Utilization of Hemicelluloses to Cellulose Acetate

利用半纤维素生产醋酸纤维素

• 批准号: 07556102
• 负责人: SAKA Shiro
• 金额: $ 1.73万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07556102/
• 关键词: Low-grade softwood dissolving pulp; Low-grade hardwood dissolving pulp; alpha-cellulose; Acety lation reaction system; Insoluble residues; Cellulose acetate; Hemicelluloses; Useful utilization of resources; 酸化反応系; 三酢酸セルロース(CTA); キシランジアセテート(XDA)

The low-grade wood dissolving pulps with alpha-cellulose content below 90% were studied to prepare cellulose acetate and problems in their preparation and their remedies were studied. To do so, the low-grade softwood sulfite dissolving pulp (alpha-cellulose content, 87.5%) and hardwood prehydrolyzed Kraft pulp (alpha-cellulose content, 89%) were acetylated in the reaction system with acetic acid/acetic anhydride/sulfuric acid as will as that with an addition of organic solvent, and insoluble residues and soluble portions were studied for their characterization. As a result, atransmittance was achieved in their solution as high as that from high-grade dissolving pulps. Additionally, obtained cellulose triacetate was good in its thermal stability. These findings imply that hemicellulose acetates do not make cellulose acetate inferior in its properties and that they canbe used together with cellulose acetate. These lines of results are satisfactory for useful utilization of wood resources, but are based on small-scale experiments. Therefore, more practical preparation of cellulose acetate with a pilot plant will be becessary to investigate.In the future, global shortage of lorest resources will be more and more serious. Therefore, apractical sludies for effective use of biomass on earth will be desired for appropriate chemical conversion of biomass resources to cellulose acetates.

研究了用α-纤维素含量低于90%的低级木材溶解浆制备醋酸纤维素，并对制备过程中存在的问题及解决方法进行了探讨。为此，低级针叶木亚硫酸盐溶解浆（α-纤维素含量，87.5%）和阔叶木预水解硫酸盐浆（α-纤维素含量，89%）在反应体系中用乙酸/乙酸酐/硫酸乙酰化，将与添加有机溶剂，和不溶性残留物和可溶性部分的表征进行了研究。其结果是，在其溶液中实现了与高级溶解浆一样高的透过率。此外，所得三醋酸纤维素具有良好的热稳定性。这些发现意味着半纤维素乙酸酯不会使纤维素乙酸酯的性能变差，并且它们可以与纤维素乙酸酯一起使用。这些结果对于木材资源的有效利用是令人满意的，但是是基于小规模的实验。因此，更实用的醋酸纤维素制备中试研究是必要的。因此，有效利用地球上的生物质的实用污泥将被期望用于生物质资源向乙酸纤维素的适当化学转化。

项目成果

S.Saka, K.Takanashi and H.Matsumura: "Effects of the solvent addition to acetylation medium on cellulose triacetate prepared from low-grade hardwood dissolving pulp." Journal of Applied Polymer Science. (in press). (1998)

S.Saka、K.Takanashi 和 H.Matsumura：“乙酰化介质中添加溶剂对由低级硬木溶解浆制备的三醋酸纤维素的影响”。

S.Saka, K.Takanashi and H.Mutsumura: "Effects of the Solvent Addition to Acetylation Medium on Cellulose Triacetate Prepared from Low-grade Hardwood Dissolving Pulp." Journal of Applied Polymer Science. (掲載予定). (1998)

S.Saka、K.Takanashi 和 H.Mutsumura：“乙酰化介质中添加溶剂对低级硬木溶解浆制备的三乙酸纤维素的影响”（即将出版）。

S.Saka and K.Takanashi: "Cellulose Triacetate prepared from Low-grade Hardwood Dissolving Pulp and its Insoluble Residues in Acetylation mediums." Journal of Applied Polymer Science. 67. 289-297 (1998)

S.Saka 和 K.Takanashi：“由低级硬木溶解浆制备的三乙酸纤维素及其在乙酰化介质中的不溶性残留物。”

S.Saka and K.Takanashi: "Cellulose Triacetate prepared from Low-grade Hsrdwood Dissolving Pulp and its lnsoluble Residues in Acetylation mediums." Journal of Applied Polymer Science. 67. 289-297 (1998)

S.Saka 和 K.Takanashi：“由低级 Hsrdwood 溶解浆制备的三醋酸纤维素及其在乙酰化介质中的不溶性残留物。”

S.Saka and K.Ohmae: "Thermal properties of cellulose triacetate as prepared from low-grade dissolving pulp." Journal of Applied Polymer Science. 62. 1003-1010 (1996)

S.Saka 和 K.Ohmae：“由低级溶解浆制备的三醋酸纤维素的热性能。”