Browsing by Author Vu, Minh Duc

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  • Authors: Nguyen, Thị Thuy; Nguyen, Thanh Liem; Vu, Minh Duc (2018)

  • By performing the reaction for one hour at three different temperatures, the thermodynamic properties of the epoxidation reaction using tungstate-based catalyst of RSO and eRSO were determined. The rate constant of these epoxidation reactions were varied from 0.57.10-2 to 1.01.10-2 l.mol-1.s-1 with RSO and 0.97.10-2 to 1.76.10-2 l.mol-1.s-1 with eRSO. The activated energies of reaction were 6.2 and 6.6 kcal.mol-1, respectively. The enthalpy ΔH was positive indicating that the epoxidation process was a endothermic reaction, but the free-energy ΔF was also positive, so there was a specific temperature at which the epoxidation process was the most effective. Experimental results showed t...

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  • Authors: Nguyen, Thi Thuy; Vu, Minh Duc; Nguyen, Thanh Liem (2017)

  • Hydroxyl and oxirane functionality were calculated from molecular weight and hydroxyl or oxirane-oxygen content of polyol. The effect of reaction parameters like the amount of reagents, catalyst, temperature and time on a polyol synthesis was studied through the hydroxyl and oxirane functionality of product. Moreover, the impact of the parameters on the selectivity of catalyst was determined by comparing a polyol yield to an epoxide ring opening yield. When the hydroxylation reaction was carried out with ESO:H2O molar ratio of 1:15; in 8 wt.% of H2SO4; at temperature of 70oC and in 5 hours, the polyol yield of reaction was 70.32% and the hydroxyl functionality of polyol reached to...

Browsing by Author Vu, Minh Duc

Jump to: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
or enter first few letters:  
Showing results 1 to 2 of 2
  • item.jpg
  • Article


  • Authors: Nguyen, Thị Thuy; Nguyen, Thanh Liem; Vu, Minh Duc (2018)

  • By performing the reaction for one hour at three different temperatures, the thermodynamic properties of the epoxidation reaction using tungstate-based catalyst of RSO and eRSO were determined. The rate constant of these epoxidation reactions were varied from 0.57.10-2 to 1.01.10-2 l.mol-1.s-1 with RSO and 0.97.10-2 to 1.76.10-2 l.mol-1.s-1 with eRSO. The activated energies of reaction were 6.2 and 6.6 kcal.mol-1, respectively. The enthalpy ΔH was positive indicating that the epoxidation process was a endothermic reaction, but the free-energy ΔF was also positive, so there was a specific temperature at which the epoxidation process was the most effective. Experimental results showed t...

  • document(16).pdf.jpg
  • Article


  • Authors: Nguyen, Thi Thuy; Vu, Minh Duc; Nguyen, Thanh Liem (2017)

  • Hydroxyl and oxirane functionality were calculated from molecular weight and hydroxyl or oxirane-oxygen content of polyol. The effect of reaction parameters like the amount of reagents, catalyst, temperature and time on a polyol synthesis was studied through the hydroxyl and oxirane functionality of product. Moreover, the impact of the parameters on the selectivity of catalyst was determined by comparing a polyol yield to an epoxide ring opening yield. When the hydroxylation reaction was carried out with ESO:H2O molar ratio of 1:15; in 8 wt.% of H2SO4; at temperature of 70oC and in 5 hours, the polyol yield of reaction was 70.32% and the hydroxyl functionality of polyol reached to...