活性剂对轮古常渣Zeta电位的影响

Effects of active additives on Zeta potential of Lungu atmospheric residue

通过ZetaPlus电位仪及90Plus粒度仪考察十二烷基磺酸钠(SDS)、椰子胺(CA)及油酸(OA)对轮古常渣(LGAR)Zeta电位、胶粒粒度以及胶粒间电性斥力位能的影响。结果表明,三种活性剂对沥青质具有解缔作用,能使LGAR四组分分布、胶粒Zeta电位、电量、胶粒粒度和胶粒间电性斥力位能发生明显的变化;随着SDS和CA浓度的增加,胶粒Zeta电位、电量和胶粒间电性斥力位能先增大后减小,胶粒粒度先减小后增大,极值分别在活性剂质量分数为0.7%(SDS)和0.5%(CA)处;随着OA浓度的增加,胶粒Zeta电位、电量和胶粒间电性斥力位能持续增加,胶粒粒度持续减小;渣油沥青质胶粒间电性斥力的大小,是抑制沥青质缔合的一个重要因素。

i The effects of sodium dodecyl sulfonate （ SDS）, coconut amine （ CA）, and oleic acid （OA） on the Zeta potential, quantity of electric charge, granularity, and electric repulsive potential between the colloidal particles of Lungu atmospheric residue（LGAR） were studied with the help of the Plus Zeta potential analyzer and the 90Plus granularity analyzer. It showed that the three kinds of active additives could disaggregate asphaltene, and change the distribution of SARA four fractions, Zeta potential, quantity of electric charge, granularity, and electric repulsive potential between colloidal particles. The Zeta potential, quantity of electric charge and electric repulsive potential between colloidal particles first increased, and then decreased, whereas, the granularity of colloidal particles first decreased and then increased, with an increase in concentration of SDS and CA, and the extremum separately present to the mass fraction of 0.7% （SDS） and 0.5% （CA）. OA can increase the Zeta potential, quantity of electric charge, and electric repulsive potential between colloidal particles, and decrease the granularity of colloidal particles. The magnitude of electric repulsive potential between colloidal particles is one of the main factors that restrain the aggregation of asphaltene.