【正文】 畢 業(yè) 論 文題 目： 木質(zhì)素的分級分離及其性能研究 學(xué)院： 化學(xué)化工學(xué)院 專業(yè)： 生物工程 班級：0402 學(xué)號： 202206030207學(xué)生姓名： 劉 輝 導(dǎo)師姓名： 謝 濤 完成日期： 2022 年 6 月 14 日 目 錄中文摘要 .....................................................................................................................................IABSTRACT...............................................................................................................................II1 前言.......................................................................................................................................1 國內(nèi)外木質(zhì)素研究概況及其現(xiàn)狀...............................................................................1 木質(zhì)素的分離方法及其不足.......................................................................................1 本課題立題依據(jù)...........................................................................................................1 本課題研究目的.................................................................................................1 本課題主要研究任務(wù).........................................................................................22 實驗材料與方法...................................................................................................................3 實驗材料與儀器.........................................................................................................3 實驗原料.............................................................................................................3 實驗設(shè)備.............................................................................................................3 實驗試劑.............................................................................................................3 實驗方法.......................................................................................................................4 竹材成分測定.....................................................................................................4 堿性過氧化物法分離木質(zhì)素.............................................................................4 紅外光譜特征的測定.........................................................................................43 結(jié)果與分析...........................................................................................................................6 原料化學(xué)成分................................................................................................................6 工藝條件的優(yōu)化...........................................................................................................6 氫氧化鈉濃度對木質(zhì)素的影響.........................................................................6 雙氧水濃度對木質(zhì)素的影響.............................................................................7 溫度和反應(yīng)時間對木質(zhì)素的影響.....................................................................7 木質(zhì)素分級組分的得率與表觀特征.................................................................8 木質(zhì)素分級分離工藝對不同原料的適應(yīng)性.....................................................9 分級組分的紅外光譜特征.........................................................................................104 討論.....................................................................................................................................155 結(jié)論.....................................................................................................................................19參考文獻...................................................................................................................................20致 謝.........................................................................................................................................22附圖...........................................................................................................................................23 化學(xué)化工學(xué)院 08 屆本科畢業(yè)論文木質(zhì)素的分級分離及其性能研究摘要：以竹子、竹筍、竹筍殼為原料，對木質(zhì)素的分級分離工藝條件進行了研究，并檢測了木質(zhì)素分級組分的紅外光譜特征。通過單因素實驗確定了木質(zhì)素較優(yōu)的分級分離條件：溫度為 75℃、反應(yīng)時間 3 h、NaOH 濃度為 %、H 2O2 濃度為 %；用沉淀法分離木質(zhì)素，操作條件為：pH≤，溫度≥60℃。在上述條件下木質(zhì)素的提取率達到90%，且純度較高，對分級分離的附屬產(chǎn)品半纖維素和纖維素的破壞性較小。紅外光譜特征分析表明：木質(zhì)素Ⅰ、Ⅱ、Ⅲ、Ⅳ四種組分中均不含纖維素成分，且半纖維素與木質(zhì)素的結(jié)合鍵也發(fā)生了斷裂；木質(zhì)素Ⅰ中半纖維素的分離比較完全，而木質(zhì)素Ⅱ、Ⅲ、Ⅳ中可能吸附了少量半纖維素成分；木質(zhì)素Ⅰ為愈創(chuàng)木酚基紫丁香基對羥基苯基木質(zhì)素（GSH） ，而木質(zhì)素Ⅱ、Ⅲ、Ⅳ則為愈創(chuàng)木酚基 紫丁香基木質(zhì)素（GS ） 。關(guān)鍵詞： 木質(zhì)素；分級分離；紅外光譜特征 化學(xué)化工學(xué)院 08 屆本科畢業(yè)論文IFractional Separation of Lignin and Its Physicalchemical PropertiesAbstract：Using bamboo, bamboo shoots, bamboo shoots shell as raw materials, the lignin fractional separation technological conditions were studied, and the infrared spectrum characteristic of lignin graduation ponents were examine