[The analysis of C4 and C5 olefins in cracking gasoline].

The paper described the analytical method of butenes and pentenes in cracking gasoline with a boiling point range from initial to 210 degrees C. Beside the C3 (propane + protene) and n, i-C4 = (n-butene + i-butene) combine peaks, all C2-C5 components in the sample were separated on the OV-1 column. The proportion of the combined peaks was determined on the Al2O3 column. The quantitative results were calculated on the data determined from the above one-column analytical systems with a relative standard deviation < 8%. Comparing with the ASTM D2427-87, the simple operation, easy application, good repetition and all component results were characteristic of the method.