Abstract
Abstract tert -Butylation of diphenylamine (DPA) with different tert -butylation agents isobutylene (IB), tert -butanol (TBA), and C 4 -fraction (C4-IB) in the liquid phase was studied over zeolite catalyst H-BEA (H-BEA CP 814E). This zeolite and acidic clay catalysts Nobelin and Fulcat 22B were compared in tert -butylation of diphenylamine with isobutylene and tert -butanol. The study of the influence of tert -butylation agents in alkylation of DPA over H-BEA showed that isobutylene is the most suitable in tert -butylation of diphenylamine over the particular H-BEA zeolite catalyst in terms of conversion and selectivity to desired products. Comparative study of catalyst type influence on tert -butylation of DPA with TBA and IB employed zeolite catalyst H-BEA and two clay ones Nobelin and Fulcat 22B. The study showed that all catalysts perform well in alkylation of DPA but H-BEA with the highest total acidity is the most active. tert -Butylation of diphenylamine over H-BEA zeolite catalyst and acidic clays appears to be an environmental alternative to other catalysts (e.g. Friedel-Crafts) in industrial preparation of tert -butylated diphenylamines.
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