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RISS 인기검색어
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- 저자 : Weize Wu (검색결과 3 건)
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Complete conversion of cellulose to water soluble substances by pretreatment with ionic liquids
Weina Liu,Weize Wu,Yucui Hou,Shuhang Ren,Wenhua Wang 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.10
Pretreatment of cellulose to water soluble substances (WSS) can enhance its efficient conversion in water solvent, such as ethanol fermentation. In this work, we found ionic liquid (IL), 1-methyl-3-methylimidazolium dimethylphosphate ([Mmim][DMP]), could convert efficiently cellulose to obtain WSS, and the product WSS and IL mixture could be separated by ethanol anti-solvent way. Effects of ILs, time, temperature and water on cellulose conversion were investigated. NMR, FTIR, XRD and SEM were employed to study the mechanism of cellulose conversion with ILs. The results indicate that [Mmim][DMP] has a greater ability to interact with cellulose than [Bmim][Cl] under the same conditions. Cellulose can be completely converted into WSS in [Mmim][DMP] under all the investigated temperatures from 140 to 160 oC. Increasing temperature is beneficial to the conversion rate of cellulose. But the presence of water can decrease the conversion rate of cellulose. During the treatment by [Mmim][DMP], the hydroxyls of cellulose can form hydrogen bonds with both anion and cation of [Mmim][DMP], and after the treatment the inter- and intramolecular hydrogen bonds of cellulose and the compact structure of cellulose are collapsed.
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Absorption of SO2 at High Temperatures by Ionic Liquids and the Absorption Mechanism
Shidong Tian,Yucui Hou,Weize Wu,Shuhang Ren,Jianguo Qian 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.9
The capture of SO2 at or close to the temperatures of real flue gas is much more attractive in application. In this work, two kinds of ionic liquids (ILs) based on lactate anion were used to absorb SO2 at high temperatures from 100 to 120 oC. The ILs show high absorption capacities of over one mol SO2 per mol IL at 110 oC. The absorption of SO2 by the ILs based on lactate anion is reversible and the ILs can be reused for the capture of SO2 at high temperatures with high absorption capacity and thermal stability. Furthermore, the absorption mechanism of SO2 by the ILs was studied by FT-IR, 1H NMR and 13C NMR spectra. It has been found that there are strong chemical interactions between the ILs and SO2. Also the absorption mechanism is different when there is water present in ILs compared to when there is not.
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Absorption of SO<sub>2</sub> at High Temperatures by Ionic Liquids and the Absorption Mechanism
Tian, Shidong,Hou, Yucui,Wu, Weize,Ren, Shuhang,Qian, Jianguo Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.9
The capture of $SO_2$ at or close to the temperatures of real flue gas is much more attractive in application. In this work, two kinds of ionic liquids (ILs) based on lactate anion were used to absorb $SO_2$ at high temperatures from 100 to $120^{\circ}C$. The ILs show high absorption capacities of over one mol $SO_2$ per mol IL at $110^{\circ}C$. The absorption of $SO_2$ by the ILs based on lactate anion is reversible and the ILs can be reused for the capture of $SO_2$ at high temperatures with high absorption capacity and thermal stability. Furthermore, the absorption mechanism of $SO_2$ by the ILs was studied by FT-IR, $^1H$ NMR and $^{13}C$ NMR spectra. It has been found that there are strong chemical interactions between the ILs and $SO_2$. Also the absorption mechanism is different when there is water present in ILs compared to when there is not.
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