Method of preparing 4-methyl-5-hydroxymethyl-imidazole
    7.
    发明授权
    Method of preparing 4-methyl-5-hydroxymethyl-imidazole 失效
    制备4-甲基-5-羟甲基咪唑的方法

    公开(公告)号:US4189591A

    公开(公告)日:1980-02-19

    申请号:US6533

    申请日:1979-01-25

    IPC分类号: C07D233/54 C07D233/64

    CPC分类号: C07D233/64

    摘要: The yield of 4-methyl-5-hydroxymethyl-imidazole from the known reaction between formaldehyde and 4-methyl-imidazole can be increased greatly if the reaction is performed in a concentrated aqueous medium at pH 11-13.5, preferably 12-13.5, at a temperature of 20.degree.-60.degree. C., preferably 30.degree.-40.degree. C., with an amount of formaldehyde not exceeding 1.5 mole per mole of 4-methyl-imidazole.

    摘要翻译: 如果反应在pH 11-13.5,优选12-13.5的浓缩水性介质中进行,甲醛和4-甲基 - 咪唑之间已知反应的4-甲基-5-羟甲基咪唑的产率可大大提高 温度为20°-60℃,优选30°-40℃,甲醛量不超过1.5摩尔/摩尔4-甲基 - 咪唑。

    Process for the simultaneous production of fructose and gluconic acid
from glucose-fructose mixtures
    9.
    发明授权
    Process for the simultaneous production of fructose and gluconic acid from glucose-fructose mixtures 失效
    从葡萄糖 - 果糖混合物同时生产果糖和葡萄糖酸的方法

    公开(公告)号:US4242145A

    公开(公告)日:1980-12-30

    申请号:US13634

    申请日:1979-02-21

    CPC分类号: C07C51/235

    摘要: A process for the simultaneous production of fructose and of gluconic acid from glucose-fructose mixtures and/or from invert sugar by the selective oxidation of the glucose proportion, wherein oxygen and/or air, activated by noble metal catalysts, are utilized as the oxidizing agents; the oxidation is conducted in a pH range of about 8 to 10; and the oxidation is terminated after the formation of 1 equivalent of carboxylic acid per mole of glucose employed.The thus-obtained gluconic acid can subsequently be separated from the unchanged fructose in a simple way and practically quantitatively, and can be isolated as the salt.

    摘要翻译: 通过选择性氧化葡萄糖比例从葡萄糖 - 果糖混合物和/或转化糖同时生产果糖和葡萄糖酸的方法,其中使用贵金属催化剂活化的氧和/或空气用作氧化 代理人 氧化在约8至10的pH范围内进行; 并且在每摩尔所用葡萄糖形成1当量羧酸之后终止氧化。 由此获得的葡糖酸可以以简单的方式和实际上定量的方式与不变果糖分离,并且可以作为盐分离。