煤直接液化中油煤浆热溶产物的13C NMR研究

研究油煤浆热溶产物的成分及含量的变化是控制煤直接液化工艺的重要因素之一. 本文采用固体核磁共振研究了在高压釜中用不同溶剂在不同温度下（250~370 ℃）得到的神华煤及其热溶产物的一些变化规律. 通过对神华煤及其热溶中间产物与抽余煤的¹³C CP/MAS/TOSS NMR分析可知, 神华煤经热溶处理后, 脱除了一些含氧官能团以及某些脂肪烃结构. 同时, 一些芳香桥碳分子和被取代的芳香碳环发生了断裂, 随着反应温度逐渐升高, 由于不断供氢, 四氢呋喃抽提物的芳香度逐渐降低, 抽提率逐渐增大. 

Thermally Dissolved Products of Coal-oil Slurry During Direct Coal Liquefaction Studied by NMR Spectroscopy

Studying the composition of product of thermally dissolved coal oil slurry can provide important information on how to control direct coal liquefaction. In this study, Shenhua coal was thermally dissolved in an autoclave using different solvents at different temperatures (250~370 ℃). Solid state ¹³C CP/MAS/TOSS NMR spectroscopy was used to analyze Shenhua coal, its thermally dissolved products and extracted residue. The results showed that thermal extraction removed oxygen-containing functional groups and some aliphatic hydrocarbon in the Shenhua coal, and fractured a fraction of aromatic bridgehead carbons and nonprotonated carbons. Increasing reaction temperature and continuous supply of hydrogen decreased the aromaticity of the THF extract, but increased the extraction yield.