570. Conductometric investigation of kinetics of reactions in 100% sulphuric acid. Part I. The decomposition of oxalic acid at 25°

1963 ◽  
Vol 0 (0) ◽  
pp. 3106-3113 ◽  
Author(s):  
M. Liler
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Kinetics Of

scholarly journals Kinetics of Manganese Oxides Dissolution in Sulphuric Acid Solutions Containing Oxalic Acid

Engineering ◽  
2013 ◽  
Vol 05 (09) ◽  
pp. 714-719 ◽  
Author(s):  
I. V. Artamonova ◽  
I. G. Gorichev ◽  
E. B. Godunov
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Manganese Oxides ◽  
Acid Solutions ◽  
Kinetics Of

The Role of Oxalic Acid in the Ozone Bleaching Kinetics of an Xo-Kraft Pulp

2000 ◽  
Vol 20 (2) ◽  
pp. 147-167 ◽  
Author(s):  
M. Blanca Roncero ◽  
José F. Colom ◽  
Teresa Vidal ◽  
M. [Agrave]ngels Queral
Keyword(s):  
Oxalic Acid ◽  
Kraft Pulp ◽  
Kinetics Of ◽  
Ozone Bleaching

The kinetics of corrosion of e-glass fibres in sulphuric acid

2010 ◽  
Vol 356 (44-49) ◽  
pp. 2433-2436 ◽  
Author(s):  
R.L. Jones ◽  
J. Stewart
Keyword(s):  
Sulphuric Acid ◽  
Glass Fibres ◽  
Kinetics Of

scholarly journals Kinetic Study of the Recovery of Phosphorus from Wastewater by Calcium Hydroxide Solution

2019 ◽  
Vol 25 (6) ◽  
pp. 19-29
Author(s):  
Shams Asem Mahdi ◽  
Raghad Fareed Qasim
Keyword(s):  
Oxalic Acid ◽  
Calcium Hydroxide ◽  
Phosphorus Concentration ◽  
Ambient Conditions ◽  
Residual Phosphorus ◽  
Mixing Speed ◽  
Dissolution Reaction ◽  
Best Value ◽  
Percentage Removal ◽  
Kinetics Of

This research presents a study for precipitating phosphorus (as phosphate ion) from simulated wastewater (5ppm initial concentration of phosphorus) using calcium hydroxide Ca(OH)2 solution. The removal of phosphorus by Ca (OH)2 solution is expected to be very effective since the chemical reaction is of acid-base type but Ca(OH)2 forms complex compound with phosphate ions called. Hydroxyapatite Ca5 (PO4)3OH. hydroxyapatite is slightly soluble in water. This research was directed towards sustainable elements as phosphorus. Kinetics of the dissolution reaction of hydroxyapatite was investigated to find the best factors to recover phosphorus. The effect of concentration of Ca(OH)2 (180- 380 ppm) on phosphorus precipitation on the outputs like the residual phosphorus concentration in the simulated solution, the percentage removal of phosphorus and the weight of the precipitate was also studied. The residual phosphorus decreased with increasing Ca(OH)2 concentration while the percentage removal, as well as the weight of the precipitate, increased with increasing Ca(OH)2 concentration at constant temperature and mixing speed. The best Ca(OH)2 concentration was obtained depending on the lowest amount of the residual phosphorus concentration. The best value obtained was 230 ppm at a fixed mixing speed of 400 rpm and a temperature of 20°C.  The best value for Ca(OH)2 concentration under fixed stirring speed and temperature was applied on a real wastewater taken from the detergent factory. The percentage removal was 30. 69% due to the complexity of the real sample. Oxalic acid was chosen to dissolve hydroxyapatite because it is an organic acid, less hazardous than mineral acids and of less cost. Kinetics of the dissolution reaction of hydroxyapatite in (160 ppm) concentration oxalic acid under ambient conditions (20°C and 1 atm (and mild stirring (200 rpm) was studied using the differential method for determining the order of the reaction which was 0.4296 and the rate constant 0.0743 (L/mg)-0.5704. min-1. The reaction was considered as a rate-controlled reaction.  

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