Abstract: The combination process of continuous reforming-C5/C6 isomerization was adopted in Sinopec Tahe Petrochemical Company with hydrofined naphtha as raw material. By optimizing plate number of the prefractionator, the separation accuracy was improved. The effluents at top part and bottom part of the fractionators could meet the requirements of the C5/C6 isomerization catalyst and continuous reforming catalyst, respectively. The combined process can produce reforming gasoline with RON 100 and benzene content less than 0.91% and C5/C6 gasoline with RON ≥85 without benzene extraction unit. The industrial results showed that Controlling benzene precursor in feed and RON of reforming gasoline of 100.8, the benzene content is 0.5%; by C5/C6 isomerization at low temperature-dehexane tower combined process, the RON of isomerate is up to 85; while the combined process of continuous reformer - C5/C6 isomerization can make the content of benzene in the factory gasoline as low as 0.24%, much lower than the requirements of China V standard gasoline.

Key words: CCR, paraffin isomerization, combined technology, benzene reduction technology, clean gasoline