Effect of Ultrasound on the Production Reaction Kinetics of Sodium Thiosulfate

Abstract

It is known that the production reaction of sodium thiosulfate which consists of the reaction of Na 2 SO 3 with sulfur is considerably slow. Ultrasound energy was used to increase the conversion fraction of sulfur and to accelerate the production reaction of Na 2 S 2 O 3 , and the effect of ultrasonic energy on the reaction kinetics was investigated. The particle size, reaction temperature, concentration of Na 2 SO 3 solution and amplitude of ultrasound power were chosen as parameters. The experiments were performed in the absence and presence of ultrasound. Considering the results the reaction is chemically controlled first order and the activation energy is equal to 42 kJ/mol in both cases. The results indicated that the ultrasound energy increased the reaction speed but it did not vary the activation energy. The effect of ultrasound is on the pre-exponential factor A. Finally, an empirical relation is given which relates the rate constant to ultrasound power.

Marine shell industrial wastes–an abundant source of chitin and its derivatives: constituents, pretreatment, fermentation, and pleiotropic applications-a revisit

“…The cavitation effect might improve the penetration power of alkaline or acid solution, and it could be probably reason for the high yield within short period. Ingeç and Tekin (2004) reported that the ultrasonication increases the reaction speed by increasing the effective area of reaction. However, the frequency, energy, and processing time have to be optimized to get a better quality of chitin, which can be a new avenue for the further exploration.…”

Effect of ultrasound power on HCl leaching kinetics of impurity removal of aphanitic graphite

“…(2) , a faster k can be obtained by an increase in the A value or a decrease in the E a value. For ultrasound-assisted leaching, several researchers have reported that the ultrasound treatment enhanced the rate constant of the chemical reaction by a significant increase in A [ [72] , [73] , [74] , [75] , [76] , [77] ]. Thus, the increase in the reaction rate constant for ultrasound-assisted leaching was obtained by a huge increase in A .…”

Photocatalytic Degradation Kinetics of Congo Red dye in a Sonophotoreactor with Nanotube TiO2

“…the dyestuffs can be removed faster and more readily from waste water. Using kinetic models, various studies have described the effect of ultrasound powers within the modified activation energy equations [30]. This study used the following modified activation energy equation to interpret the effect of ultrasound energy on the reaction.…”