Quartz halogen‐ultrasonication integrated rotating reactor for efficient photocatalytic‐thermocatalytic synthesis of glyceryl monocaprin: Kinetics of heterogeneous esterification

摘要

titleAbstract/titlepA pioneering intensification protocol for glyceryl monocaprin (GMC)?synthesis deploying coactive electromagnetic energies,viz. quartz halogen radiation (QHR) and ultrasonication (US) is explored. Concurrently, Amberlyst 15 (A15) and nano‐TiOsub2/sub P25 (NT‐P25) were applied to achieve capric acid (CA) conversion of 97% ± 0.5%, employing the integrated QHR‐US energized rotating reactor (QHRUERR), which was 7.5% ± 0.5% higher than QH energized rotating reactor (QHERR) and 20% ± 1% greater compared to an ultrasonically energized rotating reactor (USERR). Optimal factors, viz., 0.35:1 CA:glycerol mole ratio, 343K temperature, 0.67:1 A15:P25(wt./wt.) dose, resulted maximum GMC selectivity (95% ± 0.3%). Langmuir–Hinshelwood model (iR/isup2/sup = .99) could best represent the esterification kinetics in QHRUERR under optimal condition. Significantly, reaction activation energy was found minimum in QHRUERR (9.63 kJ/mol) compared with a rotating reactor equipped either with QHR (27.5 kJ/mol) or the US (32.74 kJ/mol), thus implying promising synergy and energy efficiency of QHRUERR. Ultraviolet‐visible diffuse reflectance spectra and photoluminescence analyses exhibited the photoactivity of ATO (A15 : NT‐P25=0.67: 1 w/w) catalyst possessing lower band gap energy (2.98 eV). The optimal product GMC demonstrated appreciable food preservative attributes toward iAspergillus Niger/i food pathogen. An energy‐efficient and sustainable reactor could, thus, be explored in this study for proficient green synthesis of valuable food preservatives./p