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首页> 外文期刊>RSC Advances >Hydrothermal carbonization of bamboo in an oxalic acid solution: effects of acid concentration and retention time on the characteristics of products
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Hydrothermal carbonization of bamboo in an oxalic acid solution: effects of acid concentration and retention time on the characteristics of products

机译：草酸溶液中竹子的水热碳化：酸浓度和保留时间对产品特性的影响

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摘要

Bamboo was hydrothermally carbonized in a batch reactor using an oxalic acid solution at 190 degrees C for the production of hydrochar and aqueous products. The influences of oxalic acid concentration and retention time were examined, and the products obtained were characterized in terms of energy yield, chemical components and structural properties. It was found that the energy densification values at a high acid concentration of 0.8 mol L-1 were comparable to those of most torrefied lignocelluloses. No hemicelluloses were detected in the hydrochar obtained under the conditions of highest severity (0.8 mol L-1 acid concentration and 20 min), indicating that the lignocellulose hemicelluloses were completely removed. In addition, cellulose also showed some degradation; the highest degradation rate of cellulose was 56.69% at the highest carbonization severity. The lignin content showed an increasing trend in the hydrochar with increasing carbonization severity. The thermal stability of the hydrochar increased with the carbonization severity. The aqueous solution obtained had a high antioxidant capacity with a inhibition rate of 63.5% for 2,2-diphenyl-1-picrylhydrazyl, higher than that of a commercial antioxidant, butylated hydroxytoluene (46.4%). The present study indicated that the hydrothermal carbonization of bamboo produced a solid hydrochar with high potential for fuel applications and degraded chemicals with high potential as antioxidants.
机译：使用草酸溶液在190℃下在间歇式反应器中对竹进行水热碳化，以生产碳氢化合物和水性产品。考察了草酸浓度和保留时间的影响，并从能量收率，化学成分和结构性质等方面对所得产物进行了表征。发现在0.8 mol L-1的高酸浓度下，能量致密化值与大多数焙干的木质纤维素相当。在最高强度（0.8 mol L-1酸浓度和20分钟）的条件下获得的水煤中未检测到半纤维素，表明木质纤维素半纤维素已被完全去除。另外，纤维素也表现出一定程度的降解。在最高碳化强度下，纤维素的最高降解率为56.69％。木质素含量随着炭化程度的增加而显示出水炭中的增加趋势。水煤的热稳定性随碳化程度的增加而增加。所获得的水溶液具有高抗氧化能力，对2，2-二苯基-1-吡啶并肼基的抑制率为63.5％，高于市售抗氧化剂丁基化羟基甲苯的抑制率（46.4％）。本研究表明，竹子的水热碳化产生了具有高燃料应用潜力的固体碳氢化合物和具有高潜力的抗氧化剂降解化学品。

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