Oxidation process for producing polycarboxylates from polysaccharides
    1.
    发明授权
    Oxidation process for producing polycarboxylates from polysaccharides 失效
    用于从多糖制备多羧酸盐的氧化方法

    公开(公告)号:US5856470A

    公开(公告)日:1999-01-05

    申请号:US913797

    申请日:1997-12-29

    摘要: A process for producing polycarboxylic acids or salts thereof by contacting a polysaccharide with nitrogen dioxide and dinitrogen tetroxide at a charging temperature in the range from the boiling point of nitrogen dioxide under a particular pressure to a temperature which is 50.degree. C. higher than said boiling point, oxidizing the primary alcohol groups of the polysaccharide at a temperature which is at least about 10.degree. C. above said charging temperature to convert the primary alcohol groups into carboxyl groups, and optionally, at least partially neutralizing the carboxylic acid groups formed.

    摘要翻译: PCT No.PCT / EP96 / 01065 Sec。 371 1997年12月29日第 102(e)1997年12月29日PCT PCT 1996年3月13日PCT公布。 第WO96 / 29351号公报 日本1996年9月26日一种多元羧酸或其盐的制备方法,其特征在于,在特定压力下的二氧化氮的沸点至50℃​​的温度下,使多糖与二氧化氮和四氧化二氮接触, 高于所述沸点,在高于所述带电温度的至少约10℃的温度下氧化多糖的伯醇基团以将伯醇基团转化为羧基,并且任选地至少部分中和羧酸 酸性基团形成。

    Process for the production of polysaccharide-based polycarboxylates
    3.
    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。

    Production of polysaccharide-based polycarboxylates
    4.
    发明授权
    Production of polysaccharide-based polycarboxylates 失效
    生产多糖类聚羧酸盐

    公开(公告)号:US5959101A

    公开(公告)日:1999-09-28

    申请号:US564117

    申请日:1997-03-18

    CPC分类号: C11D3/223 C08B15/04 C08B31/18

    摘要: A continuous process for the production of polycarboxylic acids or salts thereof from polysaccharides involving contacting a polysaccharide with an oxidizing agent selected from the group consisting of nitrogen dioxide, dinitrogen tetroxide, or an equilibrium mixture thereof in the absence of oxygen at a temperature above 80 .degree.C. and at a pressure of from about 3 bar to about 15 bar absolute and for a tirne period of from about 1 to about 30 minutes to form a reducd gaseous product and a polysaccharide product wherein the primary alcohol groups of said polysaccharide product are at least partially converted to carboxyl groups.

    摘要翻译: PCT No.PCT / EP94 / 01599 Sec。 371日期1997年3月18日 102(e)1997年3月18日PCT PCT 1994年5月17日PCT公布。 公开号WO94 / 28030 日期1994年12月8日从多糖生产多羧酸或其盐的连续方法涉及使多糖与选自二氧化氮,四氧化二氮或其平衡混合物的氧化剂在不存在氧的情况下接触的方法 温度高于80℃,压力为约3巴至约15巴绝对压力和约1至约30分钟的时间,以形成还原气态产物和多糖产物,其中伯醇 所述多糖产物至少部分转化成羧基。

    Process for the production of neutralized polysaccharide-based
polycarboxylates
    9.
    发明授权
    Process for the production of neutralized polysaccharide-based polycarboxylates 失效
    用于生产中和多糖类聚羧酸盐的方法

    公开(公告)号:US5892027A

    公开(公告)日:1999-04-06

    申请号:US913071

    申请日:1997-10-07

    摘要: A process for producing solid polycarboxylic acid salts from polysaccharides with gaseous nitrogen dioxide and dinitrogen tetroxide to at least partially convert the primary alcohol groups of the polysaccharides into carboxyl groups and form a solid polycarboxylic acid and then mixing the polycarboxylic acid with a solid neutralizing agent to at least partially neutralized the carboxylic acid groups of the polycarboxylic acid.

    摘要翻译: PCT No.PCT / EP96 / 00791 Sec。 371日期1997年10月7日第 102(e)日期1997年10月7日PCT 1996年2月27日PCT PCT。 WO96 / 27618 PCT出版物 日期1996年9月12日一种用气态二氧化氮和四氧化二氮从多糖制备固体多羧酸盐的方法,至少部分将多糖的伯醇基团转化为羧基并形成固体多羧酸,然后将多元羧酸与 固体中和剂以至少部分中和多元羧酸的羧酸基团。