2024 Thiophenic sulfur

Thiophenic sulfur

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August undefined, 2024

WebNov 1, 2008 · Particularly, in the 1990s, Mobil and BP invented the olefins alkylation thiophenic sulfur (OATS) technology to be the other alternative to the conventional hydrodesulfurization (HDS) process [7], [8]. In general, OATS process contains two steps: … WebSep 18, 2012 · The potential of MOFs for being successful sulfur-selective adsorbents for thiophenic molecules from model feed was reported for HKUST-1, CPO-27-Ni, RHO-ZMOF, ZIF-8, and ZIF-76 by Perlada et al. [77].

Desulfurization of Dibenzothiophene by Pseudomonas

WebThe results suggested that 15–30% of the organic sulfur is sulfidic. Attar and co-workers reported that about 30–40% of the organic sulfur in lignite is thiolic and the rest occurs as sulfides and thiophenic compounds. In bituminous coal, 40–60% of the organic sulfur is thiophenic and the rest is bonded in thiols and sulfides. WebMar 1, 2015 · Oxidative desulfurization of thiophenic sulfur compounds of benzothiophene (BT), dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT) with MoO x /Al 2 O 3 catalyst and H 2 O 2 oxidant has been facilitated and more selective under ultrasonic irradiation. The catalyst with the optimum 10% of Mo loading consisted of … check your spam or junk folder

Adsorption Equilibrium of Thiophenic Sulfur Compounds …

WebGiven the continued increase of sulfur (mostly formed by thiophenic S) content of petroleum coke and the inefficient desulfurization in the carbon anode process, the sulfur content of anode is becoming increasingly difficult to control. All of the sulfur in anode will be … WebJun 1, 2013 · The thiophenic sulfur compounds started decomposing when the temperature rose above 800°C (Calkins, 1987); they decomposed into sulfur radicals first, and then the products might have reacted with other sulfur-containing compounds. Consequently, the … WebEnter the email address you signed up with and we'll email you a reset link. check your spelling or try different ke

IJERPH Free Full-Text Dibenzothiophene Removal from Fuel Oil …

WebJun 26, 2024 · Another reason was that there was another interaction between the active H atom of PEG and the S atom of thiophenic sulfides, which made sulfur compounds easier to extract with PEG than methylbenzene. WebThiophenic sulfur compounds are released during coal gasification, carbonization, and combustion. Previous studies indicate that thiophenic sulfur compounds degrade very slowly in the environment, and are more carcinogenic than polycyclic aromatic … check your spamWebJun 1, 2013 · The incomplete reduction of thiophenic structures, particularly those with more than two rings significantly decreases the sulfur transfer into H2S, the extent of sulfur transfer into tar product ... check your speed internet

"Webthiophenic sulfur from a variety of liquid hydrocarbons fuels at ambient temperature, and a π-bonding mechanism has been invoked [2]. As a result of programmatic needs to prepare very low sulfur feedstocks to enable fuel reforming for fuel cell operation, we investigated Cu(I)Y zeolite with the intention to verify and quantify its performance. " - Thiophenic sulfur

Thiophenic sulfur

Adsorption Behavior of Metal–Organic Frameworks for …

WebDec 20, 2024 · Dibenzothiophene (DBT) is a typical recalcitrant thiophenic sulfur component of fuels, and its desulphurization has been a model reaction in the treatment of these compounds. Based on this information, the potential of Pseudomonas fluorescens (UCP 1514) on the desulfurization of dibenzothiphene was studied, in order to use it for … WebAug 30, 2024 · DFT calculation shows that under microwave irradiation, the energy barrier and activation energy of rate-limiting step for thiophenic sulfur removal decrease by 7.6 kJ/mol and 2.24 kcal/mol, and ...

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WebThiophenic compounds constitute a class of sulfur compounds derived by thiophene, containing at least one thiophenic ring. Their presence in fuels (crude oil, etc.) is important and can reach 3% m/m. The combustion of fuels leads to the formation of sulfur oxides a severe source of environmental pollution issues, such as acid rain with adverse effects … WebFeb 13, 2015 · Microorganisms possess enormous highly specific metabolic activities, which enable them to utilize and transform nearly every known chemical class present in crude oil. In this context, one of the most studied biocatalytic processes is the biodesulfurization (BDS) of thiophenic sulfur-containing compounds such as …

WebJan 20, 2015 · Sulfur compounds were methylated to sulfonium salts by AgBF4 and CH3I, then the polar salts were separated by precipitation from petroleum matrix. The thiophenic and sulfidic sulfonium salts were sequentially demethylated with 7-azaindole and 4 … WebThe OATSTM process (Olefin Alkylation of Thiophenic Sulphur), developed by BP, is capable of removing over 99.5% of the sulphur compounds in FCC naphtha. El proceso OATSTM (Olefin Alkylation of Thiophenic Sulphur, alquilación olefínica del azufre tiofénico ), desarrollado por BP, es capaz de eliminar más del 99,5% de los componentes de ...

