Acid-base equilibriums of some acids in propylene carbonate

1977 ◽  
Vol 49 (3) ◽  
pp. 503-508 ◽  
Author(s):  
K. Izutsu ◽  
I. M. Kolthoff ◽  
T. Fujinaga ◽  
M. Hattori ◽  
M. K. Chantooni
Keyword(s):  
Propylene Carbonate ◽  
Acid Base

Acid-base titration in propylene carbonate

Polimery ◽  
1991 ◽  
Vol 36 (07/08/09) ◽  
pp. 342-344 ◽  
Author(s):  
DOROTA WILSON-POLIT ◽  
TERESA GAJEWSKA ◽  
EWA GORECKA
Keyword(s):  
Propylene Carbonate ◽  
Acid Base ◽  
Acid Base Titration

Acid-base interactions in the methanesulfonic acid-propylene carbonate system

1999 ◽  
Vol 48 (2) ◽  
pp. 312-317 ◽  
Author(s):  
V. D. Maiorov ◽  
G. I. Voloshenko ◽  
A. P. Kirilova ◽  
N. B. Librovich
Keyword(s):  
Propylene Carbonate ◽  
Methanesulfonic Acid ◽  
Acid Base ◽  
Carbonate System

scholarly journals Controllable Acid/Base Propriety of Sulfate Modified Mixed Metal Oxide Derived from Hydrotalcite for Synthesis of Propylene Carbonate

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 470 ◽  
Author(s):  
Zhongxie Ding ◽  
Wenlong Xu ◽  
Xingguang Zhang ◽  
Zhen Liu ◽  
Jiecan Shen ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Ir Spectra ◽  
Propylene Carbonate ◽  
Sample Surface ◽  
Ammonium Persulfate ◽  
Mixed Metal Oxide ◽  
Acid Base ◽  
Base Property ◽  
Mixed Metal ◽  
Ft Ir

Ammonium persulfate modified mixed metal oxide derived from hydrotalcite with tunable acid/base properties can be prepared via thermal decomposition of Mg-Al hydrotalcite-type precursors and ammonium persulfate. By controlling the ammonium persulfate content, these sulphur mutated samples, denoted as SMgAlO-y (y = 1; 3; 5; 7), were investigated in this research. The resulted materials were characterized by XRD, SEM, FT-IR spectra, Py-IR spectra, XPS, Hammett indicator, CO2-TPD, as well as NH3-TPD. Furthermore, the acid-base property of the sample surface was determined by inverse gas chromatography measurements (IGC). Among all the obtained outcomes, the target SMgAlO-5 demonstrated the maximal Ka/Kb value, and it presented the highest activity as a catalyst in the synthesis of propylene carbonate (PC) through 1,2-propylene glycol and urea, giving the yield of 97.2% at the optimized reaction condition, which indicated that the PC yield counted on the synergic effect of the acidity and basicity on catalysts.

scholarly journals A kinetic study of Zn halide/TBAB-catalysed fixation of CO2 with styrene oxide in propylene carbonate

2019 ◽  
Vol 8 (1) ◽  
pp. 719-729 ◽  
Author(s):  
Abdul Rehman ◽  
M.F.M. Gunam Resul ◽  
Valentine C. Eze ◽  
Adam Harvey
Keyword(s):  
Propylene Carbonate ◽  
Styrene Oxide ◽  
Activation Parameters ◽  
Green Solvent ◽  
Acid Base ◽  
First Order ◽  
First Order Kinetics ◽  
Thermodynamic Activation Parameters ◽  
Styrene Carbonate ◽  
Comprehensive Study

Abstract Synthesis of styrene carbonate (SC) via the fixation of CO2 with styrene oxide (SO) has been investigated using a combination of zinc bromide (ZnBr2) and tetrabutylammonium halides (TBAX) as acid-base binary homogeneous catalysts. The combination of ZnBr2 and TBAB had a synergistic effect, which led to about 6-fold enhancement in the rate of SC formation as compared to using TBAB alone as a catalyst. Propylene carbonate (PC) was chosen as a green solvent for a comprehensive study of reaction kinetics. The reaction followed a first-order kinetics with respect to SO, CO2, and TBAB, whereas a fractional order was observed for the ZnBr2 when used in combination with the TBAB. Arrhenius and Eyring’s expressions were applied to determine the kinetic and thermodynamic activation parameters, where activation energy (Ea) of 23.3 kJ mol−1 was obtained for the SC formation over the temperature range of 90-120°C. The thermodynamic analysis showed that positive values for enthalpy (ΔH‡ = 18.53 kJ mol−1), Gibbs free energy (ΔG‡ = 79.74 kJ mol−1), whereas a negative entropy (ΔS‡ = –162.88 J mol−1 K−1) was obtained. These thermodynamic parameters suggest that endergonic and kinetically controlled reactions were involved in the formation of SC from SO and CO2.

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