Kinetics of the Ortho—Pyro Interconversion in 100% Phosphoric Acid

1965 ◽  
Vol 69 (5) ◽  
pp. 1761-1762 ◽  
Author(s):  
Ronald A. Munson
Keyword(s):  
Phosphoric Acid ◽  
Kinetics Of

scholarly journals Study of the regularity of the process of decomposition of apatite with sulfuricacid at the boilingpoint of the solution

2019 ◽  
Vol 58 (4) ◽  
pp. 119-122
Author(s):  
Rauf F. Sabirov ◽  
◽  
Alexey F. Makhotkin ◽  
Yury N. Sakharov ◽  
Igor A. Makhotkin ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Phosphoric Acid ◽  
Boiling Point ◽  
Batch Reactor ◽  
Material Balance ◽  
Mercury Thermometer ◽  
Experimental Values ◽  
Kinetics Of ◽  
Liquid And Solid Phases ◽  
Phosphoric Acids

Experimental research of the kinetics of the decomposition process of Kovdorsky apatite with a size = 0.16 mm with sulfuric acid in a 1 dm3 batch reactor. Phosphoric acid with the concentration of 68.6 % wt and the sulfuric acid with the concentration of 12.3% wt in stoichiometric amount was introduces at the beginning of the process. The process was carried out at a ratio of liquid and solid phases 2.5:1 respectively at the boiling point of the mixture equal to 136 °C. The observing the progress was carried out according to the method of joint designation of sulfuric and phosphoric acids by titrimetric analysis. With methyl orange and then phenolphthalein 2 titration jumps were recorded, the first of which corresponded to the neutralization of sulfuric acid to Na2SO4 and phosphoric acid to NaH2PO4, the second to the neutralization of NaH2PO4 to Na2HPO4. The change in temperature of the reaction mixture was fixed during the process using a mercury thermometer. In the analysis of the derived experimental values of specified parameters that the boiling point decreases from 136 to 133.1 оС within 50 minutes during the process. A comparison of the reported values with the concentration values of sulfuric and phosphoric acids measured during the process shows that the change in boiling point of the reaction mixture is proportional to the change in the concentrations of sulfuric and phosphoric acids. This model is a closed system that provides thermal insulation and no loss of material balance. Thus, the kinetics of the decomposition of apatite with sulfuric acid at the boiling point can be monitored by the temperature change under specified conditions.

Pertraction of methylene blue using a mixture of D2EHPA/M2EHPA and sesame oil as a liquid membrane

2013 ◽  
Vol 67 (7) ◽  
Author(s):  
Pezhman Kazemi ◽  
Mohammad Peydayesh ◽  
Alireza Bandegi ◽  
Toraj Mohammadi ◽  
Omid Bakhtiari
Keyword(s):  
Methylene Blue ◽  
Phosphoric Acid ◽  
Liquid Membrane ◽  
Membrane Surface ◽  
Sesame Oil ◽  
Acetic Acid Concentration ◽  
Membrane Phase ◽  
Experimental Conditions ◽  
Feed Phase ◽  
Kinetics Of

AbstractAn experimental study on the pertraction of methylene blue (MB) through a supported liquid membrane (SLM) using a mixture of mono-(2-etylhexyl) ester of phosphoric acid (M2EHPA) and bis-(2-etylhexyl) ester of phosphoric acid (D2EHPA) and sesame oil as the liquid membrane (LM) was performed. Parameters affecting the pertraction of MB such as initial MB concentration, carrier concentration, feed phase pH, and stripping phase concentration were analyzed. Optimal experimental conditions for MB pertraction (permeability of 5.63 × 10−6) were obtained after a 7 h separation with the MB concentration in the feed phase of 80 mg L−1, D2EHPA/M2EHPA concentration in membrane phase of 40 vol. %, feed pH of 6, and acetic acid concentration in the stripping phase of 0.4 mol L−1. Kinetics of transport and stability of the SLM system were also studied and the mass transfer coefficient for this system was evaluated. Scanning electron microscopy (SEM) was used to morphologically characterize the membrane surface.

Kinetics of the anation of aquopentaamminecobalt(III) by phosphoric acid dihydrogenphosphate

1981 ◽  
Vol 49 ◽  
pp. 259-262 ◽  
Author(s):  
J.M. Coronas ◽  
R. Vicente ◽  
M. Ferrer
Keyword(s):  
Phosphoric Acid ◽  
Kinetics Of

The kinetics and mechanism of solvent extraction of Pr(iii) from chloride medium in the presence of two complexing agents with di-(2-ethylhexyl) phosphoric acid

RSC Advances ◽  
2015 ◽  
Vol 5 (60) ◽  
pp. 48659-48664 ◽  
Author(s):  
Shao-Hua Yin ◽  
Shi-Wei Li ◽  
Jin-Hui Peng ◽  
Li-Bo Zhang
Keyword(s):  
Lactic Acid ◽  
Citric Acid ◽  
Solvent Extraction ◽  
Phosphoric Acid ◽  
Interfacial Area ◽  
Kinetics And Mechanism ◽  
Complexing Agents ◽  
Extraction Kinetics ◽  
Chloride Medium ◽  
Kinetics Of

The extraction kinetics of Pr(iii) from chloride medium containing two complexing agents lactic acid (HLac) and citric acid (H3cit) with di-(2-ethylhexyl)phosphoric acid (D2EHPA, H2A2) have been investigated by constant interfacial area cell with lamina flow.

Sign in / Sign up

Export Citation Format

Share Document