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Com o objetivo de utilizar efetivamente um sub-produto de material nao madeireiro, foi extraida lignina do bagaco de cana-de-acucar via acidificacao do licor negro. A lignina extraida do bagaco da cana-de-acucar (EBL) foi modificada por oxidacao, hidroximetilacao e sulfonacao em um lignossulfonato soluvel em agua (EBL-M). O composto foi caracterizado por IR, UV, GPC e analise elementar. Os resultados mostraram que as unidades aromaticas do EBL-M foram mantidas e efetivamente sulfonadas e que a porcentagem de S foi alta (7,82%). A eficiencia de dispersao de EBL-M para formulacoes pesticidas foi comparada com dispersantes comerciais via medicao da frequencia de suspensao. Como esperado, EBL-M mostrou a mesma eficiencia de outros lignossulfonatos comerciais para dispersar kinsperse, quando usados para grânulos de dimetomorfe dispersiveis em agua. A caracterizacao atraves do peso molecular e do teor de lignossulfonatos no grupo sulfonico, sugeriu que a eficiencia dispersante aumentou com o maior teor de grupo sulfonico e maior peso molecular. Quando usado para grânulos de tribenuron dispersiveis em agua, a eficiencia dispersante de EBL-M foi muito proxima dos dispersantes comerciais. In order to effectively utilize a by-product of non-wood material, lignin was extracted from sugar cane bagasse via acidification of black liquor. The extracted sugar cane bagasse lignin (EBL) was modified by oxidation, hydroxymethylation, and sulfonation into a water-soluble lignosulfonate (EBL-M). It was characterized by IR, UV, GPC and elemental analysis. The results showed that the aromatic units of EBL-M were kept well and it was effectively sulfonated, that the percentage of S was high as 7.82%. The dispersing efficiency of EBL-M for pesticide formulations was compared with commercial dispersants via suspending rate measurement. As expected, EBL-M had the equal optimal dispersing efficiency to kinsperse than other commercial lignosulfonates when being used for dimethomorph water dispersible granules. The characterization of molecular weight and sulfonic group’s content of lignosulfonates suggested that the dispersing efficiency increased with higher sulfonic group’s content and higher molecular weight. As to being used for tribenuron water dispersible granules, the dispersing efficiency of EBL-M was much close to the commercial dispersants.

Extraction of lignin from sugar cane bagasse and its modification into a high performance dispersant for pesticide formulations