(188b) Effects of Varying Water-to-Glycerin Molar Ratio for Supercritical Water Reformation of Glycerin
AIChE Annual Meeting
2009
2009 Annual Meeting
Engineering Sciences and Fundamentals
Biomass and Biorenewables Processing Under Pressure
Tuesday, November 10, 2009 - 8:48am to 9:06am
The production of biodiesel has increased in recent years in response to rising demands for renewable alternative energy and the use of green-fuel technologies. A common byproduct generated in the industrial manufacture of biodiesel is glycerin. While glycerin has beneficial properties for a variety of end uses, its over-abundance on the market place has rendered a new challenge for finding other economically viable and sizable end-uses for glycerin. This paper addresses a novel use of glycerin as a starting material for hydrogen generation via non-catalytic reformation using supercritical water. Additionally, effects on the water-gas shift reaction are considered. An experimental feasibility study of the novel conversion process was conducted on a 0.4 L tubular reactor constructed of Haynes® Alloy 230. The examined variables for the novel reaction process involved a water-to-glycerin molar ratio ranging from 3:1 to 24:1, a reactor temperature between 868 to 973 K, and space time ranging from 98 to 157 seconds. The effects of the reaction variables, in particular the water-to-glycerin molar feed ratio, on the gaseous hydrogen production, as well as on the overall process chemistry, were mechanistically and kinetically elucidated.
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