褐煤树脂中结合酸的化学组成与结构特征

对云南潦浒、寻甸、吉林舒兰褐煤树脂中结合酸进行了GC－MS分析，对其化学结构特征进行了对比研究。结果显示，树脂结合酸均以正构烷酸为主要成分，其分布为C12－C28，高含量的正构烷酸集中在低碳数一端。在潦浒、寻甸树脂结合酸中，C20含量最高，其次为C16，而在舒兰结合酸中，正构烷酸占绝对优势，且C16为最高含量的化合物；去氢松香酸在每个样品中含量均较低，其它三环二萜酸、如松脂酸、三达松脂酸异构体或立体异构体含量也非常低；具有五环三萜骨架的酸性物质，在潦、舒兰结合酸中比较丰富，其含量超过寻甸结合酸；在低碳数一端，存在着各种支链烷酸及苯甲酸、苯酚及取代物。对比树脂烃、树脂游离酸的结果，潦树脂结合酸与寻甸树脂结合酸无论从组成和分布上都是极其相似的，故其原料煤成煤植物和成煤环境具有相似性，与舒兰煤之生源和环境存在着本质的差异。

Chemical constituents and structural characteristic of the combined acids in brown coal resin from Chinese brown coal waxes

The acids combined to form esters, LHZZS,XDZZS and SLZZS, the fractions in brown coal resins from brown coal waxes from Liaohu, Xundian (Yunnan Province) and Shulan(Jilin Province) brown coal respectively, were derived by CH 2N 2 to methyl esters and their chemical constituents and structural characteristic were studied on GC MS. The experimental results demonstrate that normal fatty acids from C 12 to C 28 are dominant in combined acid fraction, but concentrated mainly in low carbon number (C 16 ,C 18 ,C 20 ,C 22 ). Fatty acid with highest content both in LHZZS and XDZZS is eicosanoic acid, the next, hexadecanoic acid. In SLZZS, the normal fatty acids are absolutely dominant compositions, hexadecanoic acid with the highest content, the next, benzoic acid; Tricyclic diterpanoic acids and pentacyclic triterpanoic acids, such as dehydroabietic acid, pimaric acid, isopimaric acid, sandaracopimaric acid, tetrahydroabietic acid, abietic acid,C 32 and C 33 hopanoic acid, etc., exist in the combined acid for each sample, but compared with free acid fraction of brown coal resin, especially in LHZZS and XDZZS, the amount is quite lower, which made the huge difference between free acid fraction and combined acid fraction; there are more branched fatty acids and benzoic acid, phenolic compounds in SLZZS. From the chemical constituents and their distribution characteristic of combined acid, free acid and hydrocarbon fraction, it can be concluded that the original plants and the existing environment of Liaohu brown coal wax is much similar to that of Xundian brown coal wax, but basically different from the resource of Shulan brown coal wax.