Open AccessSupercritical Water Oxidation of 3-Methylpyridine with Propylene Glycol
Author(s) -
Falah Kareem Hadi Al-Kaabi,
Bushra AlDuri,
Iain Kings
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23208
Subject(s) - chemistry , polyvinyl alcohol , supercritical fluid , isopropyl alcohol , propylene oxide , hydrogen peroxide , propylene carbonate , nuclear chemistry , alcohol , inorganic chemistry , organic chemistry , polymer , ethylene oxide , electrode , copolymer , electrochemistry
The destruction of 3-methylpyridine by supercritical water oxidation (SCWO) using propylene glycol(PG) and isopropyl alcohol (IPA) as co-fuels in a plug flow reactor was carried out. Hydrogen peroxidewas the oxygen source. All the experiments were carried out at 25 MPa and a range of temperaturesfrom 425-525 ºC. The residence times range from 6 s to 14 s. Results were presented in terms of totalorganic carbon (TOC) as a function of time with various process parameters. The findings support thepositive effect that propylene glycol has on the destruction of 3-methylpyridine, where TOC removalis ≥ 97.5% at 525 ºC and 14 s. The maximum TOC removal efficiency is 93% at 425 ºC, 14 s, and the[propylene glycol]/[3-methylpyridine]o ratio of 3. The removal efficiency of nitrogen in the presenceof propylene glycol reaches 89% at 525 ºC and 10 s. The oxidant ratio also has a positive effect on theremoval of TOC in the three systems. Addition of propylene glycol causes a significant developmentin the ratio at 425 ºC, more so than when isopropyl alcohol was added. This is due to two hydroxylgroups in propylene glycol oxidation that enhance the reaction by generating various free radicals.