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Desulfurization

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https://www.readbyqxmd.com/read/30095048/numerical-simulation-of-bypass-evaporation-system-treating-fgd-wastewater-using-high-temperature-flue-gas
#1
M A Shuang-Chen, Chai Jin, Chen Jia-Ning, Wu Kai, Wan Zhong-Cheng, Zhang Jing-Rui
A novel zero liquid discharge (ZLD) technology for desulfurization wastewater treatment is put forward in this paper. A ZLD reconstruction project performed on 2×320MW desulfurization system was taken as the research object, to study the evaporator structure and the key factors affecting spray evaporation through CFD numerical simulation. The result shows that when the evaporator diameter is 2.4m, the central density difference and temperature difference of evaporator outlets are 0kg/L and 0℃, under this condition, the wall sticking can be avoided effectively, and the uniformity of evaporator's outlet flow field is improved...
August 10, 2018: Environmental Technology
https://www.readbyqxmd.com/read/30080025/amino-modified-fe-terephthalate-metal-organic-framework-as-an-efficient-catalyst-for-the-selective-oxidation-of-h-2-s
#2
Xiao-Xiao Zheng, Li-Juan Shen, Xiao-Ping Chen, Xiao-Hai Zheng, Chak-Tong Au, Li-Long Jiang
Classical amino-functionalized Fe-terephthalate metal-organic framework NH2 -MIL-53(Fe) and its parent framework MIL-53(Fe) were prepared via simple hydrothermal methods. The catalytic performaces of these two Fe-MOFs were explored for the selective oxidation of H2 S. The physicochemical properties of the fresh and used Fe-MOFs catalysts were investigated by XRD, BET, SEM, FT-IR, CO2 -TPD, and XPS techniques. It was found that the introduction of amino groups reduces the activation energies for H2 S oxidation and endows this catalyst surface with moderate basic sites...
August 6, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30079722/direct-peptide-cyclization-and-one-pot-modification-using-the-medbz-linker
#3
Bengt Herbert Gless, Christian Adam Olsen
The one-pot synthesis and modification of cyclic peptides through a self-cleaving on-resin protocol is described. We apply Dawson's MeDbz linker to achieve direct intramolecular peptide cyclization by thioesterification followed by S->N acyl shift. This native chemical ligation approach requires no activating additive and allows direct modification of the crude cyclic peptides in one-pot. The strategy was applied to synthesize 5 cyclic peptide natural products of varying ring size. Finally, one-pot modifications include desulfurization, fluorophore conjugation, and intramolecular disulfide formation...
August 6, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/30078939/utilization-of-water-utility-lime-sludge-for-flue-gas-desulfurization-in-coal-fired-power-plants-part-ii-lime-sludge-characterization-and-mercury-reemission
#4
Seyed A Dastgheib, Hafiz H Salih, Jiaxing Li, Craig Patterson
The feasibility of utilizing lime sludge in the flue gas desulfurization process of coal-fired power plants was evaluated through laboratory-scale studies. Eight lime sludge samples, collected from various water treatment plants, and a high-purity limestone sample were extensively characterized and tested for their ability to capture SO2 from a simulated flue gas, while investigating the mercury reemission profiles during the scrubbing process. The reactivity of lime sludge samples for acid neutralization was significantly higher than the reactivity of the tested limestone sample...
June 21, 2018: Energy & Fuels: An American Chemical Society Journal
https://www.readbyqxmd.com/read/30078938/utilization-of-water-utility-lime-sludge-for-flue-gas-desulfurization-in-coal-fired-power-plants-part-i-supply-demand-evaluation-and-life-cycle-assessment
#5
Hafiz Salih, Craig Patterson, Jiaxing Li, Justin Mock, Seyed A Dastgheib
The feasibility of lime-softening sludge utilization for flue gas desulfurization in coal-fired power plants was evaluated through a supply-demand analysis and a life cycle assessment (LCA). To evaluate the demand and supply of lime sludge to replace limestone on a national scale, the annual amount of lime sludge generated by water treatment utilities in the United States was estimated and compared with the annual amount of limestone used by coal-fired power utilities. To evaluate the environmental sustainability of reusing lime sludge in power plants, an LCA study was performed in which the environmental impact and water footprint of the proposed approach were quantified and these results were compared with the conventional approaches for limestone mining, grinding, and transportation to power plants and lime sludge disposal in landfills...
