燃料化学学报Issue(4)：422-428,7.
稻杆的热溶剂提质及多级分离
Upgrading and multistage separation of rice stra w by degradative solven t extraction
摘要
Abstract
Upgrading and multi-s tage separation (UMSS)o f rice straw was conducted at different temperatures using 1-methylnaphthalene (1-MN) as solvent.Three main solid products were obtained: low molecular weight extract (soluble), high molecular weight extract (deposit) and extraction residue ( residu e).The elemen tal composition, chemical struc ture andp hysicochemicalc haracteristic of each component were analyzed in detail. Alkali and alkaline earth metal (AAEM) contents of solid products and rice straw were also measured by ICP-MS.The results showed th e yield of soluble increased with tempera ture, and th e carbon-b ased yield of soluble reached 33.48% at 350 ℃.The carbon conten t and oxygen content of th rees olid products (soluble, deposit, and residue) increa sed and decrease d wit h tempe rature, respectively.The carbon content of soluble and deposit reached up to 82.36% and 80.59% respectively.Meanwhile the oxygen contents of them were as low as 9.50%and 12.03% respectively.More than 86.99% oxygen of rice straw was removed as H2 O and CO2 .Soluble was almost free from ash, and the ash content of deposit was also less than 1.50%.The higher heating values (HHV) of three solid products were significantly higher than that of rice straw.The FT-IR results indicated that not only dehydration reaction and decarboxylation reaction occurred, but also including obvious aromatization reaction.The contents of Na, Mg and K of soluble and deposit were extremely low, and they decreased with temperature gradually. In conclusion, the degradative solvent extraction method realized dehydration, deoxygenation and multistage separation of biomass under mild condition, and obtained a variety of products of low ash and oxygen content as well as high carbon content and HHV.关键词
热溶剂/生物质/多级分离/提质/AAEMKey words
degradative solvent extraction/biomass/multistage separation/upgrading/alkali and alkaline earth metals分类
能源科技引用本文复制引用
朱贤青,张宗,周岐雄,蔡颋,乔恩,李显,姚洪..稻杆的热溶剂提质及多级分离[J].燃料化学学报,2015,(4):422-428,7.基金项目
国家自然科学基金（21306059）；新疆维吾尔自治区国际科技合作计划（20136007）；华中科技大学自主创新研究基金（2013TS077）。 （）
