Abstract:

A detection method of inorganic chlorine and total chlorine content in crude oil was established. The contents of inorganic chlorine and total chlorine in crude oil were determined by the method of chloride ion selective electrode, with the method of high shear emulsification and oxygen bomb combustion. The results show that the method of chloride ion selective electrode can used for the detection of inorganic chlorine and total chlorine content in crude oil, with the linear equation of E=-17.11+54.37lgc, the correlation coefficient, R, of 0.9999， the linear range from 6.9×10-6 to 1 mol/L, and the lower limit of 6.9×10-6 mol/L. The conditions of inorganic chlorine extraction to water phase were as follows: 11000 r/min high shear dispersion 4 min , 1000 times extraction ratio of 100 mg/L NaOH solution and crude oil, extraction temperature of 80 ℃. The condition of oxygen bomb combustion of crude oil was combustion under 2 MPa oxygen pressure, and then absorption 30 min with 0.5 mol/L Na2CO3 solution. The recovery of inorganic chlorine and total chlorine was from 94% to 102%. The method was fast and accurate to the detection of inorganic chlorine, chlorine and total chlorine in the oil field.

Key words: total chlorine content, crude oil, high shear emulsification and dispersion, oxygen bomb combustion, chloride ion selective electrode