Abstract: The relationship between CA value, PCA and contents of eight kinds of specific aromatics in SZ36-1 vacuum narrow distillate was investigated. Result showed that the distillates (≥480 ℃) have advantages of producing high CA environmental-friendly rubber oils. A new furfural extraction process named gradual fining-separation process was self-developed in which the furfural is injected at upper and lower parts of the tower instead of only at the top position injection. The new process greatly increases the yield of target rubber oils on the premise of the same product quality compared with the traditional technology. The industrial application of the new technology verifies the results of the laboratory research and greatly reduces the production cost of the product.

Key words: environmental friendly rubber oil, solvent extraction, benzopyrene, PCA