煤精制软沥青庚烷可溶组的结构表征

以高温煤焦油为原料,蒸馏至280℃得软沥青,采用溶剂萃取沉降法得精制软沥青,其软化点为32℃;以庚烷为溶剂超声萃取得庚烷溶物。蒸气压渗透法测定庚烷溶物平均相对分子质量为202;元素分析与平均分子量结合得其平均分子式为C15.66H11.10S0.044O0.049,杂原子含量总和小于1;红外分析结果表明:其杂原子氧以R-O-R,Ar-O-R结构存在,氮以R-NH-R和-N=结构存在,且以-N=为主;采用改进的Brown-Lander模型得其平均结构:三元稠环;紫外分析表明,线性排列为主、面性排列为辅,即样品的化学结构应以渺位缩合为主,迫位缩合为辅。

Structural Characterization of Heptane Solubles from Coal Tar Refined Soft Pitch

Refined soft pitch with soft point of 32℃ was obtained by distillation at 280℃ from high temperature coal tar,and then by solvent extraction and subsequent settlement method.The heptane solubles was obtained by extraction with heptane,and the relative average molecular weight was measured by VPO to be 202.The average molecular formula was C15.66H11.10S0.044O0.049,and the total content of heteroatoms was less than 1.IR analytic result showed that the heteroatom O was existed in R-O-R and Ar-O-R structure,and the heteroatom N was existed in R-NH-R and-N=moieties,among which the latter was primary.The average structure was obtained by improved Brown-Lander model to be three-membered condensed rings.UV analysis indicated that the majority was linear arrangement,and the minority was surface arrangement,namely,the products were mainly cata-condensed structure,and the minority was in peri-condensation.