Sonochemical synthesis of peracetic acid in a continuous flow micro-structured reactor

Jolhe, Prashant D.; Bhanvase, Bharat A.; Patil, Vijay S.; Sonawane, Shirish H.

doi:10.1016/j.cej.2015.04.054

Cited by 30 publications

(16 citation statements)

References 25 publications

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“…As illustrated in Figure 4, the consumption of hydrogen peroxide remains at a similar level for all three experiments, which confirms that there is no hydrogen peroxide decomposition with the application of ultrasound, but the decrease in hydrogen peroxide concentration is caused by double bond epoxidation. Additionally, Jolhe et al 25 claimed that the collapse of bubbles produced by the ultrasound irradiation results in the generation of very high local temperatures and pressures which form radicals ( • OH and • H) from water, which leads to the formation of hydrogen peroxide. However, no evidence of this was found for our ultrasound experiments.…”

Section: Kinetic Results and Discussionmentioning

confidence: 99%

“…This evidences a change in the catalyst properties, which was not observed in the reference experiments with water only. Jolhe et al 25 studied the synthesis of peracetic acid under ultrasound irradiation with Amberlite IR-120 and found evidence of remarkable catalyst deactivation. They attributed the deactivation toamong other factorsneutralization of the sulfonic acid groups, catalyst shrinkage or loss in pore sites.…”

Section: Kinetic Results and Discussionmentioning

confidence: 99%

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Prilezhaev epoxidation of oleic acid in the presence and absence of ultrasound irradiation

Aguilera

Hämäläinen

Eränen

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Epoxidation of double bonds in vegetable oils provide valuable green intermediates for the chemical industry. The epoxidation of oleic acid with hydrogen peroxide according to the Prilezhaev principle was studied experimentally in a multiphase laboratory-scale batch reactor operated isothermally at 50°C and atmospheric pressure. A solid cation exchanger (Amberlite IR-120) was used as the solid catalyst to enhance the slow step in the Prilezhaev process: the in situ formation of the epoxidation agent, peracetic acid, from hydrogen peroxide and acetic acid. A rotating basket stirrer was used to suppress the external mass transfer limitations and to guarantee a turbulent random flow in the vicinity of the catalyst particles. Kinetic experiments demonstrated the catalytic effect of the cation exchanger. Several experiments were performed in the presence and absence of ultrasound irradiation at different amplitudes. RESULTS:The exposure of ultrasound irradiation on the multiphase reaction mixture impaired the conversion of the double bonds and the yield of the epoxide, compared to a reference experiment conducted under silent conditions. Catalyst characterization by scanning electron microscopy and the determination of the acid sites in recycled catalyst samples confirmed that the main reason for deactivation was leaching and/or neutralization of the sulfonic acid groups from the solid catalyst matrix. CONCLUSIONS:The application of ultrasound at different input powers resulted in lower reaction yields compared to the silent reference experiment. This observation was attributed to deactivation of the catalyst caused by leaching and/or neutralization of the sulfonic groups promoted by ultrasound exposure.

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Section: Kinetic Results and Discussionmentioning

confidence: 99%

Section: Kinetic Results and Discussionmentioning

confidence: 99%

Prilezhaev epoxidation of oleic acid in the presence and absence of ultrasound irradiation

Aguilera

Hämäläinen

Eränen

et al. 2021

J of Chemical Tech & Biotech

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show abstract

“…The concentration of PAA formed in first, second, and third cycles of catalyst was observed to be 3.375, 2.975 and 2.145 mol/L, respectively, at the end of 50 min of the experimental run. The possible reasons for the deactivation of the Amberlite IR-120H catalysts are neutralization of the sulfonic acid groups, catalyst shrinkage, or loss in pore sites [23][24][25]. In presence of ultrasonic irradiation, as all the catalyst particles remains suspended in the reaction media, the availability of active sites of catalysts can be considered as significantly enhanced.…”

