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Unformatted text preview: CHBE 241 Material and Energy Balances Department of Chemical and Biological Engineering The University of British Columbia Assignment #4 Due: Thursday, 2 November 2006, 4:30pm CHBE Main Office 1. A liquid solution containing compound X is pumped into an empty feed tank. The cylindrical feed tank is 1 m in diameter and 3 m high. The solution (density 1000 kg/m 3 , 0.1 kg X/kg solution) is pumped in at a rate of 40 kg/min. At a point 1 m up the tank wall, a corroded spot gives way, and a leak develops. The leak rate increases as the tank fills, with the rate increasing as the square root of the height of the liquid above the leak: ˙ m leak ( kg/min ) = 4 radicalbig liquid height in tank- 1 How much compound X has leaked out 40 minutes after the start of the tank filling process? 2. As part of the process of producing sugar crystals from sugar cane, raw sugar cane juice is sent to a series of evaporators to remove water. The sugar cane juice, which is 85 wt% water, is fed to the first evaporator at 10,000 lb/h. The concentrated juice out of the last evaporator isis fed to the first evaporator at 10,000 lb/h....
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- Fall '08
- ethylene oxide, Acetic anhydride, sugar cane juice, O Ethylene, cylindrical feed tank