Keywords
crude oil
2
4-trimethylpentane
MgSO4
reaction kinetics.
How to Cite
Abstract
Some organic sulfur compounds (OSCs) in crude oil may be derived from thermochemical interactions between petroleum and sulfates in deep buried sedimentary basins. In the present study, experiments on the system of 2, 2, 4-trimethylpentane–MgSO4–H2O were operated at elevated temperatures and elevated pressures. Properties of the products were characterized and the reaction kinetics was tentatively investigated. The results demonstrated that the oxidation of 2, 2, 4-trimethylpentane by MgSO4 occurs above 425 °C to produce a series of organic sulfur compounds, including mercaptans, sulfoethers and thiophenes. The calculated activation energy of the reaction between 2, 2, 4-trimethylpentane and MgSO4 is 50.236 kJ/mol.
References
Ken EP, Martin GF. Applications of petroleum geochemistry to exploration and reservoir management. Org Geochem 2002; 33(1): 5-36. http://dx.doi.org/10.1016/S0146-6380(01)00125-5
Cai CF, Worden RH, Bottrell SH, Wang LS, Yang CC. Thermochemical sulphate reduction and the generation of hydrogen sulphide and thiols (mercaptans) in Triassic carbonate reservoirs from the Sichuan Basin China. Chem Geol 2003; 202(1-2): 39-57. http://dx.doi.org/10.1016/S0009-2541(03)00209-2
Worden RH, Smalley PC, Barclays SA. H2S and diagenetic pyrite in North Sea sandstones: due to TSR or organic sulphur compound cracking? J Geochem Explor 2003; 78- 79: 487-491. http://dx.doi.org/10.1016/S0375-6742(03)00072-4
Pan CC, Yu LP, Liu JZ, Fu JM. Chemical and carbon isotopic fractionations of gaseous hydrocarbons during abiogenic oxidation. Earth Planet Sci Lett 2006; 246(1-2): 70-89. http://dx.doi.org/10.1016/j.epsl.2006.04.013
Amrani A, Zhang TW, Ma Q, Ellis GS, Tang YC. The role of labile sulfur compounds in thermal sulfate reduction. Geochim Cosmochim Acta 2008; 72(12): 2960-2972. http://dx.doi.org/10.1016/j.gca.2008.03.022
Chen TS, He Q, Lu H, Peng PA, Liu JZ. Thermal simulation experiments of saturated hydrocarbons with calcium sulfate and element sulfur: implications on origin of H2S. Sci China Ser D: Earth Sci 2009; 52(10): 1550-1558. http://dx.doi.org/10.1007/s11430-009-0126-8
Lu H, Chen TS, Liu JZ, Peng PA, Lu ZH, Ma QL. Yields of H2S and gaseous hydrocarbons in gold tube experiments simulating thermochemical sulfate reduction reactions between MgSO4 and petroleum fractions. Org Geochem 2010; 41(11): 1189-1197. http://dx.doi.org/10.1016/j.orggeochem.2010.08.002
Lu H, Greenwood P, Chen TS, Liu JZ, Peng PA. The role of metal sulfates in thermochemical sulfate reduction (TSR) of hydrocarbons: Insight from the yields and stable carbon isotopes of gas products. Org Geochem 2011; 42(6): 700- 706. http://dx.doi.org/10.1016/j.orggeochem.2011.03.011
Lu H, Greenwood P, Chen TS, Liu JZ, Peng PA. The separate production of H2S from the thermal reaction of hydrocarbons with magnesium sulfate and sulfur: Implications for thermal sulfate reduction. Appl Geochem 2012; 27(1): 96-105. http://dx.doi.org/10.1016/j.apgeochem.2011.09.007
Xiao QL, Sun YG, Chai PX. Experimental study of the effects of thermochemical sulfate reduction on low molecular weight hydrocarbons in confined systems and its geochemical implications. Org Geochem 2011; 42(11): 1375-1393. http://dx.doi.org/10.1016/j.orggeochem.2011.08.014
Zhang TW, Ellis GS, Wang KS, Walters CC, Kelemen SR, Gillaizeau B, et al. Effect of hydrocarbon type on thermochemical sulfate reduction. Org Geochem 2007; 3(6): 897-910. http://dx.doi.org/10.1016/j.orggeochem.2007.02.004
Zhang TW, Amrani A, Ellis GS, Ma QS, Tang YC. Experimental investigation on thermochemical sulfate reduction by H2S initiation. Geochim Cosmochim Acta 2008; 72(14): 3518-3530. http://dx.doi.org/10.1016/j.gca.2008.04.036
Zhang TW, Ellis GS, Walters CC, Kelemen SR, Wang KS, Tang YC. Geochemical signatures of thermochemical sulfate reduction in controlled hydrous pyrolysis experiments. Org Geochem 2008; 39(3): 308-328. http://dx.doi.org/10.1016/j.orggeochem.2007.12.007
Zhang TW, Ellis GS, Ma QS, Amrani A, Tang YC. Kinetics of uncatalyzed thermochemical sulfate reduction by sulfur-free paraffin. Geochimica Cosmochimica Acta 2012; 96(1): 1-17.
Ding KL, Li SY, Yue CT, Zhong NN. A simulation on the formation of organic sulfur compounds in petroleum from thermochemical sulfate reduction. J Fuel Chem Tech 2008; 36(1): 48-54. http://dx.doi.org/10.1016/S1872-5813(08)60011-0
Ding KL, Li SY, Yue CT. New Insights into the Origin of OSCS in Petroleum: A Chemical and Thermodynamic Analysis. Petro Sci Tech 2011; 29(11): 1104-1112. http://dx.doi.org/10.1080/10916460903530481
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Copyright (c) 2015 Kangle Ding, Dongwei Gao, Yue Luo, Xiuyin Xie, Huan Yang