Experimental Study of Supercritical Ethanol Deoxygenation of Shengli Lignite
Zhou Jianming,
Hu Xiuxiu,
Wang Yiwei,
Rao Tianxi,
Xu Deping
Issue:
Volume 6, Issue 6, November 2018
Pages:
121-125
Received:
24 October 2018
Accepted:
20 November 2018
Published:
24 December 2018
DOI:
10.11648/j.ajche.20180606.11
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Abstract: In this study, supercritical ethanol process is employed to remove the oxygen-containing functional groups in lignite and the effects of temperature, residence time and ethanol /coal mass ratio on the deoxygenation were systematically investigated. Specifically, the solid and liquid products after supercritical ethanol deoxygenation were characterized by FT-IR and GC/MS. Considering the deoxygenation rate (61.40%) and solid yield (89.62%), the optimal deoxygenation was achieved at 270°C with the residence time of 90 mins and alcohol/coal mass ratio of 5:1. In the liquid products generated at 220°C, the content of aromatic compounds was about 80% while the content of phenols and ester compounds was less than 5%. However, for the liquid products obtained at 270°C, the content of aromatic compounds was decreased by 31.69 % while the volume fraction of O-containing compounds was increased by 2.81 % and the content of phenols and ester compounds was increased to about 35%. During supercritical ethanol process, ether oxygen bonds were cracked. For the O-containing species in the products, phenol and its derivatives were the main components in solid products and esters (mostly ethyl esters) in liquid products.
Abstract: In this study, supercritical ethanol process is employed to remove the oxygen-containing functional groups in lignite and the effects of temperature, residence time and ethanol /coal mass ratio on the deoxygenation were systematically investigated. Specifically, the solid and liquid products after supercritical ethanol deoxygenation were characteri...
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Kinetic Modelling of the Biosorption of Methylene Blue onto Wild Melon (Lagenariasphaerica)
Okon Ebi Ebi,
Ademiluyi Falilat Taiwo,
Adepoju Tunde Folorunsho
Issue:
Volume 6, Issue 6, November 2018
Pages:
126-134
Received:
6 June 2018
Accepted:
26 June 2018
Published:
10 January 2019
DOI:
10.11648/j.ajche.20180606.12
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Abstract: The Kinetics of the Biosorption of Methylene Blue onto LagenariaSphaerica as adsorbent was studied and the plant was characterized to check it suitability to be used as adsorbent for the treatment of aqueous waste water. The LagenariaSphaerica used was sliced into small sizes, sun dried for 14 days and later oven dried at 105°C for 2 hours to archive bone dryness, it was ground and sieved to various particle sizes and Batch adsorption process was employed. For the study. The effect of process parameters such as Effect of contact time, adsorbent dose, initial concentration of methylene Blue and particle size were investigated. The highest dye uptake stood at 90.1% after 24 hours using an initial dye concentration of 100 ppm and adsorbent dosage of 0.3 g. The experimental data obtained was fitted into adsorption isotherms such as Langmuir and freundlich isotherm model. It was described using linear regression method. Pseudo-first order, pseudo- second order and intra-particle diffusion kinetic models was used to analyze the Experiment. The data best fitted in intra-particle diffusion model and Freundlich isotherm. Considering the result obtained, it can confidently be said that Lagenariasphaerica can be used as an adsorbent for the removal of dye from aqueous solution.
Abstract: The Kinetics of the Biosorption of Methylene Blue onto LagenariaSphaerica as adsorbent was studied and the plant was characterized to check it suitability to be used as adsorbent for the treatment of aqueous waste water. The LagenariaSphaerica used was sliced into small sizes, sun dried for 14 days and later oven dried at 105°C for 2 hours to archi...
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