Abstract: The conversion rules of benzene, methyl cyclopentane and cyclohexane components over an industrial mid-temperature isomerization catalyst were studied by a laboratory evaluation device. Test results showed that under medium temperature isomerization conditions, benzene in the feed could be converted completely; when reaction temperature was less than 220 ℃, benzene converted to methyl cyclopentane and cyclohexane mainly with little cracking products; with the increase of reaction temperature, products obtained by ring opening and cracking increased. The conversion of methyl cyclopentane increased with the increase of reaction temperature; at low temperature cyclohexane was its main product, with the increase of reaction temperature the cracking products increased significantly. The same with the conversion of cyclohexane, only methyl cyclopentane was the main product from converting cyclohexane at low temperature. Process schemes for benzene removal of feeds with various benzene, methyl cyclopentane and cyclohexane (B+MCP+CH) contents were proposed as follows: for feeds with relatively low (B+MCP+CH) contents, the existing isomerization process scheme could be used to realize the complete conversion of benzene with a little change of product octane number and liquid yield; for feeds with high (B+MCP+CH) contents, the combined process of fractionation and isomerization should be a good choice, by optimizing process conditions product with high (MCP+CH) content and higher octane number could be obtained.

Key words: C5, C6, isomerization catalyst, benzene, methyl cyclopentane, cyclohexane , clean gasoline