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Unformatted text preview: CHEE 2331 Chemical Processes Chemical Processes Non Non reaction Material reaction Material Balances Balances Chapter 4, pages 83 Chapter 4, pages 83 125 125 epartment of Chemical and epartment of Chemical and Biomolecular Biomolecular Engineering Engineering Types of processes (1) Batch initial final fill process empty no material crosses the boundary while the process is in operation process boundary Types of processes (2) Semibatch material crosses the boundary in or out but not both A B B A+B A+B Types of processes (3) Continuous inlet outlet material crosses the boundary in and out Two types: (1) Steady state no change in the properties of the stream or process with time (2) Transient properties of inlet, outlet and/or process change with time General balance equation input + generation = output + consumption + accumulation nters into the process generated within the process by a chemical reaction emerges from the process consumed within the process by a chemical reaction accumulates within the process General balance equation input + generation = output + consumption + accumulation May be expressed in: amounts for a certain period or flow rates in terms of: mass moles, or atoms i.e. m, n or m, n . . General balance equation input + generation = output + consumption + accumulation . May be written for: total amount/flow m, n, or m, n component amount/flow m A , n A , m B , n B , etc . . . but the equations are not independent i.e. if there are n components, you can use n1 component + the total equations or n component equations General balance equation input + generation = output + consumption + accumulation Write the balance equation for the following processes: (1) Water heating in a closed kettle (2) Water boiling in an open kettle (3) Ice freezing in an ice tray (4) A bathtub filling up Batch: initial = final Semibatch: 0 = output + accumulation i.e. accumulation = output (loss) Batch: initial = final Semibatch: input = accumulation General balance equation input + generation = output + consumption + accumulation Write the balance equation for the following processes: (1) Water heating in a kettle (2) Water boiling in an open kettle...
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 Spring '08
 ALIM

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