INVESTIGADORES
QUERINI Carlos Alberto
artículos
Título:
Crude glycerine purification by solvent extraction
Autor/es:
M. MAQUIRRIARIN; C. NEYERTZ; C. QUERINI; M.L. PISARELLO
Revista:
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
Editorial:
BRAZILIAN SOC CHEMICAL ENG
Referencias:
Lugar: BRASIL; Año: 2021
ISSN:
0104-6632
Resumen:
In this work, a process to remove saponifiable matter (fatty acid methyl esters (FAME), free fatty acids, mono-, di-, andtri-acylglycerides) from industrial crude glycerine samples is addressed. The extraction of these impurities with differentsolvents is analyzed in detail, using diethyl ether, methyl ter-butyl ether, FAME, toluene, hexanes, 1-butanol and 1-hexanol.Hexane and biodiesel were chosen as the main candidates in order to be used in this process. It was found that it is necessaryto add water to the crude glycerine to efficiently remove the saponifiable matter. Water increases the polarity of thephase and favors the transference of the impurities to the non-polar phase, e.g. the hexanes. The use of FAME as extractionsolvent requires the use of higher temperature than when using hexanes, higher levels of water addition, and pH adjustmentbefore the extraction. The addition of 20 wt% of water, carrying out the extraction at 80 °C with a pH adjustment at 3, andseparation by centrifugation represents a good set of process conditions in order to efficiently extract the saponifiable matterfrom crude glycerine. UV?Vis analysis proved to be very useful in following the purification process, while FTIR carriedout directly on the glycerine has not enough sensitivity to follow the extraction.
