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題名 | 處理條件對酚液化木質素性質之影響=Effects of Treatment Conditions on the Properties of Phenol-liquefied Lignin |
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作者 | 張國峻; 許玲瑛; 李文昭; 曾益民; | 書刊名 | 林產工業 |
卷期 | 29:3 2010.09[民99.09] |
頁次 | 頁183-192 |
分類號 | 436.51 |
關鍵詞 | 木質素; 液化處理; 反應性酚物質; 酚; Lignin; Liquefation; Reactive phenolic component; Phenol; |
語文 | 中文(Chinese) |
中文摘要 | 本研究將木質素以酚為溶劑進行液化處理,探討液化處理時木質素種類(含鹼木質素、脫鹼木質素、亞硫酸鹽木質素)、酚/木質素重量比(2.5/1、2.0/1、1.5/1)、酸催化劑種類(H_2SO_4、HCl)及添加量(3、5、7%)等不同條件對所得液化木質素性質之影響。由試驗結果得知,木質素以酚為溶劑進行液化處理時可完全溶解,惟所得液化木質素之粘度受木質素種類及液化條件所影響,在液化藥劑中添加10%水可有效降低液化木質素之粘度;木質素之化學組成分可與酚溶劑產生結合而形成衍生物,此液化產物可與甲醛反應而樹脂化。各不同條件液化木質素之重量平均分子量約在3900~4500之間,提高酸催化劑濃度可同時促進木質素之降解及再縮合反應。木質素經液化處理後耐熱性降低,且熱裂解行為較複雜,在700℃之重量保留率降低。 |
英文摘要 | In this study, lignin was liquefied with phenol as a solvent. The effects of the kinds of lignin (alkaline lignin, dealkaline lignin, lignin sulfonate), the weight ratio of phenol to lignin (2.5/1, 2.0/1, 1.5/1) and the kind and the dosage of catalyst (H_2SO_4, HCl and 3, 5, 7%) on the properties of liquefied lignin were investigated. The results show that lignin could be completely dissolved in phenol. However, the viscosity of the liquefied lignin was depended on the kind of lignin and conditions of liquefaction. But when 10% of phenol was substituted with water, the viscosity of liquefied products could be decreased significantly. The chemical components of lignin could combine with phenol to form derivatives that could resinify when reacted with formaldehyde. The liquefied lignin with various conditions had the weight average molecular weight between 3900 and 4500. Increasing the concentration of acid catalyst could promote the decomposition and recondensation of lignin simultaneously. The heat resistance of lignin decreased after liquefaction, which had more complex heat degradation behavior and lower weight retention at 700℃. |
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