褐煤的EDA-DMF萃取和加氢液化性能

INVESTIGATION ON THE EDA-DMF EXTRACTION AND HYDROLIQUEFACTION BEHAVIOUR OF LIGNITES

考察了三个褐煤样品的乙二胺(EDA)-二甲基甲酰胺(DMF)萃取物的收率及其组成结构与加氢液化性能的关系。结果表明,萃取率、液化转化率及沥青质产率之间有较好的相关性,且三者均随煤化程度的增加而减少。EDA-DMF萃取物中富集了含短链烷基取代基的芳香族复杂酯(醚)类低分子化合物。推测在液化初期褐煤中—O—和>C=O的裂解和加氢可能起着重要的作用。

The extraction of lignites with the mixture of ethylenediamine (EDA) and dimethylformamide (DMF) (7:3) and their hydroliquefaction behaviour were studied by chemical characterization and CP/MAS ^(13)C-NMR analysis. The results show that when the aromaticlty of lignites increases, the EDA-DMF extract yield, liquefaction conversion and asphaltene yield decrease. Chemical reactions take place between solvents and lignites. The EDA-DMF extract of lignites is mainly complex esters (ethers) with higher aromaticity and less alkyl chains. Therefore C= O and -O- groups in lignites may play an important role in initial stage of hydroliquefaction of lignites.