两种西部煤的化学结构及加氢液化性能

Chemical Structure and Hydrogenation Liquefaction Performance of Two Kinds of Western Coal

为探究西部煤的加氢液化反应性能,对新疆淖毛湖煤和内蒙古不连沟煤在间歇高压反应釜中进行了加氢液化实验,借助固体13 C-NMR和FTIR分析手段,对比研究了不同类型碳和官能团在两种煤及反应中间产物沥青质(PAA)中的分布.结果发现:淖毛湖煤的转化率和油产率分别为96.33%和47.86%,明显高于不连沟煤的转化率(76.18%)和油产率(23.44%).煤中脂肪碳和芳香碳所占比例是造成加氢液化反应转化率差异的主要因素,脂肪类和芳香类官能团的含量与反应性的关系分别呈正相关和负相关;液化油产率与原料煤中亚甲基碳和次甲基碳含量有关;与原煤相比,沥青质中的脂肪碳比例减少而芳香碳比例增加,说明脂肪碳是加氢过程中发生裂解加氢的主要活性结构.

In order to study the hydrogenation liquefaction reactivity of western coal,liquefaction experiments of Naomaohu（NMH）coal and Bulian＇gou（BLG）coal were carried out in high pressure batch autoclave.FTIR and ^（13）C-NMR were used to study the distribution of functional groups and different kinds of carbon in the coal and the pre-asphaltene and asphaltene（PAA）.The results show that the conversion rate and the oil yield of NMH is 96.33% and47.86%,respectively,which is significantly higher than 76.18%and 23.44% of BLG.The proportion of aliphatic carbon and aromatic carbon in coal is the main factor affecting the conversion rate of hydrogenation liquefaction.The proportion of aliphatic functional groups is positively correlated with the reactivity while the proportion of aromatic functional groups has negative effect.High methylene carbon and methane carbon content are favorable to oil yield.The aliphatic carbon content in PAA is lower than that in raw coal,which indicates that the aliphatic carbon is the active structure in hydrogenation liquefaction process.