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A comparison of attenuated total reflectance‐FTIR spectroscopy and GPC for monitoring biodiesel production
Author(s) -
Dubé Marc A.,
Zheng Sheng,
McLean David D.,
Kates Morris
Publication year - 2004
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-006-0948-x
Subject(s) - transesterification , attenuated total reflection , biodiesel , fourier transform infrared spectroscopy , reproducibility , biodiesel production , gel permeation chromatography , chemistry , chromatography , glycerol , methanol , permeation , infrared spectroscopy , organic chemistry , membrane , chemical engineering , catalysis , biochemistry , polymer , engineering
Gel permeation chromatography (GPC) and attenuated total reflectance (ATR)‐FTIR spectroscopy were used to monitor the products of transesterification of waste frying oil in methanol to FAME or biodiesel. To evaluate the reliability and reproducibility of each method, quantitative analyses of mixtures of standards (TG, DG, MG, FAME, and glycerol) as well as lipid products of transesterification were carried out. The reproducibility of each method was found to be within ±1–5%. The differences between the results of the two methods were less than ±2%. The GPC method showed good separation of the intermediate products MG and glycerol from the TG starting material and FAME, but DG were not completely separated from TG, GPC gave good quantitative results for MG and FAME, but the TG and DG analyses required correction, depending on the mole ratio of TG/DG. In contrast, ATR‐FTIR spectroscopy could only give quantitative data for the sum of TG+DG+MG.