公开(公告)号：US5587511A

公开(公告)日：1996-12-24

申请号：US556572

申请日：1995-11-13

申请人： Herbert Salzburg ,  Georg Steinhoff ,  Andreas Gosch ,  Gerd Hufen

发明人： Herbert Salzburg ,  Georg Steinhoff ,  Andreas Gosch ,  Gerd Hufen

IPC分类号： C07C51/43 ,  C07C51/47 ,  C07C51/48 ,  C07C55/12 ,  C07C55/14 ,  C07C51/00

CPC分类号： C07C51/43

摘要： The present invention relates to a process for obtaining adipic acid from the aqueous nitric acid mother liquors that arise during industrial adipic acid production by(i) removing nitric acid from the aqueous mother liquor by evaporation to a concentrate having a residual content of at most about 2.5 wt. % of HNO.sub.3,(ii) mixing the concentrate obtained according to step (i) with water or dilute aqueous nitric acid in a quantity corresponding to a weight ratio of solid to liquid of about 1:2.1 to about 1:1.2,(iii) allowing the water added in step (ii) or the nitric acid added in step (ii) to act upon the concentrate for at least about 10 minutes at about 20.degree. to about 80.degree. C., and(iv) separating adipic acid as crystals that are formed (1) during step (iii) at temperatures of no more than about 35.degree. C. or (2) after step (iii) by cooling the mixture from step (iii) to about 10.degree. to about 35.degree. C.

摘要翻译： 本发明涉及一种从工业己二酸生产过程中产生的硝酸母液中获得己二酸的方法，该方法是（i）通过蒸发从含水母液中除去硝酸至具有至多约 2.5重量％ ％的HNO 3，（ii）将根据步骤（i）获得的浓缩物与水或稀的硝酸水溶液混合，其量相当于固体与液体的重量比为约1：2.1至约1：1.2，（iii） 允许在步骤（ii）中加入的水或步骤（ii）中加入的硝酸在约20℃至约80℃下对浓缩物作用至少约10分钟，和（iv）将己二酸分离成晶体 在步骤（iii）中在不超过约35℃的温度下形成（1）或（2）在步骤（iii）之后通过将步骤（iii）的混合物冷却至约10℃至约35℃来形成（1）