【摘要】 用核磁共振氢谱和红外光潜跟踪了大庆澄清油芳烃组份在液相炭化早期阶段的结构转变。结果表明,多环芳烃分子在热解初期首先脱去环烷上的氢转成芳环,同时发生烷基侧链C_α—C_β键的断裂,形成HS（正己烷可溶）组份。HS组份进一步反应,经烷基链C_α—C_β键断裂而诱发芳核缩合反应,生成更大的芳核分子,并随反应的深入进行,依次生成TS（正己烷不溶甲苯可溶）、PS（甲苯不溶吡啶可溶）及PI（吡啶不溶）等组份。在HS组份部分地转为TS、PS、PI的同时,自身也进一步发生烷基链的断裂。从而在反应中后期形成的TS、PS、PI也表现出烷基侧链的减少。与此同时,PI在生成和积累过程中,发生了脱氢缩合而成更多环数的中间相组份分子,这可从红外光谱1600cm^-1峰强逐渐下降证明。更多还原

【Abstract】 The structural transformation of aromatic fraction of Daqing decantoil during the early stage of liquid phase carbonization has been followedby proton NMR and FT-IR spectroscopy.It was shown that the naphthenicmulti-rings fused on PAH nucleus splitted hydrogen atoms at first andtransformed into aromatic rings.The scission of alkyl C_α—C_β bond occur-red concurrently and the HS fraction was formed.Then the aromatic con-densation which was initiated by alkyl C_α—C_β bond scission led to theformation of molecules with greater aromatic nucleus.And finally the TS,PSand PI fractions were formed.With the successive trnsformation of HS into TS,PS and PI some alkyl fragments were removed from HS molecules,there-by both the n（alkyl substituents per average molecule）and l（averagecarbons per alkyl side-chain）values decreased and some decrease of alkylsubstituents was also revealed in the later produced TS,PS,PI components.In the course of accumulation of PI more giant polyaromatic moleculesconstituting mesophase spherules were formed owing to the dehydroconden-sation of precursor mesophase molecules,as evidenced by the successivedecrease of absorption intensity of 1600 cm^-1band in IR spectra.更多还原