用电导率法研究石油中沥青质沉积问题

介绍了检测石油中沥青沉积的电导率方法，考察了加溶剂（正庚烷和甲苯）过程中共体系电导率的变化规律。结果表明，随着溶剂的加入，两种溶剂体系的电导率均呈先升降的趋势，在电导率变化的一阶导数曲线上，正庚烷体系出现一最高点，该点对此不的沥青质沉积起始点，而一般情况下甲苯体系下出现此点，各原油的沥青质沉积起始点明显其相应的减压渣油，表明渣油体系比原油体系更稳定。

STUDY ON DEPOSITION OF ASPHALTENE BY ELECTRICAL CONDUCTIVITY METHOD

The electrical conductivity method was used to determine the onset of asphaltene deposition of crudes and vacuum residues.It was found that,with the addition of solvent,the electrical conductivity of the system raises at first and then falls.For the system with addition of n heptane,a maximum can be found on the curve of its first derivative and defined as the onset of asphaltene deposition.For the system with toluene,there is no such maximum in most cases.The onset of crude oil was found to be more earlier than its residue,this indicates that crude oil is less stable than its residue.