The conversion of crop wastes into fermentable sugars and other chemicals mediated by deep eutectic solvents (DESs) has attracted significant attention. In this work, lactic acid, the constituents of DES, was proved to be a harmful inhibitor for cellulase during the conversion of rice straw to fermentable sugars. Nevertheless, the study here also demonstrated that depending on conditions, lactic acidic–choline chloride (LC) can be utilized for pretreatment and saccharification in a one-pot (PSOP) process with high sugar release. The PSOP process performed at 120℃ for 3 h, 15% biomass loading, a 0.30 mol/L LC with a 40 FPU enzymes saccharification system, achieved a total sugar yield of 75.7%. This value is significantly higher than the 49.9% yield achieved in traditional solid-liquid separation (SLS) processes due to the excellent xylose yield (75.7%). This high total sugar yield is attributed to the retention of the xylooligosaccharide, which was directly utilized in the PSOP process. In addition, the techno-economic analysis demonstrates the potential feasibility of a LC based PSOP process in industrial application.
Huanfei Xu,Guang Yu,Xindong Mu,Chunyan Zhang,Paul DeRoussel,Chao Liu,Bin Li,Haisong Wang
A modified alkali pretreatment (MAP) process was established in both lab-scale and pilot-scale, based on the on-line production and utilization of lignosulfonate for improving enzymatic saccharification of corn stover. Sodium lignosulfonate (SLS) produced by directly sulfonating lignin in spent liquor separated from alkali pretreatment was reused in the next cycle of alkali pretreatment. The results showed that, by using 11 wt% NaOH, 2 wt% SLS and 0.1 wt% anthraquinone (AQ) in MAP, delignification rate and final total sugar yields could reach about 78% and 80% respectively, which were about 6% and 9% higher compared to the blank conventional NaOH pretreatment under the same conditions. In addition, sulfonation degree of SLS had linearly impact on the final total sugar yields.
危险品化学品经营许可证（带存储）