Gas-producing characteristics of coals containing hydrogen sulfide by the thermochemical sulfate reduction

It is generally considered that the thermochemical sulfate reduction is one of the main origins of high content of hydrogen sulfide (H2S). Thermochemical sulfate reduction simulation experiments at different temperatures ranging from 200?C to 600?C were carried out to study the output of gaseous products, which include CO2, CH4, H2S, and heavy hydrocarbon (C2-6). Thermochemical sulfate reduction can promote the formation of CH4 and H2S, and can preferentially consume heavy hydrocarbons. The CH4 is difficult to participate in the reaction of formation H2S. The concentrations of CO2 and hydrogen are closely related to the evolution characteristics of H2S. The intermediate sulfur-containing products from thermochemical reaction and thermal cracking of coals can promote the progress of thermochemical sulfate reduction and possible formation of H2S.

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Study of thermochemical sulfate reduction of different organic matter: Insight from systematic TSR simulation experiments

Marine and Petroleum Geology ◽

10.1016/j.marpetgeo.2018.11.009 ◽

2019 ◽

Vol 100 ◽

pp. 434-446 ◽

Cited By ~ 2

Author(s):

Heng Zhao ◽

Wenhui Liu ◽

Tenger Borjigin ◽

Jianyong Zhang ◽

Houyong Luo ◽

...

Keyword(s):

Organic Matter ◽

Sulfate Reduction ◽

Simulation Experiments ◽

Thermochemical Sulfate Reduction

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Hydrogen sulfide formation in oil and gas

Canadian Journal of Chemistry ◽

10.1139/cjc-2015-0425 ◽

2016 ◽

Vol 94 (4) ◽

pp. 406-413 ◽

Cited By ~ 23

Author(s):

Robert A. Marriott ◽

Payman Pirzadeh ◽

Juan J. Marrugo-Hernandez ◽

Shaunak Raval

Keyword(s):

Hydrogen Sulfide ◽

Sulfate Reduction ◽

Oil Sands ◽

Oil And Gas ◽

Gas Production ◽

Oil And Gas Production ◽

Ionic Strength Effect ◽

Thermochemical Sulfate Reduction ◽

Fracture Fluid

Hydrogen sulfide (H2S) can be a significant component of oil and gas upstream production, where H2S can be naturally generated in situ from reservoir biomass and from sulfate-containing minerals through microbial sulfate reduction and (or) thermochemical sulfate reduction. On the other hand, the technologies employed in oil and gas production, especially from unconventional resources, also can contribute to generation or delay of appearance of H2S. Steam-assisted gravity drainage and hydraulic fracturing used in production of oil sands and shale oil/gas, respectively, can potentially convert the sulfur content of the petroleum into H2S or contribute excess amounts of H2S during production. A brief overview of the different classes of chemical reactions involved in the in situ generation and release of H2S is provided in this work. Speciation calculations and reaction mechanisms are presented to explain why thermochemical sulfate reduction progresses at faster rates under low pH. New studies regarding the degradation of a hydraulic fracture fluid additive (sodium dodecly sulfate) are reported for T = 200 °C, p = 17 MPa, and high ionic strengths. The absence of an ionic strength effect on the reaction rate suggests that the rate-limiting step involves the reaction of neutral species, such as elemental sulfur. This is not the case with other thermochemical sulfate reduction studies at T > 300 °C. These two different kinetic regimes complicate the goal of extrapolating laboratory results for field-specific models for H2S production.

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Simulation Experiment of TSR Promotes Cracking of Coal Generation H2S

Geofluids ◽

10.1155/2021/6613252 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Qigen Deng ◽

Yinsheng Du ◽

Yanjie Yang ◽

Fajun Zhao

Keyword(s):

