This is a pioneer research carried out to investigate the novel use of palm oil mill effluent (POME) as an extraction solvent of lignin and phenolics from oil palm empty fruit bunch fiber (OPEFBF). In the present study, lignin and phenolics were removed from OPEFBF using different solvents, namely POME, sodium hydroxide (NaOH), aqueous ammonia (NH₃), POME containing 5% w/w NaOH (NaOH-POME), and POME containing 5% w/w NH₃ (NH₃-POME) at different temperatures and times. Results obtained suggest that NaOH-POME was the best solvent to produce the highest yield of lignin (24.2±0.36%) and phenolics (2.4±0.1 g L⁻¹). Chemical oxygen demand (COD) of solvent was increased drastically after treatment but reduced substantially after lignin precipitation. The delignified liquor was a rich source of aromatic aldehydes and acids such as hydroxybenzoic acid, syringaldehyde, syringic acid, vanillin, p-coumaric acid, ferulic acid, and trace amounts of hydroxybenzaldehyde and vanillic acid. Utilization of POME as a solvent to extract lignin and phenolics from OPEFBF is recommended as a win-win approach to simultaneously prepare OPEFBF and POME as a feedstock for downstream processes.

Graphical abstract

中文翻译：

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通过一锅法预处理油棕空果束纤维和棕榈油厂废水回收木质素和酚类物质

这是一项开创性的研究，旨在研究棕榈油厂废液（POME）作为从油棕空果束纤维（OPEFBF）中提取木质素和酚类的溶剂的新用途。在本研究中，使用不同的溶剂（即POME，氢氧化钠（NaOH），氨水（NH ₃），含5％w / w NaOH的POME（NaOH-POME）和含5的POME）从OPEFBF中除去了木质素和酚类。NH ₃（NH ₃ -POME）在不同温度和时间的百分比w / w 。所得结果表明，NaOH-POME是产生最高产率的木质素（24.2±0.36％）和酚类（2.4±0.1 g L ^-1）的最佳溶剂。）。处理后，溶剂的化学需氧量（COD）急剧增加，但在木质素沉淀后却大大降低。去木质的液体是芳族醛和酸的丰富来源，例如羟基苯甲酸，丁香醛，丁香酸，香草醛，对香豆酸，阿魏酸和痕量的羟基苯甲醛和香草酸。建议使用POME作为溶剂从OPEFBF中提取木质素和酚类，这是双赢的方法，可同时制备OPEFBF和POME作为下游工艺的原料。

图形概要