Two-Step Treatment of Corn Cob in H2O–SO2 System
2014
Yan, Jiahe | Hou, Yucui | Ren, Shuhang | Niu, Muge | Wu, Weize
Because of its controllable and recoverable properties, the H₂O–SO₂ system was studied as a reaction medium to hydrolyze corn cob to produce chemicals by a two-step treatment. The results indicated that, after the first-step treatment of corn cob, 27.0% xylose, 3.3% glucose, and 3.2% arabinose could be obtained at 140 °C for 1.5 h with 0.024 g/cm³ SO₂; after the second-step treatment, 8.6% glucose could be obtained at 190 °C for 0.5 h with 0.048 g/cm³ SO₂. The total yield of products by the two-step treatment of corn cob was 48.4%, which was greater than that obtained by the one-step treatment, 32.4% at 190 °C for 0.5 h with 0.048 g/cm³ SO₂. Furthermore, the degradation products obtained from the two-step treatment were less than those obtained from the one-step treatment. More importantly, after the reaction, SO₂ could be swept by stream stripping and reused.
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