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。

    Production of polysaccharide-based polycarboxylates
    5.
    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。

    Oxidation process for producing polycarboxylates from polysaccharides
    6.
    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。

    Water-soluble ethers substituted with alkenyl or alkyl succinic acid
esters
    9.
    发明授权
    Water-soluble ethers substituted with alkenyl or alkyl succinic acid esters 失效
    被烯基或烷基琥珀酸酯取代的水溶性醚

    公开(公告)号:US4906744A

    公开(公告)日:1990-03-06

    申请号:US307211

    申请日:1989-02-03

    摘要: A method for the production of new derivatives of watersoluble cellulose ethers by the reaction of 100 parts by weight of a water-soluble cellulose ether with 3 to 30 parts by weight of C.sub.8-18 alkyl(ene) succinic acid anhydride, in the absence of water and under neutral or acid conditions at elevated temperature, until, in analytically detectable terms, 1 to 8% by weight, based on the cellulose ether, of alk(en)yl succinic acid has reacted with the cellulose molecule; the products of the method; and their use as thickners for aqueous surfactant solutions, dye dispersions, and for hydraulically setting building materials or their use as protective colloids or emulsifiers in the suspension polymerization of water-insoluble monomers in aqueous phase.

    摘要翻译: 通过100重量份的水溶性纤维素醚与3〜30重量份的C 8-18烷基(烯)琥珀酸酐反应制备水溶性纤维素醚的新衍生物的方法,在不存在 水和中性或酸性条件下,在升高的温度下,直到以可分析检测的方式,基于纤维素醚为1至8重量%的烷基(en)基琥珀酸与纤维素分子反应; 方法的产品; 以及它们作为水性表面活性剂溶液的增稠剂,染料分散体,以及水硬性建筑材料的用途,或者它们在水相中水不溶性单体的悬浮聚合中作为保护胶体或乳化剂的用途。

    Process for highly substituted carboxyalkyl celluloses and mixed ethers
thereof
    10.
    发明授权
    Process for highly substituted carboxyalkyl celluloses and mixed ethers thereof 失效
    高度取代的羧基烷基纤维素及其混合醚的方法

    公开(公告)号:US4507474A

    公开(公告)日:1985-03-26

    申请号:US573164

    申请日:1984-01-24

    CPC分类号: C08B11/193 C08B11/12

    摘要: A process for the production of carboxyalkyl celluloses having an average degree of substitution of at least 1.0. The process comprises up to 3 stages, but without any intermediate purification. The preferred suspension medium is isopropanol. In each stage of the process, the carboxyalkylating agent is used in quantities of less than 2.5 moles per mole of anhydroglucose unit and the alkylating agent in quantities of less than 5 moles per mole of anhydroglucose unit. The total water content of the system throughout the reaction as a whole must not exceed 450% by weight, based on the quantity by weight of cellulose used. Water contents of from 80 to 250% by weight are preferred.

    摘要翻译: 平均取代度至少为1.0的羧基烷基纤维素的制造方法。 该方法包括多达3个阶段,但没有任何中间纯化。 优选的悬​​浮介质是异丙醇。 在该方法的每个阶段中,每摩尔葡糖酐单元和烷基化剂的量小于2.5摩尔/摩尔脱水葡萄糖单元,所述羧烷基化剂的用量小于2.5摩尔。 基于所使用的纤维素的重量,整个反应中的系统的总含水量不得超过450重量%。 水含量为80-250重量%是优选的。