DIANA CURSARU, ULRICH KUNZ<br>Kinetic Investigation on Direct Hydration of n-butene in a Multiphase Reactor

DIANA CURSARU, ULRICH KUNZ
Kinetic Investigation on Direct Hydration of n-butene in a Multiphase Reactor

Abstract:

The microkinetics for the liquid phases synthesis of secondary butanol (SBA) from water and n-butenes using a macroporous sulfonic acid ion exchange resin as catalyst (Amberlyst DT from Rohm & Haas) was experimentally measured in a high pressure reactor (an improved version of the Carberry reactor) that enables the visualization of the phases that occur during the hydration reaction. A first set of experiments was performed in order to determine the reaction conditions where the surface reaction is the rate limiting step and where there are no influences of either external or internal mass transfer processes. Following these experiments we concluded that kinetic studies should be conducted at 800 rotation per minute stirring speed, at a temperature between 117 and 130°C on catalyst particle dimensions below 0.71 mm, at 60 bar pressure. Under these reaction conditions the surface reaction has been found to be the rate limiting step. The experimental results are well described by a four-parameter model based on Langmuir-Hinshelwood rate expression, in terms of liquid phase fugacities calculated from the predictive Soave-Redlich-Kwong (PSRK) equation of state with UNIQUAC liquid-liquid equilibrium. Keywords: secondary butanol synthesis, microkinetic model, multiphase reactor

Issue: 2010, Volume 61, Issue 12

Pages:

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