A method and equipment for the simulated distillation by means of gas chromatography with non vaporizing direct injection.

摘要

The invention concerns a method and an equipment for the simulated distillation, by means of gas chromatography, of petroleum products, capable of characterizing also high boiling products, exceeding C55, over 600 C TBP. A chromatograph is used with a capillary column having a length less than or equal to 10 m, containing an immobilized non polar poly- dimethylsilicon gum stationary phase with a film thickness less than or equal to 0.2 µm. The sample is introduced through a non vaporising direct cold on-column injection and the eluted sample is detected by means of a FID detector. The column oven is operated in temperature programming conditions up to temperatures exceeding 400 (up to 430-450 C).