Summary of Test Method
On this method, a crude oil sample between 1 and 30L is weighed, a debutanization process is made to remove gases and then distillation at several pressures (atmospheric, 100,5 and 2mmHg) is performed and fractions are collected as per analysis requirements up to 400°C AET in a column of up to 18 theoretical plates. A reflux of 5:1 is maintained at all times except at lower pressures. Mass and density of each fraction are obtained and based on these data yields are calculated. Finally, TPB curves of mass or volume% vs AET are drawn.