midterm3 2006 - Chemical Engineering 140 Midterm #3 (200)...

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Chemical Engineering 140 November 20th, 2006 Midterm #3 (200) 1. Production of Maleic Anhydride Figure P18.28 (per the text but with changes !) below gives a process flow diagram for the production of maleic anhydride by the partial oxidation of benzene. Pertinent reactions are listed below. The moles of O 2 fed to the reactor per mole of pure benzene fed to the reactor is 10. Vapor leaves the steam still (shown at the bottom left of the diagram) at 180 o F and saturated with both benzene and water before entering the reactor. All of the maleic acid produced in the reactor is removed with water in the bottom stream from the water scrubber. All of the C 6 H 6 , O 2 , CO 2 , and N 2 leaving the reactor leave in the stream from the top of the water scrubber, saturated with H 2 O. Originally, the benzene contains trace amounts of a nonvolatile contaminant that inhibit the reaction. This contaminant is removed by steam distillation in the steam still. The steam still contains liquid phases of both benzene and water (benzene is completely insoluble in water). The benzene phase is
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midterm3 2006 - Chemical Engineering 140 Midterm #3 (200)...

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