The dehydration reaction kinetics of castor oil was investigated with sodium bisulfate‐sodium bisulfite mixture (SB‐SB) or p‐toluenesulfonic acid as catalyst. Reactions were carried out at 210, 220, and 230°C, and a kinetic model was determined for each case. The reactions with SB‐SB catalyst at 210 and 220°C and with p‐toluenesulfonic acid at 210°C followed second‐order kinetics. A first‐order rate equation showed the best fit to the experimental data for the reaction with SB‐SB at 230°C. p‐Toluenesulfonic acid‐catalyzed reactions at 220 and 230°C were also first‐order reactions. Additionally, some mathematical equations were derived between iodine value, refractive index, viscosity, and reaction time.
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F. Seniha Güner (1997) studied this question.
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