Decreasing Br-reactive contaminants in aromatic streams

This invention relates to removing bromine reactive hydrocarbon contaminants in aromatic streams by contacting the stream with an acid active catalyst. The aromatic streams have a negligible diene level before contacting and decreased levels of mono-olefins and dienes after contacting. Dienes may be removed in a pre-treatment step according to the invention. Bromine reactive hydrocarbon contaminants are removed from aromatic streams by first providing an aromatic feedstream having a negligible diene level. The feedstream is contacted with an acid active catalyst composition under conditions sufficient to remove mono-olefins. An aromatic stream may be pretreated to remove dienes by contacting the stream with clay, hydrogenation or hydrotreating catalyst under conditions sufficient to substantially remove dienes but not mono-olefins.