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After comparing the operating status of other catalytic reforming units and evaluation of the side-cut stream tests,the refinery investigated the influence of the feedstock property,clay types,and operating regime of the clay tower and catalytic reforming unit on the service life of the clay.Test results had revealed that the low potential aromatic content of the reformer feed and high operating severity were the critical causes leading to high bromine number of the C8+ aromatics feed for the PX unit and the shortened service life of clay.This article also puts forward the corresponding remedial measures.