Apparatus and process for purification of aromatic carboxylic acid

摘要

A reaction vessel for the purification of crude aromatic carboxylic acid comprising; a bed of hydrogenation catalyst having a vapour space located above said hydrogenation catalyst bed; a packed bed and a holdup section located within the vapour space and spaced above said catalyst bed; means for introducing crude aromatic carboxylic acid and means for introducing hydrogen to the reaction vessel at respective locations such that in use the crude carboxylic acid contact the hydrogen in the packed bed; and means for removing purified aromatic carboxylic acid.