Kinetic study of 1 - butanol dehydration to 1 di - n - butyl ether over Amberlyst 70
نویسندگان
چکیده
8 Kinetics of the catalytic dehydration of 1-butanol to di-n-butyl ether (DNBE) over 9 Amberlyst-70 was investigated. Experiments were performed in liquid phase at 4 MPa and 10 413-463 K. Three elementary reaction mechanisms were considered: a Langmuir‐Hinselwood‐ 11 Hougen‐Watson (LHHW) formulation; an Eley-Rideal (ER) formulation in which DNBE 12 remains adsorbed; an ER formulation in which water remains adsorbed. 13 Two kinetic models explain satisfactorily the dehydration of 1-butanol to DNBE: a LHHW 14 formalism in which the surface reaction between two adjacent adsorbed molecules of 1-butanol 15 is the rate limiting step (RLS) and where the adsorption of water is negligible, and a mechanism 16 in which the RLS is the desorption of water being the adsorption of DNBE negligible. In both 17 models the strong inhibiting effect of water was successfully taken into account by means of a 18 correction factor derived from a Freundlich adsorption isotherm. Both models present similar 19 values of apparent activation energies (122±2 kJ/mol). 20 Topical area: Reaction Engineering, Kinetics and Catalysis 21
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