Results 191 to 200 of about 41,757 (268)

Mesophase pitch-based high performance carbon fiber production using coal extracts from mild direct coal liquefaction

Carbon
Christina Thompson, George Frank, Vivian Edwards, Michela Martinelli, Asmund Vego, Frederic Vautard, Ercan Cakmak, John Craddock, Mark Meier, Rodney Andrews, M. Weisenberger   +10 more
semanticscholar   +3 more sources

Techno-economic analysis of a solar thermochemical cycle-based direct coal liquefaction system for low-carbon oil production

Energy, 2022
Direct coal liquefaction turns solid coal into transportable liquid fuel with a high energy conversion efficiency of nearly 60%. However, the hydrogen used in the direct coal liquefaction process mainly comes from coal gasification units, and ...
Hui Kong, Jian Wang, Hongfei Zheng, Hongsheng Wang, Jun Zhang, Zhufeng Yu, Zheng Bo   +6 more
semanticscholar   +1 more source

A coal constituent based kinetic model for direct coal liquefaction

International Journal of Hydrogen Energy
Xizhuang Qin, Tao Shen, Guanbo Li, Lei Shi, Zhenyu Liu, Qingya Liu   +5 more
openaire   +2 more sources

Ignition characteristics of an alternative kerosene from direct coal liquefaction and its blends with conventional RP-3 jet fuel

, 2021
Jet fuel from direct coal liquefaction (DCL) is an important alternative kerosene. The study of its ignition characteristics is not only critical for the development of combustion kinetic models, but also is valuable to evaluate its compatibility in ...
Zhi-yuan Yang, P. Zeng, Bi-Yao Wang, W. Jia, Zuojun Xia, Jinhu Liang, Quan‐De Wang   +6 more
semanticscholar   +1 more source

An approach for upgrading lignite to improve slurryability: Blending with direct coal liquefaction residue under microwave-assisted pyrolysis

, 2021
As the composition of direct coal liquefaction residue (DCLR) is complex and difficult to handle, more importantly its dielectric properties are excellent, it is used as consumable wave-absorbents to enhance the microwave pyrolysis of lignite for ...
Suqian Gu, Zhiqiang Xu, Yangguang Ren, Yanan Tu, M. Sun, Xiang-Xue Liu   +5 more
semanticscholar   +1 more source

Direct Coal Liquefaction

1983
This paper presents a brief state of the art review of direct coal liquefaction. The review includes important pilot scale processes available for the liquefaction an a brief description of the structure of coal and the chemistry, mechanism and available lumped kinetic models for the liquefaction process.
Y. T. Shah, P. C. Singh, A. Calimli
openaire   +1 more source

Catalyst deactivation during direct coal liquefaction: a review

Industrial & Engineering Chemistry Product Research and Development, 1984
A review of R and D in catalytic direct liquefaction has shown that catalyst lifetime is more important than initial activity. Deactivation studies indicate that contamination by 20-30 wt% carbonaceous material and 2-8 wt% inorganics results in deactivation best described by the shell progressive deactivation mechanism. Metals contamination is confined
D Thakur, M Thomas
openaire   +1 more source

Improvements in direct coal liquefaction using beneficiated coal fractions

Geological Society, London, Special Publications, 1997
Abstract Beneficiated coal fractions from Point of Ayr coal (North Wales) were liquefied in order to determine their effect on conversion, product and metal distribution in coal extract solutions. The coal fractions were obtained in a dense medium cyclone separation unit, using aqueous solutions of Ca(NO 3
J. Barraza, M. Cloke, A. Belghazi
openaire   +1 more source

The viscosity and crystallization behavior of slag from co-gasification of coal and extraction residue from direct coal liquefaction residue at high temperatures

, 2021
Co-gasification of coal and extraction residue (ER) of direct coal liquefaction residue (DCLR) is an efficient route for DCLR utilization. The synthetic ash samples of different composition were designed to investigate the crystallization of slag and its
Haoyuan Lu, B. Peng, Zefeng Ge, J. Bai, Lingxue Kong, Huai-zhu Li, Zhen Liu, Zongqing Bai, W. Li   +8 more
semanticscholar   +1 more source

The Coal Geochemistry in Direct Coal Liquefaction Technique

2007
The coal geochemistry in direct coal liquefaction deals with two factors as following: the reactivity of organic material such as macerals in coal, which will affect the oil yield of the coal liquefaction. The other is the geochemical transmition of metal elements, which will do harm to the environment if not take attention to.
Xiaohong Xia, Yong Qin, Yanyan Wu, Weifeng Yang   +3 more
openaire   +1 more source