leachate recycling during the lignocellulosic conversion process

摘要

leachate recycling during the lignocellulosic conversion process. The present invention provides a process for producing fermentable sugar or a fermentation product from a lignocellulosic feedstock. The process comprises leaching the lignocellulosic feedstock with an aqueous solution to remove at least potassium salts from the lignocellulosic feedstock without significantly hydrolyzing hemicellulose and cellulose, thereby producing a leached and leached feedstock. leachate is removed from the leachate and concentrated. The leached raw material is hydrolyzed to produce fermentable sugar, which can be fermented to produce a fermentation broth comprising the fermentation product. The concentrated leachate is recirculated to one or more process steps involving the addition of alkali to adjust the pH of a process stream.