VERFAHREN ZUR DESTILLATIVEN REINIGUNG VON EDA

    公开(公告)号:EP3116850A1

    公开(公告)日:2017-01-18

    申请号:EP15709173.7

    申请日:2015-03-11

    申请人: BASF SE

    摘要: The invention relates to a method for the distillative purification of ethylenediamine (EDA), having the steps a) and b). In step a) a mixture (G1) containing water, EDA, and N-methyl ethylenediamine (N-MeEDA) is supplied into a distillation device (D1) from which the main quantity of the water contained in the mixture (G1) is separated via the head at a pressure of more than 4.8 barA. The water-depleted mixture (G2) is supplied from the sump of (D1) to a distillation device (D2) in step b), and the main quantity of N-MeEDA is distilled out via the head of (D2). The stream S3 obtained from the sump of (D2) contains EDA. The components of water and N-MeEDA contained in the mixture (G1) are largely or completely depleted. Optionally, additional distillation steps can be carried out in order to obtain pure EDA if additional diethylenetriamine (DETA) is contained in the mixture (G1) for example. As long as additional ammonia is contained in the mixture (G1), an ammonia separation process is additionally carried out in the method according to the invention preferably prior to carrying out step a).

    摘要翻译: 本发明涉及具有步骤a)和b)的乙二胺(EDA)蒸馏提纯方法。 在步骤a)中,将含有水,EDA和N-甲基乙二胺(N-MeEDA)的混合物(G1)供给到蒸馏装置(D1)中,混合物(G1)中所含的主要水分离 通过头部压力超过4.8巴。 在步骤b)中,从(D1)的贮槽向蒸馏装置(D2)供给贫水混合物(G2),通过(D2)的头蒸馏出主要量的N-MeEDA。 从(D2)的贮槽获得的流S3包含EDA。 包含在混合物(G1)中的水和N-MeEDA的组分大部分或完全耗尽。 任选地,如果在混合物(G1)中包含另外的二亚乙基三胺(DETA),则可以进行额外的蒸馏步骤以获得纯EDA。 只要混合物(G1)中含有另外的氨,在本发明的方法中,优选在进行步骤a)之前,另外进行氨分离处理。