Consider the dehydration of isopropyl alcohol (IPA) to yield acetone and hydrogen: This reaction is endothermic, with

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Consider the dehydration of isopropyl alcohol (IPA) to yield acetone and hydrogen:(CH3),CHOH*(CH3),CO+H2 IPA acetone

This reaction is endothermic, with a heat of reaction of 57.2 kJ/mol. The reaction is kinetically controlled and occurs in the vapor phase over a catalyst. The reaction kinetics for this reaction are first order with respect to the concentration of alcohol and can be estimated from the following equation:-Ea RT [K] -TIPA = ko exp  |- R CIPA kmol/m (catalyst)/s

where Ea = 72.38 MJ/kmol, ko = 1.931×105 m3 (gas)/m3 (reactor)/s, and cIPA has units of kmol/m3 (gas).

The feed to the reactor is 87 wt% IPA in water at 240°C and 2 bar. Spherical catalyst particles (5 mm in diameter) are placed in 50 mm ID tubes of length 6 m. The heat transfer coefficient on the tube side of the reactor is limiting. A heat transfer medium (HTM) is available as part of a heating loop that supplies the HTM to the reactor shell at 400°C.

Properties of the heat transfer fluid areCp = 2800J/kg/C, p = 680kg/m, k = 0.078 W/m/K,  0.00012 kg/m/s =

Properties of the process gas areCp,p = 2200 J/kg/C,kp = 0.055 W/m/K,Mp=1.48 X 10-5kg/m/s

Properties of the catalyst areVoidage = 0.45, Peat = 2400 kg/m

1. Determine the conversion of alcohol to acetone assuming that the HTM flows cocurrently with the process gas. Assume that the HTM flows at a rate of 200,000 kg/h, the inlet flowrate to the reactor is 8,000 kg/h of IPA and water, and the reactor has a total of 1600 tubes arranged on a square pitch with the tube centers 75 mm apart.

2. Sketch the temperature concentration profiles in a single reactor tube.

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Related Book For  book-img-for-question

Analysis Synthesis And Design Of Chemical Processes

ISBN: 9780134177403

5th Edition

Authors: Richard Turton, Joseph Shaeiwitz, Debangsu Bhattacharyya, Wallace Whiting

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