A kinetic study of the sulfonation of 2-naphthol was performed in homogeneous sulfuric acid solutions of concentrations ranging from 91 to 97%. Temperature was in the range 15-25°C. Mono- and disulfonic acids typically represented >90% of the products. A kinetic model for the overall reaction has been proposed. The model parameters, as well as their dependence on temperature and acid concentration, were determined by optimization computer procedures. The activation energy of first and second sulfonation was found to be in the range 19-21 kcal/ mol. The presence of an SO3H group on the naphthalene rings played an activating or a deactivating role on further sulfonation, depending on the case. © 1992 American Chemical Society.
Sulfonation of 2-naphthol by sulfuric acid: Rate measurements and kinetic model / P. Beltrame,G. Bottaccio, P. Carniti, G. Felicioli. - In: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. - ISSN 0888-5885. - 31:3(1992), pp. 787-791.
Sulfonation of 2-naphthol by sulfuric acid: Rate measurements and kinetic model
P. BeltramePrimo
;P. CarnitiPenultimo
;
1992
Abstract
A kinetic study of the sulfonation of 2-naphthol was performed in homogeneous sulfuric acid solutions of concentrations ranging from 91 to 97%. Temperature was in the range 15-25°C. Mono- and disulfonic acids typically represented >90% of the products. A kinetic model for the overall reaction has been proposed. The model parameters, as well as their dependence on temperature and acid concentration, were determined by optimization computer procedures. The activation energy of first and second sulfonation was found to be in the range 19-21 kcal/ mol. The presence of an SO3H group on the naphthalene rings played an activating or a deactivating role on further sulfonation, depending on the case. © 1992 American Chemical Society.
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