辽河稠油减渣深度戊烷脱沥青的研究

以戊烷为溶剂,在脱沥青实验装置上对辽河稠油减渣进行梯级分离,得到轻脱油、重脱油和脱油沥青。在温度155℃~170℃、压力为4.0 MPa~7.0 MPa,考察了温度、压力变化对脱沥青油收率及性质的影响。用超临界萃取分馏的实验结果关联了脱沥青油残炭、N元素、Ni元素的脱除率。结果表明,压力升高、温度降低,脱沥青油收率增加,轻、重脱油的残炭值及S、N、Ni、V等元素含量升高,脱沥青油性质变差。在脱沥青油收率最高为74.23%时,Ca、Ni元素的脱除率分别为92.75%、74.50%;残炭的脱除率为62.13%;N、S元素的脱除率分别为40.17%、24.10%。超临界萃取馏分油的杂质脱除率与脱沥青油的杂质脱除率有较好的相关性。

Solvent deep deasphalting of Liaohe heavy oil vacuum residuum

Liaohe heavy oil vacuum residuum was separated into the light de-asphalted oil (LDAO), heavy de-asphalted oil (HDAO) and de-oiled asphalt (DOA) in a continuous de-asphalting device by deasphalting under supercritical conditions with pentane as solvent. The effects of pressure (4.0MPa～7.0MPa) and temperature (155℃～170℃) on the yield and properties of the de-asphalted oil were investigated. The Conradson carbon residue (CCR) and removal rates of N and Ni elements were correlated with that of supercritical fluid extraction fractions (SFEF). With the increase of pressure and the decrease of temperature, the total yield of de asphalted oil (DAO) is increased; meanwhile, the contents of CCR and elements like S, N, Ni and V in LDAO and HDAO are also increased. When the total yield of DAO is 74.23% (the yields of LDAO and HDAO are 57.68% and 16.55%, respectively), the removal rates of Ca, Ni, CCR, N and S are 92.75%, 74.50%, 62.13%, 40.17% and 24.10%, respectively; the removal rates for DAO correlate well with that for the SFEF fractions. The properties of DAO can be correlated with the extent of deasphalting and the properties of Liaohe heavy oil vacuum residuum feed.