scholarly journals Liquid-liquid equilibrium constant for acetic acid in an olive oil-epoxidized olive oil-acetic acid-hydrogen peroxide-water system

2016 ◽  
Vol 70 (2) ◽  
pp. 165-175 ◽  
Author(s):  
Milovan Jankovic ◽  
Olga Govedarica ◽  
Snezana Sinadinovic-Fiser ◽  
Jelena Pavlicevic ◽  
Vesna Teofilovic ◽  
...  

The liquid-liquid equilibrium constant for acetic acid in a quinary system olive oil-epoxidized olive oil-acetic acid-hydrogen peroxide-water was experimentally determined for temperatures and component ratios relevant for in situ epoxidation of plant oils. The values has the constant range from 1.52 to 2.73. To predict the equilibrium constant for acetic acid, the experimental data were correlated with UNIQUAC (universal quasi chemical) and NRTL (non-random two liquid) activity coefficient models. For simplified calculation of the phase equilibrium the insolubility of olive oil and epoxidized olive oil in the water, as well as insolubility of water and hydrogen peroxide in the olive oil and epoxidized olive oil, was assumed. The root mean square deviation (RMSD) of the experimental and calculated values of the liquid-liquid equilibrium constant for acetic acid is 0.1910 for the UNIQUAC model and 0.1815 for the NRTL model. For rigorous flash calculation, when the partitioning of all components between the phases was assumed, the RMSD for the NRTL model is 0.1749.

1979 ◽  
Vol 57 (9) ◽  
pp. 1078-1082
Author(s):  
Annette Chappet ◽  
Martine Deschamps-Mudry ◽  
Dominique Job

Contrary to indole-3-acetic acid, indole-1-acetic acid (I1AA) may be destroyed by horseradish isoperoxydase ‘c’ (HRPc) only in the presence of hydrogen peroxide. This peroxidative reaction depends on the enzyme and H2O2 concentrations and on the medium acidity. By calculation of the binding equilibrium constant of the HRPc–I1AA complex for different pH, it appears that enzyme affinity for this substrate is higher for the more acidic tested pH.


2018 ◽  
Vol 461 ◽  
pp. 8-14 ◽  
Author(s):  
Junhuan Ding ◽  
Adam S. Klett ◽  
Jordan A. Gamble ◽  
Graham W. Tindall ◽  
Mark C. Thies

Netsu Bussei ◽  
2015 ◽  
Vol 28 (4) ◽  
pp. 166-172 ◽  
Author(s):  
Kouich TAKAKURA ◽  
Iwao SUMOGE ◽  
Sadao ARAKI ◽  
Hideki YAMAMOTO

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