The purpose of this study is to find the delignification rate equation of pennisetum (napier grass) by Soda pulping method. The initial concentration of sodium hydroxide is 1M. The ratio of liquor to oven dry pennisetum is 6:1. The reaction liquor is healed to any desired temperature of 120℃, 130℃, 140℃, or 150℃ in 60 minutes and keeps it at that temperature for further tests. A reaction rate equation is proposed and their parameters-activation energy frequency factor and reaction orders are determined by experiments. The result shows the reaction order for lignin is 1.2, and is about 1 for sodium hydroxide.
