assignment # 3

assignment # 3 - CHBE 241 Material and Energy Balances...

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CHBE 241 Material and Energy Balances Department of Chemical and Biological Engineering The University of British Columbia Assignment #3 Due: Friday, 20 October 2006, 4:30pm CHBE Main Office 1. Coffee beans contain components that are soluble in water and others that are not. Instant coffee is produced by dissolving the soluble portion in boiling water (i.e., by making coffee) in large percolators, then feeding coffee to a spray dryer in which the water is evaporated, leaving the soluble coffee as a dry powder. The insoluble portion of the coffee beans (the spent grounds) passes through several drying operations, and the dried grounds are either burned or used as landfill. The solution removed from the grounds in the first stage of the drying operation is fed to the spray dryer to join effluent from the percolators. A block flow diagram of the process is shown in Figure 1. The symbols S and I denote the soluble and insoluble components of the coffee beans, W denotes water, and C is a solution containing 35 wt% S and 65 wt% W. (a) Complete a DOF analysis for this process (assume a steady-state operation). Present
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assignment # 3 - CHBE 241 Material and Energy Balances...

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