Monitoring Enzymatic Hydroesterification of Low-Cost Feedstocks by Fourier Transform InfraRed Spectroscopy

Autor:	Manuel Almeida, M. da C. Alvim-Ferraz, Joana M. Dias, Mariana Cruz
Přispěvatelé:	Faculdade de Engenharia
Jazyk:	angličtina
Rok vydání:	2019
Předmět:	Carboxylic acid 0211 other engineering and technologies 02 engineering and technology enzymatic hydroesterification lcsh:Chemical technology complex mixtures 01 natural sciences Catalysis lcsh:Chemistry chemistry.chemical_compound Hydrolysis lipase lcsh:TP1-1185 021108 energy Physical and Theoretical Chemistry Lipase Fourier transform infrared spectroscopy Fatty acid methyl ester chemistry.chemical_classification Biodiesel Chromatography biology 010401 analytical chemistry 0104 chemical sciences acid oil chemistry FTIR lcsh:QD1-999 Biodiesel production biology.protein Methanol soapstock olive pomace oil
Zdroj:	Catalysts, Vol 9, Iss 6, p 535 (2019) Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP Catalysts Volume 9 Issue 6
ISSN:	2073-4344
Popis:	Enzymatic hydroesterification is a heterogeneous catalyzed process suitable for the conversion of low-cost feedstocks in biodiesel production, namely, because of its tolerance to high free fatty acid contents. The current study describes the use of Fourier transform infrared spectroscopy (FTIR) to monitor biodiesel production using enzymatic hydroesterification and, as raw materials, acid oil from soapstock and olive pomace oil. Acid oil (~34 wt.% FFA) and olive pomace oil (~50 wt.% FFA) were first hydrolyzed (35 ° C, 24 h, 200 rpm, 3 wt.% of lipase from Thermomyces lanuginosus, and 1:0.5 water:oil ratio, w:w), and then enzymatic esterification was performed (35 ° C, 7 h, 200 rpm, 2 wt.% of lipase from Thermomyces lanuginosus, and 2:1 molar ratio of methanol to acid). FTIR analyses were conducted on the products using a Jasco FT/IR-4100 with a scanning range of 4000&ndash 650 cm&minus 1 at 4 cm&minus 1 spectral resolution and 54 scans. For free fatty acid (FFA) quantification, the C=O band at 1708 cm&ndash 1 was used, corresponding to the carboxylic acid, whereas for fatty acid methyl ester (FAME) quantification, the peak corresponding to C=O at 1746 cm&minus 1 was considered, which corresponded to the ester. The results were calibrated using volumetric titration and gas chromatography analyses, concerning FFA and FAME quantification, respectively. The best conditions for analysis were determined, and a calibration method was established. FTIR has shown to be a simple, fast, and clean technique suitable to monitor hydroesterification of low-cost feedstocks.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bcfd6b292f19a378024fb4ad28b42611 https://www.mdpi.com/2073-4344/9/6/535 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.