Transformation of organic sulfur and its functional groups in nantong and laigang coal under microwave irradiation

2019 ◽  
Vol 40 (31) ◽  
pp. 2749-2760 ◽  
Author(s):  
Yue Wu ◽  
Shengfu Zhang ◽  
Shuangshuang Cai ◽  
Xiong Xiao ◽  
Cheng Yin ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Functional Groups ◽  
Organic Sulfur

Microwave Applied in Coal Desulfurization Process

2011 ◽  
Vol 71-78 ◽  
pp. 2122-2126 ◽  
Author(s):  
Jie Mi ◽  
Rui Di Wei
Keyword(s):  
Microwave Irradiation ◽  
Irradiation Time ◽  
Sulfur Removal ◽  
Organic Sulfur ◽  
Xps Analysis ◽  
Peroxyacetic Acid ◽  
Inorganic Sulfur ◽  
Coal Desulfurization ◽  
Desulfurization Process ◽  
Sulfur In Coal

In this paper, the desulfurization of Fangshan coal was carried out by tetrachloroethylene extraction under ultrasonic and microwave irradiation. The GC-MS analysis of the tetrachloroethylene extraction reveals that organic sulfur in coal can be removed by tetrachloroethylene extract under ultrasonic and microwave irradiation. It is found that microwave irradiation time has great effect on organic sulfur removal. With the microwave irradiation time increases, the efficiency of organic sulfur removal increases. The desulphurization yield reaches maximum, 45%, when the time is 30 minutes or more. It can be clearly seen that Fangshan coal was oxidated by peroxyacetic acid under ultrasonic and microwave irradiation. From the XPS analysis of the macerals of the coal, most of the inorganic sulfur and organic sulfur are removed, especially thioether and thioalcohol which can be completely removed. These results suggest that microwave is an effective way to remove sulfur in coal.

scholarly journals Gold film-catalysed benzannulation by Microwave-Assisted, Continuous Flow Organic Synthesis (MACOS)

2009 ◽  
Vol 5 ◽  
Author(s):  
Gjergji Shore ◽  
Michael Tsimerman ◽  
Michael G Organ
Keyword(s):  
Microwave Irradiation ◽  
Functional Groups ◽  
Organic Synthesis ◽  
Continuous Flow ◽  
Metal Film ◽  
Silver Film ◽  
Gold Film ◽  
Microwave Assisted ◽  
Glass Capillaries ◽  
Inner Surface

Methodology has been developed for laying down a thin gold-on-silver film on the inner surface of glass capillaries for the purpose of catalysing benzannulation reactions. The cycloaddition precursors are flowed through these capillaries while the metal film is being heated to high temperatures using microwave irradiation. The transformation can be optimized rapidly, tolerates a wide number of functional groups, is highly regioselective, and proceeds in good to excellent conversion.

Removal of Organic Sulfur in Two Coals in Microwave and Ultrasonic Co-Enhanced Oxidative Process

2013 ◽  
Vol 781-784 ◽  
pp. 923-926 ◽  
Author(s):  
Zhao Ting Pu ◽  
Jie Mi ◽  
Jian Kang
Keyword(s):  
Microwave Irradiation ◽  
Microwave Heating ◽  
Ultrasonic Irradiation ◽  
Oxidative Desulfurization ◽  
Organic Sulfur ◽  
Oxidative Process ◽  
Optimum Conditions ◽  
Desulfurization Rate ◽  
Sulfur In Coal

Microwave heating has been used in desulfurization of coal. Removal of organic sulfur and organic sulfur forms alterations of Xishan (XS) coal and Yunnan (YN) coal was investigated under microwave and ultrasonic irradiation. The results showed the optimum conditions for desulfurization were 50 min and 560 W for microwave and ultrasound for both coals. The desulfurization rate was maximum 23.53% for XS coal and 76.58% for YN coal. The effect of combining microwave and ultrasonic irradiation on desulfurization was stronger than simple microwave irradiation. The content of sulphone sulfur in coal was increased from the XPS after microwave and ultrasonic co-enhanced oxidative desulfurization.

3-Carboxypyridinium chlorochromate – aluminium chloride — An efficient and inexpensive reagent system for the selective oxidation of sulfides to sulfoxides and sulfones in solution and under microwave irradiation

2005 ◽  
Vol 83 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Iraj Mohammadpoor-Baltork ◽  
Hamid R Memarian ◽  
Kiumars Bahrami
Keyword(s):  
Microwave Irradiation ◽  
Functional Groups ◽  
Selective Oxidation ◽  
Lewis Acid ◽  
Aluminium Chloride ◽  
Double Bonds ◽  
Oxidation Of Sulfides ◽  
Efficient Reagent

3-Carboxypyridinium chlorochromate (CPCC) in the presence of aluminium chloride is a very efficient reagent for the selective oxidation of sulfides to sulfoxide and sulfones in solution and under microwave irradiation. It is noteworthy that different functional groups including carbon–carbon double bonds, ketones, oximes, aldehydes, ethers, and acetals were tolerated under these reaction conditions.Key words: sulfoxides, sulfones, oxidation, chlorochromate, Lewis acid.

(Aminophenyl)porphyrins as precursors for the synthesis of porphyrin-modified siloxanes

2019 ◽  
Vol 23 (09) ◽  
pp. 1001-1012
Author(s):  
José Almeida ◽  
Maria E. Fortună ◽  
Lucia Pricop ◽  
Andrei Lobiuc ◽  
Andreia Leite ◽  
...  
Keyword(s):  
Optical Properties ◽  
Microwave Irradiation ◽  
Functional Groups ◽  
Emission Spectra ◽  
Efficient Synthesis ◽  
Subsequent Reaction ◽  
Maldi Tof Ms ◽  
Absorption And Emission ◽  
H Nmr ◽  
Tof Ms

The present research reports the efficient synthesis of mono- and di-(aminophenyl)porphyrins and their metalation with Zn(II) using microwave irradiation. The subsequent reaction of amino-functionalized porphyrins with siloxane moieties bearing epoxy or carboxyl functional groups provided four new porphyrin-modified siloxanes. The structure of the resulting derivatives was established by 1H-NMR and MALDI-TOF-MS. The optical properties of the porphyrin chromophores were preserved, as proven by comparing the absorption and emission spectra of the initial porphyrins to those of the porphyrin-modified siloxanes.

Environmentally Friendly Nafion-Mediated Friedländer Quinoline Synthesis under Microwave Irradiation: Application to One-Pot Synthesis of Substituted Quinolinyl Chalcones

Synthesis ◽  
2020 ◽  
Vol 52 (12) ◽  
pp. 1779-1794 ◽  
Author(s):  
Cheng-Chung Wang ◽  
Chieh-Kai Chan ◽  
Chien-Yu Lai
Keyword(s):  
Microwave Irradiation ◽  
Single Crystal ◽  
Diffraction Analysis ◽  
Functional Groups ◽  
Chemical Method ◽  
Solid Catalyst ◽  
Synthetic Route ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray

An efficient and eco-friendly synthetic route for Friedländer quinoline synthesis of polysubstituted quinolines is described. This green chemical method starts from various 2-aminobenzophenones and mono- or dicarbonyl synthons and uses reusable Nafion NR50 material as a solid catalyst in ethanol under microwave irradiation. The protocol has a high generality of functional groups and provides the desired quinolines in good to excellent yields. Some structures were confirmed by single-crystal X-ray diffraction analysis.

Sign in / Sign up

Export Citation Format

Share Document