公开(公告)号：US20140155646A1

公开(公告)日：2014-06-05

申请号：US14090285

申请日：2013-11-26

Applicant: BASF SE

Inventor： Frank Mrzena ,  Hans-Juergen Kinder ,  Michael Schoenherr ,  Gerhard Cox ,  Thomas Schmidt ,  Volker Huett

IPC: C07C229/24

CPC classification number: C07C229/24 ,  C07B2200/13 ,  C07C227/42 ,  C07C229/16

Abstract: A process is proposed for the preparation of a powder comprising one or more derivatives of glycine-N,N-diacetic acid and/or one or more derivatives of glutamine-N,N-diacetic acid with a degree of crystallinity of a ≧30%, starting from an aqueous solution comprising the one or more derivatives of glycine-N,N-diacetic acid and/or the one or more derivatives of glutamine-N,N-diacetic acid in a concentration range from 20 to 60% by weight, based on the total weight of the aqueous solution, where the aqueous solution is concentrated in a first process step in an evaporator with rotating internals, which are arranged at a distance relative to the inside wall of the evaporator of ≦1% of the diameter of the evaporator, to give a crystal slurry with a solids concentration in the range from 60 to 85% by weight, based on the total weight of the crystal slurry, and where in a second process step the crystal slurry is left to ripen in a paste bunker and then in a thin-film contact dryer, and where the residence time in the paste bunker and in the thin-film contact dryer is in total a ≧15 minutes.

Abstract translation: 提出一种制备包含一种或多种甘氨酸-N，N-二乙酸衍生物和/或一种或多种结晶度为≥30％的谷氨酰胺-N，N-二乙酸衍生物的粉末的方法， 从包含甘氨酸-N，N-二乙酸的一种或多种衍生物和/或浓度为20至60重量％的谷氨酰胺-N，N-二乙酸的一种或多种衍生物的水溶液开始， 基于水溶液的总重量，其中在具有旋转内部件的蒸发器中的第一工艺步骤中浓缩水溶液，所述蒸发器相对于蒸发器的内壁设置一定距离; 1％的直径 ，得到基于晶体浆料的总重量的固体浓度为60至85重量％的晶体浆料，并且在第二工艺步骤中，将晶体浆料在 然后在薄膜接触式干燥机中， 其中在糊状掩模和薄膜接触式干燥器中的停留时间总共为≥15分钟。