Abstract: Topped oil of CCR unit has been used as feedstock and used the once through process，do not set up the isopentane and the stabilize column, has been adopted in the 0.2Mt/a C5/C6 alkanes isomerization unit.Through debutanizer stabilized in the CCR unit as the blending component of gasoline.Analysis of the parameters in the first two cycles showed that the NNI-1 catalyst has good performance, higher activity & stability and the requirements of production have been met. RON greater than 78，the rates of C5 andC6isomerization are over 60% and 80% respectively. C6 selectivity is about 15% ，reached the technical requirements.The third cycle running data indicated that increasing the reaction temperature has not been able to overcome the reduction of catalyst activity, RON of the feedstock has been increased by 2-3 units and the rates of C5 andC6isomerization are about 50% and 70% respectively. C6 selectivity is low10% .Therefore recommend propose of a long-term running.

Key words: NNI-1 catalyst, continuous catalytic reforming, C5/C6 alkanes, isomerization, long term operation