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Lecture 11 9-16-11 - Recycle Stream is a term denoting a...

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1 Chapter 4: Material Balances Multiple-Unit Processes Recycle, Bypass, Purge Streams Exam #1(Closed Book) Wednesday, September 21, 2011 7:00 - 9:00 p.m. PHSC Room 108 Review Session for Exam #1 Monday, September 19, 2011 6:00 - 8:00 p.m. SEC N202A Recycle Stream – is a term denoting a process stream that returns material from downstream of a process unit back to the process unit (or to a unit upstream of the unit). Separator Process Mixer Feed Product Recycle Recycle is an extremely important feature in many chemical processes: - recover “lost” product from waste streams - in chemical reactions, recover unused reactants and feed them back to the reactor. Bypass Stream – one that skips one or more stages of the process and goes directly to another downstream stage. Separator Process Mixer Feed Product Bypass A bypass stream is often used to control the composition of a final exit stream from a unit by mixing the bypass stream and the unit exit stream in suitable proportions to obtain the desired final composition. Purge Stream – a stream bled off to remove an accumulation of inerts or unwanted material that might otherwise build up in the recycle stream. Separator Process Mixer Feed Product Recycle Purge A distillation column separates 10,000 lb/hr of a 50% benzene – 50% toluene mixture. The product from the condenser at the top
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