(257ao) Insight to the Origins of Corrosive Component HCl in Crude Oil Distillation Process

This work investigated the distribution and identification of chlorides in distillates from YS crude oil on the basis of true boiling point (TBP) distillation technology, and completed the thermodynamic analyses on hydrolysis of chlorides in crude oil distillation process. YS crude oil was categorized into low-acid light crude oil with total chlorine content of 10 mg/L. A total of 21 distillates and one residual oil (>500 °C) were obtained by TBP distillation. The organochlorine compounds were observed as predominant one among all distillates instead of inorganic chlorine compounds. The organochlorine content in distillates gradually decreased with increasing boiling range from IBP to 260 °C. Meanwhile, 17 kind of chlorides were identified from the distillates (<300 °C) via GC-ECD and these chlorides coexisted in almost all distillates (<300 °C). On the specified concentration of steam and products of chloride hydrolysis, the hydrolytic possibility of main inorganic and organic chlorides in crude oil was estimated. Furthermore, the origin of the corrosive components HCl was revealed in crude oil distillation process.