Analysis and Removal of Organochlorine Salts in Crude Oil
Aiming at the problem of excessive salt content in crude oil from a refinery after electrodesalting,the crude oil samples were cut by distillation to analyze the organochlorine and inorganic chlorine contents in each distillate section,and the morphology of chlorine-containing compounds in diesel fraction;the chloride containing compounds soluble in water and the polar nitrogen-containing compounds in reverse extraction phase were analyzed by GC-MS and GC-NCD,based on which the main component of the chlorine-containing compound in the diesel fraction is determined as quinoline hydrochloride,and inferred as the refractory chlorine-containing salt in crude oil.By adding quinoline hydrochloride to crude oil for distillation cutting experiment and desalting experiment,it is confirmed that quinoline hydrochloride can enter the diesel fraction and lead to the increase of salt content in the desalting oil.Desalting agent C was prepared using organic amine compounds,and desalting experiments were carried out on the actual crude oil.The results show that when applying novel desalting agent C with dosage above 50 mg/kg,the total chlorine mass fraction and salt mass fraction of the crude oil decreased from 18 mg/kg and 10 mgNaCl/kg to less than 7.9 mg/kg and 3.1 mgNaCl/kg,respectively.
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