Article
Thermodynamics
Mingqiang Gao, Cheng Cheng, Zhenyong Miao, Keji Wan, Qiongqiong He
Summary: The surface functional groups and pore structures of lignite oxidized at temperatures below 190 degrees C were studied, and the kinetics and thermodynamics of lignite combustion were analyzed. The results indicate that oxidation damages the pore structure and combustion performance of lignite, and thus should be avoided during storage, while the pore structure of oxidized lignite can be adjusted to enhance its combustion performance.
Article
Thermodynamics
Yangguang Ren, Zhiqiang Xu, Suqian Gu
Summary: This study investigated the upgrading process of lignite using microwave energy with the assistance of lignite semi-coke. The results showed that microwave upgrading improved the coal quality of lignite and reduced the oxygen-containing functional groups. The adsorption conformation of dispersant on the upgraded lignite particles changed, resulting in improved slurry ability.
Article
Thermodynamics
Ying Xu, Jiming Wang, Guojie Zhang, Xiaodi Zhang, Xiaowei Qin, Yongfa Zhang
Summary: The study found that HTD upgrading treatment significantly affects lignite composition, oxygen-containing functional groups, and pore structure. The effective diffusion coefficient of moisture and activation energy for equilibrium moisture decrease with increasing temperature. The drying process of equilibrium water can be described by thin-layer dynamics model and the Arrhenius formula. There was a good linearity between oxygen content, pore structure, and moisture re-adsorption rate in the upgraded lignite. The re-adsorption rate of the upgraded lignite was influenced by oxygen-containing functional groups in the order of Ph-OH, COOH, C]O, and Ar-OH.
Article
Energy & Fuels
He Zhixiu, Liu Chenhui, Qu Wenwen, Jia Lijuan, Wang Fang, Gao Jiyun
Summary: This study investigated the dielectric properties of lignite using the resonant cavity perturbation method and explored the effects of temperature, particle size, moisture content, and microwave frequency. The results showed that the dielectric parameters exhibited distinct variations at different temperature ranges and were influenced by particle size and moisture content. The frequency of 915 MHz was found to be more appropriate for processing large amounts of lignite in high power industrial applications compared to 2450 MHz. Additionally, the micro-structure of lignite was analyzed, revealing the formation of pores and cracks due to microwave heating. These findings provide valuable insights for the microwave processing of lignite.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Energy & Fuels
Nuno Batalha, Ruben Checa, Chantal Lorentz, Pavel Afanasiev, Krzysztof Stanczyk, Krzysztof Kapusta, Dorothee Laurenti, Christophe Geantet
Summary: This study explores the relationship between hydrothermal liquefaction (HTL) crude oil composition and hydrotreatment (HDT) conversion. It was found that the composition differences of different crude oils determine the potential for producing hydrocarbon fuels, with HTL crude oils rich in aromatic compounds being more favorable for producing naphthenes and aromatic hydrocarbons, while crude oils richer in aliphatic carbon tend to yield paraffins. Additionally, the nature and concentration of heteroatom components also need to be considered.
Article
Engineering, Chemical
Mengdi Xu, Fangyu Guo, Youfei Zhang, Zili Yang, Yijun Cao, Xiahui Gui, Yaowen Xing
Summary: Hydrothermal pretreatment can enhance lignite flotation efficiency, especially at 200℃; however, excessive temperature might lead to decreased flotation recovery due to increased pore diameter and fine particle fraction.
Review
Environmental Sciences
Man Zhang, Xingyilong Zhang, Yingying Liu, Kejing Wu, Yingming Zhu, Houfang Lu, Bin Liang
Summary: Deep eutectic solvents (DES) are considered a new generation of green solvents due to their distinctive and tailorable physicochemical properties. They have been widely applied in various fields, and research focuses on the influence of molecular structure on DES properties and the latest research results in different areas. Developing DES with specific physicochemical properties from a molecular structure aspect is key to their accurate functional applications.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Chemical
Jianfeng Li, Yujie Yu, Rui Huang, Xianrui Yao, Yumu Tang, Yu He
Summary: A deep eutectic solvent (DES) synthesized by ChCl and ZnCl2 was used to improve hydrothermal dewatering (HD) by reducing moisture and oxygen content in lignite. The combustion performance of upgraded coals was greatly influenced by changes in physicochemical structure. Thermogravimetric analysis was conducted to investigate the effects of DES addition, upgrading temperature, and the molar ratio of ChCl and ZnCl2 on combustion performance. The results showed that DES addition shifted and delayed the combustion curves towards higher temperatures, indicating improved combustion reactivity and reduced spontaneous combustion tendency.
ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Guang-Hui Liu, Yu-Hong Kang, Yong Gao, Yan-Jun Li, Xiang-Rong Ma, Rui Dang, Long Yan, Wei-Wei Yan, Hong-Cun Bai, Zhi-Min Zong, Xian-Yong Wei
Summary: An in-situ and ex-situ cascade upgrade strategy was used to enhance the yield and value of soluble mixtures derived from Dahuangshan lignite, enabling the production and purification of clean liquid fuels.
Review
Chemistry, Physical
Faiznur Mohd Fuad, Masrina Mohd Nadzir, Azlina Harun-Kamaruddin
Summary: The principle of green chemistry is crucial in industrial processing of natural products, particularly in the extraction of bioactive compounds from plant sources. The use of natural deep eutectic solvents (NADES) has garnered attention as a potential replacement for conventional organic solvents and ionic liquids, due to their outstanding features that align well with green chemistry principles.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Coatings & Films
Eliza Ranjit, Stephen Hamlet, Robert M. Love
Summary: Wool-extracted keratin has been successfully coated onto titanium surfaces using two methods: molecular grafting and solvent casting. Both coated surfaces exhibited stable physiochemical and mechanical properties, making them suitable for potential dental and orthopaedic implant applications.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Faiznur Mohd Fuad, Masrina Mohd Nadzir
Summary: Eleven types of natural deep eutectic solvents (NADES) were synthesized using different hydrogen bond donors and acceptors. The synthesized NADESs showed stable liquid states and appropriate physicochemical properties. These findings are important for a better understanding and application of deep eutectic solvents.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Chaoxi Zeng, Yugang Liu, Zemin Ding, Huiping Xia, Shiyin Guo
Summary: This study focused on preparing hydrophobic deep eutectic solvent (HDES)-in-water nanoemulsions as potential antimicrobial delivery systems. By adjusting the components of HDES, the physicochemical properties and emulsification characteristics can be controlled, which in turn affect the antimicrobial activity of the nanoemulsions.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Biochemistry & Molecular Biology
Dorota Skowronska, Katarzyna Wilpiszewska
Summary: This paper describes the method of obtaining potato starch nanocomposites plasticized with a deep eutectic solvent, and investigates the effect of montmorillonite addition on the properties of potato starch films. The obtained nanocomposites showed improved mechanical and barrier properties.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Energy & Fuels
Xiaodong Yu, Zhenfu Luo
Summary: The study concludes that utilizing the differential dynamic field dry cascade separation bed can effectively desulfurize and reduce ash content of low-grade high-sulfur lignite, achieving high-efficiency desulfurization and ash reduction. The temporal and spatial migration and distribution law of material sulfur content in the cascade separation bed were studied, and the functional area of the separation bed was determined.
