Abstract
4-t-Butyl phenol (4-TBP) was synthesized from diisobutylene (DIB) and phenol (PhOH) using aluminum chloride as catalyst, and this reaction steps were discussed.The conditions of the reaction were as follows: temperature 120°C, DIB/PhOH mole ratio 0.4, reaction time 1hr, and aluminum chloride 5wt% (based on feed PhOH). The yield of 4-TBP was 96.3% (based on feed DIB) and 62% (based on feed PhOH) and other alkyl phenol content was 1.8%.The reaction was consecutive, in which t-octyl-phenol (TOP) was first formed from DIB and PhOH, and then t-butyl phenol (TBP) was produced through the reaction of TOP and PhOH, where the reaction of TOP and PhOH was a rate determining step. The result of the alkylation of PhOH with DIB could be expressed by the 1st order rate equation in terms of DIB concentration, and the activation energy was calculated to be 20.2kcal/mole. In the reaction of TOP and PhOH, the rate was proportional to the 1st order with respect to the concentration of TOP.
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