Abstract
In this work, hemicellulose was extracted from corn stover by pretreatment with potassium hydroxide (KOH) solution, and the influences of pretreatment conditions on hemicellulose extraction were investigated. The dissolution rate of xylan from the raw material was used to indicate the extraction yield of the hemicellulose. The results showed that under the conditions of temperature 85 °C, alkali concentration 6%, liquor/solid ratio 8:1 and time 120 min, high xylan extraction yield of 43.74% (based on the xylose content of raw material) was achieved. The content of saccharides and uronic acids in the hemicellulose was 80.22%. The hemicellulose was characterized by FT-IR and TG/DTG after being separated from the hydrolysates by precipitation of the neutralized hydrolysate with 3 times volumes of ethanol.
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