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# pset04 - 10.37 Problem Set 4 Due March 7 2007 Problem 1...

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10.37 Problem Set 4 Due March 7, 2007 Problem 1: [email protected] is working to convert the waste cooking oils from local dining halls and restaurants into diesel fuel to run the MIT shuttle buses. Waste cooking oils can be converted to biodiesel in several ways. One way is by gas- phase pyrolysis: (RC(O)OCH 2 ) 3 Æ (RCH 2 ) 3 + 3 CO 2 This can be modeled as first-order irreversible reaction with a measured k=5x10 -3 min -1 at 150 C and a measured Ea=85 kJ/mole. Pure cooking oil is injected into a hot (T=227 C) reactor at a rate of 2.5 mole/min. At this temperature all the species are in the vapor phase. The steady-state pressure in the reactor is 10 atm. (a) If the reactor is a CSTR, what reactor volume is required to achieve 90% conversion? (b) If the reactor is a PFR and the pressure drop is negligible, what reactor volume is required to achieve 90% conversion? (c) If you had a PFR half the volume you computed in part (b), and then fed its output into a CSTR half the volume you computed in part (a), what would the conversion be?

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• Fall '04
• ClarkColton
• Massachusetts Institute of Technology, Cooking oil, Batch reactor, reactor volume, 10.37 Chemical and Biological Reaction Engineering

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pset04 - 10.37 Problem Set 4 Due March 7 2007 Problem 1...

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