Abstract:
This paper studied the liquefaction of lignin in supercritical methanol under the condition of different reaction temperature,reaction time,mass of catalyst and solid-liquid ratio.It studied the interaction of lignin liquefaction by designed 24 factors.The single-factor experiment showed that when the ratio of catalyst to lignin was 16.7%,the liquefaction rate of lignin was the highest.The increase of reaction time and reaction temperature promoted the lignin liquefaction,but when increased the ratio of liquid to solid decreased the rate of lignin liquefaction.The interactional influence occurred only among the reaction temperature,reaction time and solid-liquid ratio.The result showed that reaction temperature (A)>reaction time (B)>interaction of solid-liquid ratio (D) and B>mass of catalyst (C)>interaction of B and C>interaction of A and C>interaction of C and D> interaction of A and D.The most important condition was reaction temperature and the most conversion of lignin was 85%.The fitting formula by using Design-Expert V8.0.6 was Conversion=61.53+8.17A+1.92B-0.99C+3.125×10-3D+0.23AB-0.71AC-0.53AD-0.76BC+1.06BD-0.60CD.