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Separation and Utilization of Woody Biomass by Boilingaqueous Acetic Acid Containing Acid Catalyst.

含酸性催化剂的沸腾乙酸水溶液分离和利用木本生物质。

基本信息

批准号：
01560175
负责人：
SANO Yoshihiro
金额：
$ 1.41万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

Separation and utilization of woody biomass were investigated by aqueous acetic acid of commercial hardwood chips(oak, alder, mangrove)with a catalst of sulfuric acid. When chips were boiled in 90% aqueous acid for 45 min, the chips-were filtrated. After repeated this pretreatment, they were cooked in a new 90% aqueous acetic acid with 0.32-0.40% H_2SO_4 for 3-4 h. Alder was easily pulped, but mangrove was done with a best deal of difficulty and produced a lot of reject. When the reject was repulped under similar conditions, it gave pulps with a good yield. Yields of the combined pulps were about 50% on basis of the starting chips for all of the species.Pulping waste liquor was concentrated under reduced pressure and poured into 5 times volume of water to divide into acetic acid lignins and saccharides. When chips were pulped for 3 h and 4 h under the same conditions, saccharides were recovered in yields of 20% and 15% based on chips, respectively, as reducing sugars. The sugar composition of the saccharides suggested that most of xylose residue in them was composed mainly of monosaccharides. The aqueous solution containing the saccharides showed a dark-brown color. Decoloration of the aqueous solution was carried out effectively with active carbon and synthetic adsorbents. Decoloration by the adsorbents(XAD-2 and XAD-4)was achieved together with cation- and anionexchange resins. XAD-2 or XAD-4 is regenerated by washing with aqueous NaOH, polar-organic solvents such as methanol et al, so may be more effectively.

以工业阔叶木（橡木、桤木、红树林）为原料，在硫酸催化剂作用下，用醋酸溶液分离利用木质生物质。当切片在90%的酸水溶液中煮沸45 min时，过滤切片。重复上述预处理后，在新的90%乙酸水溶液中用0.32- 0.40%H_2SO_4蒸煮3-4 h。桤木很容易制浆，但红树林的制浆难度很大，产生了大量的废品。在相似的条件下再制浆，可得到较好得率的纸浆。所有物种的合并浆的产率约为50%，以起始切片为基础。制浆废液在减压下浓缩，并倒入5倍体积的水中，以分离乙酸木质素和木素。当芯片在相同条件下制浆3小时和4小时，回收的糖的收率为20%和15%，基于芯片，分别为还原糖。木糖残基的糖组成表明，木糖残基主要由单糖组成。含有该化合物的水溶液显示出深棕色。采用活性炭和合成吸附剂对水溶液进行了有效的脱色。脱色的吸附剂（XAD-2和XAD-4）实现了与阳离子和阴离子交换树脂。XAD-2或XAD-4的再生可用NaOH水溶液、极性有机溶剂如甲醇等洗涤，因此再生效果更好。