基于特性黏度法计算沥青质胶团直径和溶剂化效应——分散体系活化状态表征

发布时间：2019-02-27 08:49

【摘要】：在委内瑞拉常压渣油中添加不同比例十八醇,考察十八醇对强化减压蒸馏效果的影响。结果表明,十八醇具有良好强化效果,最大蜡油净增收率为4.01%。测定渣油(沥青质)-甲苯溶液的黏度,根据Einstein黏度定律和Pals-Rhodes方程,计算得到了沥青质胶团直径D和溶剂化参数K,结果表明,特性黏度法测得的沥青质尺寸为沥青质胶核外吸附-溶剂化层的直径,其数值受溶剂化效应的影响,测定渣油-甲苯溶液黏度可以表征渣油体系中沥青质胶团尺寸。对于添加了十八醇的渣油体系,其沥青质胶团直径减小、溶剂化效应降低,变化趋势与减压蜡油净增收率有良好的对应关系,可以采用特性黏度法计算沥青质胶团直径和溶剂化效应,来预测石油分散体系的活化状态。
[Abstract]:The effect of octadecanol on the enhancement of vacuum distillation was investigated by adding octadecanol in Venezuela atmospheric residue. The results showed that octadecanol had good strengthening effect and the maximum net yield of wax oil was 4.01%. The viscosity of residual oil (asphaltene)-toluene solution was measured. According to the Einstein viscosity law and Pals-Rhodes equation, the diameter D of asphaltene micelle and the solvation parameter K were calculated. The results show that the diameter of asphaltene micelle D and solvation parameter K are obtained. The asphaltene size measured by intrinsic viscosity method is the diameter of the adsorption-solvent layer outside the core of asphalt adhesive, and its value is affected by the solvation effect. The asphaltene micelle size in residual oil system can be characterized by determining the viscosity of residual oil-toluene solution. For the residual oil system with octadecanol addition, the asphaltene micelle diameter decreases and the solvation effect decreases, and the trend of change has a good correspondence with the net increase rate of vacuum wax oil. The intrinsic viscosity method can be used to calculate the diameter of asphaltene micelles and the solvation effect to predict the activation state of petroleum dispersion system.
【作者单位】：中国石油大学(华东)重质油国家重点实验室;
【分类号】：TE621

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