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ABSTRACT
Study aimed at recovery of lignin from the reused residual liquor of chemical retting bath of coconut fiber caused by partial delignification to make it soft. The lignin of 8.9% was obtained after recovery (maintaining pH 2.0 for 1 h at ambient temperature) and further purification. Extracted lignin is characterized through FTIR, TGA and particle size analysis. FTIR showed absence of polysaccharides in purified lignin. TGA indicates presence of higher methyl-aryl ether groups than aromatic groups in lignin of coconut fibre. Analysis reveals about 91% of particles in the rage of 1–500 µm, which shows its good dispersiblity in fluid. Recovery of lignin associated with two benefits i.e., diversified use of extracted pure lignin and reduction of organic load of the waste liquor to make it suitable for discharge.
摘要
为了使部分脱木素软化，通常使用椰子纤维化学浸渍浴法。本研究旨在从这种再利用残留液中回收木质素。回收后可获得 8.9%的木质素（环境温度保持 pH2.0 1 小时），随后进行纯化。提取的木质素通过 FTIR、TGA 和粒度分析进行表征。FTIR 显示经过纯化的木质素中不存在纤维素和半纤维素。TGA 显示在椰子纤维木质素中甲基-芳基醚基团含量高于芳族基团。分析显示约 91%的颗粒在 1-500μm 范围内，这表明其在流体中具有良好分散性。木质素的回收可带来两个好处：多样化利用提取的纯木质素，减少废液的有机含量以使其适于排放。