蒸汽爆破废纸稀酸水解的研究

Study on Dilute Acid Hydrolysis of Steam Explosion Waste Paper

关键词:  废纸  稀酸水解  爆破  纤维素

Key Words:Waste paper  hydrolysis  explosion  cellulose

摘要:研究了蒸汽爆破（处理）对废纸（旧杂志纸）稀酸水解糖化的影响，首先探讨了未蒸汽爆破的废纸在液固比为100∶1的条件下，不同温度、H₂SO₄质量分数、水解时间对废纸水解糖化的影响。结果表明，废纸的最佳水解条件为水解温度190℃，H₂SO₄质量分数4%，水解时间50 min，在该条件下水解得到还原糖浓度为2.88 mg/mL，还原糖得率为52.3%。在此条件下对蒸汽爆破后的废纸进行水解，研究得到最佳蒸汽爆破条件为爆破压力2.2 MPa，压力作用时间10 min，废纸含水量8%。蒸汽爆破后的废纸水解还原糖浓度为4.21 mg/mL，还原糖得率为64.7%，较未蒸汽爆破的废纸提高了12.4%，由此表明蒸汽爆破对促进废纸的水解糖化有明显作用。

Abstract:In this paper, the effect of steam explosion on the preparation of reducing sugar by dilute acid hydrolysis of waste paper was studied. Firstly, the effects of temperature, H₂SO₄ concentration and hydrolysis time on the hydrolysis of untreated waste paper under the conditions of liquid/solid ratio of 100∶1 was investigated. The results showed that the optimized sulphuric acid hydrolysis conditions were as follows: concentration of sulfuric acid 4%wt，reaction temperature 190℃，reaction time 50 min, the yield of reducing sugar 52.3%. The steam exploded waste paper hydrolysis under optimized hydrolysis conditions, study found that the best condition of steam explosions were: pressure 2.2 MPa, Pressure holding time 10 min, water content of waste paper 8%. The reducing sugar yield in hydrolysis of the steam explosion waste paper was 64.7%, compared with untreated waste paper increased by 12.4%, which suggesting that steam explosion has obvious effect to promote the hydrolysis of waste paper. Finally, the FI-RT, SET and XRD analyses of explosion waste paper were conducted to explained the reason of improved efficiency of hydrolysis of waste paper.