中/低温煤焦油悬浮床加氢前后的组成变化

为深入研究中/低温煤焦油全馏分悬浮床加氢行为，对其进行了一系列的高压釜加氢实验，通过常减压蒸馏、组分分离、元素分析来表征其加氢前后组成的变化，并借助平均分子量测定、FT-IR、1H-NMR等手段对加氢前后沥青质的官能团、平均结构参数等方面进行分析。结果表明，煤焦油加氢处理时生焦率低，壁相焦较少，在一定范围内升高反应温度能增加煤焦油的反应深度，但对总生焦量影响不大。加氢产物中的沥青质含量大幅度降低，平均分子量增大，氧含量显著降低，芳碳率增加，缩合度增大；其轻质化效果明显，主要发生环化反应和脱除烷基侧链、羟基氧、醚键氧等反应。

Composition change of medium and low temperature coal tar before and after the slurry-bed hydrocracking

In order to better understand the slurry-bed hydrocracking of medium and low temperature coal tar,a series of experiments were conducted in an autoclave.The composition changes of coal tar before and after hydrocracking were characterized by distillation,SARA fractions,and elemental analysis.The properties of asphaltenes such as structure parameters and functional group were analyzed by FT-IR and 1H-NMR.The results show that the coal tar has a low coking yield in the hydrocracking process,and the reaction depth could be increased by enhancing the reaction temperature in definite range.The asphaltenes content of hydrogenation products is reduced sharply and the oxygen content of asphaltenes decreases,while the average molecular weight,the aromatic-carbon ratio and condensation degree of asphaltenes increase.It has been seen that the cyclization reactions and removal of alkyl side chins and oxygen (especially the oxygen of phenolic hydroxyl and ether group) occur on the asphaltenes during the process of hydrocracking,making most of asphaltenes conversion to light fraction.