煤液化油中低级酚生成的影响因素研究

Study on the Influencing Factors of Generation of Lower Phenol in Coal Liquefied Oil

为了探究反应温度、反应压力、催化剂添加量以及供氢溶剂对褐煤直接液化油中低级酚生成的影响以及低级酚生成的机理,利用模型化合物邻苄基苯酚在煤直接液化条件下进行加氢反应。实验结果表明:邻苄基苯酚在液化条件下主要发生桥键断裂反应生成低级酚,苯环不易被加氢饱和。温度升高对促进邻苄基苯酚桥键断裂有利;压力升高则不利于其桥键断裂;铁系催化剂添加量的增加会促进桥键断裂;供氢溶剂四氢萘相比十氢萘会抑制低级酚的生成。邻苄基苯酚加氢液化的产物以苯酚与甲苯为主,邻甲酚与苯相对较少。

The 2-benzyl phenol was treated as a model compound to explore the formation mechanism of lower phenol from coal liquefied oil, and influence of the reaction temperature, pressure, the quantity of catalysts added and hydrogen donor solvent on the generation of lower phenol. The lower phenol generated from the cleavage of 2-benzyl phenol bond and the benzene ring could hardly be hydrogenation-saturated under coal liquefaction conditions. It was found that higher reaction temperature could promote cleavage of 2-benzyl phenol bond, but higher hydrogen pressure couldn＇ t. The iron catalyst was conducive to cleavage of 2-benzyl phenol bond, but the tetralin restrained the generation of lower phenol more than decalin did. The phenol and toluene were the main products of 2-benzyl phenol hydrogenation, while generating little o-cresol and benzene.