摘要
对我国三个不同产地的褐煤进行了硝酸氧化性能的研究,考察了其氧化产物的收率、化学组成和分子结构。结果表明,三种褐煤的氧化产物具有相似的分子组成:水溶酸以多取代基的苯二羧酸为主,酮溶酸主要为含2—3个芳环的低缩合度芳香二元羧酸;此二种酸中可能含有相当数量的游离脂肪酸。硝酸氧化不仅使脂肪族部分发生氧化降解,而且使部分芳核裂解。三种褐煤的氧化活性大致为:寻甸煤>繁峙煤>扎赍诺尔煤。
The behaviour of Xundian, Fanshi and Zalainuoer lignites to nitric acid oxidation was studied by the structure analysis of oxidation products. The products were separated into two portions: water-soluble acid and acetone-soluble acid.The chemical composition and structure parameters of each portion were determined by ultimate and functional group analysis, average molecular weight, IR , ~1H-NMR and ^(13)C-NMR methods. The results show that similar molecular structure was found in the oxidation product of these lignites. That is: water-soluble acid can be represented by benzene-dicarboxylic acids with ethyl and other functional groups. Acetone-soluble acid is mixture of aromaticdicarboxylic acids with 2-3 condensed aromatic rings substituted by C_3-C_(10) alkyl and other functional groups. Probably, the two portions contain free aliphatic acids. It was found that the oxidation of lignites led to the degradation of aliphatic as well as aromatic fractions.The order of oxidation activity of three lignites is Xundian>Fanshi>Zalainuoer. It relates to the degree of aromatic condensation of the lignites.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1990年第3期199-206,共8页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金
关键词
褐煤
硝酸氧解
结构
有机酸
lignite
oxidation by HNO_3
structure analysis
organic acids
