Patent ID: 8952156
Filing Date: 2015-02-10
Classification: B01D,C07C,C08G

Abstract:
1. A process for separating a reaction output which is obtained in the reaction of Ethylenediaminediacetonitrile (EDDN) or Ethylenediaminemonoacetonitrile (EDMN) with hydrogen in the presence of tetrahydrofuran(THF) and of a catalyst and which comprises Triethylenetetramine (TETA) or Diethylenetriamine (DETA) and water, with or without organic compounds having higher and lower boiling points than TETA or DETA, wherein i) the reaction output after removal of hydrogen is supplied to a distillation column DK1 in which a THF/water azeotrope is removed via the top and which may also comprise further organic compounds having a lower boiling point than TETA or DETA, and in which a bottom product comprising TETA or DETA is removed, and ii) passing the bottom product from stage i) into a distillation column DK2 and THF is removed via the top, and a stream comprising TETA or DETA is drawn off at the bottom of the column, and iii) the stream from stage i) drawn off at the top of column DK1 is condensed and an organic solvent which is essentially immiscible with water is fed into the condensate or a portion of the condensate in such an amount that phase separation occurs, and the mixture thus obtained is separated in a phase separator, the organic phase which forms, comprising THF and the organic solvent which is essentially immiscible with water, being recycled into column DK1 and the water phase being discharged.