Desulfurization of organic sulfur in high sulfur coal by oxidation and microwave irradiation

2015 ◽  
pp. 407-411
Author(s):  
Song Liu ◽  
MingXu Zhang ◽  
Tao Ge ◽  
Hao Xia
Keyword(s):  
Microwave Irradiation ◽  
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.

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

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.

Fundamental study on removal of organic sulfur from coal by microwave irradiation

2015 ◽  
Vol 139 ◽  
pp. 31-35 ◽  
Author(s):  
Xiangmei Ma ◽  
Mingxu Zhang ◽  
Fanfei Min ◽  
Tao Ge ◽  
Chuanchuan Cai
Keyword(s):  
Microwave Irradiation ◽  
Organic Sulfur ◽  
Fundamental Study

Evaluation of Microwave-Assisted Organic Acid Separation of Organic Sulfur from High Sulfur Coal

2021 ◽  
Author(s):  
Chaoshun Jiang ◽  
Jin Liu ◽  
Shen Hao ◽  
Zheng Pang ◽  
Zhi Wang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Citric Acid ◽  
Oxalic Acid ◽  
Microwave Irradiation ◽  
Organic Acids ◽  
Organic Acid ◽  
Removal Rate ◽  
Organic Sulfur ◽  
Microwave Assisted ◽  
Operation Conditions

Abstract To explore the feasibility of organic acid removal of organic sulfur from high sulfur coal, three organic acids, oxalic acid, citric acid and ascorbic acid, were selected as desulfurization reagents. Combined with microwave irradiation technology, desulfurization experiments of high-sulfur coal treated with nitric acid were conducted. The orthogonal experimental results showed that microwave synergistic citric acid desulfurization had a better desulfurization effect. The removal rate of organic sulfur was 55.47% when the operation conditions of the reaction were 1 mol/L, 90 ℃ and 1000 W for 7 min. The desulfurization efficiency of oxalic acid and ascorbic acid was not good, and the removal efficiencies of organic sulfur were 32.35% and 21.37%, respectively. Fourier transform infrared spectroscopy showed that sulfones and sulfoxides were partially reduced and that the removal effect of thiophene was poor. X-ray photoelectron spectroscopy showed that the mercapto group in the mercaptan combined with hydrogen ions and escaped in the form of H2S. The content of aromatic thioether and aromatic thiol in the coal treated with microwave irradiation was only 0.1%. Research indicates that microwave-assisted organic acid removal of organic sulfur is feasible, and researchers can explore more efficient organic acids as desulfurization reagents based on this study.

Eco-Friendly Synthesis of Pyrazoline Derivatives

2017 ◽  
Vol 9 (04) ◽  
Author(s):  
Mahesh G. Kharatmol ◽  
Deepali Jagdale
Keyword(s):  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Organic Synthesis ◽  
Ultrasonic Irradiation ◽  
Minimal Energy ◽  
Anticancer Activities ◽  
Conventional Methods

Pyrazoline class of compounds serve as better moieties for an array of treatments, they have antibacterial, antifungal, antiinflammatory, antipyretic, diuretic, cardiovascular activities. Apart from these they also have anticancer activities. So, pertaining to its importance, many attempts are made to synthesize pyrazolines. Since conventional methods of organic synthesis are energy and time consuming. There are elaborate pathways for green and eco-friendly synthesis of pyrazoline derivatives including microwave irradiation, ultrasonic irradiation, grinding and use of ionic liquids which assures the synthesis of the same within much lesser time and by use of minimal energy

Sign in / Sign up

Export Citation Format

Share Document