| 麦草碱木质素的氧化降解及产物特性的研究(Ⅰ) |
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| 引用本文： | 任承霞,李忠正.麦草碱木质素的氧化降解及产物特性的研究(Ⅰ)[J].林产化学与工业,2001,21(4):49-54. |
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| 作者姓名： | 任承霞 李忠正 |
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| 作者单位： | 南京林业大学化学工程学院 江苏南京210037
(任承霞)，南京林业大学化学工程学院 江苏南京210037(李忠正) |
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| 摘 要： | 对不同氧化条件下 ,麦草氧化碱木质素的分子质量、酸溶木质素含量、酚羟基、羧基、甲氧基含量、表面活性的变化进行了研究。研究表明 ,当用碱量较高 (60 % ,30 % )时 ,其分子质量均一化程度较高 ,加入H2 O2 后分子质量 >10 0 0 0的高分子组分含量明显下降 ,但用碱量较低(10 % ,5 % )时则变化不大 ,说明在O2 /H2 O2 氧化时碱有着明显作用。对酸溶木质素含量来说 ,也呈现出这一规律。木质素经氧化后 ,酚羟基含量升高 ,而羧基、甲氧基含量下降。在高用碱量条件 (60 %、30 % )下 ,氧化木质素的表面张力下降较大 ,添加H2 O2 后下降更为明显。当用碱量为60 %、H2 O2 用量 10 %时 ,氧化木质素 4 %水溶液的表面张力可由原木质素的 4 6.8mN/m降至 38.8mN/m。
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| 关 键 词： | 木质素 表面活性 麦草 碱法制浆 黑液 造纸工业 废液 分离 氧化降解 |
OXIDATIVE DEGRADATION CHARACTERISTICS OF THE PRODUCTS OF WHEAT STRAW ALKALINE LIGNIN |
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| REN Cheng xia,LI Zhong zheng.OXIDATIVE DEGRADATION CHARACTERISTICS OF THE PRODUCTS OF WHEAT STRAW ALKALINE LIGNIN[J].Chemistry & Industry of Forest Products,2001,21(4):49-54. |
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| Authors: | REN Cheng xia LI Zhong zheng |
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| Abstract: | This paper discussed the change of molecular weight,content of acid soluble lignin,content of phenolic-OH,-COOH and -OCH 3,surface activity of the oxidative degradation products obtained from wheat straw alkaline lignin under different oxidization conditions.It indicated that when alkaline dosage is high,for example,60% and 30%,the molecular weight polydispersities of oxidized lignin are low.The content of component with molecular weight higher than 10 000 decreases after the addition of H 2O 2.However,when alkaline dosage is low,for example,10% and 5% the polydispersities are high.It indicated that alkalinity has a great influence on lignin oxidation when O 2/H 2O 2 is used as oxidizing agents.As to acid soluble lignin content,the same rule plays,oxidative degradation of lignin results in increase of phenolic hydroxyl,and decrease of carboxyl and methoxyl contents.The surface tensions of oxidized lignin solution decrease very much at high alkaline dosage(60%,30%),and decreases further after addition of H 2O 2.Under condition of alkaline dosage 60%,H 2O 2 dosage 10%,the surface tension of 4% oxidized lignin solution decerases from the original 46.8 mN/m to 38.8 mN/m. |
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| Keywords: | lignin surface activity phenolic hydroxyl carboxyl methoxyl |
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