Abstract
Past development efforts and commercial experience with acid hydrolysis of wood are reviewed and more recent or ongoing work on wood hydrolysis is cited. One recent R & D project conducted at New York University has been selected as representative of the newer dilute acid hydrolysis processes. A conceptual design has been prepared in sufficient detail to allow estimation of the capital investment and the plant gate price of ethanol. The results of the analysis of the NYU process are compared on a common basis with the results of previous economic analysis work by the authors. Based on the current state of development and the economic analyses, it does not appear that wood hydrolysis processes will soon be in a position to seriously challenge corn conversion in the United States for fuel ethanol production. For hydrolysis of wood, there is no clear economic preference between acid and enzymatic hydrolysis processes, and additional R & D is needed in both areas. Choice of a wood hydrolysis process requires consideration of numerous factors such as sugar yield and the nature, yield, and value of by-products.
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