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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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稻杆的热溶剂提质及多级分离
, PP. 422-428
Keywords: 热溶剂,生物质,多级分离,提质,aaem
Abstract:
？采用1-甲基萘(1-mn)为溶剂,在不同温度下(250、300、350℃)对稻秆进行热溶剂提质及多级分离,获得3种主要固体产物:低分子量萃取物(soluble)、高分子量萃取物(deposit)和萃取残渣(residue),以及少量气体产物和液体产物。对各组分的元素组成、化学结构、物理化学特性等进行了详细分析,并采用icp-ms测定了其碱金属和碱土金属(aaem)含量。结果发现,低分子量萃取物收率随着温度的升高而增大,350℃时碳基收率达到33.48%。3种固体产物的碳含量和氧含量随着温度的升高而分别升高和降低,350℃时soluble、deposit的碳含量分别高达82.36%、80.59%,氧含量分别低至9.50%、12.03%,稻杆原样中高达86.99%的氧以h2o或co2的形式释放。soluble几乎无灰,deposit的灰含量也低于1.50%。3种固体产物的高位发热量显著高于稻杆原样。ft-ir结果表明,稻杆热溶剂处理过程中除发生了脱水反应、脱羧基反应外,还有明显的芳香化反应。soluble和deposit的na、mg和k含量极低,而且随温度的升高其含量逐渐降低。总之,热溶剂提质及多级分离法实现了温和条件下的生物质脱水脱氧提质,并获得低灰低氧含量、高碳含量和发热量的多种产物,此方法有较好的应用前景。
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