June 21, 2018: Energy & Fuels: An American Chemical Society Journal
https://www.readbyqxmd.com/read/30077832/sucrose-facilitated-synthesis-of-mesoporous-silicoaluminophosphate-sapo-11-with-different-crystalline-phases-of-moo-3-for-highly-efficient-oxidative-desulfurization
#6
Guangxue Yang, Xueyao Zhang, Honglei Yang, Yu Long, Jiantai Ma
The mesoporous silicoaluminophosphate SAPO-11 materials were synthesized by using the green and low-cost sucrose as template. The SAPO-11 were characterized by SEM, TEM, N2 physisorption and FT-IR. Sucrose was incorporated into the crystal structure of SAPO-11 crystals to form secondary mesoporosity. Meanwhile, the mesoporous MoVI /SAPO-11 samples with different MoO3 crystalline phases were synthesized. In addition, the pre-prepared optimal catalyst (with 3.6% molybdenum mass content) showed significantly high yield and durability for oxidative desulfurization (ODS)...
July 19, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30065711/construction-and-characterization-of-a-new-recombinant-vector-to-remove-sulfate-repression-of-dsz-promoter-transcription-in-biodesulfurization-of-dibenzothiophene
#7
Somayeh Khosravinia, Mahmood A Mahdavi, Reza Gheshlaghi, Hesam Dehghani, Behnam Rasekh
Biodesulfurization (BDS) is an environmentally friendly desulfurizing process with the potential of replacing or adding to the current expensive technologies for sulfur removal from fossil fuels. The BDS, however, still suffers from low biocatalyst activity. One reason is repression of dsz promoter transcription in presence of inorganic sulfate that impedes translation of Dsz enzymes required for desulfurization pathway. One approach to solve this problem is replacing the native promoter with a new promoter that is no longer repressed...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/30063876/influence-of-pollutants-control-facilities-on-pm-2-5-profiles-emitted-from-iron-and-steel-plant
#8
Yangyang Guo, Lei Luo, Yang Zheng, Tingyu Zhu, Meng Ye
A typical long process iron and steel plant has been investigated with four main manufacturing processes, nine sample sites were selected, to provide a comprehensive understanding of the PM2.5 profile changes caused by the pollutants control facilities. The result shows pollutants control facilities have not only affected PM2.5 concentrations, also the PM2.5 profiles. PM2.5 concentration was increased 1.89 times after Flue gas desulfurization (FGD) in sintering process, the Ca content in PM2.5 increased to 21...
July 31, 2018: Environmental Technology
https://www.readbyqxmd.com/read/30041118/oxidative-desulfurization-process-of-model-fuel-under-molecular-oxygen-by-polyoxometalate-loaded-in-hybrid-material-cnts-mof-199-as-catalyst
#9
Yan Gao, Ziyan Lv, Ruimin Gao, Gai Zhang, Ying Zheng, Jianshe Zhao
Fuel desulfurization as a crucial subject has aroused people's attention with the environmental problems becoming more and more important. Oxidative desulfurization (ODS) is one of the most promising methods due to its high efficiency, low cost, easy operation and mild reaction condition. With the loading of polyoxometalate (POM), a hybrid material (CNTs@MOF-199) supported catalysts (CNTs@MOF-199-POM) are designed and prepared using one-pot procedure. The novel catalysts are investigated by FT-IR, XRD, XPS, SEM and BET...
July 6, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30025069/iron-oxides-minimize-arsenic-mobility-in-soil-material-saturated-with-saline-wastewater
#10
Madhubhashini B Galkaduwa, Ganga M Hettiarachchi, Gerard J Kluitenberg, Stacy L Hutchinson
The soil material in constructed wetlands is effective in retaining Se from flue-gas desulfurization (FGD) wastewater (WW), but reducing conditions can enhance native-soil As mobility. A laboratory-based soil column experiment was performed to assess the effectiveness of ferrihydrite (Fh) in minimizing the mobility of native-soil As in water-saturated soil material. A saline FGD WW mixture (i.e., influent) was delivered to columns of untreated and Fh-treated soil for 60 d. One untreated column and one Fh-treated column were then subjected to drying, followed by an additional 30 d of influent delivery...
