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Material balances_0819

Material balances_0819 - Raw materials in Unit operations...

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M p M f Raw materials in Unit operations Stored materials Products out Waste products M s M w Material Balances Underlying principle: Law of conservation of mass o Mass/matter can not be created or destroyed Basic equation: Input=output +accumulation-depletion (for a system boundary) For steady state condition: Diagram: Mass in = mass out + mass stored o Raw materials = products + wastes + Stored materials M f =M p +M w +M s Steady state: M f =M p +M w The law of conservation of mass also applies to each component o Moisture; o Solids; o Lipid; o Protein… Steady state: X: concentration 7 steps to solve a mass balance problem: 1. Collect all known data 2. Draw a block diagram showing all streams. ID each stream and draw system boundry; 3. Write all available data on the block diagram: mass flows (e.g. M f =50 Kg/min), and/or composition data (e.g. X f =0.30) 4. 5. Write overall mass balance equation 6. Write component balances a. Multi-component: use different symbol for each component (e.g. X, Y, D, W) 7. Solve equations.
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