CAJ | 학술논문

为了提高生物质乙醇木质素的反应活性，采用水热法在四种不同碱性条件下对生物质乙醇木质素进行催化活化处理。运用傅里叶变换红外光谱（FTIR）、核磁共振氢谱（1 H-NMR）、凝胶色谱（GPC）和有机元素分析手段研究了生物质乙醇木质素被四种碱（NaO H ，KO H ，K2 CO3和Na2 CO3）催化活化前后木质素的化学结构以及组分变化。FTIR结果表明生物质乙醇木质素碱经处理后，木质素的酚羟基特征吸收峰1375 cm -1都有明显增大趋势，醚键振动吸收峰1116 cm -1减弱，1597和1511 cm-1处苯环骨架振动吸收峰强度变化很小；1 H-NMR分析结果表明酚羟基含量都有增大趋势，增加顺序为：KOH ＞ NaOH ＞ K2CO3＞Na2 CO3，其中KOH处理后的木质素酚羟基含量增加量为原木素的170％。这由于离子半径大的钾离子更容易与木质素β-O-4醚键上的氧形成加和物，进而发生醚键断裂反应，生成新的酚结构衍生物。G PC 表明生物质乙醇木质素碱处理后分子量分布向低分子区域扩展，数均和重均分子量减小。元素分析结果显示木质素经过水热反应处理后，C含量都有所增加，而H和O含量则降低了，表明木质素经水热反应处理过程中有脱羧基作用，同时蛋白质的含量也有所降低，提高了木质素的纯度。这都有利于直接将木质素用于制备酚醛树脂胶黏剂。
위료제고생물질을순목질소적반응활성，채용수열법재사충불동감성조건하대생물질을순목질소진행최화활화처리。운용부리협변환홍외광보（FTIR）、핵자공진경보（1 H-NMR）、응효색보（GPC）화유궤원소분석수단연구료생물질을순목질소피사충감（NaO H ，KO H ，K2 CO3화Na2 CO3）최화활화전후목질소적화학결구이급조분변화。FTIR결과표명생물질을순목질소감경처리후，목질소적분간기특정흡수봉1375 cm -1도유명현증대추세，미건진동흡수봉1116 cm -1감약，1597화1511 cm-1처분배골가진동흡수봉강도변화흔소；1 H-NMR분석결과표명분간기함량도유증대추세，증가순서위：KOH ＞ NaOH ＞ K2CO3＞Na2 CO3，기중KOH처리후적목질소분간기함량증가량위원목소적170％。저유우리자반경대적갑리자경용역여목질소β-O-4미건상적양형성가화물，진이발생미건단렬반응，생성신적분결구연생물。G PC 표명생물질을순목질소감처리후분자량분포향저분자구역확전，수균화중균분자량감소。원소분석결과현시목질소경과수열반응처리후，C함량도유소증가，이H화O함량칙강저료，표명목질소경수열반응처리과정중유탈최기작용，동시단백질적함량야유소강저，제고료목질소적순도。저도유리우직접장목질소용우제비분철수지효점제。
In order to improve the reaction activity of bioethanol lignin ,we investigated the activation of bioethanol lignin by a hydrothermal treatment method .Catalytic hydrothermal treatment of bioethanol lignin was performed at 180 ℃ for 3 h in the presence of alkaline solutions (NaOH ,Na2CO3 ,KOH and K2CO3 ) ,the change in bioethanol lignin structures was studied com-paratively by FTIR ,1 H NMR ,GPC and elemental analysis .FTIR spectra showed that after alkali hydrothermal treatment ,the band at 1 375 cm-1 attributed to the phenolic hydroxyl groups increased ,and the band intensity at 1 116 cm-1 attributed to the ether bond decreased .On the other hand ,the band at 1 597 and 1 511 cm -1 attributed to aromatic skeletal vibration remained al-most unchanged .1 H NMR spectra showed that after alkali hydrothermal treatment ,the number of aromatic methoxyl is in-creased ,and based on the increment of the content of phenolic hydroxyl ,the catalytic activity can be ranked as follows :KOH>NaOH>K2CO3 >Na2CO3 .Especially for KOH ,the increment of the content of phenolic hydroxyl was 170% ,because the ion radius of potassium cation is bigger than sodium cation ,so the potassium cations more easily formed cation adducts with lignin . GPC results showed that the molecular weight of alkali hydrothermal treatment lignin decreased and the molecular distribution got wider .Elemental analysis showed that hydrothermal treatment could break the interlinkage between lignin and protein , which can reduce the protein content and increase the purity of lignin ,meanwhile ,the content of O and H both decreased ,while C fell ,indicating that the bioethanol lignin had suffered a decarbonylation reaction .This is the most benefit of the lignin as a substitute for phenol .