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Efficient monooleoyl glycerol synthesis employing hybrid ultrasonic‐infrared‐wave promoted reactor: Concurrent catalytic and noncatalytic esterification kinetics
Author(s) -
Srivastava Megha,
Mukhopadhyay Punam,
Chakraborty Rajat
Publication year - 2020
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.21330
Subject(s) - chemistry , catalysis , batch reactor , yield (engineering) , kinetics , glycerol , thermogravimetric analysis , nuclear chemistry , differential scanning calorimetry , thermal stability , activation energy , chemical engineering , organic chemistry , physics , quantum mechanics , engineering , thermodynamics , materials science , metallurgy
For the first time, intensification of monooleoyl glycerol (MOG) synthesis has been investigated in an ultrasonic‐infrared‐wave (USIRW) promoted batch reactor. Esterification of octadecanoic acid (ODA) with glycerol (Gl) has been conducted [using Amberlyst 36 wet catalyst] in three different reactors, namely traditional batch reactor (TBR), infrared wave promoted batch reactor (IRWPBR), and USIRW‐promoted batch reactor (USIRWPBR) to assess the relative efficacy. The energy‐efficient USIRWPBR remarkably intensifies the ODA‐Gl esterification as manifested through superior ODA conversion (92.5 ± 1.25%) compared to that achieved in IRWPBR (79.8 ± 1.2%) and TBR (36.39 ± 1.25%). The most favorable reaction condition for optimum ODA conversion and maximum MOG yield was identified through statistical optimization over a selected parametric range, namely 3‐5 Gl/ODA mole ratio, 0.004‐0.006 g/mL Amberlyst 36 catalyst concentration, 300‐700 rpm impeller speed, and 333‐353 K reaction temperature. The present study also reports the formulation and validation of an innovative reaction kinetics, that is, concurrent noncatalytic and heterogeneously catalyzed (CNCHC) reaction mechanism in addition to the conventional heterogeneous kinetic models (LH and Eley‐Rideal mechanisms). Under combined USIRW, the CNCHC esterification mechanism could best describe ODA‐Gl esterification ( R 2 = 0.98) compared to LH ( R 2 = 0.97) and Eley‐Rideal ( R 2 = 0.88) mechanisms. The optimal product (MOG) was characterized by differential scanning calorimetry and thermogravimetric analysis to assess its crystallization property and thermal stability for possible application as plasticizer/fuel additives.