Double Decomposition Reactions for the Production of Alkaline and Alkaline-Earth Oleic Soaps under Salting-Out Conditions

Poulenat, Gaëlle; Sentenac, and Sabine; Mouloungui, Zéphirin

doi:10.1021/ie030508l

Cited by 15 publications

(13 citation statements)

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“…From Bragg's law, the bilayer distance was found as 4.0 nm, which corresponds to a 27°chain tilt angle. LB films of other metal soaps such as ZnSt 2 13 and zinc arachidate 8 had a 31°chain tilt angle which is comparable to that found for CaSt 2 in the present study.…”

Section: Precipitation Processsupporting

confidence: 87%

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Preparation and Characterization of Calcium Stearate Powders and Films Prepared by Precipitation and Langmuir−Blodgett Techniques

Gönen

Ozturk

Balköse

et al. 2010

Ind. Eng. Chem. Res.

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The preparation of calcium stearate (CaSt 2 ) using precipitation and Langmuir-Blodgett techniques was investigated in this study. While sodium stearate and calcium chloride were used in the precipitation process, calcium stearate nanofilms were produced from stearic acid and calcium chloride in sodium borate buffer with the Langmuir-Blodgett technique. Fourier transform infrared (FTIR) spectroscopy indicated carboxylate bands at 1577 and 1543 cm -1 in equal intensity in the powder form, but the films had a higher intensity 1577 cm -1 band than the 1543 cm -1 band. This showed the calcium ions associated with the COO -ions in the monodendate and bidendate structures in powders, and it was mainly in the bidendate structure in films. While characteristic peaks of CaSt 2 at 2θ values of 6.40°and 19.58°were obtained in the X-ray diffraction (XRD) pattern of the dried powdered product, no sharp peaks were present in the 13 layer CaSt 2 film. From scanning electron microscopy (SEM) micrographs, it was seen that calcium stearate powder had lamellar structure and the average particle size was 600 nm. The AFM picture of the CaSt 2 film indicated the surface was not smooth with a peak to valley distance of 6 nm.

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Section: Precipitation Processsupporting

confidence: 87%

“…Filtering, washing, and drying are the important steps in this method. Paulenat et al 2 reported 98.5% conversion of sodium soap upon calcium chloride addition.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Calcium Stearate Powders and Films Prepared by Precipitation and Langmuir−Blodgett Techniques

Gönen

Ozturk

Balköse

et al. 2010

Ind. Eng. Chem. Res.

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“…3,4 Double decomposition reactions of crude oleic soaps and inorganic compounds indicated cation exchange reactions were temperature dependent and that the presence of ethanol in the reaction medium enhanced the rate of reaction. 5 The fusion process, however, produces metal soaps by the reaction of metal oxides, hydroxide, carbonate, or acetate with a molten fatty acid at temperatures sufficiently high to form metal soaps. Instead of washing and drying processes, a grinding step becomes important to obtain a product with desired particle size.…”

Section: Introductionmentioning

confidence: 99%

Zinc Stearate Production by Precipitation and Fusion Processes

Gönen

Balköse

İnal

et al. 2005

Ind. Eng. Chem. Res.

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In this study, the production of ZnSt 2 using sodium stearate and zinc sulfate in a precipitation process, and stearic acid and zinc oxide in a fusion process, was investigated with regard to product purity. In the fusion process, an increase in mixing rate decreased the induction time occurring at the beginning of the reaction. While the melting point of the zinc stearate prepared by the precipitation process was found to be about 122°C by optical microscopy, it was slightly lower than 122°C for zinc stearate produced by the fusion process. Differential scanning calorimetry (DSC) indicated onset of melting at 120°C and 118°C for samples prepared by precipitation and fusion processes, respectively. Characteristic peaks of ZnSt 2 were present in XRD patterns of the products obtained by both processes. From SEM micrographs, it was seen that zinc stearate obtained by both processes had lamellar structure.

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“…Metal carboxylates have played an important role in the development of poly vinyl chloride (PVC) as an important commercial polymer (Owen and Msayib, 1989). Soaps, alkaline and alkaline-earth as well as metallic soaps are employed in various fields (Poulenat et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Relative thermal stability of metal soaps of Ximenia americana and Balanites aegyptiaca seed oils

Folarin¹,

Eromosele²,

Eromosele³

2011

Sci. Res. Essays

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Metal soaps of Ximenia americana seed oil (XSO) and Balanites aegyptiaca seed oil (BSO) were prepared by metathesis in aqueous alcohol solution. The thermal stability of the metal carboxylates (soaps) was studied thermogravimetrically in the temperature range 50 -500°C under nitrogen. The thermal stability of the carboxylates was assessed in terms of temperatures at which various extents of decomposition were attained and weight loss at the initial stage of decomposition. The weight loss for all the metal soaps was less than 10% at temperature up to 250°C. The activation energies at the initial stage of decomposition of the metal carboxylates modelled using Broido's equation are in the range 6.93 -14.14 kJmol -1 for XSO while those of BSO ranged between 15.52 -28.41 kJmol -1. Based on these results, metal soaps of BSO are thermally stable than those of the corresponding XSO soaps. The results suggest potential application of carboxylates of X. americana and B. aegyptiaca seed oils in some industrial applications.

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Double Decomposition Reactions for the Production of Alkaline and Alkaline-Earth Oleic Soaps under Salting-Out Conditions

Cited by 15 publications

References 4 publications

Preparation and Characterization of Calcium Stearate Powders and Films Prepared by Precipitation and Langmuir−Blodgett Techniques

Preparation and Characterization of Calcium Stearate Powders and Films Prepared by Precipitation and Langmuir−Blodgett Techniques

Zinc Stearate Production by Precipitation and Fusion Processes

Relative thermal stability of metal soaps of Ximenia americana and Balanites aegyptiaca seed oils

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