July 2018: Journal of Environmental Quality
https://www.readbyqxmd.com/read/30025067/impact-of-flue-gas-desulfurization-gypsum-and-manure-application-on-transfer-of-potentially-toxic-elements-to-plants-soil-and-runoff
#11
H Allen Torbert, Dexter B Watts, Rufus L Chaney
There are concerns regarding the fate of nutrients from surface application of animal manure. One approach to reduce losses of P is to treat manure with industrial byproducts such as flue gas desulfurization (FGD) gypsum. However, concerns regarding potentially toxic elements contributed to the environment have arisen based on previous element-rich forms of FGD gypsum that included fly ash, whereas "new" FGD gypsum without fly ash is much lower in contaminants. This study examined the impact of FGD gypsum application on soil, plants, and runoff when applied alone or with poultry litter (PL) to soil...
July 2018: Journal of Environmental Quality
https://www.readbyqxmd.com/read/30005297/h-2-o-2-decomposition-mechanism-and-its-oxidative-desulfurization-activity-on-hexagonal-boron-nitride-monolayer-a-density-functional-theory-study
#12
Hongping Li, Yujun Li, Linghao Sun, Suhang Xun, Wei Jiang, Ming Zhang, Wenshuai Zhu, Huaming Li
Hydrogen peroxide (H2 O2 ) decomposition mechanism and its oxidative desulfurization activity on hexagonal boron nitride monolayer (h-BN) have been explored by density functional theory (DFT) at M06-2X/6-311 + G (d,p) level. A cluster model which contains seven rings has been constructed to simulate the h-BN surface. It is found that 7 possible species will be generated after the decomposition of H2 O2 . Among them, 2H*+O2 * and 2H*+2O* are relatively unstable while other species, such as HOO*+H*, HO*+HO*, H*+HO + O*, H2 O*+O* are relatively stable and may exist in the current system...
July 5, 2018: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/30002316/improving-the-catalytic-performance-of-keggin-pw-12-o-40-3-for-oxidative-desulfurization-ionic-liquids-versus-sba-15-composite
#13
Susana O Ribeiro, Beatriz Duarte, Baltazar de Castro, Carlos M Granadeiro, Salete S Balula
Different methodologies were used to increase the oxidative desulfurization efficiency of the Keggin phosphotungstate [PW12 O40 ]3- (PW12 ). One possibility was to replace the acid proton by three different ionic liquid cations, forming the novel hybrid polyoxometalates: [BMIM]₃PW12 (BMIM as 1-butyl-3-methylimidazolium), [BPy]₃PW12 (BPy as 1-butylpyridinium) and [HDPy]₃PW12 (HDPy as hexadecylpyridinium. These hybrid Keggin compounds showed high oxidative desulfurization efficiency in the presence of [BMIM]PF₆ solvent, achieving complete desulfurization of multicomponent model diesel (2000 ppm of S) after only 1 h, using a low excess of oxidant (H₂O₂/S = 8) at 70 °C...
July 12, 2018: Materials
https://www.readbyqxmd.com/read/29998699/-effects-of-gypsum-on-ch-4-emission-and-functional-microbial-communities-in-paddy-soil
#14
Xiang-Yu Hu, Qiu-Jie Xiang, Zhi-Jian Mu
In this study, the effects of gypsum (FGD) on CH4 emission and functional microbial community in paddy soil were identified under five treatments, including FGDG0 (0 t·hm-2 ), FGDG1 (2 t·hm-2 ), FGDG2 (4 t·hm-2 ), FGDG3 (8 t·hm-2 ), and FGDG4 (16 t·hm-2 ). The methane flux was determined using static chamber and chromatography. Bacterial community structure and its effect on soil bacterial community structure, and the abundance of methanogenic and methanotrophs were measured via high-throughput sequencing and quantitative PCR...
August 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
https://www.readbyqxmd.com/read/29998554/specific-downregulation-of-cystathionine-%C3%AE-synthase-expression-in-the-kidney-during-obesity
#15
Mi Liu, Mokan Deng, Jiahui Su, Yu Lin, Zhanjun Jia, Kexin Peng, Fei Wang, Tianxin Yang
Hydrogen sulfide (H2 S) is recognized as a novel gasotransmitter involved in the regulation of nervous system, cardiovascular functions, inflammatory response, gastrointestinal system, and renal function. Cystathionine β-synthase (CBS) and cystathionine γ-lyase (CSE) are the major enzymes responsible for H2 S production through desulfuration reactions. H2 S is reported to play a protective role in both high-fat diet (HFD)-induced obese and diabetic mice. However, the synthesizing enzyme involved is not clearly elucidated...
