China
Africa
Explore chapters and articles related to this topic
1 Sources
Published in Saeed Sahebdelfar, Maryam Takht Ravanchi, Ashok Kumar Nadda, 1 Chemistry, 2022
Saeed Sahebdelfar, Maryam Takht Ravanchi, Ashok Kumar Nadda
Sweetening of sour gas is a critical purification step as sulfur compounds (mainly H2S ) are corrosive and poisonous. Their presence in fuels results in emission of SOx upon combustion which are important and regulated air pollutants. They are also the poisons of many downstream catalysts in methane conversion processes. A common method for desulfurization is chemical absorption process with aqueous alkanolamine solutions; such as monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), di-isopropanolamine (DIPA) and methyldiethanolamine (MDEA). MDEA can absorb H2S selectively in the presence of CO2 . The use of selective polymer membranes is limited to CO2 removal and still needs further developments (Faramawy et al., 2016).
2 removal of sintering flue gas: Performance and mechanism
Published in Domenico Lombardo, Ke Wang, Advances in Materials Science and Engineering, 2021
In this paper, the MgO-based desulfurization technology was tested on sintering flue gas, and the absorption mechanism is discussed. The products of the technology can be used for resources, and the desulfurization process is environmentally friendly.
Desulfurization of Diesel Fuels
Published in Ozcan Konur, Petrodiesel Fuels, 2021
Thus, the efficient desulfurization of sulfur compounds in petrodiesel and related fuels would be helpful in reducing SO2 emissions, especially in shipping, transport, and the power sectors, by reducing the adverse impact of these emissions on ecology and human health, meeting the great public concern in this area.
Oxidative desulfurization utilizing activated carbon supported phosphotungstic acid in the frame of ultrasonication
Published in Chemical Engineering Communications, 2023
Gerje Ronelle H. Barilla, Charles Adrian W. Chen, Martin Zechariah M. Valencia, Nathaniel P. Dugos, Angelo Earvin Sy Choi
The process wherein the sulfur content of a fuel is reduced to an acceptable value is called desulfurization. Desulfurization is classified as pre-combustion, wherein sulfur is removed prior to burning the fuel, and post-combustion, wherein sulfur is removed after the burning process. Hydrodesulfurization (HDS) is the conventional desulfurization of fuel oils (Chen et al. 2021). However, there are multiple drawbacks in this desulfurization technology. HDS requires high energy consumption due to extreme conditions that operates at high temperature (300 °C to 440 °C), high pressure (3 MPa to 6 MPa), and spends a considerable amount of hydrogen that translates to expensive costs (Zhang et al. 2021). Moreover, the aromatic sulfur compounds such as thiophenes, BT, and DBT have low reactivities toward the HDS that presents a limitation to this process (Margeta et al. 2016). Therefore, various studies regarding alternative processes have been developed to cover the limitations of the HDS.
The application of combined lignite cleaning processes, bacterial leaching and flotation, for reducing higher ash and sulfur contents
Published in International Journal of Coal Preparation and Utilization, 2022
Sulfur can be removed from coal physically, chemically, or biologically. The physical methods are widely known and used, although they do separate much of the mineral material, these methods have no effect on organic sulfur. Chemical methods rely on oxidizing agents and alkaline and acidic solutions to separate mineral matter from coal, and although yields are good (about 90% inorganic and 10% organic sulfur are removed), part of the combustible matter of the coal is lost (Cara et al. 2006). Major disadvantages of these physical and chemical desulfurization techniques include high costs, production of waste materials, and insufficient selectivity. Therefore, this has led to increased research efforts on biological methods which may turn out to be an alternative (Celik et al. 2019; Tabatabae et al. 1996). Their main advantages of the biological methods are highly moderate reaction conditions compared to chemical reactions, little or no energy demand, fewer chemical agents, and, above all, no loss of coal, and no production of wastes generating serious problems for the environment.
Ce/Al2O3 as an efficient catalyst for oxidative desulfurization of liquid fuel
Published in Petroleum Science and Technology, 2019
Desulfurization of petroleum products is important from both industrial and environmental point of view. Sulfur compounds if present in liquid fuels such as diesel and petrol get emitted from internal combustion engines in the form of oxides of sulfur which further cause acid rain and various other environmental problems. Also, sulfur present in liquid fuels poisons catalytic converters, corrodes parts of internal combustion engines and refinery facilities due to the formation of oxy-acids of sulfur (Srivastava 2012; Kumar et al. 2017). Various technologies such as hydrodesulfurization, adsorption, biodesulfurization, oxidative desulfurization (ODS), etc. are being explored by various investigators for the removal of sulfur compounds from liquid fuels (Jiao et al. 2006; Muzic et al. 2011; Thaligari et al. 2015; Kumar et al. 2015; Thaligari et al. 2016).