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造紙黒液提取木質素的研究

時間:2019-06-23 21:58來源:畢業論文
采用酸析法制備木質素,通過酸化,過濾,烘干等方法制備木質素。并且,本論文的主要任務是完成木質素制備及應用

摘要:本論文采用酸析法制備木質素,通過酸化,過濾,烘干等方法制備木質素。并且,本論文的主要任務是完成木質素制備及應用。
本論文首先以難處理的造紙制漿黑液為原料,對木質素的提取、改性方面的應用進行了詳細的實驗與研究。滴加不同濃度的鹽酸和硫酸,通過對比實驗獲得酸的濃度對木質素沉淀的影響以及酸種對木質素沉淀的影響,找出木質素沉淀效果最佳的酸性條件。用鹽酸沉淀比用硫酸沉淀效果好,硫酸易產生泡沫,反應較為劇烈,不易控制。當pH值=3的時候,木質素沉淀可達90%。
同時,本論文進一步對木質素做了研究,用甲醛、亞硫酸鈉還原的方法對得到的木質素進行進一步改性,將木質素改性成為木質素磺酸鈉,用紅外光譜分析儀確證了其結構。36598
畢業論文關鍵詞: 木質素;酸性;造紙黒液;木質素磺酸鈉;紅外光譜
The papermaking black liquid extraction lignin research
Abstract: Waste pulp of paper making brings a big load to the environment, in which the main pollution composition is the lignin. Therefore, extraction lignin in pulping waste liquor, papermaking and chemical modification, synthesis has the industrial application value of the products, not only environmental protection significance, more economic significance.
This paper uses the acid out of lignin prepared by acidification, filtration, drying methods such as the preparation of lignin. And, the main task of this thesis is to complete the preparation and application of lignin.
This paper first to difficult paper pulping black liquor as raw material, the application of the extraction of lignin and modified in detail the experiment and research. Drops with different concentrations of hydrochloric acid and sulphuric acid, acid concentration were obtained through the contrast experiment of the effect of lignin precipitation and acid effects on lignin precipitation, find out the best lignin precipitation acidity conditions. Hydrochloric acid precipitation than using sulfuric acid precipitation effect is good, easy generation sulfate bubble, more violent reaction, not easy to control. When the pH = 3, lignin precipitation can amount to 90%.
源`自!六^維"論^文;網www.aftnzs.live

At the same time, this paper further research is carried out for the lignin, with formaldehyde and sodium sulfite reduction method to further modification of the lignin, the lignin modified become sodium lignin sulfonate, with infrared spectrum analyzer confirmed its structure.
Keywords: lignin;acid;the papermaking;black liquid;Sodium lignin sulfonate;infra-red spectrum(IR spectrum)
目   錄
1 緒論    1
1.1 開題依據    1
1.2 造紙黒液    2
1.2.1 造紙黒液    2
1.2.2 造紙黑液的危害    2
1.2.3 造紙黑液處理現狀    2
1.3 木質素    3
1.3.1 木質素的結構和性質    3
1.3.2 木質素的理化性質    4
1.4 木質素的提取方法    5
1.4.1 堿析法    5
1.4.2 酸析法    5
1.4.3 絮凝沉淀法    6
1.4.4 超濾法    6
1.5 造紙黑液木質素的資源化利用    6
1.5.1 在農業中的應用    6
1.5.2 木質素在工業中的應用    8
1.5.3 木質素在其他方面的應用    10
1.6 課題的來源、研究意義及內容    10
1.6.1 課題的來源    10
1.6.2 課題的研究意義    11
1.6.3 課題的研究內容    11
2 實驗部分    12
2.1 實驗原料與儀器設備    12
2.1.1 實驗原料    12 造紙黒液提取木質素的研究:http://www.aftnzs.live/huaxue/20190623/35115.html
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