基于连续热力学分析的塔河常压渣油戊烷溶剂脱沥青

Pentane Solvent Deasphalting of Tahe Atmospheric Residue Based on Continuous Thermodynamics Analysis

针对塔河原油高金属、高沥青质、高酸值等特点,为避免加工过程中的高温腐蚀问题,将其经常压闪蒸后直接作为溶剂脱沥青工艺的原料进行加工。基于连续热力学分析,建立了溶剂脱沥青过程的相对分子质量分布模型,以所建模型考察了塔河常压闪蒸渣油戊烷溶剂脱沥青过程的操作条件对脱沥青油和脱油沥青的相对分子质量分布和产率的影响,并与中试装置所得结果进行对比,绝对误差小于5%。溶剂脱沥青中试实验的适宜操作条件为压力3.7MPa、温度175℃、剂/油比5.0,此时脱沥青油产率为75.2%,平均相对分子质量440,其性质满足催化裂化装置的进料要求,同时,脱油沥青可以作为沥青混合料添加剂。

Due to high content of metal, asphaltene and high acid value, Tahe atmospheric flashing residue was directly used as the feedstock of solvent deasphalting to avoid the high temperature corrosion in traditional process for Tahe crude oil. Based on continuous thermodynamics analysis, relative molecular mass distribution model for solvent deasphalting was established. The effects of different operating conditions of solvent deasphalting on the relative molecular mass distribution and yield of deasphalting oil and de-oil asphalt were investigated by the model. The absolute error between model calculated value and the medium experimental value was less than 5 %. The suitable conditions of medium solvent deasphalting process were the extraction temperature of 175℃, the extraction pressure of 3.7 MPa and the solvent/residue ratio of 5.0, under which the yield of deasphalted oil was 75.2% with the average relative molecular mass of 440, and its properties met the feed requirement for catalytic cracking unit. Meanwhile, de-oil asphalting can be used as asphalt mixture additive.