Equipment for the simulated distillation by means of gas chromatography with non vaporizing direct injection

A chromatographic analysis apparatus for developing a simulated distillation curve for high-boiling-point and high-molecular-weight petroleum product samples comprising:

• (a) a capillary column having an inner diameter ranging between 0.2 and 0.6 mm and a length ranging between 1 and 10 m and including a first end and a second end;
• (b) a nonvaporizing direct cold on-column injector associated with said first end of said capillary column for injecting said petroleum sample into said column and including temperature control means for preventing vaporization of said sample at said first end of said capillary column during said injecting of said petroleum sample;
• (c) a thin-layer stationary phase in said column in a thickness lower than or equal to 0.2 .mu.m;
• (d) an oven wherein said column is housed, said oven being programmable to reach temperatures over 400.degree. C., with a programmable rate of increase equal to at least 5.degree. C. per minute;
• and
• (e) a flame ionization detector associated with said second end of said capillary column.