Section: Deactivation Of Catalyst In Batch Reactormentioning

confidence: 99%

Sonochemical Formation of Peracetic Acid in Batch Reactor: Process Intensification and Kinetic Study

Jolhe¹,

Bhanvase²,

Mardikar³

et al. 2020

Sonochemical Reactions

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The present chapter highlights the kinetic studies for the sonochemical synthesis of peracetic acid (PAA) in a batch reactor. The effect of different operating parameters including acetic acid to hydrogen peroxide molar ratio, temperature, catalyst loading, effect of ultrasound, were studied using Amberlite IR-120H as a catalyst. The deactivation of the Amberlite IR-120H catalyst has also been studied. The experimental data were further utilized for the estimation of intrinsic reaction rate constants and equilibrium constants. From the experimental results; the optimized PAA concentration was observed for 471 mg/cm 3 catalyst loading at 40°C with acetic acid to hydrogen peroxide molar ratio equals to 1:1 in the presence of ultrasound. Results also revealed that the reaction rate was found to be significantly enhanced in the presence of ultrasound, which can be attributed to the enhanced mixing and in-situ formation of H 2 O 2 . The use of ultrasound drastically reduces the overall reaction time to 60 min, which is very less compared to 30 h as reported for conventional batch reactor utilizing H 2 O 2 only.

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“…Fig. 3 describes the effect of HP to PA molar ratio from 1: 0.75 to 1: 1.25 [25,26] for the synthesis of PPA at 50 °C and 10 mol % catalyst loading based on PA at a total flow rate from 5 to 72 mL/h (residence time of 12 min to 50 s). Generally, for any tubular reactor / plug flow reactor, the residence time is the ratio of volume of the reactor to the volumetric flow rate to the reactor.…”

Section: Effect Of Hydrogen Peroxide Concentration On Ppa Synthesismentioning

confidence: 99%

Process Intensification by Using a Helical Capillary Microreactor for a Continuous Flow Synthesis of Peroxypropionic Acid and Its Kinetic Study

Maralla

Sonawane

2019

Period. Polytech. Chem. Eng.

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Peroxypropionic acid (PPA) is an important organic chemical compound. Due to its versatile oxidizing properties, it is used in the oil, chemical and other industries. In this article, an attempt was made for the production of PPA in a Teflon helical capillary microreactor without and with homogeneous catalyst. The article reports the perhydrolysis of PPA with the effect of various parameters such as concentration of hydrogen peroxide, molar ratio of reactants, radius of curvature of the microreactor, concentration of catalyst and temperature. The reaction is slow, as the PPA equilibrium was found to be reached within 10 min at a temperature of 50 °C and at 10 mol % catalyst loading based on propionic acid. The reaction was carried out in 13.25 and 23.25 mm radius of curvature of the microreactor in which 4.0375 and 3.488 mol/L concentrations of PPA respectively were obtained at 50 ºC and 10 mol % catalyst. It indicates that as radius of curvature decreases, better mixing was provided among the reactants for the reaction to give enhanced yield and selectivity. From the experimental data and the kinetic expressions, the expressions of activation energies and reaction rate constants were determined. For PPA synthesis and hydrolysis, the activation energies were 43.897 and 20.658 kJ/mol respectively without catalyst, while the activation energies for both the cases were 42.314 and 17.514 kJ/mol respectively with catalyst of 10 mol% based on propionic acid. The dean number, curve tube friction factor and pressure drop also determined for the helical capillary microreactor.

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Sonochemical synthesis of peracetic acid in a continuous flow micro-structured reactor

Cited by 30 publications

References 25 publications

Prilezhaev epoxidation of oleic acid in the presence and absence of ultrasound irradiation

Prilezhaev epoxidation of oleic acid in the presence and absence of ultrasound irradiation

Sonochemical Formation of Peracetic Acid in Batch Reactor: Process Intensification and Kinetic Study

Process Intensification by Using a Helical Capillary Microreactor for a Continuous Flow Synthesis of Peroxypropionic Acid and Its Kinetic Study

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