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    • 5. 发明授权
    • Process for the recovery of adipic acid
    • 己二酸回收方法
    • US5264624A
    • 1993-11-23
    • US841958
    • 1992-02-26
    • Peter VogtelGeorg Steinhoff
    • Peter VogtelGeorg Steinhoff
    • C07C51/43C07C55/14C07C51/42
    • C07C51/43
    • This invention relates to a process for the recovery of adipic acid from mother liquors collected during commercial production of adipic acid, wherein said mother liquors contain from 52 to 60% by weight of nitric acid calculated as HNO.sub.3, not taking into account the organic constituents, from 2 to 6% by weight of succinic acid, from 4 to 9% by weight of glutaric acid, and from 5 to 10% by weight of adipic acid, by selective crystallization of the adipic acid dissolved in said mother liquors by(a) adding an aqueous adipic acid solution having an adipic acid content of from 0.5 to 6% by weight to said mother liquor in the temperature range of from 30.degree. to 60.degree. C. in such a quantity that the concentration of nitric acid in the mixture is reduced to 35 to 50% by weight;(b) cooling the mixture by at least 5 degrees Celsius within a period of from 0.5 to 5 hours to induce crystallization of the adipic acid;(c) isolating the crystallized adipic acid by filtration; and(d) transferring the filtrate obtained in step (c) to a distillation apparatus for distillative workup of the glutaric acid contained therein.
    • 本发明涉及从己二酸的商业生产过程中收集的母液中回收己二酸的方法,其中所述母液含有52至60重量%的以HNO 3计算的硝酸,不考虑有机成分, 通过(a)通过选择性结晶溶解在所述母液中的己二酸,将琥珀酸的重量计为2至6%,4至9%重量的戊二酸和5至10%重量的己二酸, 将己二酸含量为0.5〜6重量%的己二酸水溶液在30〜60℃的温度范围内加入到所述母液中,使得混合物中的硝酸浓度为 减少到35〜50重量% (b)在0.5至5小时的时间内将混合物冷却至少5摄氏度,以诱导己二酸的结晶; (c)通过过滤分离结晶的己二酸; 和(d)将步骤(c)中获得的滤液转移到其中所含的戊二酸的蒸馏处理用蒸馏装置中。