July 2018: Physiological Reports
https://www.readbyqxmd.com/read/29989396/one-pot-catalytic-cleavage-of-c%C3%A2-s-double-bonds-by-pd-catalysts-at-room-temperature
#16
Ting Zhu, Xiaoxi Wu, Xinzheng Yang, Bigyan Sharma, Na Li, Jiaming Huang, Wentao Wang, Wang Xing, Zhenwen Zhao, Hui Huang
The C═S double bonds in CS2 and thioketones were catalytically cleaved by Pd dimeric complexes [(N∧ N)2 Pd2 (NO3 )2 ](NO3 )2 (N∧ N, 2,2'-bipyridine, 4,4'-dimethylbipyridine or 4,4'-bis(trifluoromethyl)) at room temperature in one pot to afford CO2 and ketones, respectively, for the first time. The mechanisms were fully investigated by kinetic NMR, isotope-labeled experiments, in situ ESI-MS, and DFT calculations. The reaction is involved a hydrolytic desulfurization process to generate C═O double bonds and a trinuclear cluster, which plays a pivotal role in the catalytic cycle to regenerate the dimeric catalysts with HNO3 ...
July 10, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29986222/treatment-of-industrial-wastewater-produced-by-desulfurization-process-in-a-coal-fired-power-plant-via-fo-md-hybrid-process
#17
Songbok Lee, Youngjin Kim, Seungkwan Hong
In this study, the feasibility of forward osmosis (FO) hybridized with membrane distillation (MD) was systematically investigated for treating flue gas desulfurization (FGD) wastewater. FO experiments were conducted using raw FGD wastewater obtained from a coal-fired power plant in Korea. Severe membrane fouling in FO was observed since FGD wastewater contained various components (i.e., particles, colloids, organics, and ions). The combined fouling layer by particulates and scales was identified via scanning electron microscope (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD)...
June 30, 2018: Chemosphere
https://www.readbyqxmd.com/read/29983540/ranking-coal-ash-materials-for-their-potential-to-leach-arsenic-and-selenium-relative-importance-of-ash-chemistry-and-site-biogeochemistry
#18
Grace E Schwartz, James C Hower, Allison L Phillips, Nelson Rivera, Avner Vengosh, Heileen Hsu-Kim
The chemical composition of coal ash is highly heterogeneous and dependent on the origin of the source coal, combustion parameters, and type and configuration of air pollution control devices. This heterogeneity results in uncertainty in the evaluation of leaching potential of contaminants from coal ash. The goal of this work was to identify whether a single leaching protocol could roughly group high-leaching potential coal ash from low-leaching potential coal ash, with respect to arsenic (As) and selenium (Se)...
July 1, 2018: Environmental Engineering Science
https://www.readbyqxmd.com/read/29983072/multiform-sulfur-adsorption-centers-and-copper-terminated-active-sites-of-nano-cus-for-efficient-elemental-mercury-capture-from-coal-combustion-flue-gas
#19
Zequn Yang, Hailong Li, Shihao Feng, Pu Li, Chen Liao, Xi Liu, Jiexia Zhao, Jianping Yang, Po-Heng Lee, Kaimin Shih
Nanostructured copper sulfide synthesized with the assistance of surfactant with nanoscale particle size and high Brunauer-Emmett-Teller surface area was for the first time applied for the capture of elemental mercury (Hg0 ) from coal combustion flue gas. The optimal operation temperature of nano-CuS for Hg0 adsorption is 75 °C, which indicates that injection of the sorbent between the wet flue gas desulfurization and the wet electrostatic precipitator systems is feasible. This assures that the sorbent is free of the adverse influence of nitrogen oxides...
July 31, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29975390/preparation-characterization-and-catalytic-performances-of-a-pyrazine-dicarboxylate-bridging-rare-earth-containing-polytungstoarsenate-aggregate-for-selective-oxidation-of-thiophenes-and-deep-desulfurization-of-model-fuels
#20
Yanjun Niu, Qiaofei Xu, Yuan Wang, Zhao Li, Jingkun Lu, Pengtao Ma, Chao Zhang, Jingyang Niu, Jingping Wang
A new polytungstoarsenate, K6LiH6[Ce4(H2O)14(pzdc)(H2pzdc)As3W29O103]·22H2O (1) (H2pzdc = 2,3-pyrazinedicarboxylic acid), was synthesized via a conventional aqueous solution method. In this synthetic approach, the organic ligand pyrazine dicarboxylate acid was introduced into the arsenotungstate system. The synthesized compound 1 was well characterized using elemental analysis, IR spectroscopy, UV-vis spectroscopy, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction...
July 24, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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