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Experimental studies on gasification of the Shenmu coal char with CO2 at elevated pressures
Wang Mingmin,Zhang Jiansheng,Zhang Shouyu,Wu Jinhu,Yue Guangxi 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6
The gasification rates of Shenmu coal chars with CO2 were experimentally studied with a pressurized thermo- gravimetric analyzer (PTGA). Shenmu coal is a typical Chinese coal, and the coal char was prepared by a fixedbed reactor in nitrogen at 900 oC. The experiments were carried out in the dynamic heating segments from 750 oC to 1,000 oC, and the reaction pressure increased from 0.1MPa to 3.1MPa with pure CO2. The external diffusion resistances were minimized by increasing the flow rates and decreasing the thickness of sample layer before the test, to ensure the reactions were under kinetic control. The results show that the gasification rates increase proportionally to the 0.1 power of the CO2 partial pressure. The unreacted-core shrinking model was applied to predict the reaction rate by changing the molar fraction of CO2 at 0.6Mpa and 1.6Mpa total pressures, which showed a good match with experimental data.
Hao Guan Gui,Yun Sheng Ding,Yu Li,Shouyu Chen,Pei Xu,Bin Zheng 한국고분자학회 2014 Macromolecular Research Vol.22 No.6
Blends of poly(L-lactide) (PLLA) and a functional ionic liquid (IL), 3-methyl-1-(ethoxycarbonylethyl) imidazoliumtetrafluoroborate ([AOEMIm][BF4]) with various weight ratios were prepared by melt compounding andtheir interactions, compatibilities, processing characteristics, crystallization behaviors, mechanical properties and thermaldegradation were investigated in this study. The interaction between PLLA and [AOEMIm][BF4] was first studiedby infrared spectroscopy (IR) investigation, and then the Flory-Huggins interaction parameter between PLLA and[AOEMIm][BF4] was calculated. The compatibility was also supported by both sample appearance and scanning electronmicroscopy (SEM) results. Crystallization and melting conditions were obtained from differential scanning calorimetry(DSC), and the glass transition temperature (Tg) of PLLA showed a gradual decrease with the increasing addition of[AOEMIm][BF4]. The balancing torque data were obtained by Haaker torque rheometry, and the molecular weight data ofprocessed PLLA obtained by gel permeation chromatography (GPC) tests reflected a positive effect of [AOEMIm][BF4]on the melt-processing of PLLA. A strong increase of the mechanical parameters of PLLA, such as the elongation atbreak and the impact strength, was observed with the incorporation of [AOEMIm][BF4] up to the content of 7 phr (phris the abbreviation for parts per hundreds of resin, n phr denoted n g IL/100 g PLLA), while the tensile strength decreasedslightly. The thermal stability of PLLA took a sustained downward trend, with the increasing contents of [AOEMIm][BF4] inits matrices, as presented from thermogravimetric analysis (TGA). PLLA blended with 5 phr [AOEMIm][BF4] achievedexcellent overall performance; as well, the mechanical properties improved considerably, and damage to the thermal stabilitywas acceptable.