Dry washing in biodiesel purification: a comparative study of adsorbents

Abstract

O objetivo deste trabalho é comparar a eficiência de diferentes adsorventes na purificação de biodiesel produzido por transesterificação alcalina do óleo de soja (metanol/KOH). As metodologias propostas foram baseadas na utilização de Magnesol ® , sílica, Amberlite BD10 DRY ® e Purolite PD 206 ® como adsorventes e foram desenvolvidas por adsorção a 65 ºC. A eficiência de cada adsorvente foi medida através do teor residual de potássio, álcool, água e sabão, dissolvidos no biodiesel purificado. Como resultado, observamos que Magnesol ® e sílica apresentaram melhores propriedades de adsorção que Amberlite BD10 DRY® e Purolite PD 206 ® , especialmente para remover sabão, glicerina livre e ligada e potássio. Em comparação com a lavagem ácida convencional, estas matrizes foram consideradas adequadas para a remoção de espécies contaminantes inorgânicas e orgânicas do biodiesel. Os principais resultados encontrados para estes dois adsorventes (Magnesol ® 1% e sílica 2%) foram valores abaixo de 0,17 mg KOH g -1 de acidez, 1 mg kg -1 de potássio, 61 ppm de sabão, 500 mg kg -1 de água, 0,22% de metanol, 0,30% de glicerina livre e 0,03% de glicerina ligada.The purpose of this work is to compare the efficiency of different adsorbents in the purification of biodiesel produced by alkaline transesterification of soybean oil (Methanol/KOH). The proposed methodologies were based on the use of Magnesol ® , silica, Amberlite BD10 DRY ® and Purolite PD 206 ® as adsorbents and were developed by adsorption at 65 ºC. The response of each adsorbent was measured through the residual potassium, alcohol, water and soaps dissolved in the purified biodiesel. As a result, we observe that Magnesol ® and silica showed better adsorption properties than Amberlite BD10 DRY ® and Purolite PD 206 ® , especially for removing soap, free and bonded glycerol and potassium. In comparison to the conventional acid water washing, these matrices were found to be equally appropriate for the removal of inorganic and organic contaminant species from biodiesel. The main results found for these two adsorbents (Magnesol ® 1% and silica 2%) were values below 0.17 mg KOH g -1 for acid number, 1 mg kg -1 of K, 61 ppm of soap, 500 mg kg -1 of water, 0.22% of methanol and 0.03% of free glycerol. IntroductionBiodiesel is a diesel fuel substitute obtained mainly by basic catalytic transesterification of oils and fats, and it is composed by fatty acid mono-alkyl esters that are produced from the reaction of low-acid-number vegetable oils with an alcohol in the presence of a basic catalyst. [1][2][3] Biodiesel is currently produced by the base-catalyzed transmethylation of triglycerides, producing fatty acids methyl esters (FAME). 4,5 At the end of the reaction, the Faccini et al. 559 Vol. 22, No. 3, 2011 glycerol rich-phase is separated from the methyl ester layer by decantation.Methyl esters usually contain contaminant materials that are detrimental to the quality of the fuel, and must be eliminated from the product. Removal of glycerol and glycerides from biodies...

Biodiesel production from butter factory effluent

“…The water content increases with an increase in load. This is not consistent with literature (Faccini et al, 2011). The acid value of the biodiesel decreases with an increase in load.…”

“…The efficiency of the Magnesol ® D-SOL TM lowers as more is added to the system. This is consistent with literature (Faccini et al, 2011). The acid value of the biodiesel is also lowered by the Magnesol ® D-SOL TM .…”

“…The two resins used in this study were Magnesol ® D-SOL TM and Purolite ® PD-206. These resins have been proven to reduce the water content, acid number, soap content, methanol content and potassium content of biodiesel (Manique et al, 2012;Faccini et al, 2011). The untreated and unwashed biodiesel was heated to 65°C before the resins were added.…”

Utilization of kitchen food waste for biodiesel production

“…Removal of glycerol and glycerides is a key step because quality of biodiesel is dependent on glycerol content. High concentration of glycerol in biodiesel can cause problem during storage and increase in aldehyde emissions [8]. Washing of biodiesel include wet washing and dry washing.…”

Determinação Das Isotermas E Adsorção De Glicerol Em Carvão Ativado De Ossos Modificado Com Ácido Nítrico Na Purificação De Biodiesel

“…Devido a grande quantidade de efluentes produzidos nesse processo, novas metodologias de purificação têm sido propostas, dentre as quais se destaca a lavagem a seco, ou por adsorção (LOBO et al 2009;FACCINI et al 2011). …”