WebMay 29, 2024 · The Gordonia sp. W3S5, isolated from oil-polluted soil samples can remove sulfur from a variety of symmetric and asymmetric thiophenic compounds and diesel oil. Its draft genome sequence was comprised of 49 contigs, total genome size 4.86 Mb, and a G + C content of 67.50%. According to the current bacterial taxonomy procedures (16S rRNA …

WebNov 11, 2008 · HY zeolite modified by La2O3 on olefin alkylation of thiophenic sulfur in fluid catalytic cracking (FCC) gasoline was studied in the micro fixed-bed reactor. Reaction pressure 1.5 MPa, reaction temperature 180 °C, WHSV 3.5 h−1, using HY zeolite modified by 2% La2O3, the conversion of thiophene sulfur promoted nearly 10% with good selectivity, …

WebJun 25, 2024 · In order to investigate the competitive adsorption between aromatics and thiophenic sulfur compounds, 10 wt% of tert-butyl benzene was mixed with model fuel containing 550 ppmw thiophene in ... check your spanish levelWebApr 16, 2012 · Thiophenic sulfur is alkylated in the OATS reactor employing acidic catalysts. After the reactor, the feed is sent to a conventional distillation column where it is separated into a light sulfur-free naphtha and a heavy sulfur-rich stream. The light naphtha is directly sent to the gasoline pool and the heavy stream is preferably hydrotreated. flattering haircuts after 60WebFeb 2, 2024 · The third most abundant heteroatom in crude oil is sulfur which contributes approximately 10% of the total crude oil chemical composition. It is estimated that 50–95% of the sulfur content in petroleum and its derivative fractions is in the form of thiophenic sulfur where alkylated derivatives of dibenzothiophenes (DBTs) comprise the … flattering gym shortsWebNov 15, 2024 · Request PDF Boosting the Adsorption Performance of Thiophenic Sulfur Compounds with a Multimetallic Dual Metal–Organic Framework Composite Adsorptive desulfurization over metal-organic ... flattering haircuts for round faceThiophene is a heterocyclic compound with the formula C4H4S. Consisting of a planar five-membered ring, it is aromatic as indicated by its extensive substitution reactions. It is a colorless liquid with a benzene-like odor. In most of its reactions, it resembles benzene. Compounds analogous to thiophene include … See more Thiophene was discovered as a contaminant in benzene. It was observed that isatin (an indole) forms a blue dye if it is mixed with sulfuric acid and crude benzene. The formation of the blue indophenin had long … See more At room temperature, thiophene is a colorless liquid with a mildly pleasant odor reminiscent of benzene, with which thiophene shares … See more • Some Thiophenes • Thieno[3,2-b]thiophene, one of the four thienothiophenes. See more • International Chemical Safety Card 1190 • Chisholm, Hugh, ed. (1911). "Thiophen" . Encyclopædia Britannica. Vol. 26 (11th ed.). Cambridge University Press. See more Reflecting their high stabilities, thiophenes arise from many reactions involving sulfur sources and hydrocarbons, especially unsaturated ones. … See more Thiophene is considered to be aromatic, although theoretical calculations suggest that the degree of aromaticity is less than that of benzene. The "electron pairs" on sulfur are significantly See more Thiophenes are important heterocyclic compounds that are widely used as building blocks in many agrochemicals and pharmaceuticals. The benzene ring of a biologically active … See more flattering hair color for olive skinWebSep 15, 2006 · Copper oxide adsorbents are normally quite unreactive with thiophenic sulfur compounds, while in contrast, they readily react with and adsorb mercaptans (also known as thiols), see for example the recent work by King et. al. in Ref. [1]. It is well known that Cu-based adsorbents are less efficient than Ni-based, and often sulfur is observed to ... flattering haircuts for round full facesWebJan 20, 2015 · Sulfur compounds were methylated to sulfonium salts by AgBF4 and CH3I, then the polar salts were separated by precipitation from petroleum matrix. The thiophenic and sulfidic sulfonium salts were sequentially demethylated with 7-azaindole and 4-dimethylaminopyridine, obtaining original thiophenic and sulfidic compounds, respectively. flattering haircuts for plus size women