本文關(guān)鍵詞： 稻草 亞硫酸氫鎂 蒸煮 制漿　出處：《湖北工業(yè)大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：本文通過對(duì)遼寧地區(qū)稻草原料的分析,并結(jié)合遼寧金城紙業(yè)的實(shí)際生產(chǎn)需要,研究稻草亞硫酸氫鎂制漿的性能。通過單因素實(shí)驗(yàn),篩選出稻草亞硫酸氫鎂蒸煮過程中的主要的影響因子,并對(duì)比了稻草燒堿法與亞硫酸氫鎂法制漿,總結(jié)了燒堿法與亞硫酸氫鎂法制漿各自的優(yōu)缺點(diǎn)。通過對(duì)稻草亞硫酸氫鎂蒸煮反應(yīng)動(dòng)力學(xué)的研究,得出稻草蒸煮反應(yīng)速率常數(shù)隨溫度變化的曲線,最后通過正交實(shí)驗(yàn),得出稻草亞硫酸氫鎂法最佳的蒸煮方案。 稻草的纖維短而細(xì),纖維的組織結(jié)構(gòu)決定其漿中不定形的細(xì)小細(xì)胞較多,非纖維細(xì)胞含量很大,尤以細(xì)碎不整的薄壁細(xì)胞最多。亞硫酸氫鎂法稻草漿較之堿法稻草漿的得率較高,而亞硫酸氫鎂稻草漿的灰分、硅含量比堿法稻草漿的要高,苯醇和熱水抽出物也高于堿法稻草漿。堿法稻草漿中的聚戊糖含量要高于亞硫酸氫鎂法稻草漿。而通過比較兩者的高錳酸鉀值及其克拉森木素含量,再通過紫外測(cè)定酸溶木素的含量得出,亞硫酸氫鎂法稻草漿的高錳酸鉀值及木素總含量要高于燒堿法稻草漿。木素含量高是否還與蒸煮過程木素的縮合有關(guān),有待進(jìn)一步蒸煮歷程研究。 通過對(duì)稻草亞硫酸氫鎂法蒸煮反應(yīng)動(dòng)力學(xué)的研究,得出反應(yīng)速率常數(shù)在100℃～145℃時(shí),反應(yīng)速率常數(shù)變化不大,在145℃～160℃時(shí),反應(yīng)速率常數(shù)迅速增加,得出蒸煮脫木素的有效溫度范圍為145℃～160℃。 研究結(jié)果表明,稻草的亞硫酸氫鎂法的蒸煮最佳條件是A3B2C2D2的條件,即設(shè)置稻草亞硫酸氫鎂法的蒸煮總酸濃度在3.4%,蒸煮的最高溫度為155℃,蒸煮的升溫時(shí)間為100min,蒸煮的保溫時(shí)間控制在90min。蒸煮性能分析:K值15.93;得率45.57%;聚戊糖8.21%;苯醇抽提物2.34%;木質(zhì)素含量1.46%;漂白紙漿的拉力23.55N/15mm;紙張的ISO白度值為78.38%。所得紙漿中,聚戊糖含量的保留使制漿保留一定的強(qiáng)度,且有效的除去了一些易溶于苯醇的有機(jī)物質(zhì)對(duì)紙張的干擾,而且K值的下降使紙漿中的木質(zhì)素含量進(jìn)一步降低,使紙張的白度得到進(jìn)一步改善。
[Abstract]:Based on the analysis of rice straw raw materials in Liaoning area and the actual production needs of Jincheng paper industry in Liaoning Province, this paper studies the properties of rice straw pulping with magnesium hydrogen sulfite. The main factors influencing the cooking process of straw magnesium bisulfite were screened, and the pulping of straw caustic soda and magnesium hydrogen sulfate pulping was compared. The advantages and disadvantages of caustic soda and magnesium bisulfite pulping were summarized. Through the study of the kinetics of straw cooking reaction, the curve of the rate constant of straw cooking with temperature was obtained, and the orthogonal experiment was carried out. The optimum cooking scheme of straw by magnesium hydrogen sulfite method was obtained. The fiber of rice straw is short and thin, and the structure of the fiber determines that there are more amorphous small cells in the plasma, and the content of non-fibrous cells is very large. The yield of magnesium bisulfite straw pulp was higher than that of alkali straw pulp, and the ash content of magnesium hydrogen sulfate straw pulp was higher than that of alkali straw pulp. The content of pentose in alkaline straw pulp was higher than that in magnesium bisulfite straw pulp, and the potassium permanganate value and Klaassen lignin content were compared. The results showed that potassium permanganate and total lignin content of straw pulp by magnesium hydrogen sulfite method were higher than those of rice straw pulp by caustic soda method, and whether the high lignin content was related to the condensation of lignin during cooking. Further study on cooking process is needed. Based on the study of the reaction kinetics of straw cooking with magnesium hydrogen sulfite, the reaction rate constant changed little at 100 鈩，

本文編號(hào)：1511207