Comparative study of the cationic surfactants and their influence on the alkaline hydrolysis of acetylsalicylic acid

Kumar, Birendra; Ghosh, Kallol K.; Dafonte, P. R.

doi:10.1002/kin.20515

Cited by 9 publications

(8 citation statements)

References 40 publications

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“…In view of these experimental data obtained for the absorption rate and compared to the physical absorption process, it may be assumed on the basis of previous studies which have analyzed the influence of micelles upon reaction rate [15], that the improvement observed on the absorption process where surfactant was present may be due to some influence of micelles upon the reaction rate between carbon dioxide and glucosamine. For that, studies about the diffusion of glucosamine molecules in systems with and without Tween80 were carried out.…”

Section: Resultsmentioning

confidence: 99%

Influence of a Second Liquid Phase upon Carbon Dioxide Chemical Absorption

Couvert

García-Abuín

Gómez‐Díaz

et al. 2013

International Journal of Chemical Reactor Engineering

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This work analyzes carbon dioxide mass transfer rate during chemical absorption from a gas phase to a liquid-liquid system based on an aqueous phase (glucosamine or pyrrolidine solutions) and an organic one. Two different kinds of silicone oil with different viscosity were used to perform the liquid phases, and it allows the analysis of the influence of this variable upon mass transfer rate. In these systems, a surfactant (Tween80) was added to stabilize the liquid-liquid system, and therefore, the influence of the presence of this surfactant in the liquid phase was studied. This substance produces a positive effect upon carbon dioxide absorption rate in glucosamine aqueous solutions, but the opposite effect was observed for the other amine employed in this work. Also, the influence caused by different operation variables, such as the gas flow-rate fed to the bubble contactor or the silicone oil concentration in the liquid phase, was studied.

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Section: Resultsmentioning

confidence: 99%

Influence of a Second Liquid Phase upon Carbon Dioxide Chemical Absorption

Couvert

García-Abuín

Gómez‐Díaz

et al. 2013

International Journal of Chemical Reactor Engineering

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“…This type of rate profile, i.e. the appearance of a rate maximum, for the hydrolysis reactions of various organic compounds in the presence of cationic surfactants, is well documented . These studies have suggested strongly that, in micellar media, most reactions take place on the surface of micelle at or near the highly charged double layer, commonly called, the Stern layer (Scheme ).…”

Section: Resultsmentioning

confidence: 91%

Influences of Micelle Formation and Added Salts on the Hydrolysis Reaction Rate of p‐Nitrophenyl Benzoate in Aqueous Buffered Media

Bayissa

Ohmae

Hojo

2016

Int J of Chemical Kinetics

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The hydrolysis reaction rate of p-nitrophenyl benzoate (p-NPB) has been examined in aqueous buffer media of pH 9.18, containing surfactants, cetyltrimethylammonium bromide (CTAB) and chloride (CTAC), or sodium dodecyl sulfate (SDS) at 35°C. Although the rate constant [log (k/s −1 )] of p-NPB hydrolysis has once decreased slightly below the critical micelle concentration (CMC) value for CTAB and CTAC, it has begun to increase drastically with micellar formation. With increasing concentrations larger than the CMC value, the log (k/s −1 ) value has reached the optimal value, i.e., a 140-and 200-fold rate acceleration for CTAB and CTAC, respectively, compared to that without a surfactant. Whereas the anionic surfactant, SDS, has caused only a gradual rate deceleration in the whole concentration range (up to 0.03 mol dm −3 ). Increases in pH of the buffer have resulted in increases of the hydrolysis rate. In the CTAB micellar solution, the remarkably enhanced rate has been retarded significantly by the addition of only 0.10 mol dm −3 bromide salts. The effects of rate retardation caused by the added salts follows in the order of NaBr > Me 4 NBr > Et 4 NBr > Pr 4 NBr > n-Bu 4 NBr. In the absence of surfactant, however, the addition of the bromide salts has accelerated the hydrolysis rate, except for the metallic salt of NaBr, with the order of Me 4 NBr < Et 4 NBr < Pr 4 NBr < n-Bu 4 NBr. In the CTAC micellar solution, similar rate retardation effects have been observed in the presence of chloride salts (NaCl, Et 4 NCl, and n-Bu 4 NCl). The effects of added salts have

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“…These results may be compared with experimental observations of the larger micellar binding constant of PSa -, (K S ) in CTABr (K S = 7000 M -1 ) than that in TTABr (K S = 3660 M -1 ) obtained under the same experimental conditions. Several studies have reported that for the surfactants of the same headgroups, decrease in hydrophobic chain length will decrease the values of micellar binding constant of substrate, K S [57][58][59]. Shorter hydrophobic chain length will cause a smaller aggregation number of micelles [60], which reflects the decrease in micellar size for the surfactant of the same head group [61].…”

Section: Resultsmentioning

confidence: 99%

Counterion‐Induced Cationic Flexible Nanoparticle Catalytic of Piperidinolysis of Phenyl Salicylate

Noh

Khalid

Ariffin

et al. 2017

J Surfact & Detergents

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The removal of PSa− from bulk aqueous phase to the pseudo‐micellar phase by halobenzoate counterion X is responsible for the monotonic increase in kobs (pseudo first‐order rate constants) with the increase in the values of [MX] where MX = sodium salts of 2‐, and 4‐halobenzoic acids. The values of ion exchange constants, KnormalXBr or RnormalXBr for X = 2‐ and 4‐halobenzoate ions in the presence of tetradecyltrimethylammonium bromide (TTABr) were calculated from the apparent catalytic rate constants, Xkcat which represent the catalytic effect of CFN. Larger values of KnormalXBr or RnormalXBr were observed for X = 4‐halobenzoate ions than that for X = 2‐halobenzoate ions due to isomeric factors. The values of KnormalXBr or RnormalXBr determined in the presence of TTABr were compared with previously determined KnormalXBr or RnormalXBr values in the presence of cetyltrimethylammonium bromide (CTABr). The values of KnormalXBr or RnormalXBr are nearly 8 ~ 9‐fold larger for 4‐IBz−, 4‐BrBz− and 4‐ClBz− compared to the respective values of X = 2‐IBz−, 2‐BrBz− and 2‐ClBz−. The values of KnormalXBr or RnormalXBr for X = 4‐FBz− is nearly 3‐fold larger than that for X = 2‐FBz−. The values of KnormalXBr or RnormalXBr for X = 2‐ and 4‐halobenzoates are significantly smaller in the presence of TTABr than these in the presence of CTABr nanoparticles.

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Comparative study of the cationic surfactants and their influence on the alkaline hydrolysis of acetylsalicylic acid

Cited by 9 publications

References 40 publications

Influence of a Second Liquid Phase upon Carbon Dioxide Chemical Absorption

Influence of a Second Liquid Phase upon Carbon Dioxide Chemical Absorption

Influences of Micelle Formation and Added Salts on the Hydrolysis Reaction Rate of p‐Nitrophenyl Benzoate in Aqueous Buffered Media

Counterion‐Induced Cationic Flexible Nanoparticle Catalytic of Piperidinolysis of Phenyl Salicylate

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