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.
采用
氧气和
硝酸作为共同氧化剂的控制
硝酸工艺用于将有机化合物氧化成相应的
羧酸。该过程在适度的温度下进行,通常在20℃到45℃的范围内,在封闭反应器中进行,需要根据需要引入
氧气以维持反应。计算机控制的反应器可以对反应参数进行仔细和可重复的控制。
硝酸可以通过蒸馏/蒸发过程或通过扩散透析而得到回收,将
水溶液用无机氢氧化物碱化,然后使用过滤(纳滤)装置去除剩余的无机
硝酸盐。该方法消除了氧化反应的热控制问题,减少了氮排放到大气中的问题,以及后续处理中的
硝酸和无机
硝酸盐的去除困难。