摘要
本文对煤加氢液化产物用三种方法分离,并采用液相色谱、核磁共振波谱等对其进行各种参数的测定。从结构解析出发,比较了几个烟煤液化过程中产物的特性变化及可能发生的一些化学反应。结果表明,加氢液化过程中,三种烟煤所得油品主要由三环以下芳烃组成。反应温度升高,油品中H/C原子比增加;结构参数H_(a1)、σ增加,且f_a下降;族组成中低环芳烃增加,多环芳烃减少,饱和烃有所增长。表明在液化过程中发生了以芳香烃加氢饱和化为主的反应。在试验体系中,反应温度与煤浆流量相比,前者是影响油品提质的主要因素。液化油组成与所选择的工艺条件有关,并不随所用煤种发生明显变化。
The coal-derived products obtained from three Chinese bituminous coals by hydroliquefaction were separated into simple fractions. The liquefaction products were investigated by GC, LC, VPO and NMR. Based on the analysis of structure and composition, the changes in the chemical nature of the liquefaction products under different reaction conditions were discussed and some chemical reactions that could occur during liquefaction process were suggested, which could give better under standing to the mechanism of coal liquefaction and help to choose the optimum condition for the coal hydroliquefaction.The results show that the main compounds are mono-di-aromatics (about 80%) in the light oil and mono-,di-tri-aromatics(more than 80%) in the syncrude oil from three bituminous coals. Upon increasing temperature during liquefaction, the monoaromatics increase and polyaromatics decrease substantially, but saturates increase only to a small extent. It is possible that saturation of the aromatic nuclei proceeds more rapidly than the hydrocracking of aliphatics. The increase of the value of structural parameter such as σ, H_(?) and the decrease of aromaticity f_a imply that the saturation and alkyl-substitution of the aromatic ring are the main reactions under the mild reaction conditions. Results also show that the composition of coal-derived oil appears to be more closely related to the liquefaction conditions rather than to the type of coal used. The temperature has a profound effect on oil quality as measured by H/C atomic ratio, in comparison with slurry flow rate.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1991年第1期41-48,共8页
Journal of Fuel Chemistry and Technology
关键词
煤
加氢
液化
分离
化学特性
coals
hydroliquefaction
separation of products
chemical nature
