Ethylbenzene is manufactured by alkylation of benzene with ethylene. The reaction products are separated in a series of distillation columns. Ethylbenzene is obtained as the distillate from the last column (called the ethylbenzene column). In a 70 ton per day ethylbenzene plant, the final product leaves the overhead condenser at 135°C. This is required to be cooled to 40°C before pumping it to the storage tank. Cooling water is available at 30°C for cooling. Please provide a proposal for the design of a multi-pass counter-current Shell & Tube Heat Exchanger (Figure-1) that fulfils the specifications in Section 3 (Process Data) and includes the following items:
Item 1: Do energy balance and find heat duty (Q) and water flow rate
Item?: First start trial with 1-1 pass counter current exchanger and do LMTD calculation and find out area, assuming overall heat transfer coefficient based on outside area, Udc,
Item 3: Select tube BWG (i.d, o.d and length) from available market and number of tubes required and linear velocity of water (a velocity above 1 m/s should be maintained).Do selection of tube side and shell side fluid with proper justification
Akili Mingi owns a house at Muthaiga in Nairobi valued at Sh. 20 million. He insured it against fire with Linda Mali Insurance Co. Ltd and Pokea Insurance Co. Ltd for Sh.15 million and Sh. 10 million respectively. He also insured his household goods against burglary with Lipa Insurance Co. Ltd. for Sh. 5 million. One night while he was away, burglas broke into the house, stole all household goods and set the house on fire completely destroying it. Akili Mingi claims the sum assured from the three insurance companies. Advise them.
February 8, 2016
9:42 am
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