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Pressured Microwave-assisted Hydrolysis of Crude Glycyrrhizic Acid for Preparation of Glycyrrhetinic Acid
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作者 王仁敏 林婵 +3 位作者 刘晶靓 余方 高建培 潘学军 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第1期152-157,共6页
A pressured microwave-assisted hydrolysis (PMAH) technique has been developed for hydrolyzing the crude glycyrrhizic acid (GA) extracted from licorice root to prepare glycyrrhetinic acid (GRA). In order to optim... A pressured microwave-assisted hydrolysis (PMAH) technique has been developed for hydrolyzing the crude glycyrrhizic acid (GA) extracted from licorice root to prepare glycyrrhetinic acid (GRA). In order to optimize the efficiency of PMAH, several experimental parameters were investigated, including liquid-solid ratio, hydrolysis time, sulfuric acid concentration and hydrolysis temperature. The optimized hydrolysis conditions were as follows:pressured microwave-assisted hydrolysis of crude GA for 21 min (taking 15 min to reach 150 ℃, and holding it for 6 rain) at 150 ℃ (at a radiation power of 450 W) in 3%-5% sulfuric acid solution with the liquid-solid (ml.g-1 crude GA) ratio of 25 : 1. As a result of the considerable saving in time and higher product yields (up to 90%), PMAH was proved more effective than conventional methods. 展开更多
关键词 glycyrrhetinic acid glycyrrhizic acid licorice root pressured microwave-assisted hydrolysis highperformance liquid chromatography
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Pressure Hydrolysis for Degradation of Omethoate Pesticide in Water
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作者 Robina FAROOQ 林逢凯 +3 位作者 王郁 黄建军 胥峥 S. F. SHAUKAT 《Journal of Shanghai University(English Edition)》 CAS 2004年第2期221-226,共6页
The effect of pressure on the hydrolysis rates and the degradation kinetics of environmentally persistent omethoate pesticide was studied. The results showed that the values of k obs increased and the values of activa... The effect of pressure on the hydrolysis rates and the degradation kinetics of environmentally persistent omethoate pesticide was studied. The results showed that the values of k obs increased and the values of activation volume (AV) decreased with increasing pressure. Among pH conditions (3.58, 6.01 and 8.5), pH 8. 5 was found to be the unstable condition and its half-life was reduced from 263 min at 1 atm to 19.37 min at 10 atm. These results describe that high-pressure hydrolysis is a useful technique for the conversion of toxic organic phosphorus into inorganic phosphorus. Key words pressure hydrolysis - organophosphorus pesticide - degradation 展开更多
关键词 pressure hydrolysis organophosphorus pesticide DEGRADATION
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