油砂沥青供氢热裂化改质油的储存稳定性研究

摘要

The storage stability and mechanism of hydrogen donor thermal cracking (HDTC) of oil-sand bitumen was studied under different reaction conditions by investigating the changes in density, kinematic viscosity, stability, asphaltene content and toluene insoluble material content with the prolonging storage time and comparing with the results of visbreaking.The results show that the density, kinematic viscosity, content of asphaltene and toluene insoluble material increase greatly after visbreaking and hydrogen donor thermal cracking as the storage time increases, indicating the stability deterioration of the upgraded oils.Compared to the thermal visbreaking results, the increasing range of above parameters using HDTC is smaller.The spot test level of HDTC upgraded oil is not greater than No.2, which meets the stability requirements of transportation, demonstrating that the storage stability is superior to the conventional visbreaking upgrading oil after long-time storage.The main reasons for stability improvement are hydrogen donor effect and improved stability of resin system.%通过考察油沙沥青减黏裂化和供氢热裂化改质油的密度、黏度、安定性、沥青质含量、甲苯不溶物含量随着储存时间的延长而发生的变化,研究了供氢热裂化改质油的储存稳定性及其内在机制.结果表明:随着储存时间的延长,减黏裂化和供氢热裂化改质油的密度、黏度、安定性、沥青质含量和甲苯不溶物含量均呈现增大的趋势,说明两种改质油的稳定性均随储存时间的延长而变差;在相同条件下,相比于减黏裂化改质油,供氢热裂化改质油的密度、黏度、沥青质含量和甲苯不溶物含量随储存时间延长而增加幅度较小,供氢热裂化改质油的安定性(斑点试验等级)一般不超过2级,满足船运对油品安定性的要求,说明供氢热裂化改质油的储存稳定性优于减黏裂化改质油;供氢热裂化改质油稳定性改善的原因主要为供氢馏分油的供氢作用和体系胶体稳定性的提高.