09-17-10 - Recycle and Bypass In a chemical reaction the...

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Recycle and Bypass In a chemical reaction, the entire amount of reactant fed is ________________________ _________________________ Reactants are often a major contributor to the __________________________ If we can ________________________ to the reactor, we can save _________ By separating pure product and recycling unreacted feed, a process ________________ _____________________
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Chemical process involving reaction, separation, and recycle Several ____________________________ Feed to reactor is a mixture of recycle and fresh feed There is expense in _________________________________________ There is no accumulation of mass – note input and output flow rates
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Example Fresh air containing 4.00 mole% water vapor is to be cooled and dehumidified to a water content of 1.70 mole% H20. A stream of fresh air is combined within a recycle stream of previously dehumidified air and passed through the cooler. The blended stream entering the unit contains 2.30 mole% H20. In the air conditioner, some of the water in the feed stream is condensed and removed as liquid. A fraction of the dehumidified air leaving the cooler is recycled and the remainder is delivered to a room. Taking 100 moles of dehumidified air delivered to the room as a basis of calculation, calculate the moles of fresh feed, moles of water condensed, and moles of dehumidified air recycled.
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Reasons for Recycling in a Process ________________________ Dilution of a process stream ________________________ Circulation of a working fluid
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Example 4500 kg/h of a solution that is 1/3 K2CrO4 by mass is joined by a recycle stream containing 36.4% K2CrO4, and the combined stream is fed into an evaporator.
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