Abstract
Vapor phase alkylation of catechol with t-butyl alcohol (TBA) has been studied over HY and dealuminated HY zeolites (obtained by controlled steaming) in the temperature range 120–200 °C. The predominantly formed product over these catalysts is 4- t-butylcatechol (4-TBC) with more than 86% selectivity, the minor products being 3- t-butylcatechol (3-TBC) and 3,5-di- t-butylcatechol (3,5-DTBC). Moderately steam-treated HY zeolites (steamed at 550 and 700 °C) showed marked increase in catechol conversion and 4-TBC yield. The influence of various reaction parameters such as temperature, space velocity and molar ratio of the reactants are discussed.
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