To enable a fair comparison, the energy required per kg of sulfur removed has also been calculated for each process. It is observed that the optimized IL desulfurization process has a requirement of 2.896 MJ/kg sulfur removed, which is significantly lower than that of the hydrodesulfurization process, 8.219 MJ/kg sulfur …
The current industrial method for removal of sulfur from fuels is hydrodesulfurization (HDS), which is a high temperature, high pressure catalytic process. This makes HDS a …
Hydrogen sulfide (H 2 S) is a notorious and lethal gas widely generated in human economic activities and natural occurrences. The growing demand for pollution …
Some microorganisms can consume sulfur in sulfur compounds such as DBT and reduce these compounds in the fuel. The biological desulfurization process takes place under mild conditions of temperature and pressure, and it is an environmentally friendly method [115], [116], [117].
The existence of sulfur and silica in bauxite influence the product quality of Bayer alumina. The synchronous desulfurization and desilication of low-grade and high-sulfur bauxite through reverse flotation processes were studied using modified starch as depressants in this work. The effects of depressant dosage, modified depressant dosage and collector …
During the desulfurization process, extracting time refers to the period during which oxidized sulfur compounds are extracted by a polar solvent while being shaken. A summary of the results is ...
Sulfur affects fuel quality, and the burning of fuel containing sulfur compounds caused adverse effects on humans and the environment. Nowadays, research has shifted focus to the development of desulfurization technologies to cut the sulfur content to permissible limits for gasoline and diesel. ... Oxidative desulfurization …
Major desulfurization methods of high-sulfur bauxite are floatation desulphurization, roasting desulphurization, and desulphurization in the digestion process. In the flotation desulfurization process, raw materials need to be ultra-finely ground, and then sulfonate traps are used to collect pyrite by inhibiting water seepage, which is very ...
The hydrodesulfurization process is a traditional process used for the desulfurization of heavy refractory sulfur compounds and requires severe operating conditions such as high pressure of hydrogen P H2 (3–11 MPa), high temperature (300–380 °C), and significant hydrogen gas [8].
The most popular method of desulfurization is removal of sulfur from molten steel to the basic reducing slag. Basic slag is a slag containing mainly basic oxides: CaO, MgO, MnO, FeO. A typical basic slag consists of 35-60% CaO + MgO, 10-25% FeO, 15-30% SiO 2, 5-20% MnO. Transition of sulfur from steel to slag may be presented by …
For YZ-D, YZ-N, and YZ-U, since these samples are treated based on YZC, the sulfur removal during the pre-desulfurization process could be as high as 64.93% for YZ-N, and 72.07% for YZ-U (Table 1). From Fig. 3, comparing with YZC, the changes of sulfur distribution in YZ-D and YZ-N are quite similar to the effect of acid treatment on …
Chelated-iron desulfurization technology is a wet redox desulfurization process that purifies sulfur-containing flue gas using iron or iron-based chelate as catalysts.
and High-Sulfur Bauxite by a Flotation Process Wencui Chai, Guihong Han, Yanfang Huang, Yijun Cao, and Jiongtian Liu Abstract The existence of sulfur and silica in bauxite influence the product quality of Bayer alumina. The synchronous desulfurization and desilication of low-grade and high-sulfur bauxite through reverse flotation processes
The upgrading of low-grade and high-sulfur bauxite before further processing involves a separation of diaspore from aluminosilicate and sulfur minerals. Reverse flotation is one of the most effective methods to realize the desulfurization and desilication of low-quality bauxite [ 1, 2 ].
Efficient pyrolytic desulfurization with high char yield is a promising yet challenging approach for the cleaner utilization of abundant high-sulfur coal reserves. In this study, we have discovered that a single pyrolysis process under either oxidizing or reducing conditions cannot efficiently remove various sulfur forms while preserving a …
Hydrogen sulfide (H2S) is a notorious and lethal gas widely generated in human economic activities and natural occurrences. The growing demand for pollution control makes it vital for the development of efficient processes to remove and convert H2S into high-valued products. As such, diversified technologies have been extensively explored, including …
When desulfurization was carried out with the SulFerox process, the sulfur content in the feed gas is about 0.3% to 0.4%, and the H 2 S content in the off gas can be reduced to 1 ppm when the desulfurization temperature of the process is below 50 °C.
Adsorptive desulfurization (ADS) is emerging as a low-cost alternative to ultra-deep hydrodesulfurization. In ADS, sulfur compounds are removed via …
Due to the most recent environmental requirements, wide desulfurization has become an increasingly important way to obtain ultra-clean fuels for transportation of less than 15 ppmw of sulfur, such ...
The desulfurization methods including variations thereon that are discussed include hydrodesulfurization, extractive desulfurization, oxidative desulfurization, …
1.3 Traditional Desulfurization Methods. The most commonly used traditional desulfurization method for naphtha is hydrodesulfurization (HDS). These methods primarily rely on the catalytic conversion of sulfur compounds into hydrogen sulfide (H 2 S) through chemical reactions involving hydrogen gas (H 2).. …
Numerous mitigation techniques have been incorporated to capture or remove SO2 with flue gas desulfurization (FGD) being the most common method. Regenerative FGD method is advantageous over other methods due to high desulfurization efficiency, sorbent regenerability, and reduction in waste handling. The …
1 Introduction. An unprecedented environmental and energy crisis is emerging due to rapid industrialization and increasing energy demand. Hydrogen sulfide (H 2 S), a notorious by-production of industrial exhausted gases, is highly toxic to humans and equipment, causing great damage to the environment as well. [1, 2] However, elemental …
In this study, gasoil with sulfur content of 1550 ppm was oxidized employing an ultrasound-assisted oxidative desulfurization system followed by an extraction stage.The results indicated that desulfurization efficiency of the oxidation stage was 20 %. Then, the oxidized gasoil was extracted by either DMF or acetonitrile or 50–50 vol.% …
The presence of sulfur in these materials causes technical problems in steel and alloys and environmental issues in the sintering of iron ore process. The achievement of higher sulfur removal rates has been an important goal since the development of …
Due to the most recent environmental requirements, wide desulfurization has become an increasingly important way to obtain ultra-clean fuels for transportation of less than 15 ppmw of sulfur, such as diesel, gasoline, and jet fuel. as a result of the strict requirements for transportation fuels.
In the Ni-based superalloys,sulfur segregation at the grain-boundary and the surface can easily reduce alloy lasting life and working stability at high temperature.To further reduce sulfur in the Ni-base superalloy,three ESR experiments were conducted for desulfurization of GH4169.The results indicated that the efficiency of desulfurization …
Numerous mitigation techniques have been incorporated to capture or remove SO2 with flue gas desulfurization (FGD) being the most common method. …
This blog post is the second in a three-part series that discusses flue gas desulfurization (FGD). The first post provides overviews of sulfur dioxide pollution (SO …
The reaction process, mechanism, and kinetics of the desulfurization of high-sulfur bauxite during calcination were investigated using thermal analysis–infrared analysis. A conveyor-bed calcination system was used to study the variations in the physical phase, desulfurization rate, and alumina dissipation rate of high-sulfur bauxite in the …
