Hydrothermal-Controlled Conversion of Black Liquor Acid Sediment Directly to Phenolics

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• 作者：Jiangyong Chu ; Weikun JiangShubin Wu ; Lucian A. Lucia ; Ming Lei
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：31
• 期：2
• 页码：1638-1643
• 全文大小：374K
• ISSN：1520-5029

文摘

This study explored the direct conversion of black liquor acid sediment (BLAS) into phenolics by hydrothermolysis. Experiments were successfully performed in a batch-type reactor at temperature of 260 to ∼340 °C over 0–120 min. Depending on the reaction conditions, four products (bio-oil phase containing most of the phenolics, aqueous phase, char, and a small amount of gas) were formed and analyzed by element analysis, Fourier transform infrared spectroscopy (FT-IR), gas chromatography mass spectrometry (GC-MS), gas chromatography (GC), and pyrolysis-gas chromatography mass spectrometry (Py-GC/MS). The total bio-oil yield was 16–26 wt % based on dry BLAS (D-BLAS), in which the main monomeric compounds were 2-methoxyphenol, 2, 6-dimethoxyphenol, and catechol, with yields of 0.74–1.66, 0.28–4.03, and 0–7.08 wt % based on lignin in the BLAS (BLAS-L), respectively. Analysis of char suggested BLAS-L occurred by hydrothermolytic depolymerization to give aryl-ether linkages (β-O-4 and α-O-4 bonds), hydroxyl and carbonyl groups, and aromatic rings. Finally, the reactions were almost complete because the char had no functional groups of lignin at the optimal reaction condition (300 °C and 30 min).