What is claimed is:
1. A process for producing a lignin-based enzymatic hydrolysis enhancer, said process comprising:
(a) providing a lignocellulosic biomass feedstock;(b) fractionating said feedstock in the presence of a sulfur-containing acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin;(c) recovering at least some of...
This patent application is a continuation of U.S. patent application Ser. No. 14/951,033, filed Nov. 24, 2015, which claims priority to U.S. Provisional Patent App. No. 62/085,464, filed Nov. 28, 2014, each of which is hereby incorporated by reference herein.