Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 205, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2023.117453
Keywords
Hemicellulose; Separation; Levulinic acid pretreatment; gamma-valerolactone; Lignin
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The effect of a bio-based solvent coupled pretreatment system on the separation of poplar biomass components was investigated, showing that the method can effectively separate cellulose and inhibit the repolymerization of lignin.
It is of great significance to inhibit the repolymerization of lignin when removing hemicellulose by acid pretreatment. Adding a lignin fragment scavenger is an effective method to inhibit its repolymerization. Here, the effect of a bio-based polar aprotic solvent, levulinic acid (Lev), and gamma-valerolactone (GVL) coupled pretreatment system on the separation yield of poplar biomass components was investigated. The optimum pretreatment conditions were a Lev concentration was 7.0%, reaction temperature was 170 C, pretreatment time was 60 min, and GVL concentration was 9.0%. The separation yield of hemicellulose was 84.54%, which was a 4.53% increase over that with Lev pretreatment. The retention yield of cellulose was 89.68%. In addition, the separation efficiency was significantly improved when the pretreatment time was reduced by 40 min. The reaggregation of lignin was suppressed under the condition of maximum hemicellulose separation. In the lignin samples the content of beta-O-4 was as high as 47.81%. Simultaneously, the content of phenolic and aliphatic hydroxyl increased. The results revealed that Lev/GVL pretreatment had good hemicellulose separation selectivity and excellent lignin fragment removal efficiency. This provides a new strategy for suppressing adverse effects on the lignin structure in the efficient separation of hemicellulose in pretreatment.
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