Biomass pretreatment process

摘要

The process for the treatment of ligno-cellulosic biomass comprises the steps of:
A) Soaking a ligno-cellulosic biomass feedstock in vapor or liquid water or mixture thereof in the temperature range of 100 to 210° C. for 1 minute to 24 hours to create a soaked biomass containing a dry content and a first liquid;B) Separating at least a portion of the first liquid from the soaked biomass to create a first liquid stream and a first solid stream; wherein the first solid stream comprises the soaked biomass; andC) Steam exploding the first solid stream to create a steam exploded stream comprising solids and a second liquid.

主权项

1. A process for the treatment of ligno-cellulosic biomass comprising the steps of:
A) soaking a ligno-cellulosic biomass feedstock in a low temperature soaking step in a liquid comprised of water at a temperature in the range of 25 to 100° C. for 1 minute to 24 hours and the low temperature soaking step is followed by a separation step to separate at least a portion of the liquid from the low temperature soaked ligno-cellulosic biomass; B) soaking a lingo-cellulosic biomass feedstock in vapor or liquid water or mixture thereof in the temperature range of 145 to 165° C. for a time within the range selected from the group consisting of 1 minute to 24 hours, 1 minute to 6 hours, 1 minute to 4 hours, 1 minute to 3 hours, 1 minute to 2.5 hours, and 1 minute to 2.0 hours to create a soaked biomass containing a dry content and a first liquid; C) separating at least a portion of the first liquid from the soaked biomass to create a first liquid stream and a first solid stream; wherein the first solid stream comprises the soaked biomass; D) steam exploding the first solid stream to create a steam exploded stream comprising solids and a second liquid; E) washing the steam exploded stream with at least a third liquid to create a third liquid stream; F) purifying the third liquid stream to create a second purified liquid stream by removing at least a portion of at least one inhibitor selected from the group consisting of acetic acid, formic acid, levulinic acid, furfural, 5-HMF and phenolic compounds; and G) combining the second purified liquid stream with at least a portion of the steam exploded stream.