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RISS 인기검색어
- 검색키워드
- 저자 : Raju Thasan (검색결과 3 건)
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Thasan Raju,Sang Joon Chung,문일식 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4
The paper presents a process for the electrochemical recovery of silver(Ag) by electro deposition on the electrode surface from the waste solutions of Ag(Ⅰ)/Ag(Ⅱ) redox system in nitric acid medium used for the mediated electrochemical process. Electrochemical recovery was carried out in an undivided cell with DSA-O2 electrodes at room temperature condition. At an optimized current density of 12 A/d㎡, 99% of Ag recovery efficiency was achieved with high yield and low energy consumption. Experimental runs were made in order to observe the performance of the Ag recovery process. The operating conditions like current density, temperature and Ag(Ⅰ) concentration of the electrolyte, the acid concentrations, agitation rate and inter-electrode distance were optimized.
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Electrochemical bromination and oxidation of alkyl aromatic compounds by two-phase electrolysis
Raju Thasan,Kulangiappar Kumarasamy 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.3
A simple, regioselective, environmentally clean and economical method for the preparation of side chain/ring brominated aromatic compounds is reported in 70-98% yield by an electrochemical method using two phase electrolysistechnique. Electrochemical reactions were carried out using aqueous 25-50 wt% sodium bromide containingcatalytic amount (5 wt%) of hydrobromic acid as an aqueous phase and chloroform containing alkyl aromatic compoundsas an organic phase, at a temperature of 0-30 oC in an undivided cell. The same two-phase electrolytic system can beused for the oxidation of benzylic alcohols to the corresponding benzaldehydes in 80-94% yield without over oxidationto carboxylic acids. The advantage of this very mild procedure is a room temperature reaction used with an undividedcell. Excellent conversions are observed. After completion of alcohol oxidation the electrolyte can be reused for a numberof times, demonstrating “spent reagent” free electro organic reaction as an attractive one. In the case of side chain/ringbromination of alkyl aromatic compounds, the electrolyte can be reused after making up the concentration of the electrolytewith 47 wt% HBr solution. In some cases homogeneous electrolysis is applied, where the two-phase electrolysisdid not work. Styrene epoxidation and α-bromination of ketones underwent homogeneous electrolysis at room temperaturewithout any catalyst. The reaction was performed in CH3CN-water (3 : 2) using equimolar amount of NaBras an electrolyte to get 68% of styrene epoxide. Use of an ionic liquid 1-butyl 3-methyl imidazolium bromide (Bmim)Br, instead of NaBr improved the yield and current efficiency of styrene epoxide to 86%.
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문일식,Thasan Raju,Sang Joon Chung 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6
The objective of this work was to develop a process for removal of industrial waste gases like NO, NO2 and SO2 by electrochemically generated Ag(I)/Ag(II) redox mediator system in aqueous nitric acid medium. 100% removal efficiencies were achieved in these studies for removal of NOx and SO2 with Ag(II) ions in room temperature and atmospheric pressure. This Ag(I)/Ag(II) redox mediator system can be regenerated continuously during the scrubbing process.
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