8),58-62(1960). In equimolar experiments they found this reaction to be second order overall. The kinetics provided by Hovarka and Kendall can be used for prediction purposes.In your final report, use reactor-mixing models to fit the results you have obtained from measurements of the residence time distribution. Use your best mixing model and the reaction kinetics to predict the real reactor conversion and compare it to the ideal CSTR reactor conversion. So that we can show the client we can clearly predict the effects of poor mixing in his CSTR. Clearly identify which of the two changes, removal of baffles and top feeding, is responsible for the low conversion the client is experiencing in his/her saponification reactor.

Please include this assignment in your report as an appendix but do not cite it in the body of your report.

Liquid Flow Bench-1Flow through packed beds are essential for many unit operations including trickle bed reactors used for biological clean-up of phenol from process waters in a Salt Lake City refinery. Phenol at concentrations above 10 ppm is toxic to bacteria in waste water treatment facilities and must be removed before refinery waste water is discharged to the sewer. As a result, waste water is caused to flow through a packed bed bioreactor made of porous sand impregnated and bound with an enzyme from unique strain of bacteria that considers phenol food. The enzyme in the acid form catalyzes the oxidation of phenol rendering it non-toxic. The kinetics of this oxidation reaction follows the Michaelis Menton kinetic relation

-Rate = Vmax S/(Km+S)

where S is the concentration of the substrate, phenol, and Vmax =1 x10-6 mole/(cm2 hr) and Km= 12 ppm measured for the enzyme impregnated sand particles. Your job is to determine from the properties of the flow of water in the laboratory sand bed (i.e. friction factor vs Reynolds number) so that this sand bed can be used in an appropriate waste water treatment plant to treat 50 gal/hr of water loaded with 500 ppm phenol so that it can be rendered safe to send to the Salt Lake City sewer. Size (diameter and height) the sand bed reactor needed for this application.Please include this assignment in your report as an appendix but do not cite it in the body of your report.

Bubble-cap Distillation Column 1

Please operate the laboratory distillation column in two modes: 1) at total reflux and 2) when top and bottom products are being taken with a recycle ratio of approximately twice the minimum recycle ratio. Determine the overall and stage-by-stage efficiency of the laboratory distillation column under these two modes of operation. Please

View more