Effects of temperature and solvent concentration on the solvent crystallization of palm-based dihydroxystearic acid with isopropyl alcohol

Koay, Gregory F.L.; Chuah, Teong-Guan; Zainal-Abidin, Sumaiya; Ahmad, Salmiah; Choong, Thomas Shean Yaw

doi:10.1016/j.partic.2011.04.011

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…Thus, by using higher concentration of hydrogen peroxide, a higher relative conversion to oxirane can be achieved. This statement is supported by a few studies that uses high concentration of hydrogen peroxide in the epoxidation process 17,18 where both used 60% hydrogen peroxide in their studies and the result shows that they can achieve a higher percentage of RCO% by using concentrated hydrogen peroxide.…”

Section: Resultsmentioning

confidence: 80%

Catalytic epoxidation of palm oleic acid by heterogeneous catalysts: Optimization and kinetic model

Azmi,

Azlee,

Jalil

2023

Env Prog and Sustain Energy

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Epoxidized vegetable oils can produce a natural‐based polymer product as chemical reaction intermediates, plasticisers, and stabilizers in polyvinyl chloride. This study aims to identify the effects of using different concentrations of hydrogen peroxide and the effect of different molar ratios of hydrogen peroxide on relative conversion to oxirane. Epoxidized palm oil was produced in situ using performic acid as epoxidation agents and titanium dioxide as a catalyst. The results indicated that a higher concentration of hydrogen peroxide at 50% concentration and the ratio of 2:1 of hydrogen peroxide to palm oil used in the in situ epoxidation of had provided a higher relative conversion to oxirane (50%) in reaction time (70 min). Fourier transformation infrared spectroscopy revealed the presence of an oxirane group at 1200 cm−1. Numerical kinetic modeling was developed with applied genetic algorithm optimization to find the process model that fit experimental data. Then, the kinetic rate, k parameters obtained k11 = 0.031 mol L−1 min−1, k12 = 3.159 mol L−1 min−1, k2 = 2.620 mol L−1 min−1 for epoxidation palm oil, and k3 = 1.19 × 10−5 mol L−1 min−1 in degradation process.

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Section: Resultsmentioning

confidence: 80%

Catalytic epoxidation of palm oleic acid by heterogeneous catalysts: Optimization and kinetic model

Azmi,

Azlee,

Jalil

2023

Env Prog and Sustain Energy

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“…It is therefore necessary to develop a new solvent system and to further optimize the process. The solvent type, liquid‐solid ratio and operational temperature all significantly affect crystal forms and purity during processing . Solubility data and phase diagram determination are necessary and helpful for solvent screening and operational condition optimizing in the solvent crystallization process .…”

Section: Introductionmentioning

confidence: 99%

Optimization of solvent crystallization process in obtaining high purity anthracene and carbazole from crude anthracene

Zheng

et al. 2013

AIChE Journal

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Solvent crystallization is the main method used for preparing anthracene and carbazole from the crude anthracene. The key to the optimization of this method is improving the solubility selectivity of the solvent by means of solvent modulating and process optimization. In this study, the solubility of anthracene, phenanthrene, and carbazole in xylene, dimethylformamide (DMF), DMF with amine/amide, isopropanolamine, and chlorobenzene is examined and the solid‐liquid ternary anthracene–carbazole–DMF/(DMF+19.96% isopropanolamine) system phase diagram is determined and applied in the solvent crystallization process. The results showed that the solubility selectivity of xylene increases with increased temperature. Also, selectivity increases with an increase of the amount of isopropanolamine in the mixture of DMF and isopropanolamine, while decreases with increased temperature. Through multiple washings of crude anthracene with xylene, DMF+19.96% isopropanolamine, and chlorobenzene, it was possible to obtain anthracene and carbazole of purity higher than 98 wt %. © 2013 American Institute of Chemical Engineers AIChE J, 60: 275–281, 2014

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Effects of temperature and solvent concentration on the solvent crystallization of palm-based dihydroxystearic acid with isopropyl alcohol

Cited by 2 publications

References 23 publications

Catalytic epoxidation of palm oleic acid by heterogeneous catalysts: Optimization and kinetic model

Catalytic epoxidation of palm oleic acid by heterogeneous catalysts: Optimization and kinetic model

Optimization of solvent crystallization process in obtaining high purity anthracene and carbazole from crude anthracene

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