Stepwise removal of lignin and silica from rice straw by weak alkali -oxygen cooking

弱碱-氧蒸煮逐步去除稻草中的木质素和二氧化硅

• 批准号: 13556056
• 负责人: MESHITSUKA Gyosuke
• 金额: $ 7.3万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13556056/
• 关键词: lignin; rice straw; biomass; chemical pulp; oxygen; silica; methoxyl group; オゾン; パルプ

Silica removal from the rice straw during pulping was dependent on the pH of the cooking liquor. As far as strong alkali is used for the delignification, dissolution of silica into the cooking liquor cannot be avoided. In order to control the silica removal from rice straw during pulping, oxygen-sodium sulfite pulping and oxygen-ammonia pulping were examined. It was found that a high retention of silica in pulp with very low lignin content could be achieved by these pulping methods. The applicability of weak alkali for delignification from rice straw created an interest in examining the structure of what was determined as lignin in rice straw. It was suggested that typical methods for the determination of lignin in wood such as Klason method and others, when applied to non-woody cell wall, could overestimate the amount of lignin significantly.Delignification with higher carbohydrate yield can be achieved by oxygen-sodium sulfite pulping. This was attributed to a less degradation of hemicellulose during the pulping by this method. Based on these results, two stage pulping method consisting of delignification stage followed by silica removal stage was proposed.

稻草制浆过程中二氧化硅的去除取决于蒸煮液的pH值。只要强碱用于脱木质素，二氧化硅溶解到蒸煮液中是不可避免的。为了控制稻草制浆过程中二氧化硅的脱除，对稻草氧-亚硫酸钠法制浆和氧-氨法制浆进行了研究。结果表明，采用这些制浆方法，可以在木素含量很低的纸浆中获得高的二氧化硅留着率。弱碱性对稻草脱木质素的适用性引起了人们对检查稻草中被确定为木质素的结构的兴趣。结果表明，Klason法等木质素测定方法在测定非木质细胞壁中木质素含量时，会明显高估木质素的含量，氧-亚硫酸钠法制浆可实现高碳水化合物得率的脱木质素。这归因于通过该方法在制浆过程中半纤维素的较少降解。在此基础上，提出了脱木素-脱硅两段法制浆工艺。

项目成果

Hikaru Aimi 他2名: "Structure of small lignin fragment retained in water soluble polysaccharide extracted from MWL isolation residue"J.Wood Science. (in press). (2004)

Hikaru Aimi 和其他 2 人：“从 MWL 分离残渣中提取的水溶性多糖中保留的小木质素片段的结构”J.Wood Science（出版中）。

Keiichi Koda, 他4名: "Oxidative cleavage of lignin aromatics during chlorine bleaching of kraft pulp"J.Wood Science. 47・5. 362-367 (2001)

Keiichi Koda 等 4 人：“硫酸盐纸浆氯漂白过程中木质素芳族化合物的氧化裂解”J.Wood Science 47・5 (2001)。

Iori Tomoda, Yuji Matsumoto, Gyosuke Meshitsuka.: "Semi-quantitative Method to Evaluate the α-Carbonyl Content in Lignin. Accepted for the inclusion in 2004 issue of"J. Wood Science. (accepted). (2004)

Iori Tomoda、Yuji Matsumoto、Gyosuke Meshitsuka.：“评估木质素中 α-羰基含量的半定量方法。接受收录于 2004 年《木材科学》杂志（已接受）。

Hiroyuki Shintani 他2名: "The Structural Characteristics of High Molecular Weight Chlorolignin Produced by Chlorine Bleaching of Kraft Pulps"Japan TAPPI Journal. 57(12). 104-110 (2003)

Hiroyuki Shintani 等 2 人：“硫酸盐纸浆氯漂白生产的高分子量氯木素的结构特征”日本 TAPPI 期刊 57(12) (2003)。

Hikaru Aimi 他2名: "Structure of small lignin fragment retained in water-soluble polysacch from MWL isolation residue"J.Wood Science. (printing). (2004)

Hikaru Aimi 和其他 2 人：“来自 MWL 分离残渣的水溶性多糖中保留的小木质素片段的结构”J.Wood Science（印刷）。