ZnCl_2催化木质素磺酸盐加氢液化的溶剂效应

Solvent effect of lignosulfonate liquidfaction by ZnCl_2 catalyzed hydrogenation

选用ZnCl2为催化剂在高压反应釜中进行加氢液化反应,利用GC-MS和红外光谱技术,研究溶剂极性及供氢能力对木质素磺酸盐液化产率及产物的影响。产率分析表明,极性溶剂有利于木质素液化转化,供氢溶剂有利于提高轻馏分产率,水溶剂条件下木质素液化转化率最高,甲醇溶剂体系条件下轻馏分产率最高,相对最低液化转化率及轻馏分产率的1,4二氧六环溶剂体系分别提高2.0倍和1.9倍。GC-MS分析表明,中等极性溶剂有利于中间产物溶解稳定,供氢溶剂四氢萘通过释放氢自由基结合稳定中间产物。乙醇溶剂条件下中间产物相对含量是48.76%,相对最低含量水溶剂体系提高2.2倍。红外光谱分析表明,醇类溶剂参与反应,焦油产物羟基峰强度增强。

Select ZnCl2 as catalyst for hydrogenation and liquefaction in the autoclave,study polarity and hydrogen of solvent for the liquefaction yield of lignin sulfonate and products by GC-MS and infrared spectroscopy.Yield analysis shows,solvent＇s polar favor for lignin conversion,hydrogen donor solvent can improve the yield of light distillate,the highest conversion of lignin under water and the highest yield of light distillate under the methanol conditions,increased 2.0-times and 1.9-times compare to lowest yield of 1,4-dioxane solvent;GC-MS analysis showed,medium polarity solvents was well to neutral fraction stability,hydrogen donor solvent tetralin can release of hydrogen to binding and stability the radical intermediates,Ethanol have the neutral product of the relative content of 48.76% relative to the minimum 2.2 times the water solvent systems.Infrared analysis showed,in response to alcohol solvent,tar products of hydroxyl peak intensity increased.