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. | Journal of Science and Technology 54 (4B) (2016) 1-10 A NEW SYNTHESIS PROCESS OF LIGNOSULFONATE USING LIGNIN RECOVERED FROM BLACK LIQUOR OF PULP AND PAPER MILLS Nguyen Truong Giang1, Tran Trung Kien2, Nguyen Thi Hoa2, Pham Van Thiem2 1 2 National University of Civil Engineering (NUCE), 55 Giai Phong, Hanoi School of Chemical Engineering – Hanoi University of Science and Technology (HUST), 1 Dai Co Viet, Hanoi * Email: truonggiangnuce@ Received: 15 August 2016; Accepted for publication: 10 November 2016 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. Keywords: Lignin, lignosulfonat, methylsulfonation. 1. INTRODUCTION Annually in Vietnam, the pulping and papermaking processes have created a large amount of black liquor, is a kind of difficult to treat industrial wastewater. Lignin, the main component and coloring material of black liquor, is a new organic resource that can be recovered and used in the production of value-added products. However low solubility in water of lignin is its main challenges, hinder its applications. Therefore, modification of lignin is required to improve its potential application in industrials Modification of lignin is a challenge as structure of lignin is complex [1]. Many modifications were studied, in which methyl sulfonation process had high efficiency to increase activity of lignin and create the lignosulfonates that have high water
