Speciation and quantification of vapor phases in soy biodiesel and waste cooking oil biodiesel [An article from: Chemosphere] - Biodiesel Books - Home Power - Alternative Energy - Solar Panels

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December 4, 2008

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Speciation and quantification of vapor phases in soy biodiesel and waste cooking oil biodiesel [An article from: Chemosphere]
enlarge	Authors: C.y. Peng, C.h. Lan, Y.t. Dai Publisher: Elsevier Category: Book Buy New: $10.95 Format: Html Language: English (Published) Media: Digital ASIN: B000PC05MQ Publication Date: December 1, 2006 Availability: Available for download now

Editorial Reviews: Product Description This digital document is a journal article from Chemosphere, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser. Description: This study characterizes the compositions of two biodiesel vapors, soy biodiesel and waste cooking oil biodiesel, to provide a comprehensive understanding of biodiesels. Vapor phases were sampled by purging oil vapors through thermal desorption tubes which were then analyzed by the thermal desorption/GC/MS system. The results show that the compounds of biodiesel vapors can be divided into four groups. They include methyl esters (the main biodiesel components), oxygenated chemicals, alkanes and alkenes, and aromatics. The first two chemical groups are only found in biodiesel vapors, not in the diesel vapor emissions. The percentages of mean concentrations for methyl esters, oxygenated chemicals, alkanes and alkenes, and aromatics are 66.1%, 22.8%, 4.8% and 6.4%, respectively for soy biodiesel, and 35.8%, 35.9%, 27.9% and 0.3%, respectively for waste cooking oil biodiesel at a temperature of 25+/-2^oC. These results show that biodiesels have fewer chemicals and lower concentrations in vapor phase than petroleum diesel, and the total emission rates are between one-sixteenth and one-sixth of that of diesel emission, corresponding to fuel evaporative emissions of loading losses of between 106@mgl^-^1 and 283@mgl^-^1. Although diesels generate more vapor phase emissions, biodiesels still generate considerable amount of vapor emissions, particularly the emissions from methyl esters and oxygenated chemicals. These two chemical groups are more reactive than alkanes and aromatics. Therefore, speciation and quantification of biodiesel vapor phases are important.

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