摘要
将沙特轻质原油的减压渣油在395℃临氮条件下进行热反应,利用在线取样装置得到不同热反应时间的样品,借助小角X射线散射(SAXS)技术,测定了各液相残渣油中沥青质聚集体尺寸。结果表明,热反应生焦诱导期的初期沥青质聚集体的尺寸逐渐减小,为29～21 nm;在生焦诱导期后期,其尺寸急剧增大,在热反应进行到150 min时达到43 nm;达到生焦诱导期后,沥青质聚集体尺寸变化较小,在46～42 nm变化。在渣油热反应过程中沥青质聚集体的尺寸受沥青质热裂解、沥青质解缔和缔合等过程的共同影响,与沥青质含量无明显关系。
Vacuum residue from Saudi Arabia light crude oil （ALVR） was thermally reacted at 395 ℃ under the atmosphere of nitrogen. Thermal reaction samples were obtained by online sampling device at different reaction times, and the asphaltene aggregate size was determined The aggregate size of asphaltene decreases from 29 -21 by small-angle X-ray scattering （SAXS） measurements. nm in the initial stage of coke induction period; during later stage of coke induction period, the asphaltene aggregate size increases rapidly and reaches to 43 nm when thermal reaction time reaches to 150 min. After the stage of coke induction period, the asphaltene aggregate size changes little and is in the range of 46 - 42 nm. In the thermal reaction process of residue, the aggregate size of asphaltene is jointly affected by the thermal cracking and association-disassociation of asphaltene, but does not show obvious relationship with asphaltene content.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2013年第1期46-52,共7页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(20776160)
中石油重大科技专项专题(固定床渣油加氢处理催化剂研究开发)
中国石油大学(华东)"青年教师拔尖人才建设工程"基金
重质油国家重点实验室开放课题
关键词
减压渣油
热反应
生焦率
沥青质聚集体尺寸
vacuum residue
thermal reaction
coke ratio
asphaltene aggregate size
