Citation: LIU He, CHEN Kun, WANG Zong-xian, GUO Ai-jun. Evaluation of relative hydrogen-donating abilities of different heavy oils during mild thermal conversion by ¹H-NMR[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(10): 1191-1198. shu

Evaluation of relative hydrogen-donating abilities of different heavy oils during mild thermal conversion by ¹H-NMR

1.
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China

Corresponding author: WANG Zong-xian,
Received Date: 25 December 2012
Available Online: 11 February 2013
Fund Project: 中国石油天然气股份有限公司委内瑞拉超重油减黏基础研究项目(2008E-1502/2) (2008E-1502/2)中国石油大学(华东)研究生创新工程(CX-1216)。 (华东)研究生创新工程(CX-1216)

The relative hydrogen-donating abilities of different heavy oils were determined by ¹H-NMR. Three typical heavy residues and the corresponding subfractions were thermally treated with equal weight of chemical accepting probe (i.e. anthracene) at 380℃ for 8 min under the nitrogen pressure of 4MPa; the toluene insoluble yield, gas yield and composition, and the distillation curve of liquid products were determined. The results show that the thermal reaction of samples under the testing conditions is relatively moderate with no apparent structural changes. By comparing the hydrogen distribution of samples with that of residues after reaction, it is proved that the primary reaction during the thermal process can make the hydrogen transfer from oil samples to anthracene. The reduction value of the hydrogen content of H_cβ(chemical shift ranging from 1.4~2.0 in ¹H-NMR spectrum, representing naphthenic hydrogen two positions from the aromatic ring of naphtheno-aromatics) and H_cα(chemical shift ranging from 2.5~4.7 in ¹H-NMR spectrum, representing hydrogen on naphthenic ring adjacent to fused aromatic ring of naphtheno-aromatic) is correlated well to the donated hydrogen content measured by chemical method. Thus it is reasonable to regard H_cβ and H_cα as the main donated hydrogen during mild thermal conversion of heavy oils, and to entatively evaluate the relative hydrogen-donating ability of heavy oil using the two type protons content in ¹H-NMR is acceptable.
- ¹H-NMR,
- donatable hydrogen,
- heavy oils,
- mild thermal conversion,
- hydrogen-donating ability
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沈阳化工大学材料科学与工程学院沈阳 110142

Evaluation of relative hydrogen-donating abilities of different heavy oils during mild thermal conversion by 1H-NMR

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通讯作者: 陈斌, bchen63@163.com

Evaluation of relative hydrogen-donating abilities of different heavy oils during mild thermal conversion by ¹H-NMR