A NEW SYNTHESIS PROCESS OF LIGNOSULFONATE USING LIGNIN RECOVERED FROM BLACK LIQUOR OF PULP AND PAPER MILLS

Abstract

Lignosulfonate is an important deriver of lignin, which has many advantages as a surfactant in various fields, for example, in petroleum, printing, construction and agricultural industries. In this study, a new synthesis process of lignosulfonate by two steps were investigated. The results showed that lignosulfonates synthesized by two steps process have similar characteristics and functional groups with lignosulfonates synthesized by one step process. Process by two steps can be easier operated than that by one step, also reaction time and reaction temperature in two steps process were shorter and lower than in one step process.