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Highway Binder Materials From Cellulosic and Related Wastes
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1980-12-01
[PDF-6.03 MB]
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Edition:Final Report
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Abstract:The abundance of cellulosic-based wastes was reviewed by section of the country and type which includes: wood wastes, municipal wastes and manures. Of the most promising waste conversion processes now under consideration, pyrolysis, liquefaction, and hydrolysis were selected for preliminary laboratory screening. Model wastes for this study included several pyrolysis oils, paper, sawdust and dried cow manure. Distillate oils produced during wood waste pyrolysis (WPO) served best as precursors of products that approximated bitumens and highly viscous fluids. In the statistically designed study of process parameters which followed, the best conditions were identified for distilling and hydrogenating the crude WPO for conversion to a usable product (hydrogenate). This hydrogenate, because of its high oxygen content, could be added to conventional asphalt only in amounts up to ca. 15 weight percent concentration with little or no observed property change. In combination with sulfur, the ternary system-AC/hydrogenate/S:29/29/42 had a penetration value comparable to that of AC/S:65/35. A 909 metric ton/day waste processing facility could be cost effective in producing 72.7 metric tons per day of pyrolysis product equivalent to 318 metric tons or more of blended binder. This assumes that waste is available at no cost and that coproduct oil and char are credited at equivalent heating values.
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