Process for the production of polysaccharide-based polycarboxylates
    2.
    发明授权
    Process for the production of polysaccharide-based polycarboxylates 失效
    生产多糖类聚羧酸盐的方法

    公开(公告)号:US5541316A

    公开(公告)日:1996-07-30

    申请号:US256882

    申请日:1994-07-28

    摘要: A process for the production of polycarboxylic acids or salts thereof from polysaccharides by oxidation with nitrogen dioxide/dinitrogen tetroxide with at least partial conversion of the primary alcohol groups of the polysaccharides into carboxyl groups and optionally at least partial neutralization of the carboxylic acid groups formed is provided. The oxidation reaction is carried out in a closed reaction system in the presence of oxygen under pressures of 2 bar to 10 bar and at a temperature above room temperature. Nitrogen dioxide/dinitrogen tetroxide is used in such quantities that, in the event of a theoretically complete shift of the equilibrium onto the nitrogen dioxide side, the nitrogen dioxide is present in quantities of at most 2 mole equivalents, based on the content of monomer unit of the polysaccharide containing one primary alcohol group.

    摘要翻译: PCT No.PCT / EP93 / 00244 Sec。 371日期:1994年7月28日 102(e)日期1994年7月28日PCT提交1993年2月3日PCT公布。 第WO93 / 16110号公报 日期1993年8月19日一种通过用二氧化氮/四氧化二氮氧化至少部分转化多糖的伯醇基团进入羧基的多糖的多羧酸或其盐的制备方法,并且任选地至少部分中和 提供形成的羧酸基团。 氧化反应在封闭的反应体系中,在氧气存在下,在2巴-10巴压力和高于室温的温度下进行。 二氧化氮/四氧化二氮的使用量使得在理论上完全将平衡转移到二氧化氮一侧的情况下,基于单体单元的含量,二氧化氮的存在量最多为2摩尔当量 的含有一个伯醇基团的多糖。