Process of preparation of glyoxylic acid aqueous solution
    4.
    发明授权
    Process of preparation of glyoxylic acid aqueous solution 有权
    乙醛酸水溶液的制备工艺

    公开(公告)号:US08754255B2

    公开(公告)日:2014-06-17

    申请号:US12864394

    申请日:2009-01-21

    IPC分类号: C07C51/235 C07C51/27

    CPC分类号: C07C51/27 C07C59/153

    摘要: The invention relates to a method for preparing an aqueous solution of glyoxylic acid by oxidation of an aqueous solution of glyoxal with oxygen or a gas containing oxygen, in the presence of a catalytic quantity of nitric acid and/or at least one nitrogen oxide, a strong acid not oxidizing glyoxal, and by maintaining conditions satisfying the equation KLa/Q>10, where KLa is the total volumetric mass transfer coefficient and Q is the heat load liberated by the reaction per mole of glyoxal.

    摘要翻译: 本发明涉及一种在催化量的硝酸和/或至少一种氮氧化物的存在下,用氧或含氧气体氧化乙二醛水溶液来制备乙醛酸的水溶液的方法, 强酸不氧化乙二醛,并通过维持满足方程式KLa / Q> 10的条件,其中KLa是总体积传质系数,Q是通过每摩尔乙二醛反应释放的热负荷。

    Method of oxidation using nitric acid
    6.
    发明授权
    Method of oxidation using nitric acid 有权
    使用硝酸的氧化方法

    公开(公告)号:US07692041B2

    公开(公告)日:2010-04-06

    申请号:US11890760

    申请日:2007-08-06

    摘要: A controlled nitric acid process employing oxygen and nitric acid as co-oxidants is used to oxidize organic compounds subject to nitric acid oxidation, to their corresponding carboxylic acids. Oxidation of some carbohydrates by this process can produce one or more of their corresponding acid forms. The process is carried out at moderate temperatures, typically in the range of 20° C. to 45° C. in a closed reactor, with oxygen gas being introduced into the reaction chamber as needed in order to sustain the reaction. Computer controlled reactors allow for careful and reproducible control of reaction parameters. Nitric acid can be recovered by a distillation/evaporation process, or by diffusion dialysis, the aqueous solution made basic with inorganic hydroxide, and the residual inorganic nitrate removed using a filtration (nanofiltration) device. The method eliminates issues of thermal control of the oxidation, release of nitrogen into the atmosphere, and post-reaction difficulties in the removal of nitric acid and inorganic nitrates.

    摘要翻译: 使用使用氧和硝酸作为辅助氧化剂的受控硝酸方法将经受硝酸氧化的有机化合物氧化成其相应的羧酸。 通过该方法氧化一些碳水化合物可以产生一种或多种相应的酸形式。 该方法在中等温度下进行,通常在封闭反应器中在20℃至45℃的范围内,根据需要将氧气引入反应室,以维持反应。 计算机控制的反应器允许仔细和可重复地控制反应参数。 硝酸可以通过蒸馏/蒸发过程或通过扩散透析回收,水溶液用无机氢氧化物制成碱性,并且使用过滤(纳滤)装置除去残留的无机硝酸盐。 该方法消除了氧化的热控制,氮气释放到大气中的问题,以及去除硝酸和无机硝酸盐的后反应困难。

    Preparation of aromatic alkoxyalkanoic acids
    9.
    发明授权
    Preparation of aromatic alkoxyalkanoic acids 失效
    芳香族烷氧基烷酸的制备

    公开(公告)号:US5387712A

    公开(公告)日:1995-02-07

    申请号:US187360

    申请日:1994-01-26

    申请人: Herbert E. Fried

    发明人: Herbert E. Fried

    IPC分类号: C07C51/27 C07C51/16

    CPC分类号: C07C51/27

    摘要: A process for the preparation of an aromatic alkoxyalkanoic acid by reacting the corresponding aromatic alkoxyalkanol with a stable free radical nitroxide in the presence of a NO.sub.x -generating compound and an oxidant at a temperature in the range of from about 0.degree. C. to about 100.degree. C. and thereafter separating out the aromatic alkoxyalkanoic acid.

    摘要翻译: 在产生NO x的化合物和氧化剂的存在下,在约0℃至约100℃的温度范围内使相应的芳族烷氧基烷醇与稳定的自由基氮氧化物反应制备芳族烷氧基烷酸的方法 然后分离出芳族烷氧基烷酸。

    Preparation of alkoxyalkanoic acids
    10.
    发明授权
    Preparation of alkoxyalkanoic acids 失效
    烷氧基烷酸的制备

    公开(公告)号:US5250727A

    公开(公告)日:1993-10-05

    申请号:US996287

    申请日:1992-12-23

    申请人: Herbert E. Fried

    发明人: Herbert E. Fried

    CPC分类号: C07C51/27

    摘要: A process for preparing an alkoxyalkanoic acid by reacting the corresponding alkoxyalkanol with a stable free radical nitroxide in the presence of a NO.sub.x -generating compound and, optionally, an oxidant and/or a solvent, at a temperature in the range of from about 0.degree. C. to about 100.degree. C. and thereafter separating out the alkoxyalkanoic acid.

    摘要翻译: 在产生NO x的化合物和任选的氧化剂和/或溶剂的存在下,在约0℃的温度下使相应的烷氧基烷醇与稳定的自由基的氮氧化物反应制备烷氧基烷酸的方法 约100℃,然后分离出烷氧基链烷酸。