Characteristics of Pyrolysis-Oxidation Reactions of Merey Crude Oil in Air and Nitrogen

doi:10.11944/j.issn.1000-0518.2018.12.180029

Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (12): 1470-1477.DOI: 10.11944/j.issn.1000-0518.2018.12.180029

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Characteristics of Pyrolysis-Oxidation Reactions of Merey Crude Oil in Air and Nitrogen

ZHANG Qingxuan^a^*(),LI Jintao^b,ZHANG Meng^c

^aCollege of Science,China University of Petroleum,Qingdao,Shandong 266580,China
^bShandong Institute of Pesticide Science,Ji'nan 250000,China
^cCollege of Science,China University of Petroleum,Beijing 102249,China

Received:2018-01-29 Accepted:2018-05-23 Published:2018-12-05 Online:2018-12-10
Contact: ZHANG Qingxuan
Supported by:
Supported by the Fundamental Research Funds for the Central Universities(No.09CX04030A), the State Key Laboratory of Heavy Oil Processing(No.F0904009-10)

Abstract

Abstract:

Low-temperature oxidation is an important chemical reaction in air injection and in-situ combustion processes for enhanced oil recovery. To further understand the low temperature oxidation mechanism of intricate thermal reactions of crude oil in aerobic environment, the thermal behavior of Merey crude oil was investigated by thermogravimetry/differential thermal analysis(TG/DTA) in air and under nitrogen atmosphere. The results show that the four reaction intervals including gasification, low temperature oxidation, pyrolysis and high temperature oxidation are observed for the thermal process of Merey crude oil in air with a linear heating rate. The overlap of dominant physical and chemical processes in adjacent intervals sophisticates the characteristics of the oil thermal reaction. The invariant final temperature of gasification and low temperature oxidation intervals as well as the elevated final temperature of pyrolysis and high temperature oxidation intervals along with a raised peak temperature of pyrolysis interval are obtained as the heating rate increases. The comparison of TG/DTG experiments in air and under N₂ atmosphere show that an increasing overlap of high temperature oxidation and pyrolysis intervals is observed as the heating rate increases, which is in favor of coke combustion but adverse to the enhanced oil recovery. The isothermal TG/DTA results show that the ratio of mass loss at temperature 300 ℃ decreases with the increase of the heating rate in air, which is not conducive to the gasification of light components of oil. The higher isothermal reaction temperature corresponds to the longer process of gasification and the greater mass loss. The oxidation is not the main reaction for Merey crude oil below 300 ℃.

Key words: low-temperature oxidation, thermogravimetry/differential thermal analysis, crude oil, pyrolysis

ZHANG Qingxuan, LI Jintao, ZHANG Meng. Characteristics of Pyrolysis-Oxidation Reactions of Merey Crude Oil in Air and Nitrogen[J]. Chinese Journal of Applied Chemistry, 2018, 35(12): 1470-1477.

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Characteristics of Pyrolysis-Oxidation Reactions of Merey Crude Oil in Air and Nitrogen

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