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9. Preparation of Carbon Molecular Sieves Used for CH4/N2 Separation

Author

Zhang Jinhua, Wang Peng, Qu Sijian, Li Xiaoliang, Che Yongfang, Lanting Li, and Xuefei Li

Subjects
General Chemical Engineering, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, General Chemistry, Chemical vapor deposition, 010402 general chemistry, 021001 nanoscience & nanotechnology, Molecular sieve, 01 natural sciences, 0104 chemical sciences, Pressure swing adsorption, chemistry.chemical_compound, Adsorption, chemistry, medicine, Deposition (phase transition), 0210 nano-technology, Benzene, Carbon, health care economics and organizations, Activated carbon, medicine.drug
Abstract

In this study, carbon molecular sieves (CMS) were prepared by chemical vapor deposition method using benzene as depositing agent based on activated carbon. The influences of deposition temperature, time, and flow rate of benzene on adsorption capacity and separation coefficient were investigated. The results show that the CH4 equilibrium adsorption capacity and CH4/N2 separation coefficient of CMS-G, which is prepared at the deposition temperature of 1023 K, time of 60 min, and flow rate of 4 mL·min–1, are at a maximum value (parametric investigation of this study is based on the parameter ranges in the text). The deposition temperatures had an obvious effect on the textural modification of CMS. CMS-G was characterized by mercury intrusion, CO2 permeation, analysis of kinetics, and pressure swing adsorption (PSA). Both kinetic and PSA results demonstrate a good CH4/N2 separation performance for the CMS-G. A very high kinetic selectivity was observed, which reached 35.26. An enrichment of 30.20% for methan...

Published
2018

10. Combustion characteristics of Inner Mongolia lignite semi-coke.

Author

ZHANG Qingwei, SHEN Baohong, QU Sijian, and XIE Qiang

Abstract

In order to use Wulagai lignite (Inner Mongolia) efficiently, taking -6 mm Wulagai lignite as raw material, the test prepared the Wulagai lignite semi-coke in muffle which was used to simulate the industrial carbonization furnace. Then the proximate analysis, calorific value, grindability indeX, combustion dynamics of semi-coke, relationship between pyrolysis condition and semi-coke combustion characteristics were researched. The results showed that, the final temperature of pyrolysis was the main influencing factor, the influence of heating rate and holding time ware not significant. The reaction activity of semi-coke improved with the rise of final temperature and heat preservation time, while the influence on combustion characteristics index was opposite. The semi-coke which was obtained at 600 °C pyrolysis had superior calorific value of 24.50 MJ/kg which was 77% higher than that of raw coal. The combustion characteristics index were 1.4 x 10-7%²/(min² ⋅ °³), the suitable fuel ratio R ranged from 7 to 9, which was a fine fuel. [ABSTRACT FROM AUTHOR]

Published
2014
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