Simulation Experiment ◽

Reaction System ◽

Co2 Production ◽

Hydrocarbon Generation ◽

Promoting Effect ◽

Simulation Experiments ◽

Reaction Systems ◽

Gaseous Products ◽

Evolution Characteristics ◽

High Pressure Reaction

Thermochemical sulfate reduction (TSR) is one of the main contributors to the formation of hydrogen sulfide (H2S) in coal seam strata. Four reaction systems (coal, coal+water, coal+water and MgSO4, and coal+water and MgSO4 and AlCl3) were selected and simulated from 250°C to 600°C with eight temperature steps using a high-temperature and high-pressure reaction device, and the evolution characteristics of the gaseous products of hydrocarbons (methane, C2-5) and nonhydrocarbon gases (CO2, H2, and H2S) were studied. Thermal simulation experiments showed that the TSR led to the reduction of heavy hydrocarbons, and the presence of salts accelerated the evolution of hydrocarbons; SO42-, Al3+, and Mg2+ had a certain promoting effect on the TSR, which increased the total amount of alkane gas, H2S, and CO2 production. Improving the salinity of the reaction system can promote the occurrence of TSR, and water plays a key role in hydrocarbon generation evolution and the TSR.

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Simulation experiments on thermochemical sulfate reduction using natural gas

Journal of Fuel Chemistry and Technology ◽

10.1016/s1872-5813(07)60025-5 ◽

2007 ◽

Vol 35 (4) ◽

pp. 401-406 ◽

Cited By ~ 13

Author(s):

Kang-le DING ◽

Shu-yuan LI ◽

Chang-tao YUE ◽

Ning-ning ZHONG

Keyword(s):

Natural Gas ◽

Sulfate Reduction ◽

Simulation Experiments ◽

Thermochemical Sulfate Reduction

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Thermochemical Sulfate Reduction Simulation Experiments on the Formation and Distribution of Organic Sulfur Compounds in the Tuha Crude Oil

Bulletin of the Korean Chemical Society ◽

10.5012/bkcs.2014.35.7.2057 ◽

2014 ◽

Vol 35 (7) ◽

pp. 2057-2064 ◽

Cited By ~ 1

Author(s):

Changtao Yue ◽

Shuyuan Li ◽

He Song

Keyword(s):

Crude Oil ◽

Sulfate Reduction ◽

Sulfur Compounds ◽

Organic Sulfur ◽

Simulation Experiments ◽

Organic Sulfur Compounds ◽

Thermochemical Sulfate Reduction

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Combining experiment and density functional theory to study the mechanism of thermochemical sulfate reduction by hydrogen in supercritical water

Journal of Molecular Liquids ◽

10.1016/j.molliq.2021.115654 ◽

2021 ◽

Vol 330 ◽

pp. 115654 ◽

Cited By ~ 1

Author(s):

Runyu Wang ◽

Libo Lu ◽

Jia Chen ◽

Jiajing Kou ◽

Hui Jin ◽

...

Keyword(s):

Density Functional Theory ◽

Sulfate Reduction ◽

Supercritical Water ◽

Density Functional ◽

Functional Theory ◽

Thermochemical Sulfate Reduction

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Precipitation of heavy metals from coal ash leachate using biogenic hydrogen sulfide generated from FGD gypsum

Water Science & Technology ◽

10.2166/wst.2012.546 ◽

2013 ◽

Vol 67 (2) ◽

pp. 311-318 ◽

Cited By ~ 13

Author(s):

Madawala Liyanage Duminda Jayaranjan ◽

Ajit P. Annachhatre

Keyword(s):

Heavy Metals ◽

Hydrogen Sulfide ◽

Sulfate Reduction ◽

Bottom Ash ◽

Coal Ash ◽

Reduction Process ◽

Fgd Gypsum ◽

Sulfate Reducing ◽

Sulfate Reduction Process ◽

Biological Sulfate Reduction

Investigations were undertaken to utilize flue gas desulfurization (FGD) gypsum for the treatment of leachate from the coal ash (CA) dump sites. Bench-scale investigations consisted of three main steps namely hydrogen sulfide (H2S) production by sulfate reducing bacteria (SRB) using sulfate from solubilized FGD gypsum as the electron acceptor, followed by leaching of heavy metals (HMs) from coal bottom ash (CBA) and subsequent precipitation of HMs using biologically produced sulfide. Leaching tests of CBA carried out at acidic pH revealed the existence of several HMs such as Cd, Cr, Hg, Pb, Mn, Cu, Ni and Zn. Molasses was used as the electron donor for the biological sulfate reduction (BSR) process which produced sulfide rich effluent with concentration up to 150 mg/L. Sulfide rich effluent from the sulfate reduction process was used to precipitate HMs as metal sulfides from CBA leachate. HM removal in the range from 40 to 100% was obtained through sulfide precipitation.

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